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San Joaquin County DIRECTOR <br /> PdulN Environmental Health Department Donna Heran,REHS <br /> p ASSISTANT DIRECTOR <br /> r.' 600 East Main Street Laurie Cotulla,REHS <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> •': - Carl Borgman,REHS <br /> Mike Huggins, REHS, RDI <br /> Website: www.sjgov.org/ehd Margaret Lagorio,REHS <br /> �lFQR <br /> Phone: (209)468-3420 Robert McClellon, REHS <br /> Fax: (209) 464-0138 Jeff Carruesco,REHS,RDI <br /> Kasey Foley,REHS <br /> ARTHUR L WYATT JR <br /> 6265 CROOKED STICK <br /> STOCKTON CA 95219 <br /> RE: FORMER ARCO AM/PM SITE CODE: 1216 <br /> 4511 PACIFIC AVENUE <br /> STOCKTON CA <br /> WORKPLAN: Soil Sampling Location (confirmation borings)—Addendum DA'Z'ED:August 7.2007 <br /> PREPARED BY: Advanced GeoEnvironmental,Inc. (AGE.) <br /> APPROVED <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN (H&S 25296.10(c)(3)): <br /> 1. Install 5 confirmation soil borings on site to a depth of approximately 50 feet beneath surface <br /> grade (bgs) to assess remnant hydrocarbon concentrations and determine if continuing remedial <br /> operation is necessary. <br /> 2. Soil samples will be collected a five-foot intervals beginning at a depth of 5 feet bsg as <br /> described in the workplan. <br /> COMMENTS AND CONDITIONS: <br /> 1. Implement proposed work to install 5 confirmation borings by October 14,2007. <br /> 2. The workplan proposes a rebound test for the soil vapor extraction (SVE) operation. Submit a <br /> workplan to EHD for conducting the rebound test.-EHD`approves shutting down the SVE <br /> system for preparation of the rebound test. <br /> 3. EHD will also consider the reduction of monitoring well sampling frequencies for selected <br /> monitoring wells on site. Submit a revised monitoring well sampling program with proposed <br /> sampling frequencies for each monitoring well. <br /> 4. After analytical results for the soil samples have been received,EHD recommends that a mass <br /> estimate of the remaining contamination be prepared and compared to the extraction rate of <br /> the SVE system. <br /> REASONS FOR DISAPPROVAL OF THE WORKPLAN (H&S 25296.10(C)(3)): <br /> None <br /> DATED September 5, 2007 BY 4Z.-e—k <br /> Cc: CRWQCB, Central Valley Region—James L. L. Barton, RG <br /> Fax: Advanced GeoEnvironmental, Inc. —Bill Little <br />