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t, <br />� I <br /> I <br /> mom <br /> 1 <br /> Brown and Caldwell <br /> Consultants <br /> ,23 5 Street <br /> Sacramento <br /> Caldorn a 95814dU92 <br /> 19161444-0123 <br /> Fax(916)44»•8437 <br /> October 9, 1991 <br /> Mr. Chuck Catrnel <br /> ARCO Products Company <br /> 2000 Alameda de las Pulgas <br /> post Office Box 5811 017-5590-41/1 <br /> San Mateo,Califontla 94402 <br /> Subject: Status of Grounriwater Extraction System, ARCO Station 2133, <br /> Stockton,California <br /> Dear Mr, Carmel: <br /> This letter presents the current status of the groundwater extraction system and the results of the <br /> groundwater discharge sampling at ARCO Products Company (ARCO) Station 2133,located at <br /> 2908 Benjztmin Holt Drive in Stockton, California. Listed chronologically below is a summary <br /> 6 throgh <br /> of the activities related to the discharge of groundwater at the site from August axtractracts <br /> September 15, 1991. Table i presents a summary of the detected constituents fur the etion <br /> system. <br /> 8121191 Collected effluent water sample for laboratory analysis of total petroleum hydrocarbons <br /> (TPH) and benzene, ethylbenzene, toluene, and xylenes (BE X) <br /> 9111f91 Sampled extraction system for BM and TPH. <br /> The average daily flow during this reporting period(31 days)was approximately 10.1 gallons per <br /> minute. The total now for this period was 451,000 gallons. <br /> e poun-la per day of each constituent dieeharged to the <br /> The€ollowing calculations show averagI <br /> sanitary sewer. <br /> W <br /> Q _ Average flow rate,gpm <br /> C _ Concentration, pgA <br /> W Average amount of chemical dischargeu,lbs/day <br /> W Q x 1,440 x 8.34 x CI(1,000,000,000) =0.000123 C for Q= 10.1 gpm <br />