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r�r <br /> n <br /> gown ani Caldwell <br /> Consuitants <br /> 723 5 5ireet <br /> Sacramento <br /> Caiifornia 95814 7692 <br /> 916)444 0123 <br /> FAX(916)44-18437 y " r V <br /> February 20, 1992 <br /> FEB 2 4 1992 <br /> E-NVIRONM NTAL EALTI"t <br /> Mr Chuck Carmel PERMIT/.$ERNICES <br /> ARCO Products Company <br /> 2000 Alameda de las Pulgas <br /> Post Office Box 5811 <br /> San Mateo, California 94402 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 2n Stockton, Califorrna Lasted chronologically is a summary of the <br /> activities related to the discharge of groundwater at the site from December 16 through January <br /> 15, 1992 Table 1 presents a summary of the detected constituents for the extraction system to <br /> date <br /> I <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 /> 1/22/92 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 per minute The average <br /> daily flow was 6,270 gallons The total volume of water discharged during the period was <br /> 195,000 gallons <br /> The following calculations show average pounds per day of each constituent discharged to the <br /> sanitary sewer The quantity of hydrocarbons being discharged as an compliance with the City <br /> of Stockton Wastewater Discharge Permit Issued for this site <br /> Q Average flow rate, gpm <br /> C Concentration, µg/1 <br /> W — 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 Qpm <br /> 6673\CORRESP`667304 LIR <br />