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San Joaquin County DIRECTOR <br /> o D N Donna Heran, REHS <br /> oP Environmental Health Dep„ artment <br /> ASSISTANT DIRECTOR <br /> rT — 600 East Main Street Laurie Cotulla, REHS <br /> mStockton , California 95202 -3029 <br /> � - � PROGRAM COORDINATORS <br /> - Carl Bergman, REHS <br /> - Mike Huggins, REHS, RD[ <br /> CQki OR �\P Website: www.sjgov. org/ehd Margaret LLagoro, REHS <br /> Phone: (209) 4683420 Robert McClellon, REHS <br /> Fax: (209) 4644138 Jeff Carruesco, REHS, RDI <br /> Kasey Foley, REHS <br /> DON PRATT <br /> ATLANTIC RICHFIELD COMPANY May 29 , 2007 <br /> PO BOX 1257 <br /> SAN RAMON CA 94583 <br /> RE : Arco Station #2130 Site Code 1094 <br /> 7906 N . EI Dorado St, RO#: 035 <br /> Stockton , CA, 95210 <br /> WORKPLAN : Addendum to Work Plan for Additional Assessment <br /> DATED: May 5 , 2007 <br /> PREPARED BY: Secor International = Rusty Benkosky, P . E . <br /> STATUS : APPROVED with conditions noted below. <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN [Health & <br /> Safety Code ( H&S ) Section 25296 . 10(c)(3 )1 ' <br /> • Install six (6) shallow screened (30 '-50 ' bgs ) , first ground water <br /> monitoring wells " MWA4, 115116 , 17, 21 & 22" on and offsite as <br /> required by the SJCEHD for continued lateral plume investigation <br /> and , <br /> • Install three (3) mid range screened (60 '-75 ' bgs) monitoring wells <br /> " MW-181 199 & 23 "on and offsite as required by the SJCEHD for <br /> vertical plume definition and , <br /> f Install one ( 1 ) deep screened (90 '-100 ' bgs) monitoring well " MW- <br /> 20 " onsite as required by the SJCEHD in the `core ' area of the <br /> petroleum plume for deep vertical definition . <br /> • Collect and analyze a minimum of two soil samples from each boring <br /> for TPHg , TPHd by 8015m and BTEX and fuel oxygenates and lead <br /> scavengers by 826013. <br /> • Develop, survey in , and add new wells to existing quarterly <br /> monitoring . <br /> t <br /> • Submit a report of findings to EHD. <br /> COMMENTS AND CONDITIONS : <br /> • include lead and EDB laboratory analyses for selected soil samples . <br /> i. <br /> ti <br />