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R t. <br /> San Joaquin County DIRECTOR <br /> a rN Donna Heran, REHS <br /> Environmental Health Department ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla,REHS <br /> `{ Stockton California 95202-3029 <br /> T ► PROGRAM COORDINATORS <br /> • Carl Borgman, REHS <br /> Website: www.s ov.or /ehd Mike Huggins,REHS, RDI <br /> FOR�� 19 9 Margaret Lagorio,REHS <br /> Phone: (209) 468-3420 Robert McClellon,REHS <br /> Fax: (209)464-0138 ,teff Carruesco, REHS, RDI <br /> Kasey Foley,REHS <br /> SHELBY LATHROP SEP 17 2007 <br /> CONOCOPHILLIPS COMPANY <br /> 76 BROADWAY <br /> SACRAMENTO CA 95818 <br /> RE: 76 Service Station No. 11193 <br /> 3202 West Hammer Lane <br /> Stockton, California <br /> San Joaquin County Environmental Health Department (EHD) has been notified that the <br /> City of Stockton is making road improvements at Kelley Drive and West Hammer Lane <br /> and as a result MW-12, located in the sidewalk on the east side of Kelley Drive, must be <br /> destroyed. To prevent road construction delays, please submit a work plan immediately to <br /> EHD for the destruction of MW-12. Note that monitoring wells in areas of contamination <br /> may only be destroyed by removing all of the well contents by drilling out the original <br /> borehole and filling it with grout using a tremie pipe or equivalent. <br /> EHD has reviewed Work Plan for Vertical and Lateral Delineation dated August 30, 2007, <br /> prepared and submitted by SECOR International Incorporated (SECOR) for the above- <br /> referenced site on your behalf. EHD directed SECOR to submit such a work plan to <br /> investigate the lateral extent of impacted groundwater down-gradient of monitoring wells <br /> MW-11 and MW-12, and the vertical extent of impacted groundwater onsite near cone <br /> penetration testing (CPT) borings CPT-1 and CPT-2. <br /> In the work plan SECOR proposes the installation of one deep groundwater monitoring <br /> well located approximately midway between MW-3 and MW-9, and two off-site <br /> monitoring wells, one located in the sidewalk on the east side of Kelley Drive <br /> approximately 100 feet north of MW-12, and one located adjacent to the sidewalk on the <br /> north side of West Hammer Lane approximately 200 feet southeast of MW-12. <br /> SECOR will not be able to install the two proposed monitoring wells along Kelley Drive <br /> and West Hammer Lane at this time. Upon completion of the road construction, please <br /> submit an amended work plan based on current site conditions. <br /> EHD approves the installation for the deep monitoring well located onsite. Stratigraphy <br /> will be continuously logged from approximately 100 feet below ground surface (bgs) to <br /> total depth (approximately 110 feet bgs) based on the depth of the water-bearing zone <br /> consisting of coarse-grained soil. Although it is not stated, EHD assumes the screen <br />