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