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Upgradien#Environmental C(Asultants <br /> October 20, 1999 <br /> Mr. Jeffrey Wong, REHS <br /> PHS/EHD <br /> P. O. Box 2001 <br /> Stockton, CA 95201 <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 an expanded and revised version of the Work Plan that we <br /> submitted for your review in August. As you recently requested, we have revised the plan <br /> to more fully describe the proposed test objectives and procedures. We have also revised <br /> the plan to include a"step test", which will immediately precede the main test and provide <br /> information about the optimum pumping rate for the main test. We recently performed a <br /> similar test at a site in Yuba County, and information and graphs that illustrate the success <br /> of that test are included in this work plan. <br /> The information from these tests will be used to calculate the transmissivity and related <br /> parameters of the aquifer. This information will in turn aid in predicting the rate of <br /> groundwater flow and migration oPthe contaminants, deciding whether groundwater <br /> remediation is warranted, evaluating potential remedial methods, designing a suitable <br /> remedial system, and predicting the rate of contaminant removal. Finally,the water <br /> samples obtained will aid in determining how the removed water will be treated and/or <br /> disposed of. <br /> Please call our office if you have questions or additional requests. <br /> Sincerely, <br /> 4�1 <br /> Clyde L. Hebbron <br /> Senior Project Geologist <br /> enclosure _ <br /> Stockton: P.O. Bos 8002,Stockton, CA 95208 (209) 772-3620 <br /> Cameron Park: 1369 Kimberly Road, Cameron Park, CA 95682 (530)677-3055 <br />