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Brown and Caldwell <br /> ' Consultants <br /> 723 5 Street <br /> Sacramento <br /> Calrfomia 95814 7492 <br /> FAX(444 0123 r�h 444 <br /> FAX(9 16)444&137 JA <br /> �CM <br /> MAR 2 2 <br /> March 17, 1993 F-NVINUNMENTAL KOO' <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 January 16, 1993, through February 15, 1993 <br /> Table 1 presents a summary of the detected constituents for the extraction system to date. <br /> (The complete laboratory report for this reporting period is included in Attachment A) <br /> 1127193 Collected effluent water sample for laboratory analysis of total petroleum <br /> hydrocarbons (TPH), benzene, ethylbenzene, toluene, and xylenes (BETX) <br /> 2110193 Collected effluent water sample for laboratory analysis of total TPH and BETX, <br /> and metals. <br /> The average flow rate during this period (31 days) was approximately 4.76 gallons per minute <br /> (gpm). The average daily flow was 6,854 gallons. The total volume of water discharged <br /> during the period was 212,486 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 /> 745Z<0RRES1N74524AJ i <br />