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San Joaquin County <br /> ° '" Environmental Health Department DIRECTOR <br /> o' c Donna Heran,REFS <br /> �'.O <br /> 1868 East Hazelton Avenue <br /> Q. -r PROGRAM COORDINATORS <br /> `�: mlll Stockton, California 95205-6232 Robert McClellon, REHS <br /> 1149:1. ' v Jeff Carruesco,REFS, RDI <br /> Kasey Foley,REHS <br /> • Cq�rFOR�`P Website: www.sjgov.org/ehd Linda Turkatte,REHS <br /> Phone: (209) 468-3420 <br /> Fax: (209) 464-0138 <br /> September 12, 2012 <br /> Randy Coil 00 <br /> Atlantic Richfield Company <br /> 501 Westlake Park Blvd. ' y�'t <br /> WL1-28.160B <br /> Houston,TX 77079 <br /> Subject: ARCO Service Station No. 6100 LOP Site Code: 1708 <br /> 25775 S. Patterson Pass Road <br /> Tracy, California, 95377 <br /> WORK PLAN: Remedial Action Plan <br /> DATED: July 10, 2012 <br /> PREPARED BY: Arcadis U.S., Inc. <br /> APPROVED: [X] <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORK PLAN [H&S 25296.10 (c)(3)]: <br /> 1. To install nine additional air sparge (AS) wells off-site. <br /> 2. The sparge wells will be 2 inches in diameter, advanced to approximately 116 feet bgs, <br /> and will be 30 foot on center from one another. <br /> 3. Utilizing the nine AS wells and other existing wells, design and engineer a soil vapor <br /> extraction/air sparge (SVE/AS) remediation system to perform off-site soil and ground <br /> water remediation.. <br /> 4. Soil will be collected continuously during AS well installation and will be logged for visual <br /> classification and field screened with a PID for VOCs. <br /> 5. After the SVE/AS remediation system in installation and the system is operational, <br /> monitoring will be performance. The initial monitoring will be performed weekly and <br /> bimonthly thereafter. Typical monitoring will include: measurement of the extraction <br /> vapor flow rates and concentrations, measurement of the sparge point flow rates and <br /> pressures. <br /> 6. Arcades will provide final installation and remediation reports to the EHD. <br />