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ENVIRONMENTAL HEALTH DEPARTMENT <br /> PpU1N ' SAN JOAQUIN COUNTY <br /> Unit Supervisors < <br /> Donna K. Heran, R.E.H.S. <br /> c a Carl Bor man, R.E.H.S. <br /> y Direcror 304 East Weber Avenue, Third Floor g <br /> Mike Huggins, R.E.H.S., R.D.I. <br /> ' Al Olsen, R.E.H.S. Stockton, California 95202-2708 Douglas W. Wilson, R.E.H.S. <br /> • Fq, . 7�' Program Manager Telephone: (209) 468-3420 Margaret Lagorio, R.E.H.S. <br /> c� F66 Laurie A. Cotulla, R.E.H.S Robert McClellon, R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 - <br /> Mark Barcellos, R.E.H.S. <br /> DAVID ATWATER <br /> VAN DE POL ENTERPRISES <br /> P 0 BOX 1107 <br /> STOCKTON CA 95201 <br /> RE: Pacific Pride <br /> 3147 S. El Dorado Street <br /> Stockton, CA <br /> WORKPLAN: Work Plan Addendum to the FeaaikQ ry Studies and Monitoring Well Jnrfallarion Work Plan <br /> DATED: June 18. 2003 <br /> PREPARED BY Advanced Ge-Environmental. Inc. <br /> APPROVED X <br /> DISAPPROVED ❑ <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN [Health & Safety Code (H&S) <br /> Section 25299.37(c)(3)] : <br /> 1 . The work plan includes installation of one groundwater extraction well, two soil vapor extraction <br /> wells, one air sparge well, and one ozone sparge well, but the immediate work includes only the <br /> installation of two on-site groundwater monitoring wells, MW-8 and MW-9, and two off-site <br /> monitoring wells, MW-10 and MW-11 . MW-8 will have screen intervals at depths between 65 <br /> and 70 feet below surface grade (bsg), 95 and 100 feet bsg, and 120 and 125 feet bsg. MW-9 will <br /> have screen intervals at depths between 30 and 40 feet bsg, 65 and 70 feet bsg, 95 and 100 feet <br /> bsg, and 120 and 125 feet bsg. MW-10 and MW-11 will have screen intervals at depths between <br /> 30 and 40 feet bsg, 70 and 75 feet bsg, 95 and 100 feet bsg, and 120 and 125 feet bsg. <br /> 2. San Joaquin County Environmental Health Department (EHD) recommends that MW- 10 be <br /> relocated approximately 10 to 15 feet in the direction of boring P-10. This will place MW-10 in a <br /> position that is down gradient to MW-7, a monitoring well with high contaminant concentrations. <br /> 3 . EHD recommends installation of one additional multi-level groundwater monitoring well (MW-12) <br /> to evaluate the vertical and lateral extent of impacted groundwater by 1 ,2 dichloroethane. MW-12 <br /> should be located northwest instead of northeast of soil boring P-8 due to space constraints, with <br /> recommended multi-level screen intervals at depths between 30 and 40 feet bsg, 70 and 75 feet <br /> bsg, 95 and 100 feet bsg and 120 and 125 feet bsg to correspond with the four potential <br /> hydrologic units identified during the cone penetrometer testing. <br /> 4. The proposed multi-level well construction diagram presented for MW- 12 will be corrected to <br /> show that the bentonite seal will go from 40 to 68 feet, the filter pack will go from 68 feet to 75 <br /> feet, followed by a bentonite seal from 75 to 93 feet. <br /> 5 . Soil samples will be collected for logging purposes at five-foot intervals, beginning at five feet bsg. <br /> I <br />