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2017-05-10 CC Packet
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2017-05-10 CC Packet
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atyofCenterwIle Page 4 <br />Downtown Storm Water Redamatbn Project 6/8/10 <br />Balifield Soil <br />Two samples of soil were taken from the outfield areas of the LaMotte Paris balifields (the ones to <br />be irrigated). <br />Soil samples from the balifield areas were taken primarily to establish background levels of <br />certain pollutants. This will help us as we monitor the operation of the system moving forward. <br />For instance, if the grass begins to have trouble, we can again take soil samples and determine if <br />the levels of a certain compound are elevated over what they were before we began irrigating. <br />Then we can address that particular problem rather than having to guess which pollutant is the <br />issue. Additionally, if there was a human health concern, we'd be able to know whether or not it <br />is directly related to the irrigation system. The idea being that if the levels of contaminants in <br />the soil at the time the issue arises are no different than they were before the irrigation project <br />was installed, it would be difficult to point the finger at the system. <br />Below are some excerpts from various authorities outlining the background levels of certain <br />contaminants in typical soils or the levels which can be tolerated without risk to human health. <br />From the MN Department of Health Website: <br />Levels of arsenic in soil from 5 ppm up to 20 ppm (5-20 mg/kg) are generally viewed as <br />safe, even if contact with arsenic at these levels continues for many years. If the level <br />of arsenic in soil is within this range, the potential for any health effect is very small. In <br />fact, contact with arsenic in soil even somewhat above these levels will likely have no <br />health effects. However, if levels do exceed this range, another risk assessment may be <br />done that looks specifically at the site being evaluated to determine what level will be <br />safe for that particular situation. <br />From the U.S. Department of Health and Human Services, Public Health Service; Agency for Toxic <br />Substances and Disease Registry (ATSDR). <br />Copper is a reddish metal that occurs naturally in rock, soil, water, sediment and air. Its <br />average concentration in the earth's crust is about 50 parts copper per million parts soil <br />(ppm or mg/kg). Copper also occurs naturally in plants and animals. It is an essential <br />element for all known living organisms including humans and other animals. <br />From the U.S. Department of Health and Human Services, Public Health Service; Agency for Toxic <br />Substances and Disease Registry (ATSDR). <br />Normal soil levels [of Mercury] range from 20 to 625 parts of mercury per billion parts <br />of soil (20-625 ppb; or 20,000-625,000 ng per kilogram of soil). A part per billion is one <br />thousand times bigger than a part per trillion. <br />From the PACE Turfgrass Research Institute, below are desired ranges for Chloride and pH. <br />Chloride <400 mg/kg <br />pH 6.5 - 7.5 standard units <br />107 <br />
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