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r <br /> Sr"EMCO <br /> ENVIRONMENTAL & GENERAL ENGINEERING CONTRACTOR. <br />' LICENSE # 449864 A, B, C611D40,HAZARDOUS CERTIFICATION <br /> 1217 So 7th STP&ET,MODESTO, CALIFORNIA 95351 (209) 52.4-9653 <br /> (209)524-9653, 1FAX# (209)524-0503 <br /> 1 <br /> September 1, 1995 <br /> Michael Infurna, Senior REHS <br />' Site Mitigation Unit <br /> San Joaquin County <br /> Environmental Health Division <br /> P O Box 388 <br /> Stockton, CA 95201-0388 <br /> Re Langston Arco, 15615 S Seventh St , Lathrop, CA 95330 <br /> Subject Ground Water Discharge <br /> Dear Michael, <br /> This letter is intended to be a formal request for approval to discharge filtered ground water <br /> to sanitary sewer During excavation/remediation activities at the above referenced site <br /> ground water has been pumped from the open excavation into temporary above ground <br /> storage tanks The stored water was then pumped through carbon canister filters into clean, <br /> epoxy lined storage tanks (see attached diagram) This filtered water has been sampled and <br /> analyzed per City of Manteca requirements for industrial waste water discharge for TPH-Gas, <br /> BTEX, and Lead The attached analysis reflects this water to be non-detected for all <br /> r analyzed constituents <br /> 1 Upon approval from City of Manteca, and City of Lathrop Public Works Departments, Semco <br /> proposes to discharge the filtered water from the 10,000 gallon tank storage tank to sewer <br /> Discharge rates will be monitored and regulated per city requirements Upon discharge of the <br /> initial filtered water other stored water will be filtered, sampled, and approval for discharge <br /> will be requested on a tank by tank basis <br /> If you should have any questions lease contact me at 209 524-9653 or di ital pager at <br /> q F ( ) y € P g <br /> (209) 520-6625 <br /> Sincerely, <br /> CDoug Flaming, <br /> Semco <br /> I <br />