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<br />~~~~ UNITED STATES ENVIRONMENTAL PROTECTION AGENCY <br />~~ REGION 8 <br />~ y 99918TM STREET -SUITE 500 <br />DENVER, CO 80202-2166 <br />http:lhrww.apa.govlregion08 <br />Ref: 8EPR-EP <br />January 18, 2000 <br />Ms. Kathleen Reilly <br />Outreach and Assistance Unit <br />Water Quality Control Division <br />Colorado Department of Public Health and Environment <br />4300 South Cherry Creek Drive <br />Denver, Colorado 80246-1530 <br />RE: Recommendations for Ground-Water <br />Monitoring in the San Luis Area <br />Deaz Ms. Reilly: <br />As per your request, I have looked into the ground-water flow system in the vicinity of <br />the Town of San Luis with regard to the potential for impacts to the town's public water supply <br />wells fiom potential conra*r+;na~t sources as prioritized by the locals. In addition to the <br />information that you forwarded to me I was able to locate a few reports on the San Luis Valley <br />that included discussions on the hydrogeology of this area and was able to hack down the records <br />of permitted wells in this area. <br />I will provide a discussion of my findings on the hydrogeology and ground-water usage in' <br />the area and recommendations to the San Luis Water and Sanitation District (SLWSD) for <br />monitoring the Town of San Luis' source water for the protection of human health. <br />HYDROGEOLOGY AND LOCAL GROUND-WATER USAGE <br />The Town of San Luis lies within the Culebra Re-Entrant section of the San Luis Valley. <br />Within the upper 1000 feet below land surface in this area of the Culebra Re-Entrant the land is <br />underlain in descending order by recent alluvial deposits, the Alamosa Formation, the Servilleta . <br />Formation, and the Santa Fe Formation. The primary source of ground water in this azea is the <br />shallow Alamosa Formation, an unconsolidated unit comprised of sands and gravels with clays. <br />In areas at depth within this formation relatively continuous clay units aze present that provide for <br />confined aquifer conditions. Based on the information acquired, it is believed that the two wells <br />~Pn'nfed on Recycled Papa <br />