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2017-05-10 CC Packet
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2017-05-10 CC Packet
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City of Centerville <br />Donmtowz) Storm Water Redamation Project <br />Gage 1 <br />6/8/10 <br />Pond Water <br />Two samples of the water were taken from the Anoka County Park pond (the one to be used for <br />irrigation). They were gathered from different depths: The first at one (1) foot below the <br />surface of the pond and the second at two (2) feet off the bottom of the pond. These are the <br />extents of the proposed intake locations for the irrigation system. <br />The two concerns with the pond water were: Human health and turf growing implications. <br />Although there are no established standards for irrigation water as it relates to human health, we <br />felt that a comparison to established health standards for swimming beaches and lakes classified <br />by the DNR as Class 2A (Fishing and Swimming) would be an appropriate parallel. <br />For pH and Chloride levels, we have shown standards from the PACE Turfgrass Research <br />Institute to evaluate the water's compatibility with turf grass. <br />In brief the standards and our results are: <br />Pollutant Standard Result (Sample 1) Result (Sample 2) <br />Human Health <br />Fecal Coliform Max 200 CFU/100ml- 74 CFU/100 mL 22 CFU/100 mL <br />Legionella ND CFU/mL ND CFU/mL <br />Arsenic 2.0 ug/L Max Avg. ND ug/L <br />Copper 6.4 - 23 ug/L* Max Avg. ND ug/L <br />Mercury 6.9 ng/L Max Avg. ND ug/L <br />pH 6.5 — 8.5 Standard Units 8.0 Standard Units <br />Chloride 230 mg/L Max Avg. 51.9 mg/L <br />CPAH's <br />Fluoranthene 1.9 ug/L Max Avg. ND ug/L <br />Pyrene N/A ug/L ND ug/L <br />Turf Grass Growth <br />pH 6.5 — 7.5** Standard Units 8.0 Standard Untis <br />Chloride <400 mg/L 51.9 mg/L <br />*Depends on total hardness <br />**Can depend on grass species. <br />ND ug/L <br />ND ug/L <br />ND ug/L <br />8.1 Standard Units <br />52.1 mg/L <br />ND ug/L <br />ND ug/L <br />8.1 Standard Units <br />52.1 mg/L <br />Conclusions — Pond Water <br />Results from the two samples of pond water fall with the established limits for lakes to be used <br />for swimming in the pollutant categories listed above including fecal coliform, heavy metals, pH, <br />Chlorides and PAH's. <br />The samples also showed pH and Chloride levels that are safe for human contact. <br />105 <br />
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