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Upgradienu Environmental COisultants <br /> April 24, 2000 P I V t�.., <br /> Mr. Jeffrey Wong,REHS <br /> PHS/EHD APR 2 8 2000 <br /> P. O. Box 2001 ENVIRONMEN iAL riEALTH <br /> Stockton, CA 95201 PERMIT /SERVICES <br /> Subject: Revised Work Plan for Aquifer Testing <br /> Gillies Trucking <br /> 3931 Newton Road <br /> Stockton, CA <br /> Dear Mr. Wong: <br /> Enclosed you will find a new work plan for conducting an aquifer test at the Gillies <br /> Trucking yard in Stockton. This plan replaces the August 1999 plan and October 1999 <br /> addendum to that plan, and is based on computer simulations of a pumping test using the <br /> computer progam VisualModflow. Based on these simulations,we have scaled back the <br /> previous plan and reduced the anticipated pumping rate. <br /> We have also recently measured the depth to groundwater at the site. Currently,the static <br /> water level is at its shallowest level during the year, making this an excellent time to <br /> perform the test. We would like to perform the test by the middle of May,before the <br /> water level recedes. <br /> Please call our office if you have questions or additional requests. <br /> Sin ere y, <br /> Victor B. Cherven <br /> Principal Geologist <br /> enclosure <br /> Stockton: P.O.Box 8002,Stockton, CA 95208 (209) 772-3620 <br /> Cameron Park: 3369 Kimberly Road, Cameron Park, CA 95682 (916) 677-3055 <br />