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Brown and Caldwell <br /> Consultants <br /> 723 S Street PEI %4 i SIE VICE <br /> Sacramento93 JUL 1 t, P� <br /> Caldomiaia 995814 7092 f;t <br /> (916)444 0123 ' 8 <br /> FAX(9 16)444 8437 <br /> July 8, 1993 <br /> Mr Chuck Carmel <br /> ARCO Products Company <br /> 2000 Alameda de las Pulgas <br /> Post Office Box 5811 <br /> San Mateo, California 94402 017-7452-04/1 <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 /> groundwater discharge sampling at ARCO Products Company (ARCO) Station 2133, located <br /> at 2908 Benjamin Holt Drive in Stockton, California- Listed below is a summary of activities <br /> and discharge of groundwater at the site from March 16, 1993, through April 15, 1993. Table <br /> 1 presents a summary of the detected constituents for the extraction system to date. (The <br /> complete laboratory report for dm reporting period is included in Attachment A) <br /> 4/14/93 Collected effluent water sample for laboratory analysts of total petroleum i <br /> hydrocarbons (TPH), benzene, ethylbenzene, toluene, and xylenes (BETX). <br /> The average flow rate during this period (31 days) was approximately 2.4 gallons per minute <br /> (gpm). The average daily flow was 3,495 gallons. The total volume of water discharged <br /> during the period was 108,364 gallons. <br /> Table 2 presents the average pounds per day of each constituent discharged to the sanitary <br /> sewer The quantity of hydrocarbons being discharged is in compliance with the City of <br /> Stockton Wastewater Discharge Permit issued for this site. The constituent quantities were <br /> calculated using the following formula. <br /> This report was prepared in accordance with the standards of the environmental consulting industry at the time it was <br /> prepared It should not be relied upon by parties other than those for whom it was prepared,and then only to the extent <br /> of the scope of work which was authorized This report does not guarantee that any additional environmental conditions <br /> beyond that described in this report exist at this site <br /> 745ZCOfiRASF 452-04.-5 <br />