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L � <br /> San Joaquin County DIRECTOR <br /> Donna Heran,RENS <br /> P41'" . Environmental Health Department ASSISTANT DIRECTOR <br /> Laurie Cotulla,REHS <br /> 600 East Main Street <br /> Stockton, California 95202-3029 <br /> � PROGRAM COORDINATORS <br /> A <br /> , Carl Borgman,REHS <br /> Mike Huggins,REHS,RDI <br /> cP.• Website: www.sjgov.org/ehd Margaret Lagorio,REHS <br /> FORc <br /> Phone: (209) 468-3420 Robert McClellon,RENS <br /> Fax: (209) 464-0138 Jeff Carruesco,REHS,RDI <br /> Kasey Foley,REHS <br /> JENNIFER C. SEDLACHEK <br /> EXXONMOBIL REFINING AND SUPPLY COMPANY <br /> 4096 PIEDMONT AVENUE#194 <br /> OAKLAND,CA.94611 <br /> RE: Former Exxon Retail Site 7-3942 SITE CODE: 2231 <br /> 4444 North Pershing Avenue <br /> Stockton,CA <br /> WORK PLAN: Risk Assessment and Well Installation Work Plan <br /> DATED: March 13,2007 <br /> PREPARED BY: ETIC <br /> APPROVED: [XI <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORK PLAN[H&S 25296.10(c)(3)1: <br /> 1. To complete a boring to collect soil and groundwater samples of chemical analysis. Based upon <br /> sample results, install one MW (deep)down-gradient of the on-site source area approximately 50 feet <br /> below ground surface(bgs). Groundwater from the deep MW will be monitored and sampled to <br /> determine the vertical extent of groundwater contamination. <br /> 2. To complete 5 soil borings to approximately 15 feet bgs and collect soil samples for potential laboratory <br /> analysis. <br /> 3. To install 5 shallow vapor wells to 6 feet bgs. <br /> 4. To analyze soil and groundwater for:TPH-g (EPA Method 8015B), BTEX(EPA Method 8260B),and <br /> gasoline fuel additives(EPA Method 8260B). <br /> 5. To analyze soil vapor samples for TPH-g, BTEX, and gasoline additives using appropriate EPA <br /> methods. <br /> COMMENTS AND CONDITIONS: <br /> 1. Sample results for soil,soil vapor, and groundwater must be compared to the San Francisco Bay <br /> Regional Water Quality Control Board Environmental Screening Levels (SFBRWQCB, ESL's). <br /> 2. Two EHD permit applications, one for the off-site MW in COS right of way and one for the on- <br /> site borings and soil vapor sampling wells, are required and fees ( $89.00 per app.) must be <br /> submitted. <br /> 3. When EHD permits are issued,work can be scheduled and inspections will be performed. <br /> 4. All reports need to be submitted to GeoTracker and hard copies to James Barton at <br /> CVRQWCB for review and possible comment. <br /> DATED 4I U/ o7 BY 1 ` -" - ` <br /> Harlin Knoll,Senior REHS (209)468-3442 <br />