ITEM 4.1_attachmentMain Office:
1 1akanson 3601 Thurston Avenue, Anoka, MN 55303
Anderson Phone: 763/427-5860 Fax: 763/427-0520
www.haa-ine.com
Memorandum
TO: Planning Commission/City Council
BY: Ronald J. Wagner, P.E., City Engineer
CC: Lori Johnson, City Administrator
Dan Licht, City Planner
Tami Loff, City Clerk
Kurt Neidermeier, Utilities Manager
Dan Schmidt, Sathre Berquist
Dan Berning, Ziegler Custom Homes
Jeffrey and Kelly Busch, 12830 43rd St NE St. Michael MN 55376
DATE: February 10, 2016
RE: Riverpointe 6th Addition — Review
We have reviewed the Preliminary Plat and Final Plat for Riverpointe 6th Addition for conformance to
City standards and have the following comments:
Preliminary Plat
1) Driveway grade exceeds maximum driveway grade allowed. Maximum grade allowed is
10%. Driveway as shown on preliminary plat is approximately 12%.
2) The site plan must be revised to provide for a nearly flat turnaround at house so that someone
does not have to back down a steep, curving driveway in the winter.
3) Retaining walls on either side of driveway and around the house exceeds 4' in height. A
protective fence is required by the Building Code along the high side of any retaining wall
exceeding 4'. Retaining walls in excess of 4' are required to be designed by a professional
engineer licensed in Minnesota. Protective barriers along the driveway retaining walls, on
down slope side, are suggested due to grade and width of travel surface.
4) Two culverts are shown providing drainage under the driveway. Storm water calculations
determining sizing for culverts must be submitted for review and approval by the City
Engineer. Size, type and inverts of existing utilities within 150' of the project boundary must
be shown on the preliminary plat.
5) A driveway profile showing watermain service line and sanitary sewer service line is required
in the final plans. Sewer service line shows no clean outs along approximately 500' of length.
The utility plan must be revised to provide cleanouts at all bends and at least midway the
length of the service. The utility plan must also indicate type, size and grade of service line.
6) The utility plan must show watermain type and sizeand analysis must be completed to ensure
existing City pressure is adequate per size of watermain. (i.e. that the pressure at the house is
still adequate after checking headlosses associated with 500' of smaller conduit and a rise of
approximately 30 ft.
2/11/2016
Page 2
7) Cross sections of the driveway and retaining walls is required and are subject to approval of
the City Enigneer.
8) Typical section of driveway is required and is subject to approval of the City Engineer.
9) Temporary and permanent erosion control is required to be shown. A NPDES permit would
be required if over 1 acre is disturbed.
10) Outlot A has no functional purpose and the preliminary plat is to be revised to combine Outlot
A with Lot 1 to create a single parcel.
Final Plat
1) Ingress/egress and utility easement over Outlot A would be required if ever sold to another
party.
2) Drainage easement is required along waterway channels. There are two waterway
channels within the subject site; one running NW to SW under driveway across both
Outlot A and Lot 1 and one along the north easterly portion of Lot 1.
3) A 20' conservation easement along the wetland is required. Conservation easement signs
(wetland buffer) are required at intervals which indicate the approximate line and can be
seen from one to the next.
4) The drainage and utility easement along the west property line must be 10' rather than 5'
when adjacent to unplatted property.
5) Outlot A is to be combined with Lot 1, Block 1 to create a single parcel.
Recommendation
Many items need to be shown and analyzed. The exceedance of driveway slope has merit due to the
uniqueness of the site. As long as the owners are aware of the issues regarding the steep slope and
potential safety and accessibility issues in adverse weather conditions I would advise allowing it. At
this point we cannot recommend approval due to the number of items that need addressing prior to
Planning Commission consideration of the applicaiton.
Hakanson
1,16IIAnderson