12/03/2003 Env Bd Packet - Laserfiche WebLink

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• • The City's engineering consultant, SEH, Inc., is preparing the Master Surface Water Management Plan. The plan is being designed in accordance with National Urban Runoff Program (NURP), Rice Creek Watershed District (RCWD), and City of Lino Lakes, design standards. Storm water runoff will be treated through infiltration areas and retention ponds. The plan is proposing to utilize underground treatment chambers for infiltration purposes As with past projects, infiltration is a desirable practice if ground water pollution is mitigated by establishing at least 3 feet of sand separation between the bottom of the infiltration area and the seasonally high ground water table. This requirement can be met on the site. A P8 (phosphorous) analysis will be performed to demonstrate phosphorous loading reduction to George Watch Lake.. Best management practices for surface water quality should be initiated and integrated into the predicted phosphorous exports for the site. Best management practices should include periodic and timely sweepings to capture sediment laden phosphorous on impervious surfaces. A vacuum type sweeper is a better tool for removing phosphorous deposits on impervious surfaces. Best management practices should also include the elements sited in the plan for Market Place north of 35W. ttManagement/Housekeeping Practices/Target Sife These are used primarily in urban areas to keep impervious areas clean and are most effective when applied on a continuous basis either year round or seasonally depending on the nature of the problem. These controls are likely to reduce pollutants by 25 -50 %. Individual practices include: • Street Sweeping • Street Maintenance • Collection System Maintenance • Catch basin cleaning • Storm sewer flushing • Litter Control • Chemical Application reduction • Deicing materials • Pesticides and fertilizers • Safe Chemical storage improvement The entire area is in a Lino Lakes Environmental Handbook as a Lake Protection Area with the Tamarack swamp to the West a high priority protection area and buffer area to George Watch Lake. Treated water from the site will flow through a degraded tamarack swamp. There may be some opportunity in the future to restore this swamp in the future by working with Anoka County. The ditch that drains the swamp is North of the Village site. The ditch cuts through the basin