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-- • • <br />water well or wellficld supplying a public water system through which contaminants are <br />reasonably likely to move toward and reach such well or wellficld. The extent of <br />wellhead protection areas for public water supply wells in Colorado is defined in the <br />Colorado Wellhead Protection Program (CDPHE, 1994) and Colorado Source Water <br />Assessment and Protection Program (CDPHE, 2000) plans. The most common technique <br />used by the State to determine WHPAs is finding a 5-year time of travel using simple <br />analytical equations or the semi-analytical WHPA 2.0 model. <br />What is the source water assessment process? <br />The completion of a source water assessment for a public water supply is required under <br />the Safe Drinking Water Act. For the State of Colorado's Source Water Assessment and <br />Protection Program the assessment phase must include four elements: ])delineation of <br />source water assessment azeas for each public water supply, 2) an inventory of significant <br />potential sources of contaminants within the source water assessment area, 3) a <br />determination of susceptibility of the public water supply intake or well to the inventoried <br />contaminants, and 4) active involvement of the public in the three steps above, including <br />public release of the resulu of the assessment. The techniques to be employed by <br />CDPHE in completing the source water assessments are defined in the Colorado Source <br />Water Assessment and Protection Program Plan (CDPHE, 2000). <br />When arc the source water assessments going to be done? <br />Under the Safe Drinking Water Act the State of Colorado is required to complete source <br />water assessments for all public water supply systems within 42 months of EPA approval <br />of the State's program plan. CDPHE's Source Water Assessment and Protection <br />Program Plan was approved by EPA on February ??, 2000. <br />Are there any other potential sources of contamination in the area to be concerned about? <br />EPA, CDPHE. CDNR-DMG -Fill in info <br />The results of the source water assessment for the town of San Luis water supply will <br />include all potential contaminant sources within the delineated source water assessment <br />area. CDPHE has not yet completed an assessment for this public water system. <br />What are the potential contaminants from the mice site snd are there health effects:' <br />At this time the contaminants that are present in ground water within the former pit area <br />are azsenic, iron, manganese, sulfate, and total dissolved solids. Arsenic is regulated <br />under the National Primary Drinking Water Regulations because of human health :asks. <br />Health concerns for arsenic exposure for humans include damage to the skin, impacts on <br />the circulatory and nervous systems, and an increased risk of cancer. Sulfate, which is <br />expected to be regulated under the proposed Sulfate Rule, can cause gastrointestinal <br />upset. Tron, manganese, and total dissolved solids are considered undesirable in drinking <br />~uuo <br />O <br />