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11/28/2007 Env Bd Packet
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11/28/2007 Env Bd Packet
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Environmental Board
Env Bd Document Type
Env Bd Packet
Meeting Date
11/28/2007
Env Bd Meeting Type
Regular
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standards. The 7.5 acres of the Azure Properties proposed to be developed are <br />on good soils for biofiltration, and filtration for that matter. <br />Site access for maintenance reasons must be shown on the plan for storm water <br />treatment areas. <br />Rice Creek Watershed has issued a CAPROC or conditional approval pending <br />receipt of changes. The changes include permanent signage to be placed every <br />50 feet at the wetland - upland interface where lot backyards abut wetlands. The <br />new biofiltration /surface water treatment approach to managing the site storm <br />water has been submitted to RCWD for further review. <br />Infiltration /biofiltration ponds must be separated from ground water by at least 3 <br />feet. All appear to have this separation. <br />The AUAR specifies that infiltrating or wetland complexes not be more than 6:1 <br />horizontal to vertical side slopes in storm water management areas. The wetland <br />mitigation area of Attachment 10, approximates this slope requirement. I have <br />asked the engineer from Pioneer to look at slope requirements in this area. <br />Plans indicate that wetland soils in the wetland mitigation area be scrapped off to <br />be rid of Reed canary grass. Reed canary is a very vigorous plant that rapidly <br />removes plant diversity by a very aggressive propagation and growth lifecycle. I <br />would suggest a method that has been used by Critical Connections and the City <br />of Lino Lakes for scrapping. The area should be scrapped in the spring or during <br />a winter thaw when the top couple inches of wetland soil is thawed. A skidloader <br />works well for scrapping. Recommend doing the same to the wetland fill sites <br />and salvaging /stockpiling wetland soils for use in the bottom of the wetland <br />mitigation area. <br />Water from the gas station and car wash are filtered through a very good <br />commercial structural bmp (treatment best management practice device) and <br />than sent to storm sewers that empty into pre- designated ponds to the south <br />(constructed in 1998). <br />A P -8 (phosphorous prediction model) analysis was completed for the site and <br />the model shows no net gain in phosphorus leaving the site as per AUAR <br />recommendations. Phosphorous is a chemical element that is directly <br />responsible for increasing algae growth in our lakes. <br />Stormwater Pollution Prevention Plan <br />The Stormwater Pollution Prevention Plan is comprehensive and complete. <br />• <br />• <br />
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