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Howard Ft, Green Gomp ny <br /> <br />May 10, 2004 <br />File: 812622J-0240 <br /> <br />Mr. Scott Harlicker <br />Senior Planner <br />City of Elk River <br />13065 Orono Parkway <br />Elk River, MN 55330 <br /> <br />RE: PULLMAN PLACE <br /> <br />Dear Mr. Harlicker: <br /> <br />As requested, we have reviewed the revised submittal for the proposed Pullman Place <br />development in the Elk River Station development. The revised information was provided by John <br />Oliver & Associates and dated April 28, 2004. It consisted of revised drainage calculations and <br />revised site drawings. Based upon our review, we would offer the following comments: <br /> <br />The drawing showed the outlet from the ponds in the southeast corner at an elevation of <br />883.0. The pond bottom is approximately 878.0. Unless infiltration and/or evaporation <br />lower the water level, the pond will have a normal water level of 883.0. However, the <br />pond modeling assumes an empty pond and an elevation of 878.0 at the start of the <br />storm. This is incorrect; the modeling should be rerun, assuming an 883.0 pond <br />elevation at the start of the storm. This will have the net effect of raising the high water <br />level (HWL) and the peak discharge into the existing storm sewer system. <br /> <br />The pond in the northeast corner of the site has the normal water level (NWL) <br />mislabeled. It is shown at 886.0 higher than the HWL. This needs to be corrected. <br /> <br />in response to our last set of comments, which indicated the pond's average depth was <br />too shallow to facilitate the required treatment, Mr. Campbell from John Oliver & <br />Associates indicates that the average depth of the northeast basin is 1.35 feet and the <br />average depth of the southeast basin is slightly more than 2.5 feet, which is the best <br />that he can accomplished on the site. Given this information, the developers may want <br />to consider lining the ponds below the NWL to maintain the aesthetics of standing water <br />in the ponding areas. With these shallow depths, it is highly likely that the ponds will dry <br />out and be unsightly much of the time. <br /> <br />The watermain loop from 171s~ Lane to 172n~ Avenue across the road in front of <br />Pullman Place needs to be eight inches in diameter. It is currently shown as a six-inch <br />watermain. <br /> <br />Ltr-501004-Harlicker,doc <br /> <br />2550 University Avenue West · Suite 400N · St. Paul, MN 55114 · 651/644-4389 fax 651/644-9446 toll free 888/368-4389 <br /> <br /> <br />