SITE INFORMATION AND CORRESPONDENCE_FILE 1

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San Joaquin County Environmental Health Department DIRECTOR _ 2 600 East Main Street Donna Heran, REHS a ,StocktonCalifornia 95202-3029 r PROGRAM COORDINATORS Margaret Lagorio,REHS Robert McClellon,REHS Cq P O R N`P Website: www.sjgov.org/ehd Jeff Carruesco,REHS, RDI Phone: (209)468-3420 Kasey Foley, REHS Fax: (209)464-0138 November 17, 2009 4d-d Mr. Michael Karvelot f}q/q e fir!✓u tnr Ant Quik Stop Markets, Incorporated -t C:d 4567 Enterprise Street L_ FrA Fremont, California 94538 i9g/ re,14or AYc /Y/ovrtar'M r?el-1 e Subject: Quik Stop Market No. 132 95/0 5/0 3555 West Hammer Lane Stockton, California 95209 The San Joaquin County Environmental Health Department (EHD) has reviewed Additional Investigation Work Plan — 2nd Addendum, dated November 4, 2009, prepared by ATC Associates Inc. (ATC) for the above,-referenced site on your behalf. The work plan was submitted in response to an EHD letter dated September 24, 2009, concerning the locations for advancing soil boring SB-4 and installing monitoring well MW-11, and the well construction of MW-11. ATC has illustrated the proposed locations for SB-4 and MW-11 in Figure 1 of the second addendum work plan. The EHD approves the relocation of SB-4 approximately thirty feet southeast of monitoring well MW-3, and MW-11 adjacent to soil boring ATC-5. Although ATC proposes to install MW-11 using a combination drill rig equipped with eight- inch-outer-diameter hollow stem augers and direct push technology, there is no mention of advancing the borehole using the eight-inch-outer-diameter hollow stem augers. ATC states that a nominal one-and-a-half-inch diameter borehole will be advanced to a depth of approximately twenty-five feet below surface grade while collecting soil samples at five- foot intervals for lithologic logging and field screening. The work plan states that upon completion of the soil boring, MW-11 will be constructed with a five-foot screen of 0.020- inch slotted Schedule 40 two-inch diameter polyvinyl chloride. One must assume that upon completion of the advancement of the initial one-and-a-half-inch soil boring and prior to constructing the well, the borehole will be over-drilled using eight-inch-outer-diameter hollow stem augers. Also, the EHD recommends you use Number 3 sand instead of 2/20 Monterey sand for the sand pack since the well screen consists of 0.020-inch slotted Schedule 40 casing. Please submit a boring permit application and permit/inspection fee of $434 to the EHD and complete the approved fieldwork by February 1, 2010. Notify the EHD of pending fieldwork at least a week prior to the scheduled date.