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Scope of Work <br />Upper Mountain Counties Water Needs Assessment <br />are mapped, this study will attempt to determine if flzere are any potential long term <br />water supply concerns based on tlle location of known alluvial wells fronl the DWR <br />data base. These estinlates will be showll on GIS overlay maps for the four counties. <br />The authors of the USGS study in the Turkey Creek watershed will be consulted to <br />see if flley can assist u1 properly using the report to estinlate recllarge for various <br />aquifer systems, specifically Cliff Bossong and Jonathan Saul Cau1e. It nlay be <br />necessary to conduct some random sanlpling of fractures in outcrop areas to compare <br />with the fractures found in the Turkey Creek watershed study. Ot11er experts <br />ulvolved u1 the study sucll as Mike Wireman with tlle EPA, Ed Weeks wit11 the USGS, <br />and Peter Barknlann with the CGS should be consulted or used as an advisory <br />conlnuttee. <br />Peti.irn flows fronl on-lot sewage disposal systenls will be estinlated usuzg <br />information available from DWR and the Colorado School of Mines studies. In <br />addition, any localized inlpacts upon runoff and related recllarge to aquifer systems <br />due to land use activities need to be evaluated and if necessary, nutigation activities <br />such as retention basuls proposed. <br />Task 4Assuyttptions <br />^ It is assumed that for Task 4.1 data will be available in the fornl of a nlap that <br />indicated long-ternl average precipitation and that this infornlation will not be <br />recreated using historic data. <br />^ Existing geologic nlaps for the study area will be used and at the snlallest scale <br />unifornlly available. <br />^ The USGS Report (Water Pesources Investigations Peport 03-4034) estinlates long <br />term recharge (1949 to 1999) for four types of aquifer systenls; metamorpllic, <br />uztrusive, fault-zone, and Pikes Peak granite, and this recharge estinlates will be <br />used for sinlilar rock types in t11e study area. <br />^ Tl1e counties will identify areas wllere inlpervious surfaces have inlpacted runoff <br />and possibly recharge. <br />Task 4 Deliverc~bles <br />^ Aiuzual and seasonal precipitation estinlates for the four counties with GIS <br />overlays. <br />^ Geologic nlapping for the four counties along with GIS overlays. <br />^ Estimates of long ternl annual recharge to the various aquifer systems for t11e four <br />counties along with GIS overlays. <br />^ Mitigation activities suc11 as detention basins to increase recharge u1 areas where <br />land use patterns from inlpervious surfaces have inlpacted rwloff and related <br />recharge to the aquifer systems. <br />C:\Documents and Settings~~owannc\Desktop\To File Back\UMGSOW-rv4.doc <br />