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Brown and Caldwell fk ZDI <br /> x E <br /> Ccnsultants <br /> 723 5 Street 0 E C 0 799,92 <br /> . 5acramenso581ENVIRONMENTAL HEALTH <br /> Cal oma 94 7092 <br /> (91PERMIT SERVICES <br /> oi 4.14 0123 <br /> �" ;� <br /> rruC:916)444-8437 <br /> December 3, 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, Califorma. Listed below is a chronological <br /> summary of activities related to the discharge of groundwater at the site from September 16 <br /> through October 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 /> 9/23/92 Collected effluent water sample for laboratory analysis of total petroleum <br /> hydrocarbons (TPH), and benzene, ethylbenzene, toluene and xylenes (BETX). <br /> 10/14/'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 3.2 gallons per minute <br /> (gpm). The average daily flow was 4,608 gallons. The total volume of water discharged <br /> during the period was 138,240 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 /> 3 <br />