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ti <br /> One way to avoid sampling this water is to wait for it to flow past the well <br /> The ground water gradient in the area of the Jordan site is approximately <br /> 0.0021 The porosity of silty-sand is 0.2, the permeability is approximately 1 x <br /> 10-1 ft/day. Using Darcy's equation, ground water flows beneath the Jordan <br /> site at the rate of 0 001 ft/day One would have to wait years before the <br /> pressure wave affected water has moved past the well. <br /> A second way to deal with this problem is to remove the affected water <br /> Assume that the water within a 1 foot radius of the well must be removed, <br /> the well screen is 20 feet long, and the soil porosity is 0 2 The volume of <br /> water that would have to bepumped from the well would be approximately <br /> 94 gallons {30 well volumes] Therefore, purging the well of at least 94 <br /> gallons before sampling is sufficient to remove the water affected by <br /> development This latter option is the one that will be employed by <br /> Kleinfelder when we collect samples 24 to 48 hours after development <br /> 4 Location of Sewer Lines - The attached map shows the location of the main <br /> sewer line and lateral with respect to the proposed monitoring well locations <br /> PIease review this letter at your earliest convenience If you have any questions, give me a <br /> call <br /> Sincerely, <br /> KLEINFELDER <br /> Timothy A Crandall <br /> Staff Engineer <br /> Environmental Services Division <br /> Central Valley Group <br /> TAC rmm <br /> cc Bill Jordan <br /> 124-88-1234 <br /> KLEINFELDE=R 9795 Business Park Drive, Suite C, Sacramento, CA 95827 (915) 355-1701 <br />