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BC <br /> Brown and Caldwell <br /> Consultants I V <br /> E 0 <br /> KL6 <br /> ?23 S Street 9 C T 2 6 ung <br /> . Sacramento <br /> Callomia 95814-7092 <br /> (916)444 0123 ENVIRONMENTAL HEALTH <br /> Q <br /> FAX(916)444 8437 f�EM IT/51:RVI ID�cq <br /> October 22, 1992 <br /> Mr Chuck Carmel <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 <br /> . the groundwater discharge sampling at ARCO Products Company (ARCO) Station 2133, <br /> located at 2908 Benjamin Holt Drive in Stockton, California. Listed below is a chronological <br /> summary of activities related to the discharge of groundwater at the site from August 16 <br /> through September 15, 1992 Table 1 presents a summary of the detected constituents for the <br /> extraction system to date (The complete laboratory reports for this reporting period are <br /> included in Attachment A) <br /> 8/26/92 Collected effluent water sample for laboratory analysis of total petroleum <br /> hydrocarbons (TPH), and benzene, ethylbenzene, toluene and xylenes (BETX) <br /> 9/9/92 Collected effluent water sample for laboratory analysis of TPH, BETX, and metals. <br /> The average flow rate during this period (31 days) was approximately 3.1 gallons per minute <br /> (gpm). The average daily flow was 4,464 gallons. The total volume of water discharged <br /> during the period was 138,600 gallons. <br /> Table 2 presents the average pounds per day of each constituent discharged to the sanitary <br /> sewer. The constituent quantities were calculated using the formula below The quantity of <br /> hydrocarbons being discharged is in compliance with the City of Stockton Wastewater <br /> Discharge Permit issued for this site. <br /> I� <br /> 6673NCCRRESP6673-W 1-3 <br />