ITEM 3.1_attach 2DARKENWALD CORPORATION
4
DARKENWALD
C O R P O R A T I O N
OTSEGO, MINNESOTA
PLANNED UNIT DEVELOPMENT
(PUD) CONCEPT PLAN AMENDMENT
RIVERBEND NORTH
May 23, 2017
Project Narrative
L A N D F O R M
From Site to Finish
INTRODUCTION
On behalf of Darkenwald Corporation, Landform is pleased to submit this application for an amendment
to the PUD Zoning District and Concept Plan for the Riverbend North Project. The 13.1 -acre site is
located at the southeast quadrant of TH 101 and CSAH 42 (River Road.) The new PUD Concept Plan,
as did the previous plan, shows a mixture of apartments and commercial uses for the site. We are excited
about the improvements proposed for this site.
The primary existing use on the site is mini -storage, outside storage, and a private wastewater treatment
facility (WWTF) serving the Riverbend Mobile Home Park, located to the south of the site. In the past,
ponds associated with the WWTF were located in the northern portion of the site. They were removed.
The southwest portion of the site includes an open storage area used primarily by residents of the mobile
home park.
BACKGROUND, 2014 PUD
In 2014, the City of Otsego approved a Zoning Map Amendment rezoning the site from B-3 District to
PUD District. (See Exhibit 1, Ordinance 2014-11, adopted September 22, 2014.) The PUD Concept Plan
considered in the application showed two commercial sites in the northern part of the site abutting River
Road (2.20 acres and 2.45 acres) and two sites for apartments and storage (3.70 and 4.00 acres) on the
remainder of the property. The concept plan did not specify the intensity (number of units, density or
square feet) of the proposed uses. The plan shows a new private drive with a full access intersection on
River Road, connecting through the property to the Riverbend Mobile Home Park to the south. Another
right -in, right -out access point was shown to the north of the intersection on River Road, to allow a
secondary access to the northern commercial site. The plan also showed a private road access to the site
through the Riverbend Mobile Home Park near the Park's entrance on River Road.
Otsego's Comprehensive Plan designated this site for commercial land uses in 2004, in anticipation of the
site having access and visibility from TH 101 at the intersection with CSAH 42 (River Road.) Since then,
TH 101 was improved to freeway status and the interchange with CSAH 42 (River Road) was built.
Grades were altered so that TH 101 is substantially higher in elevation than the site, and a sound wall
was constructed along the east side of the road. The sound wall partially obscures visibility of this site
from TH 101, particularly for north bound traffic. In approving the 2014 PUD, the City found that the
changes in conditions warranted consideration of allowing multiple family dwelling units as part of the
development. The proposed residential uses would be the least visible from TH 101, would create a
desirable transition between the existing Riverbend Mobile Home Park and planned commercial uses,
and would also provide market support for the commercial uses.
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Project Narrative 2
Since the 2014 PUD approval, the owner has continued to evaluate the best use of the site. There was an
existing ponding area at the southeast corner of the site that required further study. The pond was found
to be man-made. A wetland evaluation for the entire site found no wetlands requiring preservation.
To meet lender requirements, the owner found it necessary to separate the WWTF from the Riverbend
Mobile Home Park property. In 2017, a Common Interest Community (CIC) plat was recorded with Wright
County. (See Exhibit 2, attached.) (This type of property division is commonly used for condominium
developments.) The CIC plat shows a common private driveway through the central portion of the site,
with three separate parcels, one of which (Unit 1) includes the WWTF. The common drive extends to the
mobile home park parcel, to preserve the option for a future connection. The Riverbend North site is in
separate ownership from the parcel to the south, which includes the Riverbend Mobile Home Park and
the existing office building.
BACKGROUND, WASTEWATER TREATMENT FACILITY (WWTF)
The existing WWTF facility on the site was built in 1972 to serve the Riverbend Mobile Home Park as well
as future development of the adjoining property. It is an extended aeration package plant with aerobic
digestion, chlorine disinfection, and dechlorination. The design maximum flow capacity is 90,000 gpd
(gallons per day). It is permitted by the Minnesota Pollution Control Agency (MPCA) to discharge 60,000
gpd on a calendar month average. Average daily flow is approximately 20,000 gpd with a maximum daily
flow of approximately 31,000 gpd. With the addition of approximately 170 apartments and the proposed
mini -storage facility, average daily flow would increase to approximately 37,000 gpd. The MPCA permit is
reissued every five years, most recently in 2016. In 2015, the facility received a certificate of
commendation for compliance with its discharge permit.
The owner commissioned a study of the WWTP to determine the best options for continued sewer service
to the Riverbend Mobile Home Park and extending service to the proposed new development on the
Riverbend North site. The report from Donohue & Associates, Inc. (Exhibit 5, attached) evaluates the
following options: 1) Using the existing WWTP as is to serve Riverbend and the proposed development;
2) upgrading and extending the useful life of the existing WWTP to accommodate the proposed flows and
loadings; 3) constructing a new WWTP for the same purpose; or 4) connecting to the City of Otsego
sanitary sewer system. The analysis concluded that the owner should use the existing WWTP as is, and
rehabilitate it over the next 5-15 years.
On April 24, 2017, the City Otsego adopted Ordinance 2017-05, Amending the Zoning Ordinance to
Establish Provisions Related to Waste Water Treatment Facilities. The ordinance amends Section 20-90
of the Zoning Ordinance, the INS, Institutional District, to list "Waste Water Treatment Facilities permitted
by the Minnesota Pollution Control Agency" as allowed by Conditional Use Permit (CUP). The ordinance
established several criteria for CUPs, including a minimum 75 -foot setback from property lines and public
DAC16001 L A N D F O R M May 23, 2017
Project Narrative 3
rights-of-way, screening, fencing and a 15 -acre minimum lot size. The ordinance applies to municipal
waste water treatment facilities and one privately -owned facility, the existing Riverbend WWTF. The
owner was informed of the new ordinance after it was adopted.
The existing WWTF is not listed as an allowed use in the 2014 PUD District, and does not meet many of
the criteria in the new 2017 ordinance. City staff has indicated that the ordinance makes the existing
WWTF a legal non -conforming use. Per Section 20-15 of the Otsego Zoning Ordinance, the facility may
continue as it exists. A non -conforming structure or use lawfully existing when the ordinance was adopted
may not be enlarged or reconstructed, but may be continued at the size and in the manner of operation.
Normal maintenance, repairs and incidental alterations which do not physically extend or intensify the
non -conforming use or structure are permitted.
CONCEPT PLAN
Exhibit 4, attached is the Proposed PUD Concept Plan, which would replace the plan reviewed and
approved by the City in 2014.
Land Uses
The concept plan includes the following uses:
Riverbend North PUD Concept Plan
Apartments
Building Footprint
54,000 sq. ft.
Units
192
Parking Stalls
Surface Stalls
397
Garage Stalls
48
Tuck -Under Stalls
47
Total Parking Stalls
492
Mini -Storage
Building Footprint
31,400 sq. ft.
Units
97
Existing Wastewater Treatment Facility
3,000 sq. ft.
Retail (FUTURE)
Building Footprint
5,000 sq. ft.
A comparison with the 2014 PUD Concept Plan is not possible, as the plan did not include information
about the intensity of the proposed land uses.
The apartment building occupies approximately the western half of the site. The apartments are designed
so that they could be built in two phases. Parking is provided with a combination of surface stalls, free-
standing garage stalls, and tuck -under stalls on the first level of the building.
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Project Narrative 4
The plan show a mini -storage facility in the area adjacent to River Road. Storage units would be rented to
occupants of the adjacent mobile home park and of the future apartments, and potentially to other
community residents. This requires an amendment to the 2014 PUD District text, which specifies self -
storage as an allowable use "accessory to uses within the PUD District and abutting Riverbend Mobile
Home Park." We note that the identity of storage -unit renters is not material to the potential land use
impacts of the facility and that enforcement would be difficult. The restriction places an unreasonable
burden on the successful operation and financing of this part of the project.
Because of the large supply of commercial land in the Highway 101 corridor, the isolation of this site from
other commercial locations, and its lack of visibility from Highway 101, it is not now a prime location for
office or retail uses. The mini -storage facility is a low -intensity commercial use that will be compatible
with, and provide a service that will be utilized by, the surrounding residential uses. If and when the
market warrants, perhaps in 20 to 30 years, the mini -storage could be redeveloped for a more intense
commercial use.
The existing WWTF facility would be flanked by and screened by the mini -storage buildings. The WWTF
is completely contained within the existing structure. Access and any parking needed for service vehicles
would be accommodated within the mini -storage facility.
Lastly, the plan shows the building footprint for a future commercial site at the north end of the project. If
the market supports it, this 5,000 sq. ft. structure could house convenience retail uses to serve the
surrounding residential area.
Roadway Access
The concept plan shows all uses taking access from a private drive from River Road, at the same location
shown on the 2014 plan. The only exception is a right -in, right -out driveway shown at the north end of the
retail site, which was also included in the 2014 plan. The private drive, and some of the parking spaces,
would be located in the CIC common area parcel, which extends to the boundary of the Riverbend Mobile
Home Park property. No access would be provided to the Riverbend Mobile Home Park, although the
concept sketch shows how it could be connected in the future.
The owner requested an evaluation from Spack Consulting concerning the potential traffic impacts of the
revised PUD Concept Plan. (Please see Exhibit 6, Forecasted Trip Generation Table and Traffic Signal
Warrant Analysis, attached.) The apartments and mini -storage uses shown on the plan would generate
approximately 1,358 new local trips, including 97 new trips in the AM peak hour and 126 new trips in the
PM peak hour. The proposed private drive will be adequate for these traffic volumes. The intersection
with River Road will not meet warrants for a traffic signal and should function well with a stop sign on the
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Project Narrative 5
private drive. It is understood that a full traffic study will be required when a PUD Development Stage
Plan is submitted.
Utilities
The existing wastewater treatment facility (WWTF) has sufficient capacity to serve the proposed
Riverbend North project, without any physical changes to the plant. Private service lines will be
constructed within the site, in easements meeting city requirements. The equipment upgrades needed in
the next 5 to 15 years recommended in the Donohue report would be contained within the existing
structure. With this application, we request that the existing WWTP be listed as an allowed use in the
PUD Zoning District as long as it continues to be permitted by the MPCA.
The City has indicated its desire that all new development connect to the City's public wastewater
treatment system, and that the private WWTF eventually be phased out. The Donohue study found that
continued use of the existing WWTF is the preferred alternative, after comparing capital and operation
costs with the cost of connecting to the City system. The alternatives were evaluated based on 2017
dollars and rates. Should the owner and the City negotiate the rates, or identify an alternative source of
financing for the cost of connecting to the City system, this evaluation could change. One possible
source of financing is Tax Increment Financing (TIF.) In May 2015, the City received a preliminary report
from its public finance consultants (Ehlers) indicating that a Housing TIF district could be used to assist
with development costs (including utilities) for an apartment project on this site.
We propose that the new uses connect to the City of Otsego public water supply. While the City has a
requirement that users of its water system also connect to the public wastewater system, we propose an
exception be made, the same as when the Riverbend Mobile Home Park was connected to the city water
system.
CRITERIA FOR ZONING AMENDMENTS
Section 20-3-21 of the Otsego Zoning Ordinance requires that the Planning Commission and City
Council consider the following criteria when evaluating proposed amendments. Our response to each of
the criteria follows each item:
1. The proposed action's consistency with the specific policies and provisions of the Otsego
Comprehensive Plan.
The City made the following finding when approving the PUD zoning district:
The Comprehensive Plan includes the policy to cluster complementary land uses and activities
into functionally related sub -units of the community as determined by physical barriers,
homogenous land use characteristics and service area boundaries. The proposed master plan for
the subject site reflects the physical characteristics of the site relative to TH 101 and CSAH 42,
provides in-place residential support for planned commercial uses and provides a desirable land
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Project Narrative 6
use transition from Riverbend Mobile Home Park. The proposed PUD District is therefore
consistent with the provisions of the Comprehensive Plan.
As noted in 2014, the site has physical barriers to visibility from TH101. Visibility to traffic using the
CSAH 42 interchange is also poor, due to the curvature of the road. This site is isolated from the
other planned and existing commercial uses in the TH101 corridor. The large supply of more
desirable commercial sites in the corridor suggests that the demand for high intensity retail or office
uses for this site may be limited. The commercial uses proposed by the PUD concept plan (mini
storage and a future retail building) would offer goods and services for the residents of the existing
residential uses in the immediate area.
2. The proposed use's compatibility with present and future land uses of the area.
The City made the following finding when approving the PUD zoning district:
The subject site abuts the Riverbend Mobile Home Park to the south and is separated from
existing two and one-half acre single family lots to the east by CSAH 42. The uses anticipated by
the proposed master plan will be compatible with present and future land uses in the area.
In addition to the transitions described above, we note that the layout of uses within in the PUD (low-
rise buildings adjacent to River Road, and the taller apartment buildings nearer TH101) contributes to
good transitions to the adjacent mobile home park to the south and the single family residential uses
to the east. Within the PUD, the mini -storage use is compatible with retention of the existing
wastewater treatment facility (WWTF). The mini -storage structures would screen the WWTF building.
While there have been no nuisance complaints arising from the WWTF, the mini -storage facility will
be a very compatible use because it is unoccupied most of the time.
3. The proposed use's conformity with all performance standards contained within the Zoning
Ordinance and other provisions of the City Code.
The City made the following finding when approving the PUD zoning district:
Development of the subject site will require future applications for PUD Development Stage Plan,
preliminary plat and final plat approval and compliance with the requirements of the Zoning
Ordinance and Subdivision Ordinance.
A future application for PUD Development Stage approval is expected. Because no land division is
anticipated, platting may not be necessary. PUD flexibility will be needed to allow for the presence of
the non -conforming WWTF structure. Such flexibility is appropriate in this case. The recent ordinance
changes appear to include setbacks and other standards suitable for large-scale WWTF (where
capacity can be measured in millions of gallons per day) but not for this small-scale, 60,000 -gallon
per day facility with no history of nuisance odor complaints.
4. Traffic generation of the proposed use in relation to capabilities of streets serving the
property.
The City made the following finding when approving the PUD zoning district:
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Project Narrative 7
The subject site is accessed via CSAH 42, which is designated as a minor arterial roadway by the
Transportation Plan and Northeast Wright County Transportation Plan. CSAH 42 has adequate
design capacity to accommodate traffic generated by the land uses shown on the master plan.
The preliminary estimate of traffic impacts of the revised PUD Concept Plan indicates that the
proposed private drive will be adequate for the projected traffic volumes. The intersection with River
Road will not meet warrants for a traffic signal and should function well with a stop sign on the private
drive. It is understood that a full traffic study will be required when a PUD Development Stage Plan is
submitted.
5. The proposed use can be accommodated by existing public services and facilities and will not
overburden the City's service capacity.
The City made the following finding when approving the PUD zoning district:
The subject site is within the East Sewer District where the City anticipates development of urban
land uses connected to municipal utilities and provided needed municipal services. The City has
existing public services and facilities needed to serve the land uses planned by the master plan.
Adequate public services and facilities are available. We propose to lessen the burden on public
wastewater facilities by utilizing the capacity available in the existing WWTF.
SUMMARY
We respectfully request approval of an Amendment to Ordinance 2014-11 Establishing a PUD, Planned
Unit Development District for Riverbend North, specifically:
• Revise Section 4. Sub -districts, to permit self -storage facilities as an allowed Commercial use in
the PUD District, removing the restriction that they are permitted only as accessory to residential
uses;
• Revise Section 4, Sub -districts, to allow existing wastewater treatment facilities permitted by the
MPCA as an allowed Commercial use within the PUD District; and
• Delete Section 9. Utilities, which requires that all development in the PUD to be connected to
municipal sanitary sewer and water, which would allow the use of the existing WWTF.
We also request approval of the revised PUD Concept Plan for Riverbend North, and look forward to
submitting a Development Stage PUD Application for the project.
CONTACT INFORMATION
This document was prepared by:
Anne Hurlburt, Planning Lead
Landform
105 South Fifth Street, Suite 513
Minneapolis, MN 55401
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Project Narrative 8
Any additional questions regarding this application can be directed to Darren Lazan at
dlazanCo)landform.net or 612-638-0250.
Exhibits:
1. Ordinance 2014-11/ 2014 PUD Concept Plan
2. CIC Plat, Riverbend North
3. Existing Conditions Exhibit
4. Concept Plan Exhibit
5. Wastewater Treatment Plan Evaluation, Donohue & Associates, Inc.
6. Forecasted Trip Generation and Traffic Signal Warrant Analysis
DAC16001 L A N D F O R M May 23, 2017
Project Narrative 9
Exhibit 1
ORDINANCE NO.: 201411
CITY OF OTSEGO
WRIGHT COUNTY, MINNESOTA
AN ORDINANCE ESTABLISHING A PUD, PLANNED UNIT DEVELOPMENT
DISTRICT FOR RIVERBEND NORTH.
THE CITY COUNCIL OF THE CITY OF OTSEGO HEREBY ORDAINS:
Section 1. Legal Description. The legal description of the property
included in the PUD District shall be as follows:
INSERT LEGAL DESCRIPTION
Section 2. Zoning Map Amendment. The property is hereby rezoned
from B-3, General Business District to PUD, Planned Unit Development District
subject to the terms and conditions set forth herein.
Section 3. Riverbend North Planned Unit Development District.
Any allowed uses and standards not specifically addressed by the Riverbend
North Planned Unit Development District shall be subject to the requirements set
forth by the Otsego Zoning Ordinance understanding that subsequent, more
specifically detailed, PUD Development Stage Plans may seek modification of
the standards and requirements established by the Zoning Ordinance by City
Council approval provided that the proposed flexibility is shown to be consistent
with the goals and objectives of the City of Otsego Comprehensive Plan and
complies with the fundamental principals for the requirements established by the
Zoning Ordinance, even without their strict application.
Section 4. Sub -districts. For the purposes of this PUD District, the
following sub -districts shall be established with their boundaries generally
following the Master Plan attached as Exhibit A:
A. Commercial
B. High Density
. Section 5. Allowed Uses. The allowed uses within this PUD District
shall include the following base entitlements:
1
PUD Concept Plan Amendment Riverbend North 1 May 23, 2017
DAC16001
Exhibit 1
A. Commercial. All permitted uses, permitted accessory uses,
conditional uses, interim uses and uses allowed by administrative
permit within the B-3 District shall be allowed within this sub -district
subject to approval of a Development Stage Plan in accordance
with the Zoning Ordinance.
B. High Density. All permitted uses, permitted accessory uses,
conditional uses, interim uses and uses allowed by administrative
permit within the R-7 District shall be allowed within this sub -district
subject to approval of a Development Stage Plan in accordance
with the Zoning Ordinance and also:
1. Self -storage facilities accessory to uses within the PUD
District and abutting Riverbend Mobile Home Park.
Section 6. Lot Requirements. Lot requirements for the various sub -
districts of this PUD District shall be as established follows:
A. Commercial. All lot requirements and setbacks required within
the B-3 District shall be applicable within this sub -district unless
modified by approval of a Development Stage Plan in accordance
( with the Zoning Ordinance.
B. High Density. All lot requirements and setbacks required within
the R-7 District shall be applicable within this sub -district unless
modified by approval of a Development Stage Plan in accordance
with the Zoning Ordinance,
Section 7. Construction Standards. The construction of structures
within this PUD District shall conform to the requirements of the Zoning
Ordinance, unless modified by approval of a Development Stage Plan in
accordance with the Zoning Ordinance,
Section 8. Off -Street Parking and Loading. Off-street parking and
loading areas required by the Zoning Ordinance shall conform to the
requirements of the Zoning Ordinance, unless modified by approval of a
Development Stage Plan in accordance with the Zoning Ordinance.
Section 9. Utilities. All development within this PUD District shall be
connected to municipal sanitary sewer and water utilities in accordance with
Chapter 6, Section 1 of the City Code.
2
PUD Concept Plan Amendment Riverbend North 2 May 23, 2017
DAC16001
Exhibit 1
Section 10. Future Phases and Amendments. Approval of PUD
Development Stage Plans, modifications of the performance standards
established by this PUD District and the inclusion of additional lands within this
PUD District shall be processed in accordance with requirements of the Zoning
Ordinance.
Section 11. The Zoning Map of the City of Otsego shall not be
republished to show the aforesaid amendment, but the City Clerk shall
appropriately mark the zoning map on file in the City Clerk's office for the
purpose of indicating the rezoning hereinabove provided for in this Ordinance,
and all of the notations, references and other information shown thereon are
hereby incorporated by reference and made part of this Ordinance.
Section 11. This Ordinance shall be effective upon its passage and
publication in accordance with State Statute.
ADOPTED by the City Council of the City of Otsego this aD- day of
September, 2014.
CITY OF OTSEGO
BY:
J sica L. Stockamp, Mayor
ATTEST
BY: �,'h—
Tami Loff, City Clerk
3
PUD Concept Plan Amendment Riverbend North 3 May 23, 2017
DAC16001
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Technical Memorandum No. 1
DARKENWALD CORPORATION
WASTEWATER TREATMENT PLANT
EVALUATION D D O N O H U E
Date: May 22, 2017
To: Darkenwald Corporation
Copy: Dennis Martenson, Donohue & Associates, Inc.; Paul Christensen, People Service Inc.
From: Tim Korby, Donohue & Associates, Inc.
Re: Wastewater Treatment Plant Evaluation
Project Description
Darkenwald Corporation (Owner) currently owns and operates a 90,000 gpd wastewater treatment plant
(WWTP) that serves approximately 200 mobile home units within the Riverbend Community located in
Otsego, Minnesota. The average daily flow is approximately 20,000 gpd with a maximum daily flow of
approximately 31,000 gpd. The Owner is proposing to add an additional 170 apartment units to the west
end of the Riverbend property and treat the wastewater under their existing NPDES permit. The purpose
of this memo is to perform an economic and non -economic evaluation of options for wastewater
treatment including: 1) do nothing ; 2) upgrading and extending the useful life of the existing WWTP to
accommodate the proposed flows and loadings; 3) constructing a new WWTP forthe same purpose; or4)
connecting to the City of Otsego sanitary sewer system.
n � u
Riverbend WWTP
� AlbMville ,
OPremliirn Wllefs
M-l'e irp
91
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Figure 1— Project Location
Wastewater Treatment Plant Evaluation Technical Memorandum No. 1
Darkenwald Corporation May 23, 2017
Existing Conditions
The current WWTP was constructed in 1972 and is an extended aeration package plant with aerobic
digestion, chlorine disinfection, and dechlorination. The system has been capable of treating the current
flows and loading and meeting the NPDES permit limits as summarized in Table 1. The 2016 NPDES Permit
issued by the Minnesota Pollution Control Agency is included as Attachment A to this report. The design
maximum flow capacity of the existing WWTP is 90,000 gpd, based on original specifications included in
Attachment B. The WWTP is permitted to discharge 60,000 gpd on a calendar month average. Sludge
from the aerobic digester is pumped and hauled from the facility on a monthly basis and operation and
maintenance activities are contracted out to a private company. Effluent from the facility passes through
a dechlorination basin and is discharged through a 10 -inch gravity pipe that expands to a 24 -inch gravity
pipe that discharges to the Upper Mississippi River. The drainage easement of the WWTP discharge is
documented in Attachment C. A summary of the Discharge Monitoring Report data from 2014 to 2016 is
included in Attachment D. It is also useful to note that there are no MPCA setback restrictions from the
WWTP to the existing or proposed development.
Table 1— Existing WWTP Performance
Parameter Influent
cBOD 312 mg/I
Effluent
6.8 mg/I
(Permit Requirement)
(25 mg/I, monthly avg)
Total Phosphorus 10.5 mg/I
6.0 mg/I*
(290 kg/yr, 12 -mo avg)
Fecal Coliform N/A
<200 MPN
(200 MPN, monthly avg)
TSS 320 mg/I
6.0 mg/I
(30 mg/l, monthly avg)
*166 kg/yr
The WWTP has several major components needing replacement or rehabilitation in the next 10 to 15
years. Components of the existing WWTP that have been recently replaced include one blower and the
addition of a dechlorination basin.
Proposed Conditions
With the proposed development of 170 apartment units to be served by the existing WWTP, the future
average daily flow is expected to increase to 37,000 gpd, with peak daily flows of approximately 89,000
gpd. The influent wastewater would be consistent with typical residential and light commercial
wastewater characteristics and current conditions. It is expected that the current WWTP would be able
to meet the NPDES permit requirements under the proposed condition, but may require some
phosphorus removal technology to meet the new total phosphorus effluent mass limit summarized in the
2016 permit. For the purposes of this memo, the cost for additional phosphorus removal will not be
included in the alternatives analysis.
Furthermore, additional detail on the wastewater contributions from the final development, including any
proposed commercial development to meet the desire of the city of Otsego for such development, would
be required. This information would be used during the final design and implementation of any alternative
to determine the capability of the existing WWTP to handle the total proposed flow and wastewater
composition and to determine if any pre-treatment of wastewater discharged may be required to
accommodate any significant users.
Donohue Project No.: 13230 2 Donohue & Associates, Inc.
Wastewater Treatment Plant Evaluation Technical Memorandum No. 1
Darkenwald Corporation May 23, 2017
Alternative Analysis
The following sections summarize each alternative and the associated estimated costs.
Do Nothing
Based on the specifications of the existing WWTP, review of the current NPDES permit, and historical plant
performance, the existing WWTP is suitable to treat the proposed wastewater flow and loading at this
time. Existing equipment that we believe will require replacement in the next 5 to 10 years includes the
comminutor, one blower, and six 3 -inch RAS/WAS valves. These minimal improvements will allow for
improved plant performance and reduced operational expenses and are typical for any wastewater
treatment plant.
Rehabilitate Existing WWTP
The existing WWTP has been in service for 45 years. It is anticipated that much of the current equipment
and infrastructure will require replacement or rehabilitation over the next 10 to 15 years to extend the
service life of the facility. However, the existing facility has performed extremely well and has sufficient
design capacity to accommodate the proposed conditions. In order to extend the useful life of the facility
for an additional 40 years, the following upgrades are recommended:
• Line the existing steel tanks with a corrosion barrier
• Replace the comminutor
• Replace the blowers
• Replace six 3 -inch RAS/WAS valves
• Upgrade the disinfection method from chlorination to ultraviolet (UV) disinfection
• Provide water service to the WWTP for lab space and maintenance purposes
• Provide a concrete floor in the WWTP to improve maintenance access
• Upgrade lighting to improve maintenance and operation safety (optional)
As previously stated, the facility may require additional treatment to improve phosphorus removal.
Chemical removal of phosphorus would be the proposed method of additional treatment, if needed, and
provide the lowest capital cost compared to filtration.
The costs for rehabilitating the existing WWTP to accommodate the proposed conditions and extend the
service life of the existing facility are summarized in Table 2.
Table 2 — Rehabilitate Existing WWTP: Summary of Estimated Costs
Component Ei
Tank Lining
•
105,000
..
40 years
Comminutor
45,000
20 years
Blowers
75,000
20 Years
Misc. Valves
10,000
20 Years
UV Disinfection
30,000
20 Years
Water Service
5,000
40 Years
Misc. Building Improvements
25,000
40 Years
Temporary Bypass/Hauling
50,000
N/A
Donohue Project No.: 13230 3 Donohue & Associates, Inc.
Wastewater Treatment Plant Evaluation Technical Memorandum No. 1
Darkenwald Corporation May 23, 2017
During rehabilitation of the existing WWTP, wastewater will need to bypass various stages of treatment
to accommodate tank lining or be hauled to another WWTP for processing. A detailed cost estimate
breakdown for these improvements is included in Appendix 1. The total estimated cost for rehabilitating
the existing WWTP is $579,600.
Replace Existing WWTP with New Package Plant
Given the proposed future flows and loadings, along with the success of the current package plant at
providing exceptional wastewater treatment, similar package plants were evaluated for replacement of
the existing facility. Based on the most comprehensive and cost-effective proposal, the proposed new
package plant would provide an in-line comminutor, aeration chamber, clarifier, aerobic digester/sludge
holding chamber, UV disinfection, corrosion prevention, and controls. Additional work not included in
the package plant proposal would include electrical connections, plumbing, foundations, lighting, and site
work. A preliminary cost proposal for completing the site work and installation of a comparable package
plant was obtained from a reputable and licensed contractor as part of this evaluation. Detailed proposals
and cost estimates for the package plant and site work are included in Attachments E and F, respectively.
The new package plant would utilize the existing drainage easement and discharge point and operate
under a similar discharge permit as revised under MPCA requirements.
The costs for replacing the existing WWTP with a new package plant that will accommodate the proposed
conditions and provide 40 years of service life are summarized in Table 3.
Table 3 — New Package Plant: Summary of Estimated Costs
A detailed cost estimate breakdown for these improvements is included in Appendix 2. The total
estimated cost for a new package plant is $868,560.
Connect to City of Otsego Sanitary Sewer
Another option to dispose of the wastewater generated from the Riverbend Community and proposed
expansion is to discharge it to the City of Otsego sanitary sewer. This option was evaluated on an
economic basis in a draft report prepared by AE2S dated October 5, 2016 under the direction of the City
and is included as Attachment G. The AE2S report estimates the cost to connect to the Otsego sanitary
sewer based on the total flow compared to a Residential Equivalent Connections (REC) factor. Based on
the projected average daily flow of the proposed conditions and the REC factor cited in the AE2S report,
the revised calculated connection cost is $1,956,138, as summarized in Table 4.
Table 4 — Revised City Connection Cost Example
Donohue Project No.: 13230 4 Donohue & Associates, Inc.
Wastewater Treatment Plant Evaluation Technical Memorandum No. 1
Darkenwald Corporation May 23, 2017
Similarly, the revised annual wastewater treatment cost is estimated to be $79,455.93, as summarized in
Table 5. Note that the rates and fee structures cited may not be current, but are offered as a comparison
to the figures cited in the AE2S report.
Table 5 — Revised City Wastewater Treatment Cost Example
Operation & Maintenance Expenses
The complete operation and maintenance expenses of the existing facility, including biosolids handling
and disposal, is included in Attachment H. The total annual O&M expenses for the existing facility is
approximately $75,000. Given the proposed flows and loading, the only operation and maintenance
activities that would expect a significant cost increase are biosolids handling and disposal and electrical
costs. In contrast, given the updates to the existing facility or a new package facility, it may be expected
that some O&M expenses are reduced due to newer equipment, improved performance, and ease of
operation. Based on a conservative assumption of a 40% increase in overall O&M expenses, the projected
annual O&M expenses under the proposed conditions for either a rehabilitated existing facility or a new
package plant may be approximately $105,000.
It is also recommended that the Owner considerthe need for a replacement fund to rehabilitate or replace
equipment that does not typically have a service life of 40 years. Based on the summary in Table 2, this
would require approximately $160,000 saved over 40 years, or $4,000 per year. Adding this to the annual
0&M expenses results in an annual operational cost of $109,000.
Summary & Recommendation
Based on the alternatives evaluated, available information, and assumptions, it is recommended that the
Owner pursue the option of "Do Nothing' to accommodate the proposed conditions since it represents
the lowest cost option. This option represents typical 0&M costs for a facility of this age, but given the
exceptional performance of the WWTP to date, there is no immediate need for significant upgrades or
modification of the existing unit processes.
Acknowledging that the current WWTP will require more significant rehabilitation to achieve an additional
40 years of service life at some point in the future, Table 6 summarizes the comparison of rehabilitating
the existing WWTP and connecting to the City of Otsego sanitary sewer. Rehabilitating the existing WWTP
is summarized as the capital construction cost plus the annual 0&M and replacement fund expenditures.
Connection to the City is summarized as a one-time connection fee plus annual sanitary utility billing. The
simple payback period for connection to the City is 46.6 years, or 6.6 years greater than the projected
service life of the rehabilitated WWTP.
Note that all alternatives have been evaluated based on 2017 dollars and rates, with no assumptions for
inflation, future energy prices, labor costs, or biosolids collection or disposal fees. This analysis does not
account for any additional expansion of the Riverbend Community beyond the proposed 170 additional
residential units and City rates and charges are based on those cited by AE2S.
Donohue Project No.: 13230 5 Donohue & Associates, Inc.
Wastewater Treatment Plant Evaluation Technical Memorandum No. 1
Darkenwald Corporation May 23, 2017
Table 6 — Alternative Analysis Comparison Summary
Description Rehab Existing WWTP Connect to City Difference
Capital Cost $579,600 $1,956,138 $1,376,538
Annual Operational Cost $109,000 $79,456 -$29,544
Payback Period, Years 46.6
Appendices
Appendix 1— Rehabilitation of Existing WWTP, Cost Estimate Breakdown
Appendix 2 — New Package Plant, Cost Estimate Breakdown
Attachments
A-2016 NPDES Permit
B — Existing WWTP Specifications
C— Existing Drainage Easement
D — Existing WWTP DMR Data, 2014-2017
E — New Package Plant Equipment Proposal
F — New Package Plant Site Work & Installation Proposal
G — AE2S Report: October 5, 2016
H — Existing WWTP Annual 0&M Expense Summary
Donohue Project No.: 13230 6 Donohue & Associates, Inc.
Appendix 1
Rehabilitation of Existing WWTP
Item 2017$
Tank Lining
$
105,000
Comminutor
$
45,000
Blowers
$
75,000
Misc. Valves
$
10,000
UV Disinfection
$
30,000
Water Service
$
5,000
Misc. Building Improvements
$
25,000
Temporary Bypass/Hauling
$
50,000
Subtotal $ 345,000
Mobilization, Bonds, Insurance (5%) $ 17,250
Contingency (15%) $ 51,750
Engineering, CRS (25%) $ 103,500
Legal, Administration (15%) $ 62,100
Total $ 579,600
Appendix 2
New Package Plant
Item 2017$
Site Work, Utilities, Installation $ 190,000
Equipment $ 327,000
Subtotal $ 517,000
Mobilization, Bonds, Insurance (5%) $ 25,850
Contingency (15%) $ 77,550
Engineering, CRS (25%) $ 155,100
Legal, Administration (15%) $ 93,060
Total $ 868,560
Attachment A
March 1, 2016
Minnesota Pollution Control Agency
Detroit Lakes Office 1714 Lake Avenue I Suite 220 I Detroit Lakes, MN 56501 1218-847-1519
800-657-3864 1 Use your preferred relay service I info.pca@state.mn.us I Equal Opportunity Employer
Mr. John Darkenwald, President
Darkenwald's Riverbend Wastewater Co. LLC
7535 Northeast River Road
Otsego, MN 55330
RE: Final NPDES/SDS Permit Number MN0042251
Riverbend Mobile Home Park Wastewater Treatment Facility
T121N, R23W, 526, Otsego, Wright County, Minnesota
Dear Mr. Darkenwald:
Enclosed is the final permit for the facility identified above. The Minnesota Pollution Control Agency
(MPCA) has prepared this permit in accordance with Minn. Stat. chs. 115, 115A, and 116, and Minn. R.
chs. 7000, 7001, and 7035.
One comment letter was received during the 30 -day public comment period. The MPCA sent a response
to those comments under separate cover. No changes have been made to your permit as a result of the
comment letter received.
If you have any questions regarding any of the terms and conditions of the draft permit, please contact
Holly Kvittem of our staff, at (218) 846-8111 or by email at hoIly.kvittem@state.mn.us.
Sincerely,
'Blaff D.
This document has been electronically signed.
Bill Priebe, P.E.
Supervisor
Municipal Wastewater Section
Municipal Division
BO/HJK:db
Enclosure: Final Permit
cc: Paul Christensen, People Services, Inc. (w/enclosure)
Jan Christensen, Darkenwald's Riverbend Co LLC (w/enclosure)
Jessica Stockamp, Mayor, City of Otsego (w/enclosure)
Wright County Environmental Department
t-wq-wwprm2-20 • 10/28115
Minnesota Pollution Control Agency
National Pollutant Discharge Elimination System/State Disposal System
MN0042251
Permittee: Darkenwald's Riverbend Wastewater Co LLC
Facility name: Riverbend Mobile Home Park Wastewater Treatment Facility
Receiving water: Mississippi River - Class 1C, 2Bd, 3C, 4A, 413, 5, 6 water
City: Otsego County: Wright
Issuance date: March 1, 2016
Expiration date: February 28, 2021
The state of Minnesota, on behalf of its citizens through the Minnesota Pollution Control Agency (MPCA), authorizes the
Permittee to operate a disposal system at the facility named above in accordance with the requirements of this permit.
The goal of this permit is to reduce pollutant levels in point source discharges and protect water quality in accordance
with the U.S. Clean Water Act, Minnesota statues and rules, and federal laws and regulations.
This permit is effective on the issuance date identified above. This permit expires at midnight on the expiration date
identified above.
Signature: Nrff D.
This document has been electronically signed.
Bill Priebe, P.E.
Supervisor
Municipal Wastewater Section
Municipal Division
Submit eDMRs
Submit via the MPCA Online Services Portal at
https•//netweb.pca.state.mn.us/private/
Submit other WQ reports to:
Attention: WQ Submittals Center
Minnesota Pollution Control Agency
520 Lafayette Road North
St. Paul, MN 55155-4194
for the Minnesota Pollution Control Agency
Questions on this permit?
For eDMR and other permit reporting issues, contact:
Jennifer Satnik, 651-757-2692
For specific permit requirements please refer to:
Molly Baumann, 651-757-2204
Wastewater Permit Program general questions, contact:
MPCA, 651-282-6143 or 1-800-657-3938.
Table of Contents
Page
1. Permitted facility description.......................................................................................................................................3
2. Location map of permitted facility...............................................................................................................................4
3. Flow diagram................................................................................................................................................................5
4. Summary of stations and station locations..................................................................................................................6
5. Permit requirements....................................................................................................................................................7
6. Submittal action summary........................................................................................................................................19
7. Limits and monitoring................................................................................................................................................20
Permit issued: March 1, 2016
Permit expires: February 28, 2021
1. Permitted facility description
MN0042251
Page 3 of 23
The Riverbend Mobile Home Park WWTP facility (Facility) is located at Highway 101 & County Road 42, Otsego,
Minnesota 55330, Wright County.
Major components of the Facility include:
• Activated Sludge - extended aeration
• Dechlorination
• Disinfection (chlorination)
• Preliminary treatment - comminutor
• Secondary Clarification
• Solids Treatment - Aerobic Digestion
This Class C Facility has a continuous discharge (SD002) to the Mississippi River (Class 1C, 26d, 3C, 4A, 46, 5, 6 Water),
and is designed to treat an average wet weather flow (AWWF) of 0.06 million gallons per day (mgd) with a 5 -Day
carbonaceous biochemical oxygen demand concentration of 407 mg/liter.
The MPCA has evaluated the treatment components of the wastewater treatment facilities with regards to the mass
limits in the permit. At the time of permit reissuance the Facility is operating at less than the permitted design AWWF
rate of 0.06 mgd and is demonstrating the capability of meeting the new Total Phosphorus effluent mass limit of 290
kg/yr as a 12 Month Moving Total. As the Facility approaches it's AWWF it may need infrastructure improvements
and/or operational changes to maintain compliance with the mass limits.
The Mississippi River - Class 1C, 2Bd, 3C, 4A, 4B, 5, 6 water was designated an Outstanding Resource Value Waters
(ORVW) on November 5, 1984. The design average wet weather flow of this Facility on the date of ORVW designation is
0.06 million gallons per day (mgd).
In accordance with MPCA rules regarding nondegradation for ORVWs, nondegradation review is required for any new or
expanded discharge (Minn. R. 7050.0180). A new discharge is a discharge that was not in existence on the effective date
the ORVW was designated as described in Minn. R. 7050.0460 and 7050.0470. An expanded discharge is a discharge that
changes in volume, quality, location, or any other manner after the effective date the outstanding resource value water
was designated as described in Minn. R. 7050.0460 and 7050.0470, such that an increased loading of one or more
pollutants results. Any change that results in an increased mass loading of one or more pollutants is subject to
nondegradation review in accordance with Minn. R. 7050.0180.
This Permit also complies with Minn. R. 7053.0275 regarding anti -backsliding.
Any point source discharger of sewage, industrial, or other wastes for which a NPDES permit has been issued by the
MPCA that contains effluent limits more stringent than those that would be established by Minn. R. 7053.0215 to
7053.0265 shall continue to meet the effluent limits established by the permit, unless the permittee establishes that less
stringent effluent limits are allowable pursuant to federal law, under section 402(0) of the Clean Water Act, United
States Code, title 33, section 1342.1
Permit issued: March 1, 2016
Permit expires: February 28, 2021
2. Location map of permitted facility
Topographic Map of Permitted Facility
MN0042251: Riverbend MHP Wastewater Treatment Facility
T121N, R23W, Section 26
City of Otsego, Wright Caurft Minnesota
77
22
�. bi . yl
�D001
-' 14
Riverbend MHP Wastewater Treatment Facility
_ ftrirer
'~Riverbend Mobile Home Park MHP
EKY 1 - 34
- sem_
e 1 r�38 _ �5 ,mss• - _-.�,
2013 Ka
td
Map produced by: MPCA Staff, IIA12014j
Source: USGS Quad, Rimbead MHP W WYF 0 o2 0.4 0.8MII[i rj�
Scale: 1:19,000
MN0042251
Page 4 of 23
Permit issued: March 1, 2016
Permit expires: February 28, 2021
3. Flow diagram
Riverbend Mobile Home Park WWTF Flaw Schematic
EFFLUENT TO
MISSISSIPPI
DIGESTER 1 111
COMMINUITER
AERATION
TANK
I INFLUENT I
I WAS I
I RAS I
CLARIFIER I II I BLOWERS
METER Box
QE -CHLORINATION � I CL2 CONTACT
OQ ACT
TANK
MN0042251
Page 5 of 23
Permit issued: March 1, 2016
Permit expires: February 28, 2021
4. Summary of stations and station locations
MN0042251
Page 6 of 23
Station
Type of station
Local name
PLS location
SD 002
Effluent To Surface Water
Effluent to Mississippi
121, 23W, 026,
River (Continuous
Discharge)
WS 001
Influent Waste
Influent Waste Stream
121, 23W, 026, 002 004
Permit issued: March 1, 2016
Permit expires: February 28, 2021
5. Permit requirements
MN0042251
Page 7 of 23
SD 002
Effluent To Surface
Water
Surface Discharge: Class C Minor Facility Effluent Requirements
5.1.1
The Permittee shall submit a monthly DMR : Due by 21 days after the end of each
calendar month following permit issuance. [Minn. R. 7001.0150, Subp. 2(B)]
5.1.2
Sampling Location. [Minn. R. 7001.0150, Subp. 2(B)]
5.1.3
Samples for Station SD002 shall be taken at a point representative of the continuous
discharge from this Facility, prior to any comingling with stormwater. [Minn. R.
7001.0150, Subp. 2(B)]
5.1.4
The Permittee shall submit monitoring results in accordance with the limits and
monitoring requirements for this station. If conditions are such that no sample can be
acquired, the Permittee shall report "No Flow" or "No Discharge" on Discharge
Monitoring Report (DMR) and shall add a Comments attachment to the DMR detailing
why the sample was not collected. [Minn. R. 7001.0150, Subp. 2(B)]
WS 001
Influent Waste
Waste Stream: Class C Facility Influent Requirements
5.2.1
The Permittee shall submit a monthly DMR: Due by 21 days after the end of each
calendar month following permit issuance. [Minn. R. 7001.0150, Subp. 2(B)]
5.2.2
Sampling Location. [Minn. R. 7001.0150, Subp. 2(B)]
5.2.3
Samples for Station WS001 shall be taken at a point representative of the total
influent flow to the system. [Minn. R. 7001.0150, Subp. 2(B)]
5.2.4
The Permittee shall submit monitoring results in accordance with the limits and
monitoring requirements for this station. If conditions are such that no sample can be
acquired, the Permittee shall report "No Flow" or "No Discharge" on Discharge
Monitoring Report (DMR) and shall add a Comments attachment to the DMR detailing
why the sample was not collected. [Minn. R. 7001.0150, Subp. 2(13))
MN0042251
Riverbend Mobile
Home Park WWTP
Surface Discharge Station General Requirements
5.3.1
Analysis Requirements. [Minn. R. 7001]
5.3.2
Dissolved Oxygen, pH, Specific Conductance, Temperature and Total Residual Chloride
analyses shall be conducted within 15 minutes of Sample collection. [Minn. R. 70011
5.3.3
Representative Samples. [Minn. R. 7001]
5.3.4
Samples and measurements required by this permit shall be representative of the
monitored activity. [Minn. R. 70011
5.3.5
Surface Discharge Prohibitions. [Minn. R. 70011
5.3.6
Floating solids or visible foam shall not be discharged in other than trace amounts.
[Minn. R. 7001]
5.3.7
Oil or other substances shall not be discharged in amounts that create a visible color
film. [Minn. R. 7001]
5.3.8
The Permittee shall install and maintain outlet protection measures at the discharge
stations to prevent erosion. [Minn. R. 70011
5.3.9
Winter Sampling Conditions. [Minn. R. 7001]
5.3.10
The Permittee shall sample flows at the designated monitoring stations including
when this requires removing ice to sample the water. If the station is completely
frozen throughout a designated sampling month, the Permittee shall check the "No
Discharge" box on the Discharge Monitoring Report (DMR) and note the ice conditions
in Comments on the DMR. [Minn. R. 7001]
5.3.11
Chlorine Addition Requirements. [Minn. R. 70011 __
Permit issued: March 1, 2016
Permit expires: February 28, 2021
MN0042251
Page 8 of 23
5.3.12
If chlorine is added for any purpose, the Permittee shall monitor the discharge for
Total Residual Chlorine once per day during chlorine usage.A The Permittee shall
report the monitoring data as a comment on the next submitted Discharge Monitoring
Report for the affected station.A The discharge shall not exceed a 0.038 mg/L Total
Residual Chlorine limit. [Minn. R. 7001]
_
5.3.13
Phosphorus Limits and Monitoring Requirements. [Minn. R. 70011
_
_
5.3.14
Phosphorus Calculation Definitions. [Minn. R. 7001)
_
5.3.15
"12 -Month Moving Total" is a rolling total. To calculate, for each month multiply the
total volume of effluent flow (MG) by the monthly average concentration and by a
3.785 conversion factor to get kg/month. Then add all of the monthly values (kg/mo)
during the last twelve months, starting with the monthly total for the month of the
current reporting period. [Minn. R. 7001]
5.3.16
Nitrogen Limits and Monitoring Requirements. [Minn. R. 7001]
5.3.17
"Total Nitrogen" is to be reported asthe summation of the Total Kjeldahl Nitrogen and
Total Nitrite plus Nitrate Nitrogen values. [Minn. R. 7001]
Waste Stream Station General Requirements
5_4.18
Analysis Requirements. [Minn. R. 70011
5.4.19
Dissolved Oxygen, pH, Specific Conductance, Temperature and Total Residual Chloride
analyses shall be conducted within 15 minutes of Sample collection. [Minn. R. 7001]
5.4.20
Representative Samples. [Minn. R. 70011 _
5.4.21
Grab and composite samples shall be collected at a point representative of total
influent flow to the system. [Minn. R. 7001]
Phosphorus Management Plan
5.5.22
The Permittee shall submit a phosphorus management plan : Due by 180 days prior to
permit expiration. [Minn. R. 70011
5.5.23
At a minimum, the PMP shall include the following:
a. A summary of influent and effluent concentrations, mass loadings, and percent
removal calculations using the most recent five years of monitoring data, if available.
b. Identification of existing and potential sources of elevated phosphorus
concentrations and/or loading to the facility. As appropriate for the facility, consider
residential, institutional, municipal, and commercial sources.
c. An evaluation of past and present WWTF operations to determine those operating
procedures that maximize phosphorus removal.
d. A summary of any phosphorus reduction activities implemented during the last five
years.
e. Phosphorus management and reduction goals for the next five years using the
information collected in A through D above.
f. A plan to implement phosphorus management and reduction measures during the
next five years.
PMP guidance can be found on the MPCA internet at
http://www.pca.state.mn.us/enzg8fa or by contacting the compliance staff listed on
the cover page of this permit. [Minn. R. 7001]
Mechanical System _
5.6.24
Bypass Structures. [Minn. R. 70011
5.6.25
All structures capable of bypassing the treatment system shall be manually controlled
and kept locked at all times. [Minn. R. 7001.0030]
5.6.26
Sanitary Sewer Extension Permit. [Minn. R. 7001]
1
5.6.27
The Permittee may be required to obtain a Sanitary Sewer Extension Permit from the
Permit issued: March 1, 2016
Permit expires: February 28, 2021
M N 0042251
Page 9 of 23
MPCA for any addition, extension or replacement to the sanitary sewer. If a sewer
extension permit is required, construction may not begin until plans and specifications
have been submitted and a written permit is granted except as allowed in Minn. Stat.
115.07, Subd. 3(b). [Minn. R. 7001.0020, D]
5.6.28
Operator Certification. [Minn. R. 7001]
_
5.6.29
The Permittee shall provide a Class C state certified operator who is in direct
responsible charge of the operation, maintenance and testing functions required to
ensure compliance with the terms and conditions of this permit. [Minn. R. 94001
5.6.30
If the Permittee chooses to meet operator certification requirements through a
j
contractual agreement, the Permittee shall provide a copy of the contract to the
MPGA, WQ Submittals Center. The contract shall include the certified operator's
name, certificate number, company name if appropriate, the period covered by the
contract and provisions for renewal; the duties and responsibilities of the certified
operator; the duties and responsibilities of the permittee; and provisions for notifying
the MPCA 30 days in advance of termination if the contract is terminated prior to the
expiration date. [Minn. R. 9400]
5.6.31
The Permittee shall notify the MPCAwithin 30 days of a change in operator
certification or contract status. [Minn. R. 94001
Biosolids: Septage Transfer
5.7.32
Authorization. [Minn. R. 7041]
5.7.33
This permit authorizes the permittee to store and/or transfer only wastewater
biosolids and/or septage to another permitted treatment facility for final treatment
and disposal in accordance with the provision in this chapter and Minn. R. ch. 7041.
For the purpose for this permit chapter, septage is referred to as biosolids.
Land application of biosolids and/or septage is not authorized by this permit. [Minn. R.
7041]
_
5.7.34
_
Reporting Requirements. [Minn. R. 7041]
5.7.35
The Permittee shall submit a biosolids annual report : Due annually, by the 31st of
December on a form provided by or approved by the MPCA. The report shall include
the requirements in Minnesota Rules, part 7041.1700. [Minn. R. 7041.1700]
5.7.36
The permittee shall submit a Biosolids Annual Report by December 31 of each year for
biosolids storage and/or transfer activities occurring during the cropping year previous
to December 31. The report shall indicate whether or not biosolids were transferred
and/or stored. If biosolids were transferred, the report shall describe how much was
transferred, where it was transferred to, the name of the facility that accepted the
transfer and the contact person at that facility. "Cropping year" means a year
beginning on September 1 of the year prior to the growing season and ending August
31 the year the crop is harvested. For example, the 2012 cropping year began
September 1, 2011, and ended August 31, 2012. [Minn. R. 7041]
5.7.37
The Permittee shall submit the Biosolids Annual Report to: Biosolids Coordinator,
Minnesota Pollution Control Agency, 520 Lafayette Road North, St Paul Minnesota
551554194. [Minn. R. 7041]
Total Residual Oxidants
_
5.8.38
General Requirements. [Minn. R. 7001]
5.8.39
"Daily Maximum" for Total Residual Chlorine (TRC) concentration limits means:
a. The value of a single sample in a 24-hour period if the concentration of TRC in that
sample is 0.038 mg/L or less.
b. If the concentration of TRC in the first sample is greater than 0.038 mg/L reporting
the average of two to twelve samples analyzed in a 24-hour period is allowed. The
second sample shall be taken two hours after the first sample and subsequent
Permit issued: March 1, 2016
Permit expires: February 28, 2021
MN0042251
Page 10 of 23
samples are to be taken at one-hour intervals thereafter, not to exceed a total of
twelve samples in a 24-hour period. Values below the Reportable Limit for TRC are
assumed to be zero for averaging purposes only.
c. The average value of multiple daily TRC effluent sample analyses shall meet the
0.038 mg/L limit to be in compliance. [State Definitions]
5.8.40
Total Residual Chlorine shall be analyzed immediately. This means within 15 minutes
or less of sample collection. (Minn. R. 7001]
5.8.41
A Method Detection Limit (MDL) shall be established for this parameter. [Minn. R.
7001]
_
5.8.42
The Reportable Limit shall be established for this parameter. This should be based on
the Method Detection Limit and laboratory, analyst, and equipment used in the
analysis. The Reportable Limit cannot be greater than 0.1 mg/L. [Minn. R. 7001]
_
5.8.43
The Method Detection Limit and Reportable Limit should be reassessed when the
method, equipment, laboratory, or analyst changes. [Minn. R. 7001]
5.8.44
Monitoring results below the Reportable Limit should be reported as "<" the
Reportable Limit. For example, if the Reportable Limit is 0.01 mg/L and a parameter is
not detected at a value of 0.01 mg/Lor greater, the concentration shall be reported as
"<0.01 mg/L." The symbol "<" means "less than.". [Minn. R. 7001]
5.8.45
The equipment should be checked against a known standard at least quarterly. [Minn.
R. 7001]
Total Facility Requirements (NPDES/SDS)
5.9.46
Definitions. Refer to the'Permit Users Manual' found on the MPCA website
(www.pca.state.mn.us) for standard definitions. [Minn. R. 7001. ]
5.9.47
Incorporation by Reference. The following applicable federal and state laws are
incorporated by reference in this permit, are applicable to the Permittee, and are
enforceable parts of this permit: 40 CFR pts. 122.41, 122.42, 136, 403 and 503; Minn.
R. pts. 7001, 7041, 7045, 7050, 7052, 7053, 7060, and 7080; and Minn. Stat. ch. 115
and 116. [Minn. R. 7001] _
Permittee Responsibility. The Permittee shall perform the actions or conduct the
5.9.48
activity authorized by the permit in compliance with the conditions of the permit and,
if required, in accordance with the plans and specifications approved by the Agency.
[Minn. R. 7001.0150, subp. 3(E)]
5.9.49
Toxic Discharges Prohibited. Whether or not this permit includes effluent limitations
for toxic pollutants, the Permittee shall not discharge a toxic pollutant except
according to Code of Federal Regulations, Title 40, sections 400 to 460 and Minnesota
Rules 7050, 7052, 7053 and any other applicable MPCA rules. [Minn. R. 7001.1090,
subp. 1(A))
5.9.50
Nuisance Conditions Prohibited. The Permittee's discharge shall not cause any
nuisance conditions including, but not limited to: floating solids; scum and visible oil
film, acutely toxic conditions to aquatic life, or other adverse impact on the receiving
water. [Minn. R. 7050.0210, subp. 21
Property Rights. This permit does not convey a property right or an exclusive privilege.
_
5.9.51
[Minn. R. 7001.0150, subp. 3(C)]
Liability Exemption. In issuing this permit, the state and the MPCA assume no
5.9.52
responsibility for damage to persons, property, or the environment caused by the
activities of the Permittee in the conduct of its actions, including those activities
authorized, directed, or undertaken under this permit. To the extent the state and the
MPCA may be liable for the activities of its employees, that liability is explicitly limited
to that provided in the Tort Claims Act. (Minn. R. 7001.0150, subp. 3(0))
5.9.53
The MPCA's issuance of this permit does not obligate the MPCA to enforce local laws,
rules, or plans beyond what is authorized by Minnesota Statutes. [Minn. R. 7001.0150,
subp. 3(D)]
Permit issued: March 1, 2016
Permit expires: February 28, 2021
MN0042251
Page 11 of 23
5.9.54
Liabilities. The MPCA's issuance of this permit does not release the Permittee from
any liability, penalty or duty imposed by Minnesota or federal statutes or rules or local
ordinances, except the obligation to obtain the permit. [Minn. R. 7001.0150, subp.
3(A)]
5.9.55
_
The issuance of this permit does not prevent the future adoption by the MPCA of
pollution control rules, standards, or orders more stringent than those now in
existence and does not prevent the enforcement of these rules, standards, or orders
against the Permittee. [Minn. R. 7001.0150, subp. 3(B)]
5.9.56
Severability. The provisions of this permit are severable and, if any provisions of this
permit or the application of any provision of this permit to any circumstance are held
invalid, the application of such provision to other circumstances and the remainder of
this permit shall not be affected thereby. [Minn. R. 7001]
5.9.57
Compliance with Other Rules and Statutes. The Permittee shall comply with all
applicable air quality, solid waste, and hazardous waste statutes and rules in the
operation and maintenance of the facility. [Minn. R. 7001]
5.9.58
Inspection and Entry. When authorized by Minn. Stat. ch. 115.04; 11513.17, subd. 4;
and 116.091, and upon presentation of proper credentials, the agency, or an
authorized employee or agent of the agency, shall be allowed by the Permittee to
enter at reasonable times upon the property of the Permittee to examine and copy
books, papers, records, or memoranda pertaining to the construction, modification, or
operation of the facility covered by the permit or pertaining to the activity covered by
the permit; and to conduct surveys and investigations, including sampling or
monitoring, pertaining to the construction, modification, or operation of the facility
covered by the permit or pertaining to the activity covered by the permit. [Minn. R.
7001.0150, subp. 3(Q]
5.9.59
Control Users. The Permittee shall regulate the users of its wastewater treatment
facility so as to prevent the introduction of pollutants or materials that may result in
the inhibition or disruption of the conveyance system, treatment facility or processes,
or disposal system that would contribute to the violation of the conditions of this
permit or any federal, state or local law or regulation. [Minn. R. 7001.0150, subp. 3(F)]
5.9.60
Sampling. [Minn. R. 70011
5.9.61
Representative Sampling. Samples and measurements required by this permit shall be
conducted as specified in this permit and shall be representative of the discharge or
monitored activity. [40 CFR 122.41(j)(1)]
Additional Sampling. If the Permittee monitors more frequently than required, the
5.9.62
results and the frequency of monitoring shall be reported on the Discharge
Monitoring Report (DMR) or another MPCA-approved form for that reporting period.
[Minn. R. 7001.1090, subp. 1(E)]
5.9.63
Certified Laboratory. A laboratory certified by the Minnesota Department of Health
and/or registered by the MPCA shall conduct analyses required by this permit.
Analyses of dissolved oxygen, pH, temperature, specific conductance, and total
residual oxidants (chlorine, bromine) do not need to be completed by a certified
laboratory but shall comply with manufacturers specifications for equipment
calibration and use. [Minn. R. 4740.2010, Minn. R. 4740.2050 through 21201
5.9.64
Sample Preservation and Procedure. Sample preservation and test procedures for the
analysis of pollutants shall conform to 40 CFR Part 136 and Minn. R. 7041.3200. [40
CFR 136, Minn. R. 7041.3200)
5.9.65
Equipment Calibration: Flow meters, pumps, flumes, lift stations or other flow
monitoring equipment used for purposes of determining compliance with permit shall
be checked and/or calibrated for accuracy at least twice annually. [Minn. R.
7001.0150, 2(B and C)]
5.9.66
Maintain Records. The Permittee shall keep the records required by this permit for at
least three years, including any calculations, original recordings from automatic
monitoring instruments, and laboratory sheets. The Permittee shall extend these
Permit issued: March 1, 2016 MN0042251
Permit expires: February 28, 2021 Page 12 of 23
record retention periods upon request of the MPCA. The Permittee shall maintain
records for each sample and measurement. The records shall include the following
information:
a, the exact place, date, and time of the sample or measurement;
b. the date of analysis;
c. the name of the person who performed the sample collection, measurement,
analysis, or calculation;
d. the analytical techniques, procedures and methods used; and
e. the results of the analysis. [Minn. R. 7001.0150, 2(C)]
5.9.67 Completing Reports. The Permittee shall submit the results of the required sampling
and monitoring activities on the forms provided, specified, or approved by the MPCA.
The information shall be recorded in the specified areas on those forms and in the
units specified.
5.9.68
Required forms may include DMR Supplemental/Sample Value Form Individual values
for each sample and measurement shall be recorded on the DMR
Supplemental/Sample Value Form which, if required, will be provided by the MPCA.
DMR Supplemental/Sample Value Forms shall be submitted with the appropriate
DMRs. You may design and use your own supplemental form; however it shall be
approved by the MPCA. Note: Required summary information shall also be recorded
on the DMR. Summary information that is submitted ONLY on the DMR
Supplemental/Sample Value Form does not comply with the reporting requirements.
[Minn. R. 7001.1090, 1(D), Minn. R. 7001.150, 2(B)]
Submitting Reports. DMRs and Supplementals shall be submitted to: MPCA, Attn:
Discharge Monitoring Reports, 520 Lafayette Road North, St Paul Minnesota
551554194.
DMRs, DMR supplemental forms and related attachments may be electronically
submitted via the MPCA Online Services Portal after authorization is approved. When
electronically submitted, the paper DMR submittal requirement is waived.
DMRs and DMR Supplemental Forms shall be postmarked or electronically submitted
by the 21st day of the month following the sampling period or as otherwise specified
in this permit. Electronic DMR submittal shall be complete on or before 11:59 PM of
the 21st day of the month following the sampling period or as otherwise specified in
this permit. A DMR shall be submitted for each required station even if no discharge
occurred during the reporting period.
Other reports required by this permit shall be postmarked by the date specified in the
permit to: MPCA, Attn: WQ Submittals Center, 520 Lafayette Road North, St Paul
Minnesota 551554194. [Minn. R. 7001.0150,2(B), Minn. R. 7001.150, 3(H)1
5.9.69 Incomplete or Incorrect Reports. The Permittee shall immediately submit an
electronically amended report or DMR to the MPCA upon discovery by the Permittee
or notification by the MPCA that it has submitted an incomplete or incorrect report or
DMR. The amended report or DMR shall contain the missing or corrected data along
with a cover letter explaining the circumstances of the incomplete or incorrect report.
If it is impossible to electronically amend the report or DMR, the Permittee shall
immediately notify the MPCA and the MPCA will provide direction for the amendment
submittals. [Minn. R. 7001.0150,3(G)]
5.9.70 Required Signatures. All DMRs, forms, reports, and other documents submitted to the
MPCA shall be signed by the Permittee or the duly authorized representative of the
Permittee. Minn. R. 7001.0150, subp. 2, item D. The person or persons that sign the
DMRs, forms, reports or other documents shall certify that he or she understands and
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Permit expires: February 28, 2021
M N0042251
Page 13 of 23
complies with the certification requirements of Minn. R. 7001.0070 and 7UULWAU,
including the penalties for submitting false information. Technical documents, such as
design drawings and specifications and engineering studies required to be submitted
as part of a permit application or by permit conditions, shall be certified by a
registered professional engineer. [Minn. R. 7001.0540]
5.9.71
Detection Level. The Permittee shall report monitoring results below the reporting
limit (RL) of a particular instrument as "<" the value of the RL. For example, if an
instrument has a RL of 0.1 mg/L and a parameter is not detected at a value of 0.1 mg/L
or greater, the concentration shall be reported as "<0.1 mg/L." "Non-detected,"
"undetected," "below detection limit," and "zero" are unacceptable reporting results,
and are permit reporting violations.
Where sample values are less than the level of detection and the permit requires
reporting of an average, the Permittee shall calculate the average as follows:
a. If one or more values are greater than the level of detection, substitute zero for all
nondetectable values to use in the average calculation.
b. If all values are below the level of detection, report the averages as "<" the
corresponding level of detection.
c. Where one or more sample values are less than the level of detection, and the
permit requires reporting of a mass, usually expressed as kg/day, the Permittee shall
substitute zero for all nondetectable values. [Minn. R. 7001.0150, 2(13)]
5.9.72
Records. The Permittee shall, when requested by the Agency, submit within a
reasonable time the information and reports that are relevant to the control of
pollution regarding the construction, modification, or operation of the facility covered
by the permit or regarding the conduct of the activity covered by the permit. [Minn. R.
7001.0150, 3(H)]
5.9.73
Confidential Information. Except for data determined to be confidential according to
Minn. Stat. ch. 116.075, subd. 2, all reports required by this permit shall be available
for public inspection. Effluent data shall not be considered confidential. To request the
Agency maintain data as confidential, the Permittee shall follow Minn. R. 7000.1300.
[Minn. R. 7000.13001 __--
5.9.74
Noncompliance and Enforcement. [Minn. R. 7001]
_
5.9.75
Subject to Enforcement Action and Penalties. Noncompliance with a term or condition
of this permit subjects the Permittee to penalties provided by federal and state law
set forth in section 309 of the Clean Water Act; United States Code, title 33, section
1319, as amended; and in Minn. Stat. ch. 115.071 and 116.072, including monetary
penalties, imprisonment, or both. [Minn. R. 7001.1090, 1(B)]
5.9.76
Criminal Activity, The Permittee may not knowingly make a false statement,
representation, or certification in a record or other document submitted to the
Agency. A person who falsifies a report or document submitted to the Agency, or
tampers with, or knowingly renders inaccurate a monitoring device or method
required to be maintained under this permit is subject to criminal and civil penalties
provided by federal and state law. [Minn. R. 7001.0150, 3(G), Minn. R. 7001.1090, 1(G
and H), Minn. Stat. ch. 609.671, 1] _
5.9.77
Noncompliance Defense. It shall not be a defense for the Permittee in an enforcement
action that it would have been necessary to halt or reduce the permitted activity in
order to maintain compliance with the conditions of this permit. [40 CFR 122.41(c)]
5.9.78
Effluent Violations. If sampling by the Permittee indicates a violation of any discharge
limitation specified in this permit, the Permittee shall immediately make every effort
to verify the violation by collecting additional samples, if appropriate, investigate the
cause of the violation, and take action to prevent future violations. If the permittee
discovers that noncompliance with a condition of the permit has occurred which could
endanger human health, public drinking water supplies, or the environment, the
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Permit expires: February 28, 2021
MN0042251
Page 14 of 23
Permittee shall within 24 hours of the discovery of the noncompliance, orally notify
the commissioner and submit a written description of the noncompliance within 5
days of the discovery. The written description shall include items a. through e., as
listed below. If the Permittee discovers other non-compliance that does not explicitly
endanger human health, public drinking water supplies, or the environment, the non-
compliance shall be reported during the next reporting period to the MPCA with its
Discharge Monitoring Report (DMR). If no DMR is required within 30 days, the
Permittee shall submit a written report within 30 days of the discovery of the
noncompliance. This description shall include the following information:
a. a description of the event including volume, duration, monitoring results and
receiving waters;
b. the cause of the event;
c. the steps taken to reduce, eliminate and prevent reoccurrence of the event;
d. the exact dates and times of the event; and
e. steps taken to reduce any adverse impact resulting from the event. [Minn. R.
7001.150, 3(K)]
5.9.79 Upset Defense. In the event of temporary noncompliance by the Permittee with an
applicable effluent limitation resulting from an upset at the Permittee's facility due to
factors beyond the control of the Permittee, the Permittee has an affirmative defense
to an enforcement action brought by the Agency as a result of the noncompliance if
the Permittee demonstrates by a preponderance of competent evidence:
a. the specific cause of the upset;
b. that the upset was unintentional;
c. that the upset resulted from factors beyond the reasonable control of the Permittee
and did not result from operational error, improperly designed treatment facilities,
inadequate treatment facilities, lack of preventative maintenance, or increases in
production which are beyond the design capability of the treatment facilities;
d. that at the time of the upset the facility was being properly operated;
e. that the Permittee properly notified the Commissioner of the upset in accordance
with Minn. R. 7001.1090, subp. 1, item I; and
f. that the Permittee implemented the remedial measures required by Minn. R.
7001.0150, subp. 3, item J. [Minn. R. 7001.1090]
5.9.80 Release. [Minn. R. 7001]
5.9.81 Unauthorized Releases of Wastewater Prohibited. Except for discharges from outfalls
specifically authorized by this permit, overflows, discharges, spills, or other releases of
wastewater or materials to the environment, whether intentional or not, are
prohibited. However, the MPCA will consider the Permittee's compliance with permit
requirements, frequency of release, quantity, type, location, and other relevant
factors when determining appropriate action. [40 CFR 122.41, Minn. Stat. ch. 115.0611
5.9.82 Discovery of a release. Upon discovery of a release, the Permittee shall:
a. Take all reasonable steps to immediately end the release.
b. Notify the Minnesota Department of Public Safety Duty Officer at 1(800)422-0798
or (651)649-5451(metroarea) immediately upon discovery of the release. You may
contact the MPCA during business hours at 1(800)657-3864 or (651)296-6300 (metro
area).
c. Recover as rapidly and as thoroughly as possible all substances and materials
released or immediately take other action as may be reasonably possible to minimize
or abate pollution to waters of the state or potential impacts to human health caused
thereby. If the released materials or substances cannot be immediately or completely
recovered, the Permittee shall contact the MPCA. If directed by the MPCA, the
Permittee shall consult with other local, state or federal agencies (such as the
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Permit expires: February 28, 2021 Page 15 of 23
5.9.83
Minnesota Department of Natural Resources and/or the Wetland Conservation Act
authority) for implementation of additional clean-up or remediation activities in
wetland or other sensitive areas. [Minn. R. 7001.1090]
Sampling of a release. Upon discovery of a release, the Permittee shall:
a. Collect representative samples of the release. The Permittee shall sample the
release for parameters of concern immediately following discovery of the release. The
Permittee may contact the MPCA during business hours to discuss the sampling
parameters and protocol. In addition, Fecal Coliform Bacteria samples shall be
collected where it is determined by the Permittee that the release contains or may
contain sewage. If the release cannot be immediately stopped, the Permittee shall
consult with MPCA regarding additional sampling requirements. Samples shall be
collected at least, but not limited to, two times per week for as long as the release
continues.
b. Submit the sampling results on the Release Sampling Form
(http://www.pca.state.mn.us/index.php/view-document.html?gid=18867). The
Release Sampling Form shall be submitted to the MPCA with the next DMR or within
30 days whichever is sooner. [Minn. R. 7001.10901
5.9.84 Bypass. [Minn. R. 70011
5.9.85 Anticipated bypass. The permittee may allow any bypass to occur which does not
cause effluent limitations to be exceeded, but only if the bypass is for essential
maintenance to assure efficient operation of the facility. The permittee shall submit
prior notice, if possible at least ten days before the date of the bypass to the MPCA.
The notice of the need for an anticipated bypass shall include the following
information:
a. the proposed date and estimated duration of the bypass;
b. the alternatives to bypassing; and
c. a proposal for effluent sampling during the bypass. Any bypass wastewater shall
enter waters of the state from outfalls specifically authorized by this permit.
Therefore, samples shall be collected at the frequency and location identified in this
permit or two times per week for as long as the bypass continues, whichever is more
frequent. [40 CFR 122.41(m)(2 and 3), Minn. R. 7001.1090, 1(J)]
5.9.86 All other bypasses are prohibited. The MPCA may take enforcement action against the
Permittee for a bypass, unless the specific conditions described in Minn. R. Ch.
7001.1090 subp. 1, K and 122.41(m)(4)(i) are met.
In the event of an unanticipated bypass, the permittee shall:
a. Take all reasonable steps to immediately end the bypass.
b. Notify the Minnesota Department of Public Safety Duty Officer at 1(800)422-0798
or (651)649-5451(metroarea) immediately upon commencement of the bypass. You
may contact the MPCA during business hours at 1(800)657-3864 or (651)296-6300
(metro area).
c. Immediately take action as may be reasonably possible to minimize or abate
pollution to waters of the state or potential impacts to human health caused thereby.
If directed by the MPCA, the Permittee shall consult with other local, state or federal
agencies for implementation of abatement, clean-up, or remediation activities.
d. Only allow bypass wastewater as specified in this section to enter waters of the
state from outfalls specifically authorized by this permit. Samples shall be collected at
the frequency and location identified in this permit or two times per week for as long
as the bypass continues, whichever is more frequent. The permittee shall also follow
the reporting requirements for effluent violations as specified in this permit. [40 CFR
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MN 0042251
Page 16 of 23
122.41(m)(4)(i), Minn. R. 7001.1090,1(K), Minn. Stat. ch. 115.061]
5.9.87
Operation and Maintenance. [Minn. R. 70011 _
5.9.88
The Permittee shall at all times properly operate and maintain the facilities and
systems of treatment and control, and the appurtenances related to them which are
installed or used by the Permittee to achieve compliance with the conditions of the
permit. Proper operation and maintenance includes effective performance, adequate
funding, adequate operator staffing and training, and adequate laboratory and
process controls, including appropriate quality assurance procedures. The Permittee
shall install and maintain appropriate backup or auxiliary facilities if they are necessary
to achieve compliance with the conditions of the permit and, for all permits other
than hazardous waste facility permits, if these backup or auxiliary facilities are
technically and economically feasible Minn. R. 7001.0150. subp. 3, item F. [Minn. R.
7001.0150, 3(F)]
5.9.89
In the event of a reduction or loss of effective treatment of wastewater at the facility,
the Permittee shall control production or curtail its discharges to the extent necessary
to maintain compliance with the terms and conditions of this permit. The Permittee
shall continue this control or curtailment until the wastewater treatment facility has
been restored or until an alternative method of treatment is provided. [Minn. R.
7001.1090,1(c)]
5.9.90
Solids Management. The Permittee shall properly store, transport, and dispose of
biosolids, septage, sediments, residual solids, filter backwash, screenings, oil, grease,
and other substances so that pollutants do not enter surface waters or ground waters
of the state. Solids should be disposed of in accordance with local, state and federal
requirements. [40 CFR 503, Minn. R. 7041]
5.9.91
Scheduled Maintenance. The Permittee shall schedule maintenance of the treatment
works during non-critical water quality periods to prevent degradation of water
quality, except where emergency maintenance is required to prevent a condition that
would be detrimental to water quality or human health. [Minn. R. 7001.0150, 3(F),
Minn. R. 7001.150, 2(B)]
5.9.92
Control Tests. In -plant control tests shall be conducted at a frequency adequate to
ensure compliance with the conditions of this permit. [Minn. R. 7001.0150, 3(F), Minn.
R. 7001.150, 2(B)] _
5.9.93
Changes to the Facility or Permit. [Minn. R. 7001]
5.9.94
Permit Modifications. Except as provided under Minnesota Statutes, section 115.07,
subdivisions 1 and 3, no person required by statute or rule to obtain a permit may
construct, install, modify, or operate the facility to be permitted, nor shall a person
commence an activity for which a permit is required by statute or rule until the agency
has issued a written permit for the facility or activity.
Permittees that propose to make a change to the facility or discharge that requires a
permit modification shall follow Minn. R. 7001.0190. If the Permittee cannot
determine whether a permit modification is needed, the Permittee shall contact the
MPCA prior to any action. It is recommended that the application for permit
modification be submitted to the MPCA at least 180 days prior to the planned change.
[Minn. R. 7001.00301
5.9.95
Plans, specifications and MPCA approval are not necessary when maintenance
dictates the need for installation of new equipment, provided the equipment is the
same design size and has the same design intent. For instance, a broken pipe, lift
station pump, aerator, or blower can be replaced with the same design -sized
equipment without MPCA approval.
If the proposed construction is not expressly authorized by this permit, it may require
a permit modification. If the construction project requires an Environmental
Assessment Worksheet under Minn. R. 4410, no construction shall begin until a
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MN0042251
Page 17 of 23
negative declaration is issued and all approvals are received or implemented. [Minn.
R. 7001.0030]
5.9.96 Report Changes. The Permittee shall give advance notice as soon as possible to the
MPCA of any substantial changes in operational procedures, activities that may alter
the nature or frequency of the discharge, and/or material factors that may affect
compliance with the conditions of this permit. [Minn. R. 7001.0150, 3(M)]
5.9.97 Chemical Additives. The Permittee shall receive prior written approval from the MPCA
before increasing the use of a chemical additive authorized by this permit, or using a
chemical additive not authorized by this permit, in quantities or concentrations that
have the potential to change the characteristics, nature and/or quality of the
discharge.
The Permittee shall request approval for an increased or new use of a chemical
additive at least 60 days, or as soon as possible, before the proposed increased or new
use. This written request shall include at least the following information for the
proposed additive:
a. The process for which the additive will be used;
b. Safety Data Sheet (SDS) which shall include aquatic toxicity, human health, and
environmental fate information for the proposed additive. The aquatic toxicity
information shall include at minimum the results of: a) a 48-hour LC50 or EC50 acute
study for a North American freshwater planktonic crustacean (either Ceriodaphnia or
Daphnia sp.) and b) a 96 -hour LC50 acute study for rainbow trout, bluegill or fathead
minnow or another North American freshwater aquatic species other than a
planktonic crustacean;
c. a complete product use and instruction label;
d. the commercial and chemical names and Chemical Abstract Survey (CAS) number
for all ingredients in the additive (If the MSDS does not include information on
chemical composition, including percentages for each ingredient totaling to 100%, the
Permittee shall contact the supplier to have this information provided); and
e. The proposed method of application, application frequency, concentration, and
daily average and maximum rates of use.
Upon review of the information submitted regarding the proposed chemical additive,
the MPCA may require additional information be submitted for consideration. This
permit may be modified to restrict the use or discharge of a chemical additive and
include additional influent and effluent monitoring requirements. Approval for the
use of an additive shall not justify the exceedance of any effluent limitation nor shall it
be used as a defense against pollutant levels in the discharge causing or contributing
to the violation of a water quality standard. [Minn. R. 7001.0170]
5.9.98 MPCA Initiated Permit Modification, Suspension, or Revocation. The MPCA may
modify or revoke and reissue this permit pursuant to Minn. R. 7001.0170. The MPCA
may revoke without reissuance this permit pursuant to Minn. R. 7001.0180. [Minn. R.
7001.0170, Minn. R. 7001.0180]
5.9.99 TMDL Impacts. Facilities that discharge to an impaired surface water, watershed or
drainage basin may be required to comply with additional permits or permit
requirements, including additional restriction or relaxation of limits and monitoring as
authorized by the CWA 303(d)(4)(A) and 40 CFR 122.44.1.2.i., necessary to ensure
consistency with the assumptions and requirements of any applicable US EPA
approved wasteload allocations resulting from Total Maximum Daily Load (TMDL)
studies. [40 CFR 122.44(I)(2)(i)]
5.9.100 Permit Transfer. The permit is not transferable to any person without the express
written approval of the Agency after compliance with the requirements of Minn. R.
7001.0190. A person to whom the permit has been transferred shall comply with the
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MN0042251
Page 18 of 23
conditions of the permit. [Minn. R. 7001.0150, 3(N)]
5.9.101
Facility Closure. The Permittee is responsible for closure and post -closure care of the
facility. The Permittee shall notify the MPCA of a significant reduction or cessation of
the activities described in this permit at least 180 days before the reduction or
cessation. The MPCA may require the Permittee to provide to the MPCA a facility
Closure Plan for approval.
Facility closure that could result in a potential long-term water quality concern, such
as the ongoing discharge of wastewater to surface or ground water, may require a
permit modification or reissuance.
The MPCA may require the Permittee to establish and maintain financial assurance to
ensure performance of certain obligations under this permit, including closure, post -
closure care and remedial action at the facility. If financial assurance is required, the
amount and type of financial assurance, and proposed modifications to previously
MPCA-approved financial assurance, shall be approved by the MPCA. [Minn. Stat. ch.
116.07, 4] _
5.9.102
Permit Reissuance. If the Permittee desires to continue permit coverage beyond the
date of permit expiration, the Permittee shall submit an application for reissuance at
least 180 days before permit expiration. If the Permittee does not intend to continue
the activities authorized by this permit after the expiration date of this permit, the
Permittee shall notify the MPCA in writing at least 180 days before permit expiration.
If the Permittee has submitted a timely application for permit reissuance, the
Permittee may continue to conduct the activities authorized by this permit, in
compliance with the requirements of this permit, until the MPCA takes final action on
the application, unless the MPCA determines any of the following (Minn. R. 7001.0040
and 7001.0160):
a. The Permittee is not in substantial compliance with the requirements of this
permit, or with a stipulation agreement or compliance schedule designed to bring the
Permittee into compliance with this permit;
b. The MPCA, as a result of an action or failure to act by the Permittee, has been
unable to take final action on the application on or before the expiration date of the
permit;
c. The Permittee has submitted an application with major deficiencies or has failed to
properly supplement the application in a timely manner after being informed of
deficiencies. [Minn. R. 7001.01601
5.9.103
The Permittee shall submit an application for permit reissuance : Due by 180 days
prior to permit expiration. [Minn. R. 7001.01601
Permit issued: March 1, 2016
Permit expires: February 28, 2021
6. Submittal action summary
SD 002 Effluent To Surface
MN0042251
Page 19 of 23
Water
Surface Discharge: Class C Minor Facility Effluent Requirements
6.1.1
The Permittee shall submit a monthly DMR; Due by 21 days after the end of each
calendar month following permit issuance. [Minn. R. 7001.0150, Subp. 2(B)]
WS 001
Influent Waste
Waste Stream: Class C Facility Influent Requirements
6.2.1
The Permittee shall submit a monthly DMR : Due by 21 days after the end of each
calendar month following permit issuance. [Minn. R. 7001.0150, Subp. 2(B)]
MN0042251
Riverbend Mobile
Home Parl< WWTP
Phosphorus Management Plan
6.3.1
The Permittee shall submit a phosphorus management plan : Due by 180 days prior
to permit expiration. [Minn. R. 7001]
Biosolids: Septage Transfer
6.4.2
The Permittee shall submit a biosolids annual report : Due annually, by the 31st of
December on a form provided by or approved by the MPCA. The report shall include
the requirements in Minnesota Rules, part 7041.1700. (Minn. R. 7041.1700]
Total Facility Requirements (NPDES/SDS)
6.5.3
The Permittee shall submit an application for permit reissuance : Due by 180 days
prior to permit expiration. [Minn. R. 7001.0160]
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Attachment B
,ORN, 251-R
SPECIFICATIONS
FOR
RECTANGULAR
"AER-O-FLO" CONTACT STABILIZATION
SEWAGE TREATMENT PLANTS
PREFABRICATED STEEL
DRn.iFCT: RIVER BEND PARK
JOB #100524
^,93EL CSR -90 -710 -15 -EA
Or.-IGN FLOW 90,000
DATE
5-8-72
CLOW CORPOR,-'NTION
WASTE TREATMENT OIVIS:ON
P. 0. Box 324
FLORENCE, KENTUCK`! 41042
SPECIFICATIONS FOR
c l6i� f
CONTACT STABILIZATION
SEWAGE TREATMENT PLANTS
GENERAL: Furnish and install one factory built contact stabilization sewage treatment
plant, complete and ready for operation in accordance with plans and.specifications
stated herein. The plant shall be an Aer-O-Flo Model CSR -90 -610=10 -EA as manu-
factured by the Clow Corporation. The sewage treatment plant sa e based on the
contact stabilization treatment process and shall be capable of treating 901000
gallons per day domestic sewage of 200 parts per million 5 day B.O.D. from composite
samples of the average daily flow. The complete plant shall include screening, aeration,
.-and secondary clarification.
SCREENING: All raw sewage tributary to the plant shall pass through screening equipment
as indicated in the following specifications.
STEEI-TANK: The tank shall be 1/4" steel plate joined by arc welding with fillets of
adayuate section for the joint involved. Walls shall be continuous and watertight and
shall be supported by structural members where required. Tanks shall be transported to
the jobsite in sections. The contractor shall provide necessary field assembly to complete
the installation. Two coats of bitumastic paint shall be applied to all outside surfaces;
two coats of bitumastic to the inside surfaces; and any surfaces damaged in shipment shall
he retouched with the same material during installation. For cathodic protection, 6
magnesium anodes shall be buried by the contractor on_the sides of the tanks and securely
connected thereto by heavy copper wire in good electriv4d ;,.untact with the steel tank.
A poured concrete foundation slab, as indicated on the plans, shall be provided in the
field for anchoring the steel plant. This slab shall be supplied by the contractor.
AERATION CHAMBER: The aeration chamber shall have the total capacity of 60,000
gallons. The aeration chamber shall be divided into three compartments designated as
(1)mixing aeration compartment, with a capacity of 11,250 gallons, (2) sludge
reaeration compartment, 28,554. gallons, and the (3) aerobic digestion compartment,
20,196 gallons. The combined capacity of the mixing aeration compartment and
s udge reaeration to pro, ide a minimum of 10.6 hours retention of the design flow.
The aerobic digestor compartment shall have the capacity of 3 cubic feet per
capita. The tank shall Le filleted on each side, at the bottom, to prevent sludge ac-
cumulation, and at they -:)p to enhance rotation of tank contents and prevent scum and
froth accumulation. Th,_ aeration chamber shall be constructed with air diffusers placed
longitudinally along on(: side of the chamber so as to, in conjunction with the flow control
baffles, enhance the spiral rotation of chamber contents. This insures maximum retention
time and elimination of short circuiting of raw sewage para cies as encountered in aeration
chambers utilizing end io end rotation.) The proportion o` chamber width to depth, in
direction of rotation, sl,:ill not exceed 1 .33 to 1 and shall be in such proportion that the
velocity of rotation so p •omoted shall be sufficient to scour the chamber's bottom and
prevent sludge filleting, as well as to prevent the escape `-.) the surface of minisule air
diffusion bubbles and by so causing their entrapment to provide maximum oxygenation
efficiency.
EoW AER O -R0 /
AIR DIFFUSION: Diffuser air shall be supplied by 2 positive displacement
blowers) (each) of ample size based on-B.O.Q. application to provide a minimum of
1800 cubic feet of air per pound of B.O.Q. applied and/or based on tank cleansing
velocities to provide a minimum of 3 cubic feet of air/linear foot of aeration tank
length. There shall be a minimum of one AER-O-FLO hon -clog Disc Diffuser for every
ten inches of aeration tank length. The diffusers shall be parallel to and near the base
of the tank and at an elevation which will provide the optimum diffusion and mixing
of the tank contents: The diffuser assembly shall be easily removed from the tank and
shall be equipped with an air regulating valve permitting cdiustment of the air flow
or complete shut-off. The AER-O-FLO Disc Diffuser shal I be constructed of 302
stainless steel. It shall be designed to handle a wide range of air flow varying the
orifice opening automatically to the flow, this insuring small uniform bubble distribution.
The oxygen transfer capacity of each diffuser shall be such that an adequate supply of
oxygen will be maintained in the aeration chamber to meet treatment requirements of
the design sewage load.
BLOWER AND MOTOR DRIVE: There shall be two �tl ) blower/motor units supplied,
each meeting the following specifications: The blower shall deliver 300 CFM @
P ,_..
5 psi. The motor drive shall be g , 6 HP, 1750 RPM, 240 volt, 1 (3) phase, 60
cycle, *rotor with V -belt drive. The b ower and motor shell be mounted in a weather-
proof enclosure, constructed of 16 gauge -stere -I supported by the required structural
members fo obtain rig;-dity. All parts shall be phosphatize:d and double coated with 1
a baked enamel finish. For easy access to the controls, blower and motor, three
access doors, equipped with locking device shall -be supplied. Each access door shall
be detachable from the enclosure. For proper air ventilation, louvers shall be placed
in the end of the blower and motor enclosure. For the reduction of the inlet air noise
and the filtration of the inlet air, there shall be supplied an air -maze dry type filter -
silencer. The filter-si:encer shall be as manufactured by the RockwelI-Standard
Corporation, or approved equal . The blower cabinets shall -be located as shown on
the plans.
ELECTRICAL CONTROLS: The electrical controls shall consist of the necessary magnetic
starters, time clocks and switches, to automatically cont•ol all electric motors on.the
plant. The blower &k1 froth control pump motors shall be controlled by a hand -off -auto
selecter switch in conjunction with a magnetic starter and one or two timers as determined
by the variation in flo:v rate. All electric equipment and circuitry shall be protected by
a properly sized circuit breaker. The prewired electrical control panel shall be mounted
on the motor -blower h_using. Any duplex or standby eq_Apment required shall be wired
so that they may be al-ernated automatically by controls located with the control housing.
METAL GRATING: Grip Strut galvanized metal grating panels shall be provided for walk-
ways to service the equipment. The grating panels shall be 13" maximum in width and
constructed of 14 gauc;e galvanized sheet metal formed, oerforated, and extruded so -as
to permit maximum opt:n area over the entire tank. The maximum weight of each panel
shall not exceed caps _i}y of 40 pounds per square foot without excessive deflection.
-2-
SPECIFICATIONS
GRAVITY CLARIFIER
CLARIFIER CHAMBER: The clarifier chamber shall be of ample size to provide a minimum
of. four hours retention, based upon the some flow rates governing the aeration chamber
and shall have proper baffling. The total settling volume shall include the volume of the
upper 1/3 of the sludge hopper. The bottom of the chamber shall be formed into an
inverted pyramidal hopper or hoppers. Flat bottom area of each hopper shall be in no
case greater than one square foot. The slope of the hopper walls shal I not be less
than 1.7 vertical to 1 .0 horizonal. Settled sludge shall be returned from the clarifier
sludge hopper to the aeration chamber by the positive sludge return system. The
clarifier effluent shall pass over the edge of the effluent weir into the effluent trough
and then out of the chamber. The effluent weir shall be mounted to permit easy adjust-
ment for level and height.
AIRLIFT SLUDGE RETUnN SYSTEM: There shall be installed within the clarifier chamber
caex(two) 4" diameter rirlift sludge return assembly (ies) meeting the following speci-
fications: The airlift pump shall have a recirculation capacity of 0% to 100% of
design flow. The. air Line supplying air to the pump shall be equipped with a needle
valve to vary the amount of air to each pump, thus varying the capacity of the airlift
pump. The airlift pumps shall be firmly supported and shall be equipped with; a clean-
out plug to allow for easy cleaning an.cl,maintenance. The minimum size airlift sludge
pump shall be 4" diameter to minimize clogging.
SKIMMING RETURN SYSTEM: There shall be 76N9 (two) airlift skimming device (s),
(each) meeting the following specifications: The skimming device shall be of the
positive airlift pump type , located in the settling tank to skim and return floating
material to the aeration tank. The air line supplying a'r to the skimming device
shall be equipped with a needle valve to regulate the rote of return..
FROTH CONTROL: r, c(1/2) H.P., 220 volt, single phase, SO G.P.M.
froth control pump shell be provided in the clarifier charnber and sufficient spray
nozzles attached to the discharge line of the pump to insure control of frothing or
foaming in the aeraticn chamber. The Aer-O-Spray sp-ciy nozzle shall be of the
weighed counter I ev-Sr type -v"vith a"flip-open cap for quicK flush cleaning of the
nozzle 1/2" diameter orifice. The spray nozzle shall produce a sharp spray pattern
along the entire length of aeration tank. A hose bib" sl,c I I be furnished between the
discharge side of the pump and spray nozzle shut-off vc,lve to provide wash-up water
_ w.hen required.
RE, CTANGULAR
CO;ITACT- •STII "T ZATIOZI
� ._� .ra ti ✓-- .i :' .ar a.1L..� it i..:.i I�z ! .G DESIGN DATA
* --• River Bend park Job No.
' project r.a,�.e -
yocatzon -
Elk River,-Minnesota Date 5-8-72
model Y.O. CSR-90-610-10 -EA
900
��» � r '� lCO pai s/Can/Da.- 90,000
GaLons -
- .D. T /D T178
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Aeration
11'-01,
piant,Tot,
721-011
Aeration "'''- =^mot:. Cerin
17 -13 8,021
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Aerati on 1 ank o
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,f r. of C' ._-
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f!Gals � 1,304 / 11 250
0 C) Vol=e
IL-s. 3-
Retention Time
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nth or C� 341-311
- zo Ler._ 9'-6" -
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surface Area 1 0
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3,750
4
RECTANGULAR
C014TACT STABILIZATION
DESIGN DATA
15,000
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•Minutes
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Attachment C
DRAINAGE EASEMENT AGREEMENT
TMS EASEMENT AGREEMENT ("Agreement") is made as of this 2. day of
November, 2005, by and between THE D & Y FAMILY LIMITED PARTNERSHIP, a
Minnesota limited partnership (hereinafter referred to as the "Grantor") and
DARKENWALD'S RIVERBEND WASTEWATER FACILITY COMPANY LLP, a
Minnesota limited liability partnership (hereinafter referred to as the "Grantee").
RECITALS:
WHEREAS, Grantor is the fee owner of the real property located in Wright
County, Minnesota and legally described on Exhibit A, attached hereto and incorporated
herein by reference (the "Burdened Property"); and
WHEREAS, Grantee is the fee owner of the real property located in Wright
County, Minnesota and legally described on Exhibit B, attached hereto and incorporated
herein by reference (the "Benefitted Property"); and
WHEREAS, Grantor intends to grant to Grantee, and its successors and assigns, an
easement over and across the Burdened Property for drainage purposes, pursuant to the
terms and provisions of this Agreement.
NOW, THEREFORE, in consideration of the mutual promises and premises set
forth herein, and other good and valuable consideration, the receipt and sufficiency of
which is hereby acknowledged, the parties agree as follows:
1. Drainage Easement. Grantor hereby grants and conveys to Grantee, and its
successors and assigns, a permanent, perpetual and non-exclusive easement over, across
and under the real property located in Wright County, Minnesota and legally described on
Exhibit C, attached hereto and incorporated herein by reference, as depicted on Exhibit D,
attached hereto and incorporated herein by reference (the "Easement Property"), for
drainage purposes, including, but not limited to, the discharge and drainage of Grantee's
wastewater from its wastewater treatment facility located on the Benefitted Property, and
for the purpose of allowing Grantee to construct, install, maintain, repair and/or replace
any piping, culverts, equipment, materials or other items for drainage purposes over,
across and under the Easement Property, together wish the right to excavate and refill
ditches and/or trenches for the location of the drainage easement, and the further right to
remove trees, bushes, undergrowth and other obstructions interfering with the location,
construction, installation, maintenance, repair and/or replacement of the drainage easement
(collectively the "Drainage Easement").
2. Access Easement. In addition, Grantor hereby grants and conveys to
Grantee, and its successors and assigns, a permanent, perpetual and non-exclusive
easement for ingress and egress over and across the Burdened Property for the purpose of
providing Grantee access to the Easement Property in order to construct, maintain, repair,
replace and/or inspect the Drainage Easement (collectively the "Access Easement") (the
Drainage Easement and the Access Easement are collectively referred to as the
"Easements ").
3. Maintenance of the Easement Property Grantee agrees to repair all
damage to the Burdened Property caused by Grantee or its employees, agents and
contractors as a result of Grantee's use of the Easements granted hereunder.
4. Indemnification. Grantee shall and hereby does indemnify and hold
harmless Grantor, and its successors and assigns, and any lender that holds a lien covering
any property affected by the Easements herein granted, from and against all liability,
claims, damages, suits, actions, costs and expenses of whatsoever nature (including
reasonable attorneys's fees) to persons or property caused by or arising out of any of
Grantee's operations hereunder or otherwise relating to Grantee's rights or obligations
hereunder and/or caused by or arising out of Grantee's (or its employees', agents' or
contractors') failure to comply at all times with all applicable laws, rules, regulations and
safety standards in connection with the exercise of Grantor's rights or performance of its
obligations hereunder.
5. Notices. Any notice to be given by a party to this Agreement shall be
personally delivered or sent by registered or certified mail, or by a nationally recognized
overnight courier which issues a receipt, in each case postage prepaid, to the last known
address of the applicable party, and shall be deemed given upon personal delivery, the date
postmarked or delivered to such courier.
6. Authority. Grantor and Grantee personally represent and warrant that they
each have full right and authority to execute this Agreement and that the person or persons
signing below on behalf of each of them was authorized to do so.
7. Rights to Cure. If either party fails to perform or comply with any of the
terms, covenants, restrictions or conditions to be performed or complied with pursuant to
this Agreement, and any such failure, if it relates to a matter which is not of an emergency
-2-
nature, remains uncured for a period of twenty (20) days after one party gives the other
notice of such failure, or if in the good -faith judgment of the notifying party, such failure
relates to a matter of an emergency nature, the notifying party shall have the right to
perform any such term, covenant, restriction or condition or cause compliance with the
same, and all costs and expenses incurred by the notifying party as a result thereof shall be
immediately owing by the other party, and such debt shall bear interest at the lesser of
twelve (12%) percent per annum or the maximum legal rate thereon from the date such
amount became due until the date of payment.
S. Easements Run with Land. The Easements granted hereunder are
perpetual and shall run with the title to the Burdened Property and Benefitted Property and
shall be binding upon -all present and successive owners of interest in the Burdened
Property and Benefitted Property.
9. Notice of Sale. The rights granted by this Agreement are freely assignable
without the consent of any other party. However, in the event either party assigns all or
any portion of its rights under this Agreement, the assignor shall provide the other party
with not less than thirty (30) days advanced written notice of any such assignment, which
notice shall contain the name and address of the assignee and the date of the anticipated
assignment.
10. Counterparts. This Agreement may be executed in multiple counterparts all
of which taken together shall constitute a single agreement with the same force and effect
as if all parties had signed the same copy of this Agreement.
Il. Modification. This Agreement shall not be modified or amended except by
a writing executed by Grantor and Grantee, or their respective successors and assigns.
12. Enforcement and Severability . Either Grantor or Grantee may bring an
action to enforce the provisions of this Agreement, and shall be entitled to all remedies
available at law or in equity. In any such action, the prevailing party shall be entitled to an
award of reasonable attorneys fees. However, the failure by any party to enforce any term
or provision set forth in this Agreement shall in no event be deemed a waiver of such
party's right to enforce such term or provision in the future.
13. Acceptance by Grantee . Grantee is signing below to evidence its
acceptance of, and agreement, to all of the terms and provisions hereof. Grantee and
Grantor agree to execute any other documents necessary to effectuate the rights granted in
this Agreement.
15. Governing Law. This Agreement shall be governed by and construed in
accordance with the laws of the State of Minnesota.
-3-
IN' WITNESS VfMREOF, the parties hereto have executed this Easement as of
the day and year first above written.
THE D & Y FAMILY
LIMITED PARTNERSHIP
By
Gilbert M. Darlenwald, General Partner
B �-
Billie V. Darke Bald, General Partner
DARKENWALD' S RIVERBEND
WASTEWATER FACILITY COMPANY
LLP
F. Darkenwald, Partner
By Nnkoup��Deborah e, artner
By
Gilbert R. 3arkenwald, Partner
0
STATE OF MINNESOTA )
) ss.
COUNTY OF HENNEPIN )
The foregoing instrument was acknowledged before me this ;,'� day of November,
2005, by Gilbert M. Darkenwald and Billie V. Darkenwald, the General Partners of The D
& Y Family Limited Partnership, a Minnesota limited partnership, on behalf of the
partnership.
BARBARA JO MIU. A 4➢
N0TARy FUKM-NNK'ESOTA K
ya ,V,y Comm. Exp. Jan. 31, 2010
Notary Public
STATE OF MINNESOTA )
) ss.
COUNTY OF HENNEPIN )
The foregoing instrument was acknowledged before me this 7-15 day of November,
2005, by John F. Darkenwald, Deborah K. Yankoupe and Gilbert R. Darkenwald, the
Partners of Darkenwald's Riverbend Wastewater Facility Company LLP, a Minnesota
limited liability partnership, on behalf of the partnership.
BAR13ARA JO MILLER
N01MY PUBLIC-MIF€,yESOTA
My Comm. F.xp: Jan. 31, 2010
This Instrument was Drafted By:
Courey, Kosanda & Zimmer, P.A.
945 Winnetka Avenue, Suite 200
Golden Valley, MN 55427
(763) 398-0441
4— /
Notary Public
-5-
EXHIBIT A
LEGAL DESCRIPTION FOR BURDENED PROPERTY
A parcel of land located in Wright County, Minnesota, and legally described as
follows:
That part of Government Lots 1 and 2, Section 26, Township 121, Range 23,
Wright County, Minnesota, lying Easterly of the Easterly right of way of State
Highway No. 101; lying Northerly of the Northerly right of way of County
State Aid Highway No. 42; as shown on Wright County Right of Way Plat No.
9; lying Northwesterly of the Northwesterly line of Riverside Evergreens
Second Addition; and lying Southerly of the following described line;
Beginning at a point on the North line of said Section 26 a distance of 979 feet
East from the Northwest corner thereof; thence deflect to the right 45 degrees
20 minutes along the Northerly bank of a creek a distance of 700 feet more or
less; thence continue along said North Bank in a southeasterly direction to the
shore of the Mississippi River and there terminating;
EX'MBIT )B
BENEFITTED PROPERTY
Thatpart of Government Lot 2, Section 26, Township 121, Range 23, Wright County, Minnesota
described as follows:
Commencing at the point where the centerline of County State Aid Highway No. 36
intersects the easterly right-of-way line of State Trunk Highway No. 101; thence South
02 degrees 48 minutes 35 seconds East, assumed bearing, along said easterly right-of-
way line, a distance of 517.59 feet to the point of beginning of the land to be described;
--whence continuing South 02 degrees 48 minutes 35 seconds East along said easterly right-
of-way line a distance of 164.80 feet; thence North 87 degrees 11 minutes 25 seconds
East along said right-of-way line a distance of 65.00 feet; thence South 02 degrees 48
minutes 35 seconds East along said right-of-way line a distance of 700.00 feet; thence
South 87 degrees 11 minutes 25 seconds West along said right-of-way line a distance of
65.00 feet; thence South 02 degrees 48 minutes 35 seconds East along said right-of-way
line a distance of 185.77 feet; thence North 86 degrees 55 minutes 57 seconds East a
distance of 263.84 feet; thence North 79 degrees 23 minutes 42 seconds East a distance
of 91.19 feet; thence North 69 degrees 16 minutes 07 seconds East a distance of 88.85
feet; thence North 60 degrees 35 minutes 32 seconds East a distance of 167.96 feet;
thence North 29 degrees 24 minutes 28 seconds West a distance of 72.61 feet; thence
South 60 degrees 44 minutes 53 seconds West a distance of 40.09 feet; thence North 26
degrees 48 minutes 45 seconds West a distance of 86.07 feet; thence North 58 degrees
44 minutes 21 seconds East a distance of 84.71 feet; thence South 73 degrees 41 minutes
35 seconds East a distance of 194.38 feet; thence North 57 degrees 28 minutes 38
seconds East a distance of 196.79 feet to a point on the westerly right-of-way line of
County Road No. 36 per WRIGHT COUNTY RIGHT-OF-WAY PLAT NO. 1; thence
North 44 degrees 18 minutes 58 seconds West along said westerly right-of-way line a
distance of 343.31 feet; thence northwesterly along said westerly right-of-way line a
distance of 324.47 feet on a tangential curve concave to the northeast having a radius of
1477.84 feet and a central angle of 12 degrees 34 minutes 47 seconds; thence North 31
degrees 44 minutes 11 seconds West, tangent to last described curve, and along said
westerly right-of-way line as per WRIGHT COUNTY RIGHT-OF-WAY PLAT NO. 1
and the westerly right-of-way line as per WRIGHT COUNTY RIGHT-OF-WAY PLAT
NO. 9, a distance of 434.59 feet to the intersection of said westerly right-of-way line,
with a line which bears North 57 degrees 11 minutes 25 seconds East from the point of
beginning; thence South 57 degrees 11 minutes 25 seconds West a distance of 334.97
feet to the point of beginning.
EXCEPT
The northwesterly 70.00 feet thereof.
EY,=rT C
LEGAL DESCRIPTION OF EASEMENT PROPERTY
A strip of land located in Government Lot 1, Section 26, T 121 N, R 23 W, excepting
that portion encumbered by existing County Road 42 and parcel 312 as shown on Minnesota
Department of Transportation Right of Way Plat 86-112, Wright County, Minnesota, which
lies 30 feet westerly and parallel, and 60 feet easterly and parallel to line 1 as described
below:
Line 1: Commencing at the northwest corner of Section 26, T 121 N, R 23
W, thence on an azimuth 126 degrees 23 minutes 21 seconds for 2088.34 feet
to a B comer ]mown as B11 on Minnesota Department of Transportation Right
of Way Plat 86-112; thence on an azimuth 147 degrees 55 minutes 27 seconds
for 106.00 feet to a point in front of a new County Road 42 culvert, said point
is the point of beginning of Line 1; thence on an azimuth 46 degrees 40 minutes
57 seconds for 413 feet more or less to the Mississippi River and there
terminating.
The foregoing described property encumbers 0.85 acres more or less.
EXE-IIRIT D
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Attachment E
Budgetary Proposal
DATE: April 26, 2017 Process Systems Group
10470 Deer Trail Drive
TO: Ashley Hammerbeck, ENV SP Houston, Texas 77038
Phone: (281) 985-4423
COMPANY: Donohue Associates Fax: (281) 449-1324
952.920.1815 Email: michael.yang@alfalaval.com
715.551.3774
Email: ahammerbeck@donohue-associates.com
CC: Joe Getz
Lorna Carter
FROM: Michael Yang
Applications Engineer
SUBJECT: Donohue Associates — Package Plant in MN
QUOTE NUMBER: 41546
In response to your inquiry for a 45,000 gpd wastewater treatment system, we are pleased to
propose one (1) Model H-45-SHUV complete mix activated sludge wastewater treatment
system.
Basis of Design
Average Daily Flow Rate: 45,000 gpd
Peak Hourly Flow Rate: 90,000 gpd
Influent Temperature: 15 °C
Elevation: 600 ft AMSL
Projected Effluent
Influent
Secondary
BODS:
485 mg/L
_< 30 mg/L
TSS:
565 mg/L
_< 30 mg/L
TKN:
50 mg/L
-
Ammonia -N:
35 mg/L
-
Phosphorus -P:
13 mg/L
-
Alkalinity:
300 mg/L
-
pH:
6.5-8.5
Scope of Supply
Aeration Chamber
• One (1) 45,000 gallon aeration chamber
• One (1) in-line comminutor
• Two (2) 20 hp blower motor units, 405 scfm @ 5.23 psig each (1 duty & 1 standby)
• One (1) fixed coarse bubble aeration system, complete with in -basin air piping, 277 SCFM
• One (1) main control panel mounted in NEMA 3R enclosure with magnetic starters, circuit
breakers, programmable time clock, and HOA switches
Clarifier
• One (1) dual 10' L x 10'W hopper bottom gravity clarifier
• Two (2) airlift sludge return pumps and piping
• Two (2) airlift scum return pumps and piping
• One (1) clarifier outlet trough, equipped with adjustable galvanized v -notched weir plates
and scum baffle
Sludge Holding Chamber/Aerobic Digester
• One (1) 26,720 gallon sludge chamber with 30 days of sludge storage
• One (1) supernatant decant airlift assembly
• One (1) fixed coarse bubble aeration system, 111 SCFM
Disinfection
• One (1) ultraviolet disinfection system complete with intensity monitors
• One (1) set of inlet/outlet transition boxes
Corrosion Prevention
• One (1) interior/exterior sand blast, SSPC-SP10/SSPC-SP6, respectively
• One (1) coat of interior/exterior surface protection, Tnemec series 46H-413 Coal Tar Epoxy,
8-10 mils TDFT
Service Walkway
• One (1) lot of 18 gauge galvanized grating, non-skid
• One (1) Lot of painted steel schedule 40 pipe handrails 2 rail with kick -plate
• One (1) 45 degree access stairway with checker -plate stair treads, and painted steel
schedule 40 pipe handrails
Field Service
• One (1) trip to the jobsite
• Five (5) eight hour days total
2
v
Clarifications
Items Not Supplied by Alfa Laval
• Electrical connections and wiring to the control panel
• Site work
• Plumbing to the plant
• Drain valves and piping outside plant walls
• Conduit, wiring and plant lighting
• Concrete foundation and supply/installation of clarifier grout
General Notes
1. Excavation, foundation pad, crane off-loading, field welding, touch-up paint, plumbing to the
plant, connection of anodes, installation of grating, handrail and component equipment,
electrical wiring, and filling of the tank for testing are to be done by the general contractor.
2. There is no provision included in this budgeted price, unless noted, for field erection
supervision, tests, inspections or adjustments of equipment.
3. This secondary system will measure approximately 62.5' long x 24' wide x 11' tall, weighing
approximately 88,000 lbs. empty, and will be prepared for delivery in four (4) sections, the
largest weighing approximately 25,000 lbs., which will require approximately 280 linear feet
of field welding for reassembly, by others.
4. This is a budgetary quotation and it should not be considered binding.
Pricing
Budgetary price, F.O.B. factory, with freight allowed to MN, offloading by
others........................................................................................... $327,000.00
If you have any questions or need any additional information, please do not hesitate to call our
office.
Sincerely,
Alfa Laval, Inc.
Attachments: Activated Sludge Design Output
3
Alfa Laval, Inc.
Activated Sludge Design
Printed: 4/25/2017, 5:39 AM
Project: Donohue, MN #41546
Engineer:
Computed By: Michael Yang
Conditions: Package Plant - Annual Average Conditions
Projected Effluent Quality
(nzg/L):
Influent Characteristics:
Secondaf2Effluent
Flow: 45,000
GPD Ave 90,000
GPD Peak BOD5: <
30
BOD5: 485
mg/L
182
Lbs/Day
TSS: <
30
TSS: 565
mg/L
212
Lbs/Day
TN: <
N/A
TKN: 50
mg/L
* 19
Lbs/Day
TKN: <
N/A
Ammonia: 35
mg/L
* 13
Lbs/Day
Ammonia: <
N/A
Phosphorus 13
mg/L
4.9
Lbs/Day
Phosphorus <
N/A
Alkalinity: 300
mg/L
* 113
Lbs/Day
Alkalinity: <
70
Design Parameters:
Plant Design:
MLSS Temperature:
15
°C *
Number of treatment trains:
1
Site Elevation:
600
Ft. MSL *
Pre -Equalization Volume:
0
Ft' 0
Gal
alpha:
0.85
*
Anaerobic Volume:
0
Ft3 0
Gal
beta:
0.95
*
Anoxic Volume:
0
Ft3 0
Gal
Minimum Residual DO:
2.0
mg/L
Aeration Volume:
6,016
Ft3 45,000
Gal
Total Reactor Volume:
6,016
Ft3 45,000
Gal
Steady -State Operating
Characteristics:
Post Aeration Volume:
0
Ft3 0
Gal
Organic Loading Rate:
30.3
Lb BOD5/d/1000 Ft3
Digester Volume:
3,572
Ft3 26,720
Gal
Total HRT:
24.0
Hours
Disinfection Volume:
0
Ft3 0
Gal
Anoxic HRT:
0.0
Hours
Average Clarifier Overflow Rate:
225
GPD/Ft2
SRT:
7.0
Day
Peak Clarifier Overflow Rate:
450
GPD/Ft2
MLSS:
3,540
mg/L
Clarifier Surface Area:
200
Ft
RAS TSS:
8000
mg/L
Clarifier Diameter:
Hopper
Clarifier
RAS Rate:
0.031
MGD
Est. Thickened WAS conc.:
18,000
mg/L
RAS Rate:
21.2
GPM
Required Digester Storage:
30
Days
WAS Loading:
178
Lbs/Day
VS Reduction in Digester:
34
%
WAS Rate
2,673
GPD
Equalization Air Required:
0
SCFM
Yield Lb WAS/Lb BOD:
0.98
Lb/Lb
Reactor Air Requirement:
277
SCFM
AOR:
11.6
Lbs/Hr
Digester Air Requirement:
111
SCFM
Lb AOR/Lb BOD5:
1.22
Lb/Lb
Airlift Requirement:
17
SCFM
Field Correction Factor:
0.63
Post Aeration Air Req'd:
0
SCFM
SOR
18.4
Lbs/Hr
Blower Discharge Pressure:
5.23
PSIG
SOTE
6.4
%
Total Approx Blower BHP:
14.4
HP
MLSS Recycle Flow
0.00
MGD
Reactor Blower BHP:
10.4
HP
Diffuser Submergence
8.50
Ft
Digester Blower BHP:
3.9
HP
Side Water Depth:
9.5
Ft
NOTE: Reactor is defined
as the sum
of all aeration basins plus
the anoxic basins.
* Value is assumed
D41546 - Donohue, MN
(PP).xlsx
Design
Summary
Page 1 of 1
Attachment F
SITEWORK
To: US SiteWork
Address: 11040 183rd Circle NW, Ste B
Elk River, MN 55330
Project Name: 161662 - Darkenwald's Riverbend Sanitary Treatment System
Project Location: Riverbend Mobile Modular Homes, Otsego, MN
11040183 r6 Circle NW Suite B
Elk River, MN 55330
(763) 280 -8508 -Main
(763) 280 -8506 -Fax
Contact: Bart Anderson
Phone:
(763) 280-8508
Fax:
(763) 280-8506
Bid Number:
161662
Bid Date:
11/9/2016
Line # Item #
Item Description Estimated Quantity Unit
Unit Price
Total Price
1
Mobilization
3.00 LOAD
$589.20
$1,767.60
1.1
SWPPP PERMIT BY DONOHUE
1.00 LS
$1,529.40
$1,529.40
1.2
Soil Borings Prior To Tank Installation
1.00 LS
$5,136.04
$5,136.04
1.3
Surveying
1.00 LS
$1,369.61
$1,369.61
2
Silt Fence - Standard
150.00 LF
$1.71
$256.50
3
Clear & Grub - BY OWNER
0.00 ACRE
$3,300.00
$0.00
4
Strip Topsoil - Dozer 100 FT X 100 FT AREA
370.00 CY
$1.63
$603.10
5
Excavate Footings
520.00 CY
$3.55
$1,846.00
5.1
80 FOOT BY 12 FOOT Concrete SOG AND 12 FOOT
52.00 CY
$456.53
$23,739.56
BY 12 FOOT OPEN VAULT FOR UV TREATMENT
SYSTEM AT 1 FOOT THICK - Vault Elevation Needs
Verification Prior To
5.2
HIRE 120 TON CRANE TO PICK 50,000 LB
1.00 LS
$4,565.37
$4,565.37
ADDIGEST TANK OFF OF TRUCK AND SET ON
SLAB
5.3
Furnish And Install 3/4 Inch Hilti Anchors To Bolt
30.00 EACH
$25.11
$753.30
Down ADDIGEST Treatment System To SOG
5.4
Treatment System Flow Meters
2.00 EACH
$15,408.12
$30,816.24
6
Backfill Footings & ADDIGEST Tank - Assumes
300.00 CY
$12.89
$3,867.00
Granular Soil On Site Is Suitable For Backfilling
Tank
6.1
Testing - Soils
1.00 LS
$570.67
$570.67
6.2
Installation Of ADDIGEST Influent Screen - Option
1.00 LS
$913.08
$913.08
Supplied By Owner - Installation Included Here
6.3
Install 10 Cathodic Protection Anode Bags Supplied
1.00 LS
$570.67
$570.67
From Manufacturer
6.4
Install 6 Inch Mechanical Joint Interconnecting
3.00 LF
$261.72
$785.16
Piping Per S&L Dwg NO B37-0218-1
7
6" SOG Sand Cushion - Onsite Material
23.00 CY
$5.34
$122.82
8
6 INCH THICK Class V For Pavement Areas, Ton -
85.00 TON
$17.50
$1,487.50
ASSUMING A 100 LF BY 10 FOOT WIDE DRIVEWAY
WITH A 10 FOOT APRON AROUND ADDIGEST
TREATMENT SYSTEM
9
Finish Class V
278.00 SY
$0.43
$119.54
10
Finish Grade Green Areas
560.00 SY
$0.43
$240.80
11
Seeding And Mulch
0.25 ACRE
$1,369.61
$342.40
12
NEW 48 INCH Manhole Over Existing Sanitary Pipe
1.00 EACH
$5,322.13
$5,322.13
FOR NEW CONNECTION OF 10 INCH SEWER FEED
PIPE
13
PVC SDR 35 - 10 OUTFLOW PIPE TO NEARBY
200.00 LF
$52.89
$10,578.00
ROAD DITCH
13.1
Riprap OUT FLOW PIPE DITCH INTERFACE
10.00 CY
$110.36
$1,103.60
13.2
Sanitary Testing, LS
2.00 LS
$684.80
$1,369.60
13.3
PVC SDR 35 - 10 SANITARY FEED PIPE FROM
150.00 LF
$52.89
$7,933.50
11/9/2016 11:41:08 AM
Page 1 of 3
Line # Item #
Item Description Estimated Quantity
Unit
Unit Price
Total Price
MANHOLE TO NEW ADDIGEST SANITARY
TREATMENT SYSTEM
14
Supervision
40.00
HR
$111.79
$4,471.60
15
Electrical Service To Treatment System, Hook Up
1.00
LS
$51,360.42
$51,360.42
ADDIGEST, And Also Hook Up UV System
• 400a Service
500' To Utility
Metering
Distribution Panel At 480 And 208
25kva Transformer
See Budget Estimate Clarifications For Additional
Details
15.1
Cabling And Instrumentation For Glasco UV System
1.00
LS
$0.00
$0.00
- By Others - Needs Scope Definition Before Pricing
Can Provided
Currently The System Needs Around An Estimated
213 Watts Of Power
15.2
Lighting, Grounding, And Surge Protection For
1.00
LS
$3,994.70
$3,994.70
ADDIGEST & Glasco UV Treatment Systems
16
On Site Biological Conformance Testing - BY
1.00
LS
$0.00
$0.00
OTHERS
17
Lift, Set, And Install Glasco UV System Into 12 Ft
1.00
LS
$1,712.01
$1,712.01
By 12 Ft Vault
17.1
10 Inch PVC SDR 35 Valve Set Up To Isolation And
0.00
EACH
$0.00
$0.00
Bypass Piping UV Treatment Set Up
UV Sewage Treatment Only Needed During A
Portion Of The Year
17.2
1/2 Inch Stainless Steel Hilti Anchors To Bolt Down
26.00
EACH
$39.95
$1,038.70
UV System
18
Stainless Steel Hand Railing Around 12 Ft X 12 Ft
36.00
LF
$125.55
$4,519.80
UV Treatment System Pit
Could Consider Fiberglass Or Wood Railing Options
18.1
Stainless Steel Access Ladder To UV Pit
1.00
LS
$1,369.61
$1,369.61
18.2
Provide Adequate Ventilation For Treatment
1.00
LS
$0.00
$0.00
System Room. Maintain Less Than 104 Degrees F
To Be Covered Under Building Mini Storage
Construction
19
Transfer Of Existing Lab Equipment Over From
1.00
LS
$0.00
$0.00
Existing Facility To New Facility - By Owner
20
Demolish Pole Building Enclosure Over Septic
1.00
LS
$2,020.94
$2,020.94
System
20.1
Demolish Steel Tanks, Steel Baffles, Steel Cone
1.00
LS
$1,757.03
$1,757.03
Hoppers, Etc. Everything Above SOG
Assumes Steel Is Salvageable, Clean Enough To Go
To Go A Scrap Yard
20.2
Demolish Below Grade SOG(100 Ft X 13.5 Ft),
1.00
LS
$6,699.07
$6,699.07
Chlorine Contact Tank, Outlet Structure
Assumes All Concrete Is Clean And Go To A
Concrete Recycle Crushing Facility
20.3
Load Excess Soil From ADDIGEST Excavation, Haul
220.00
CY
$4.78
$1,051.60
It To The Void Left By Removal Of Existing 1971
Demolished Sanitary Treatment System, And
Backfill Void Left By Demolition
Total Bid Price: $187,704.67
11/9/2016 11:41:08 AM Page 2 of 3
Notes:
• Exclusions:
Bonds, permits, fees, surveying, engineering, testing, soil corrections, rock excavation, dewatering, traffic control, utility or structural sheeting,
shoring, underpinning, buried debris, drain tile, footing insulation or waterproofing, separation fabrics, vapor barriers, drainage layers, class V base
materials, asphalt paving, concrete paving, hazardous materials, haul road or crane road construction, erosion control other than listed above, site
restoration other than listed above, gas, mechanical, or electrical excavation, site fencing, evening, night or weekend work, winter conditions.
Electrical Budget Estimate Scope and Clarifications:
Scope
• 400a service
500' to utility
Metering
Distribution panel at 480 and 208
25kva transformer
• 3 HP flow equalization blower motor
• 15 HP main blower
• Blower controls
• 1hp fine screen
• 15a convenience rec
• 15a UV lighting circuit, Panel and Light connection (materials by others)
• General Lighting in building / shelter
• Float Switch connection
• Float alarm connection
• Control Panel connection / power
• (4) light fixtures
• Lighting control
ACCEPTED:
The above prices, specifications and conditions are satisfactory
and hereby accepted.
Buyer:
Signature:
Date of Acceptance:
CONFIRMED:
U.S. SiteWork
Authorized Signature:
Estimator: Bart Anderson
(619) 916-2296
11/9/2016 11:41:08 AM Page 3 of 3
Attachment G
DRAFT('
J ■ ■
Technical Memorandum
Darkenwald's Riverbend Wastewater Co. LLC Proposed Wastewater
Treatment Facility Review
To: Mr. Kurt Neidernmeier, City of Otsego
From: Jayme Klecker, PE, AE2S
Scott Schaefer, PE, AE2S
Date: October 5, 2016
Project No: P05409-2015-002
1 SUMMARY
The Darkenwald's Riverbend Wastewater Co. LLC currently owns the Riverbend Mobile Home
Park wastewater treatment facility (WWTF) located inside the city limits of Otsego, MN. The
Darkenwald's Riverbend Wastewater Co. LLC is proposing purchasing and installing a new package
WWTF to provide wastewater treatment for its current residents and for a conceptually planned
apartment complex and commercial expansion. The concept plan is dated August 2014.
This Technical Memorandum (TM) reviews the existing facility and discharge permit, the proposed
facilities, and the potential costs and paybacks associated with providing wastewater treatment for
the Riverbend Mobile Home Park.
Based on the analysis conducted in this TM, connecting the existing mobile home park to the City's
wastewater treatment system would provide a simple payback of 4.9 years to the Owners of the
development. If the conceptual apartment complex and commercial expansion were to take place,
the simple payback would be 15.4 years.
This TM is based upon the very limited preliminary information provided by the Darkenwald's
Riverbend Wastewater Co., LLC. The conclusions reached in this TM are based upon that very
limited preliminary information provided and analysis of the same, and are subject to potential
change and revision if additional relevant information is provided.
Riverbend Mobile Home Park WWTF Page 1 of 10
Think Big. Go Beyond. P,, m2s, www.ce2s.com
2 CURRENT CONDITIONS
The private Riverbend Mobile Home Park WWTF was approved, in 1972, to treat an average flow
of 60,000 gallons per day (gpd). The permitted flow capacity was provided to serve specifically
the Riverbend Mobile Home Park. The permit makes no reference to the adjoining or any other
property.
2.1 EXISTING FACILITY
Currently, the Riverbend Mobile Home Park generates approximately 22,000 gallons of
wastewater per day. The wastewater is treated at the Riverbend Mobile Home Park WWTF, and
discharged to the Mississippi River. The Riverbend Mobile Home Park WWTF is located at
Highway 101 and County Road 42 in the City of Otsego. The WWTF received its first discharge
permit from the Minnesota Pollution Control Agency (MPGA) in 1972, and subsequently, has
renewed the permit as required. The most recent permit was issued in 2016.
The current treatment facility is an activated sludge, extended air type of treatment plant. in 2015,
the facility received a certificate of commendation for compliance with its discharge permit.
2.2 DISCHARGE PERMIT
The Minnesota Pollution Control Agency re -issued the facility's National Pollutant Discharge
Elimination System (NPDES) permit (Permit No. MN0042241) in March, 2016. The permit expires
February 28, 2021.
Major permitted components include:
• Preliminary treatment — comminutor
• Activated sludge — extended aeration
• Secondary clarification
• Disinfection (chlorination)
• Dechlorination
• Solids treatment — aerobic digestion
Riverbend Mobile Home Park WWTF Page 2 of 10
Think Big. Go Beyond.(� www.ce2s.com
Permit effluent limits include:
Parameter Limit
C1301) 25 mg/L max month
Sample Frequency
2 x month
Sample Type
Composite
CBOD
30 mg/L max week
2 x month
Composite
Residual Chlorine
0.038 mg/L, Daily
Daily
Grab
Fecal Coliform
200 CFU/100 ml, max
month
2 x month
Grab
Flow
0.06 mgd, max month
Continuous
Continuous
NO2+NO3
Monitor Only
1 x month
(Mar/Sep)
Composite
TKN
Monitor Only
1 x month
(Mar/Sep)
Composite
Dissolved Oxygen
Monitor Only
Daily,
Grab
pH
6 — 9, SU
Daily
Grab
TP
290 kg/yr (10.5 mg/L at 20k
gpd; 3.5 mg/L at 60k gpd)
2 x month
Composite
TSS
30 mg/L max month
2 x month
Composite
TSS
45 mg/L max week
2 x month .
Composite
Other significant requirements/conditions of the permit include:
• Permittee is required to submit a Phosphorus Management Plan 180 days before expiration
of the permit
• The WWTF discharges to an Outstanding Resource Value Water (Upper Mississippi River)
• Biosolids generated from the WWTF must be transferred to another facility for treatment
and ultimate disposal
• The permit does not include an ammonia limit
• The permit allows discharge of a relatively high concentration of total phosphorus
• Discharge permits do not typically address nor convey the "right" to serve an area. The
discharge permit sets the parameters for what is discharged to a Water of the State, the
required system to treat the water, reporting requirements, etc. Other than State designated
entities, such as the Metropolitan Council, Western Lake Superior Sanitary District, and the
Alexandria Lakes Area Sanitary District, the State is not typically involved in service areas.
MPCA considers the availability of treatment capacity For new developments through the
sewer extension permit review process.
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3 PROPOSED CONDITIONS
Darkenwald's Riverbend Wastewater Co. LLC has proposed replacement of the existing WWTF
with a new activated sludge, extended air package plant. The proposed equipment appears to be an
appropriate replacement for the existing system. However, there are questions about both the
intent to serve additional connections and the flow rating relative to the permitted capacity. The
proposed equipment has an average day design capacity of 20,000 gallons per day (gpd); this is
lower than the stated current 22,000 gpd flow generated by the existing Riverbend Mobile Home
Park. Therefore, the proposed equipment does not appear to have capacity accommodate any
future connections (e.g. the new apartment complex). In addition, while the proposed system
should be capable of handling the existing daily flow, and considering the operational attention
that is typical of a small package plant treatment system, the proposed package plant is likely
pushing the upper limit of what this system could be capable of treating on a daily basis for the
existing flow of the Riverbend Mobile Home Park.
For the purpose of this TM, the following assumptions will be made.
• The proposed package treatment system will serve the present development (present
connections). The nominal capacity of the facility will be 20,000 gpd, with capacity to
serve the existing average day flow of 22,000 gpd.
• Additional infrastructure would be required to serve the concept plan development
(concept plan).
3.1 PRESENT CONNECTIONS EQUIPMENT PROPOSAL
The proposed equipment, which will serve the present connections, is from reputable sources. The
proposed system would eliminate chlorination/dechlorination for disinfection and replace it with
ultraviolet (UV) disinfection. For this type of facility, this process is appropriate. However, the
proposed solids treatment is not a true digester; therefore, disposal of solids at another WWTF
would be required.
The proposed system has a listed capacity for a 20,000 gpd average day flow. The proposed
system has a listed capacity for a 60,000 gpd peak flow. This system would not be expected to
handle a 60,000 gpd flow for an extended duration, such as a consecutive 30 -day period (termed
the Average Wet Weather (AWW) flow) that would occur if other users beyond the existing
Riverbend Mobile Home Park were connected to the system.
There is potential that MPCA could consider the proposed WWTF a "derated" facility and reduce
the facility's permitted AWW flow. Reference: littps://www.pca.state.inn.us/sites/default/fiiles/wa-
wwtp5-20.pdf. A reduction in permitted flow could potentially impact the permitted mass
loadings. Significant new construction typically includes a design review, as well as, permit
modification.
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Detailed information on both the proposed Smith and Loveless Addigest extended air activated
sludge package treatment plant and the Glasco UV disinfection equipment are included here:
Smith & Loveless Proposal (Addi?est)
Influent Design
250 mg/L CBOD
250 mg/L TSS
45 mg/L TKN
Average day flow = 20,000 gpd
Peale flow = 60,000 gpd
Effluent Design
<30 mg/L BOD
<30 mg/L TSS
Scope of Supply
Epoxy coated steel tank, 75' L x 12' W x 10' D (individual tank sizes not
provided)(1)
Aeration diffusers
Flow equalization
WAS/RAS airlift pumps
WAS storage
Equalization and main blowers
Controls in Nema 4 enclosure
Equipment Price = $275,000
Fine screen not included, quoted at $45,000
(1) 10' SVJD (approx.), 12' wide. Enti a unit is 75' long, aeration basin length not
provided (assume it is 1/2 of total length 137'1), aeration volume approximately 33,000
gallons (1.6 days at 20,000 gpd).
Glasco UV
Influent Design
Average flow = 45,000 gpd
Peak flow = 70,000 gpd
UVT = 65%
Dosage > 30,000uWs/cm2
Effluent Design
Fecal Coliform < 126 CFU/100 ml
Scope of Supply
4 low pressure high output bulbs
UV monitoring
Stainless steel channel with inlet and outlet boxes
Ballast control center
Equipment price = $11,000
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The proposals appear to be based on general assumptions by the manufacturer's representatives,
and are not site specific. Missing elements from the proposals include the following:
• New NPDES permit application for the new plant.
• Above ground and/or below ground freeze protection
• Chemical equipment for potential TP control
• Site work
• Piping
• Electrical beyond package (transformer, site wiring, etc.)
• ExternalI&C
• Building and HVAC (electrical / UV)
• Excavation and footings
• Site lighting
• Landscaping of the facility site
• Screening dumpster and/or screening building meeting Zoning Ordinance
requirements.
• Odor control
• Generator
• Redundant secondary clarifier (may be required)
• River eutrophication standards requirement for effluent phosphorus. This was not
included in the recently renewed permit. It is unclear if this exclusion was due to
the timing of the permit renewal (recently finalized, standards) or due to these
standards not being considered by MPCA because of the small discharge volume
from the proposed WWTF
3.2 CONCEPT PLAN EVALUATION EQUIPMENT PROPOSAL
The recently submitted Riverbend North Concept Plan proposes to add multiple family (apartment
complex) and commercial connections to the existing Riverbend WWTF. Based on the
information included in the Concept Plan and using Metropolitan Council Environmental Services
(MCES) Sewer Access Connection (SAC) criteria, potential Residential Equivalent Connections
(REC) were calculated.
Multiple Family Dwelling Units (MFDU) = 160 MFDU x l REC/MFDU = 160 REC
1.14 acre commercial lot with 19,830 square foot retail (40% building cover) x I
REC/3,000 sq ft = 6.61 REC
1.84 acre commercial lot with C-store/car wash = 5.5 REC
Total RECs for the Riverbend North Concept Plan equal 172.11 REC. Based on the City of
Otsego REC equivalency factor of 175 gpd REC, the proposed development would generate
172.11 REC x 175 gpd/REC = 30,110 gpd.
The estimated flows from the development outlined in the Concept Plan would be in addition to
the existing 22,000 gpd currently generated at the mobile home park. Therefore, the total
wastewater flow would be approximately 50,000 gpd upon build -out of the Concept Plan.
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4 OPINIONS OF PROBABLE COSTS
In a letter dated September 12, 2016 to the City of Otsego from the Darkenwald's Riverbend
Wastewater Co. LLC, an opinion of probable construction cost for the present connections W WTF
(nominal average day flow of 20,000 gpd) of approximately $500,000 was provided. The cost
opinion was based on general assumptions by the manufacturer's representative and was not site
specific. To develop a more site specific cost opinion, the following cost assumptions were made:
• Partially buried installation (4' of walls above grade). Avoids a building around
package plant and NFPA 820 requirements
• Reuse existing generator (assuming there is an existing generator)
0 Minimal site dewatering
a Slab on grade mounting for UV system
• Fine screen included ($45,000 equipment adder)
• Demolition of old facility, $25,000 (included in site work.)
• 5% of total cost for mobilization, bonds, and insurance
• 10% construction contingencies (lower than usual at this level of planning due to of
the cost being known for the.equipment quote)
• 15% engineering, legal, and administration
• 7.5% tax on purchased equipment
• 10%-15% contractor overhead and profit'(OH&P), varies with line items
5%-40% installation adder, varies with line items
• Proposed equipment assumed capable of meeting permit limits
• No chemical feed needed to meet TP limit
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4.1 PRESENT CONNECTIONS OPINION OF PROBABLE CAPITAL COSTS
Using both the above assumptions and information provided by the equipment manufacturer's
representative, the following opinion of probable capital costs was developed for a facility capable
of treating only the existing mobile home park wastewater flows (nominally 20,000 gpd) and not
additional flows generated by the concept plan for Riverbend North. -
Present Connections Opinion of Probable Capital Costs
Darkendwald Riverbend
Package Plant Opinion of Probable
Description
Cost
Mobilization, Bonds, Insurance
$36,000
Site Work (SW)
$67,000
Addigest S&L (ASL), installed w/footings
$602,000
Ultraviolet Disinfection (UV)
$34,000
Generator and Electrical Bldg (assumed to be none)
$0
Subtotal
$739,000
Construction Contingencies
$74,000
Engineering, Legal, Admin
Opinion of .... - Capital Costs
$111,000
$924,000
4.2 CONCEPT PLAN OPINION OF PROBABLE CAPITAL COSTS
Using the above assumptions and information provided by the equipment manufacturer's
representative, the following opinion of probable capital costs was developed for a facility capable
of treating the Concept Plan wastewater flows (approximately 50,000 gpd). In general, costs were
assumed to increase by the same ratio as the flow increase (2.5 times) in order to increase the
treatment capacity from approximately 20,000 gpd to 50,000 gpd.
Concept Plan Opinion of Probable Capital Costs
Darkendwald Riverbend
Package Plant Opinion of Probable
Description
Cost
Mobilization, Bonds, Insurance
$90,000
Site Work (SW)
$168,000
Addigest S&L (ASL), installed w/footings
$1,505,000
Ultraviolet Disinfection (UV)
$85,000
Generator and Electrical Bldg (assumed to be none)
$0
Subtotal
$1,848,000
Construction Contingencies
$185,000
Engineering, Legal, Admin
Opinion of Probable Capital Costs
$278,000
$2,311,000
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4.3 OPINION OF PROBABLE OPERATION AND MAINTENANCE COSTS
In the previously referenced letter dated September 12, 2016, the following operation and
maintenance costs were provided.
inion of Probable
Utilities
Labor and Sewage Exp _
Repairs/Maintenance
Operations Total Per Year
Operations Per Month
on and Maintenance Costs
$63,567
$828 _--
$76,195
56.350
In general, for the present connections, these estimates seem appropriate for the size and nature of
the treatment facility. However, these estimates were not reviewed in detail as there was
insufficient detail available for review. Additionally, it was not evident if biosolids disposal was
included in these cost estimates. It is important to confirm whether or not biosolids disposal costs
are included for future analysis as the proposed facility cannot accommodate land application of
biosolids.
In order to estimate operation and maintenance costs for the Concept Plan, it has been assumed
that Utilities and Repairs/Maintenance would increase at the same ratio of flow to the facility
(150%). However, because economies of scale exist for labor, it,has been assumed that the "Labor
and Sewage Exp" category cost would increase by 50%. The opinion of probable operation and
maintenance costs for the Concept Plan are provided in the following table.
Opinion of Probable Operation and Maintenance Costs (Concept Plan)
goryPresent
Utilities _ -
Connections
----_— _ $29,500
Labor and Sewage Exp
$95,351
Repairs/Maintenance
$2,070
Operations Total Per Year
$126,921
Operations Per Month
$10,577
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5 REC AND OPERATIONAL COSTS COMPARISONS
The Connection Fee, Sewer Access Charge, and Usage Fees were overestimated in the September
12, 2016 letter due to an apparent misunderstanding of peak vs average flows. After corrections for
"apples -to -apples" cost comparisons, the incremental capital increase (construction vs REC/SAC)
and annual incremental savings (O&M vs utility bill) represent a payback period of 4.9 years for
the present connections and 15.4 years for the Concept Plan. The payback period calculations do
not include analysis of cash flow, borrowing cost for capital expenditures, or development phasing.
The following tables present examples of calculations used to determine City connection cost and
annual wastewater treatment costs for the City providing service to the mobile home park.
See the following tables for a summary of the capital costs, connection costs, annual operational
costs, and payback periods for both the present connections scenario and the concept plan scenario.
Present Connection Cost Comparison
Description New WWTF City Connection
Difference
"Corrected" Capital $924,000 $1,056,361
$132,361
Annual Operational
$76,195 $49,390
-$26,805
Cost
Payback Period, Years
4.9
ComparisonConcept Plan Cost
Description New WWTF City Connection
Difference
"Corrected" Capital $2,311,000 $2,640,439
$329,439
Annual Operational
$126,921 $105,506
-$21,415
Cost
Payback Period, Years
15.4
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Attachment H
Darkenwald"s Riverbend Wastewater Company, LLC
EXPENSES BY VENDOR SUMMARY
January - December 2016
TOTAL
Bob Boutin
150.00
City of Big Lake
7,744.00
City of Buffalo
1,437.32
CliftonLarsonAllen LLP
371.25
Darkenwald Corporation
73.00
Darkenwald's Riverbend Company
-5,000.00
Duane W. Nielsen Co. Inc.
611.00
Duane's Septic Service LLC
4,450.00
Greg Kasin (deleted)
130.00
Harleysville Insurance Co.
321.31
Hawkins Inc.
4,706.99
Mark A. Dixon
930.00
People Service Inc.
42,437.04
Premier Bank
5.00
Robert J. Hiivala Auditor/Treasurer
5,678.00
Wright Hennepin Electric
11,373.96
TOTAL...
$75,418.87
Cash Basis Monday, March 27, 2017 10:26 AM GMT -7 1/1
Exhibit 6
• CONSULTING Table D1
ENGINEERING TRAFFIC FORWARD Forecasted Trip Generation
Weekdav Dailv Volumes
LAND USE ITE
CODE #
DEVELOPMENT
UNITS QUANTITY
DAILY
RATE
ENTER
PERCENT
EXIT
PERCENT
NEW TRIPS
ENTER EXIT
Residential Condominium/Townhouse 230
Units 192.0
5.81
50%
50%
558 558
Mini -Warehouse 151
Units 97.0
2.50
50%
50%
121 121
Total
679 679
AM Peak Volumes
LAND USE ITE
CODE #
DEVELOPMENT QUANTITY
UNITS
PEAK
RATE
ENTER
PERCENT
EXIT
PERCENT
NEW TRIPS
ENTER I EXIT
Single Family Home 210
Units 192.0
0.44
17%
83%
14 70
Mini -Warehouse 151
Units 97.0
0.14
55% 1
45%
7 6
Total
21 76
PM Peak Volumes
LAND USE ITE
CODE #
DEVELOPMENT QUANTITY
UNITS
PEAK
RATE
ENTER
PERCENT
EXIT
PERCENT
NEW TRIPS
ENTER EXIT
Single Family Home 210
Units 192.0
0.52
67%
33%
67 33
Mini -Warehouse 151
Units 97.0
0.26
50% 1
50%
13 13
Total
80 46
NOTES:
1. All trip generation rates based on "Trip Generation", Institute of Transportation Engineers, 9th Edition
unless otherwise noted.
2. A.M. Trip Generation is for the peak hour of adjacent street traffic (one hour between 7 and 9 a.m.).
3. P.M. Trip Generation is for the peak hour of adjacent street traffic (one hour between 4 and 6 p.m.).
PUD Concept Plan Amendment Riverbend North 1 May 23, 2017
DAC16001
S PAC KExhibit 6
Traffic Signal Warrant Analysis
ACADEMY
Warrants 1- 3 (Volume Warrants)
Major Street (N/S Road)
Intersection
River Road
Information
Minor Street (E/W Road)
Site Access
Analyzed with
1 approach lane
Analyzed with
2 or more approach lanes
Total Approach Volume
610 vehicles
Total Approach Volume
46 vehicles
Total Ped/Bike Volume
0 crossings
Total Ped/Bike Volume
0 crossings
Right turn reduction of
0 percent applied
Right turn reduction of
0 percent applied
Reouction applied to volume Warrant thresholds due to high speeds on River Road.
Will
Condition A Condition B
Condition Satisfied?
Not Examined
Condition A Condition B
Condition A+B*
Condition Satisfied?
Required values reached for
-Notiatisfiled
0 hours
Not satisfied
0 hours
Not satisfied
0 (Cond. A) & 0 (Cond. B)
Criteria - Major Street (veh/hr)
350
525
280 (Cond. A) & 420 (Cond. B)
Criteria - Minor Street (veh/hr)
140
70
112 (Cond. A) & 56 (Cond. B)
-)nuwu ue dppueu unit' di Ler an auequare Lnai or outer arternauves Mat couia cause less aeiay ano inconvenience to
traffic has failed to solve the traffic problems.
Condition Satisfied?
Required values reached for 0 hours
Criteria See Figure Below
�ysfrtjcJal��; Irl �tiAi^TrU''!�a`Tf<71[7 �. liC� 1. — - -- -
Condition A Condition B
Condition Satisfied?
Not Examined
Required values reached for
0 hours
Criteria - Total Approach Volume (veh in one hour)
Criteria - Minor Street High Side Volume (veh in one hour)
Criteria - Minor Street High Side Delay (veh-hrs)
650
150 See Figure Below
5
600
T
G 500
O
x
U
cd
Q 400
n
00
x 300
F-
j 200
100
`o
c
0
a
Warrant 2 Threshold
—*--Warrant 3 Threshold
• Intersection Volumes
0 500 1000 1500 2000 2500
Major Street Volume (Both Approaches)
Spack Academy is part of the Spack Enterprise family of companies
S a c k MikeQn S PACK CMUN-irING
traffic ACADEMY cnrs.Eom TRAFFIC DATA INC.
PUD Concept Plan Amendment Riverbend North 2 May 23, 2017
DAC16001