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RE( WED JUN 2 0 2001 <br /> PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY r �- <br /> z <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor ° Stockton, CA 95202 `'FORS' <br /> 209/468-3420 <br /> STEPHEN VALENTINE <br /> STEVE & GENES SERVICE <br /> 6232 HEMET AVE <br /> STOCKTON CA 95207 <br /> RE: STEVE &GENES SERVICES SITE CODE:2080 <br /> 2315 N EL DORADO ST <br /> STOCKTON CA 95204 <br /> WORKPLAN: WorkPlan for Vertical Investigation DATED: August 23,2000 <br /> PREPARED BY: Geological Technics,Inc. <br /> 19, APPROVED with Conditions (See Below) Approval of this work plan is <br /> valid only if the conditions are met. <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN(H&S 25299.37,subd.(c)(3).): <br /> 1. Installation of a single soil boring using mud rotary to approximately 150 feet bsg.The same boring is <br /> to be converted to a discretely screened(approximately 147.5 feet to 150 feet bsg)monitoring well <br /> MW-201 for the purpose of evaluating'the vertical extent of the contamination. <br /> 2. The boring will be continuously logged from 110 feet bsg to final depth at 150 feet bsg. 5 soil samples <br /> are to be collected using 6.0 inch brass liners. <br /> 3. Groundwater samples will be collected using SimultProbe at depths of suitably coarse grained strata. <br /> COMMENTS AND CONDITIONS: <br /> 1. Continuously core the boring using acetate sleeve from 110 feet bsg to 150 feet bsg. Selection of the <br /> monitoring well screen section should be based on the field data and USCS descriptive log of this <br /> visual continuous core. <br /> 2. Must have additional slotted PVC sections on hand in the event that the targeted discrete geological <br /> strata is significantly thicker than the proposed 2.5 feet of MW-201's screen section. Generally,the <br /> screen section of a totally penetrated monitoring well below the shallow aquifer should span the entire <br /> thickness of the strata targeted for the monitoring well. <br /> 3. The workplan proposed using 0.020" slot size for the screen section of the monitoring well,but the <br /> attached diagram indicated.0.010"slot size is to be used for the screen section. PHS/EHD <br /> recommends maintaining a supply of different size slot PVC sections during the construction of the <br /> monitoring well. Selection of the PVC slot size should be based on the grain size of the strata where <br /> the well screen is set at. Communicate with PHS/EHD this decision before scheduling any work <br /> 4. The work plan did not specify the schedule size of the PVC to be used for the monitoring well. Due <br /> to the exothermic heat and pressure from the setting of 145 feet of cement/bentonine grout, <br /> PHS/EHD recommends consulting with the manufacturer on the specifications and tolerance of the <br /> PVC schedules. Communicate with PHS/EHD on the decision before scheduling any work <br /> REASONS FOR DISAPPROVAL OF THE WORKPLAN(H&S 25299.37,subd.(Q(3).): <br /> None <br /> DATED Lune 14,2001 BY <br /> Cc: CRWQCB,Central Valley Region— ll <br /> Cc: Geological Technics,Inc.—Joseph Angulo <br /> A Division ofa <br /> S n Joaquin County Health Care Services <br />