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<br />. <br /> <br />. <br /> <br />. <br /> <br />3 <br /> <br />Conservation Board (CWCB). Extensive core-analyses work undertaken by the USGS in the late <br />1980's at Castle Pines, Co., was cooperatively funded by CWCB through the Colorado Division <br />of Water Resources (CDWR). Both CWCB and CDWR recognize the importance of collecting <br />critical aquifer data particularly when the work can be undertaken economically and in <br />conjunction with ongoing studies. <br /> <br />Reference pertaining to USGS work at Castle Pines include: <br /> <br />Robson, S.G., and Banta, E.A., 1993, Data from core analyses, aquifer testing, and <br />geophysical logging of Denver Basin bedrock aquifers at Castle Pines, Co.: U.S. <br />Geological Survey Open-File Report 93-442, 94 p. <br /> <br />Robson, S.G., 1993, Techniques for estimating specific yield and specific retention from <br />grain-size data and geophysical logs from clastic bedrock aquifers: U.S. Geological <br />Survey Open-File Report 93-498,19 p. <br /> <br />Robson, S.G., and Banta, E.A., 1990 Determination of specific storage by measurement <br />of aquifer compression near a pumping well: Ground Water, V. 28, No.6, pp 868-874. <br /> <br />If I can be of further assistance in this matter, please feel free to contact me at (303) 236-4882, <br />ex1ension 305. <br /> <br />Sincerely, <br />~~~ <br /> <br />Stan Robson <br />Hydrologist <br />