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provide a habitat suitable for aquaue plants that will aid in the removal of soluble <br />phosphorous. <br />The basin is configmed into two ceUs and designed to promote plug flow conditions, <br />improving poUutant removal effictency and minimieing maintenance costs. A 1.92 acre <br />wetland fringe ranging from elevation 952.0 - 944 surrounds the open water at 4:1 slope. A <br />summary of the proposed wetland impac-.s and wetland mitigation is presented m Section VI. <br />The basin will not modify th.e existing hydraulics or water levels of the stream. The wet <br />detendon basin/wedand has the foUowing design charactcnsncs: <br />Normal pool elevadon « 950.4 <br />Surface area at elevation 950.4 « 2.5 acres <br />Maximum normal pool depth =■ 10.0 feet <br />Average depth = 6.1 tect <br />Total normal pool volume * 15.2 acre-feet <br />Side slopes = 4:1 <br />n <br />,4m • <br />Sou borings were drUled at seven locations on the site. At each bonng, contmaous split <br />spoon samples were coUected and Shelby tube samples were taken at selected locations and <br />depths. <br />Based on the geotechnical information coUected, the soils in the vicinity of the proposed two <br />ceU basin are adequate to allow for 4:1 basin sideslopes (See Appendix B). <br />One sou sample was composited from 0-14 feet from borings CR 1 through CR 5. A second <br />sou sample was composited from 0-14 feet from borings CR 6 and CR 7. The samples were <br />analyzed for the foUowing categories of chemical compounds: herbiades, metals, pesticides, <br />6 <br />N:«l <br />T