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.: , ~ ~ - <br />INTEROFFICE MEMORANDUM <br />TO: <br />FROM <br />R.A. Mills <br />J.G. Nalven <br />SUBJECT: Yampa Val <br />DATE: <br />1 Co. - Aquifer <br />November 21, 1986 <br />1 001 <br />On November 11, 1986, a slug test was performed on Well 001-SP-7. <br />In addition, an attempt was made to slug test Well 001-SP-6. <br />This test was unsuccessful because the permeability of the spoil <br />aquifer was too high for the slug test method. <br />The tests were performed by displacing a volume equal to 0.24 <br />gallons of water with a bailer. The initial water level was <br />measured with an electric water level indicator for calibration <br />purposes. All other water level measurements were made with a <br />pressure transducer which measures to the nearest 0.01 feet with <br />an accuracy of 0.03 feet. The results of the test were analyzed <br />using the Bouwer and Rice method (1976) and the Papadopulos <br />method (1973). <br />The data and plots for Well 001-SP-7 are presented in Appendix A. <br />The test data indicates that the transmissivity in Well 001-SP-7 <br />is approximately 10 to 20 gallons/day/foot and the permeability <br />is approximately 0.3 gallons/day/square foot. The transmissivity <br />of Well 001-SP-6 is estimated to be in the range of 10,000 to <br />100,000 gallons/day/foot based upon the similarity of response to <br />that obtained in Well 026-SP-2. Due to the small diameter of <br />Well 001-SP-6, additional permeability testing is probably not <br />warranted. <br />JGNjclr <br />Attachments <br />cc: G.A. Trabits <br />Rnhoranroa <br />Bouwer, I{erman, and R,C, Rice; A slug test for determining hydraulic conductivity of unconfined <br />aquifers with completely or partially penetrating wells, Water Resources Res „ 12(3), 423-428, <br />1976. <br />Pa pddoDulos, Sidvf05 S „ John H, Br ed ehoefi, and Rilton h, Cooper, Jr ,; On the analysis of ^slug <br />test~~ data, Water Resources Res „ 9(4 ), 1087-1989, 1973, <br />