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ISO Drawn ana Caidwet! <br /> 4t <br /> r <br /> February 20, 1992 <br /> FEB 2 !t 199? <br /> Chuck Carmel r-L.i;i,l r `I. <br /> ARCO Products Company <br /> 2000 Alameda de Ias Pulgas <br /> Post Office Box 581I <br /> San Mateo, Califomir. 94402 <br /> 017-6673-04/1 <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 is a summ of the <br /> i., activities related to the discharge of groundwater at the site from December 16 through January, <br /> 15, 1992. Table I presents a summary of the detected constituents for the extraction system to <br /> date. <br /> 12/20/91 System restarted after being off for repairs since November 5, 1991. <br /> 1/8/92 Collected effluent water sample for laboratory analysis of total toxic organics <br /> (EPA Method 624 and 625),total petroleum hydrocarbons(TPH),and benzene, <br /> ethylbenzene, toluene and xylenes (BETX), and metals. <br /> 1/-2/92 Collected effluent water sample for analysis of BETX and TPH. Results will <br /> be included in the next monthly report. <br /> The average flow rate during this period (31 days) was 4.4 gallons <br /> daily flow was 6,270 gallons. The total volume of water discharged during thcTh` average <br /> 195,000 gallons. g period was <br /> Tile following calculations shote average pounds per day of each constituent discharged to the <br /> sanitary sewer. The quantity of hydrocarhons being discharged is in <br /> of Stockton Wastewater Discharge Perrotcomplisutre with the Ci[v <br /> issued for this site. - <br /> Q = Average flow rate, gpm <br /> W Concentration, pg/l <br /> Average amount of chemical discharged, lbs/day <br /> W = Q x 1.440 x 8.34 x C/(1,000,000,000) =0.0001 C for Q= 4.4 gpm <br /> r�antoxxrs�raya�u.�yu <br />