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A.-09.00 WED 1J:59 F.43 f~005 <br />~ ~ , ~ ~Y'S,,,~ <br />water well or wellfield supplying a public water system through which conrAr*+;r+~nts are <br />reasonably likely to move towazd and reach such well or wellfield. The extent of ~~ <br />wellhead protection azeas for public water supply wells in Colorado is defined in the <br />Colorado Wellhead Protection Program (CDPI-I)=, 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 Minding a 5-yeaz 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 />r ,.1 <br />'4 1 <br />The completion of a source water assessment For a public water supply is required~under <br />the Safe Drinking Water Act. Por the State of Colorado's Source Water Assesstliient and <br />Protecrion Program the assessment phase must include four elements: 1} dcl~arion of <br />source water assessment azeas for each public water supply, 2) an inventoryr of significant <br />potential sources of contaminants within the source water assessment azea,/_~) a <br />detemunation 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 results 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 are 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 end are there health effects? <br />At this time the contaminants that aze 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 risks. <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. Iron, manganese, and total dissolved solids aze considered undesirable in drinking <br />,. <br />I <br />O <br />°o <br />