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PUBLIC H?ALTH SERVI(__ r'S PaU N. <br /> SAN JOAQUIN COUNTY r' <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 4C FpPN` <br /> 209/468-3420 <br /> Ken Gillies <br /> Gillies Trucking <br /> PO Box 8303 <br /> Stockton CA 95208 <br /> WORKPLAN: REVISED WORK PLAN FOR AQUIFER TESTING DATED: October <br /> 20, 1999 <br /> PREPARED BY. Uoeradient Environmental Consultants <br /> ❑ APPROVED with Conditions (The approval of this workIan is voided if you do <br /> not agree to the conditions <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN(1-186 <br /> 25299.37,subd.(c)(3).): <br /> 1. Perform a 5-hour step-test bypumping extraction well GT-10 at different rates to <br /> determine sustainability of the well at different pumping rates. The test will start at <br /> about 4 gallons per minute (gpm) and increase in 4 gpm increments at 1-hour <br /> intervals. <br /> 2. Collect groundwater samples at each pumping rate to be submitted to a certified <br /> laboratory for analyses. <br /> 3. Conduct a 12-hour constant rate (based on the result of the step test) pumping test <br /> to determine draw-down effect and other aquifer parameters, and to determine the <br /> feasibility of a pump and treat remediation system <br /> COMMENTS AND CONDITIONS: <br /> 1. Must provide transducers (or similar automated level-logger type apparatus) at the <br /> extraction well and the observation wells during both pump tests. <br /> 2. Conduct minimally,the 5-hour step-test no later than July 31, 2001 before <br /> groundwater elevation begins to fall again. It is your responsibility to obtain pre- <br /> approval from the State Clean Up Fund (the Fund) before performing this test. <br /> Inabilityor delay in obtaining pre-approval from the Fund is not an excuse for <br /> postponing the proposed work plan <br /> 3. Conduct the 12-hour step test no later than August 20, 2001 <br /> REASONS FOR DISAPPROVAL OF TI-M WORKPLAN(H&S 25299.37,subd.(Q(3).): <br /> None <br /> DATED I1Q ZOO �OoI BY <br /> Cc: CRWQCB, Central Valley Region—Marty Hartze I C7� <br /> C Fax: Upgradient Environmental Consultants—Victor Chervin <br /> A Division of San Joaquin County Health Care Services <br />