ITEM 3.3 Wellhead Protection AmendmentP
CITY
Ot�eoo
MINNESOTA V
DEPARTMENT INFORMATION
Request for
City Council Action
ORIGINATING DEPARTMENT:
REQUESTOR:
MEETING DATE:
Utilities
Kurt Neidermeier, Utility
April 28, 2014
No
Operators Supervisor
Barr Engineering Company, at the September 23, 2013 Otsego City Council meeting was approved to
PRESENTER(s):
REVIEWED BY:
ITEM #:
Consent
Lori Johnson, City Administrator
3.3
AGENDA ITEM DETAILS
RECOMMENDATION:
The Public Works Subcommittee has reviewed scope changes for the Wellhead Protection Amendment
at the April 15th meeting and recommends approval.
ARE YOU SEEKING APPROVAL OF A CONTRACT?
IS A PUBLIC HEARING REQUIRED?
No
No
BACKGROUND/JUSTIFICATION:
Barr Engineering Company, at the September 23, 2013 Otsego City Council meeting was approved to
complete Part 1 of the Wellhead Protection Amendment. The Scope of Work includes Data Compilation
and Pre -delineation Meeting, Wellhead Protection Area delineation, Drinking Water Supply
Management delineation, Well and Aquifer Vulnerability Assessment and Final Reporting at a project
cost of $12,165.
The Pre -Delineation Meeting was held March 31St with Barr Engineering and the Minnesota Department
of Health (MDH). Discussions included recently released information by the MN Geological Survey
identifying bedrock faults in Otsego. Due to impact on water supply areas, the MDH is requiring the
faults be incorporated to the Wellhead Protection Plan and flow evaluations be performed as part of the
delineations. Incorporation of the faults, additional cross sections and fracture flow evaluations are
beyond the original scope of work requiring additional costs.
Barr Engineering Company provided a detail of scope changes and prepared an estimate not to exceed
$3,200 to complete the additional work. Staff agrees the scope of work has changed and is outside of
the original proposal recommending Barr Engineering Company conduct the work requested. Funding
for the service is available through the water operations fund.
SUPPORTING DOCUMENTS: X ATTACHED
• Proposal: Part 1 Wellhead Protection Plan —Scope Changes
POSSIBLE MOTION
Please word motion as you would like it to appear in the minutes.
Motion to approve the agreement for Scope Changes to the Wellhead Protection Plan Amendment with
Barr Engineering Company.
BUDGET INFORMATION
FUNDING: BUDGETED: X YES — 2014
Water Operations Fund
ACTION TAKEN
❑ APPROVED AS REQUESTED ❑ DENIED ❑ TABLED ❑ OTHER (List changes)
COMMENTS:
resourceful. naturally. BARR
engineering and environmental consultants
April 3, 2014
Mr. Kurt Neidermeier
Utility Operations Supervisor
City of Otsego
13400 901h Street N.E.
Otsego, MN 55330
Re: Part 1 Wellhead Protection Plan — Scope Changes
Dear Mr. Neidermeier:
As we discussed during our April 2 phone call, the Pre -Delineation Meeting for the Otsego Part 1
Wellhead Protection Plan (WHPP) amendment with Dr. Amal Djerrari from the Minnesota Department of
Health (MDH) was held on Monday, March 31. Barr proposed at the meeting to use Metro Model 2 as the
base model for delineating the wellhead protection areas (WHPAs) for the Otsego wells since the
Metropolitan Council has not yet released the new Metro Model 3 for use in projects such as this.
During the Pre -Delineation Meeting, the presence of faults in the bedrock beneath Otsego shown in the
new Wright County Geologic Atlas (released by the Minnesota Geological Survey on October 31, 2013)
was discussed. (Note that the presence of these faults was not addressed in the City's 2004 Part 1 WHPP.)
The faults are shown on Figure 1 below:
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-b
FigumI
BEDROCK SUBGROP
Otsego WHPNI ment
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Barr Engineering Co. 4700 West 77th Street, Suite 200, Minneapolis, MN 55435 952.832.2600 www.barr.com
Mr. Kurt Neidermeier
Utility Operations Supervisor
April 3, 2014
Paae 2
In order to address the faults and account for their potential effects on groundwater flow and well capture
zones and the resulting WHPA delineations, Dr. Djerrari indicated that MDH would require the following
for the Part 1 WHPP amendment:
Incorporation of the faults into Metro Model 2 by adding hydraulic conductivity zones along the
fault alignments.
• Performance of a fracture flow evaluation as part of the WHPA delineations.
In addition, Dr. Djerrari is also requiring that new geologic cross sections be included in the Part 1 WHPA
amendment. The new cross sections are being required because:
1) The geologic cross sections in the 2004 Otsego Part 1 WHPP do not include the faults and
2) The size of the new WHPAs to be delineated for the plan amendment will likely be larger and of
different shape than the original WHPAs delineated in 2004 due to the fracture flow evaluation.
Each of the new MDH requirements identified above are beyond the scope of work presented in our
October 8, 2013 proposal to the City. Specifically, the new MDH requirements contradict some of the
assumptions associated with our proposed scope of work that are presented on pages 7 and 8 of our
October 8 proposal. Additional work to update the groundwater flow model, perform the fracture flow
evaluation, and prepare new geologic cross sections will be required to meet the new MDH requirements.
We estimate that the cost associated with the additional work will not exceed $3,200.
If the scope changes and associated costs discussed above are acceptable to the City of Otsego, please
sign and date in the space below. Keep one copy of this letter for your records and return a copy to Barr
Engineering Co. If you have any questions please call me at 952-832-2774.
Sincerely,
BARR ENGINEERING COMPANY
By
Brian K. LeMon
Its Vice President
Accepted this day of 2014
CITY OF OTSEGO
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