5.1. PCSR 07-10-2007 - Laserfiche WebLink

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MEMORANDUM TO: Jeremy Barnhart, Planning Manager FROM: Terry Maurer, City Engineer ~ DATE: June 27, 2007 SUBJECT: Elk River Municipal Utilities proposed well and treatment facility in Twin Lake Estates As requested, we have reviewed the submittal for the proposed well and treatment building to be located in Twin Lake Estates. Based on our review, we would offer the following comments: 1. Twin Lakes Parkway needs to be open cut to provide access to the existing water main and sanitary sewer. The restoration section shown is adequate. However, the plans should indicate that restoration of the street must occur within a reasonable amount of time. It would seem with the placement of concrete curb and gutter and pavement, that full restoration within 7 working days would be possible. Also, a signing plan, which includes a detour around the site during construction, will be necessary. 2. A portion of the existing sidewalk will also need to be removed and replaced. Most of the sidewalk will become part of the driveway into the welUtreatment site. Therefore, the sidewalk needs to be replaced with concrete at least 6 inches thick to support the heavier loads. It may be advisable to construct the portion of the driveway between the sidewalk and the back of curb out of concrete also. 3. The driveway is proposed at 12 feet wide. It skirts an existing wetland on the south side. There is a proposed retaining wall that appears to have a maximum height of approximately 8 feet. Given the height of the wall, a fence on top will be required to protect pedestrians. The fence is shown but is noted as designed by others. The type offence and the installation should be provided in the plans or supplemental submittal. It also appears to be very tight between the wetland, retaining wall and driveway. How will the wall construction proceed without impacting the wetland? Finally, the type of material between the top of the retaining wall and the edge of the driveway is