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2.6 Environmental Analysis <br /> WSB engineering was re- <br /> tained to provide an assess- <br /> ment of the current water qual- <br /> ity in Silver Lake and to con- <br /> duct an analysis of the lake's <br /> watershed to determine the <br /> degree to which runoff from <br /> the Apache Plaza site contrib- <br /> utes to water quality problems <br /> in the lake. The following is a <br /> summary prepared by WSB '_ �' ■ <br /> based on a water quality study <br /> that was undertaken for Silver r <br /> Lake by the Ramsey County , k <br /> Public Works Lake Manage- <br /> Oil&l - <br /> $: <br /> ment Program in May 2000. <br /> The watershed of Silver Lake <br /> is 629 acres in size and bro- <br /> ken up into 10 subwatersheds. ' <br /> The results of the study indi- <br /> cate that: a <br /> • tp <br /> the total phosphorous <br /> and total suspended <br /> solids loading is very <br /> high in the lake S "�°� °° + SILVER LAKE <br /> g WSB WATER QUALITY SUMMARY <br /> • the largest pollutant 0.2 os. o..Mlbs . <br /> u ,., <br /> contributor is the <br /> Stinson subwatershed <br /> followed by the 42"d St. subwatershed, direct runoff from surrounding properties, ■ <br /> and then the Apache subwatershed <br /> • lake water quality has improved over the past 15 years.This can be attributed to a <br /> number of factors, including ponding improvement on the Apache site and treat- <br /> ment ponds constructed in the northern portion of the watershed <br /> • while improving, water quality remains poor <br /> Recommendations for improvement of water quality include: <br /> ® implementation of best management practices, including improved street sweep- <br /> ing and catch basin cleaning <br /> identifying possible ponding locations for untreated portions of subwatersheds <br /> ® pond maintenance ■ <br /> evaluating use of lakescaping treatments <br /> ® continued monitoring <br /> Northwest Quadrant Redevelopment Plan St. Anthony Village Page 2.8 <br />