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Fatilm- I& <br /> IN _ Viz. � <br /> B!"4Dwn and Caldwell <br /> Consultants <br /> :23 S sm-m <br /> Sacramento <br /> C40crnia 45814-7042 <br /> 3r51444•p123 <br /> r;.X r31Et 44sd3;il ' <br /> November 8, I991 <br /> Mr. Chuck Carmel <br /> ARCO Products Company <br /> 2000 Alameda de las Pulgas <br /> Post C,-xice Box 5811 <br /> San Mateo, California 94402 017-5690-0311 <br /> Subject: Status of Groundwater 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 Benjamin Holt Drive in Stockton, California. Listed chronologically below is a summary <br /> of the activities related to the discharge of groundwater at the site from September 16 through <br /> October 15, 1991. Table I presents a summary of the detected constituents for the extraction <br /> system. <br /> 9125191 Collected effluent water sample for laboratory an of total petroleum <br /> hydrocarbons (TPH) and benzene, ethylbertzene, toluene, a:,d xylenes (BETX) and <br /> metals. <br /> 1019191 Sampled extraction system for BETX and TPH. <br /> The average daily flow during this reporting period (30 days) was approximately 10.1 gallons <br /> per minute. The total flow for this period was 4.36,000 gallons. <br /> The following calculations show average pounds per day of each constituent discharged to the <br /> sardtary sewei:. <br /> Q — Average flow rate, gpm <br /> roncentrati-M .Vrll <br /> W — Average amount of chemical discharged, lbs/day <br /> W — Q x 1;440 x 8.34 x C/(1,000,0OO,Oioo) = 0.000123 C for Q= 10.1 gpm <br /> C:'3690uwsrp U..169003.1 <br />