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f ENVIRONMENTAL HEALTH DEPARTMENT <br /> �0 . 1, SAN JOAQUIN COUNTYUnrt Supervisors <br /> Donna K Heran,R.E H S304 East Weber Avenue, Third Floor Carl Borns,R R E x s <br /> Director <br /> Mike Huggins,R E H S,R D I <br /> ' Al Olsen,"H S Stockton, California 95202-2708 Douglas W Wilson,R E H S <br /> oq `P Program Manager Telephone (209) 468-3420 Margaret Lagorio,R E H S <br /> IF:OF Laurie A Cotulla,R.E H S Robert McClellon,R E N S <br /> ' Program Manager Fax (209) 464-0138 Mark Barcellos,R E H S <br /> ' DAVID ATWATER RECEIVED <br /> VAN DE POL ENTERPRISES <br /> P O BOX 1107 <br /> STOCKTON CA 95201 <br /> ' RE Pacific Dude <br /> 3147 S El Dorado Street <br /> Stockton,CA <br /> ' WORKPL-NN Work Plan Addmdum to the Fear k§ Sturlier ard Momtenng Well tallatron Work Plan <br /> DATED June 1$.2003 <br /> PREPARED BY_Advcmeed Geo Envair9nmental.Inc <br /> ' APPROVED X <br /> DISAPPROVED ❑ <br /> ' ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPL-�N [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 ofbonng P-10 This wnLl place MW-10 ina <br /> ' position that is down gradient to MW-7,a momtonmg 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 drehloroethane MW-12 <br /> ' should be located northwest instead of northeast of soil boring P-8 due to space constraints,wrath <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 />