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!r. <br /> [Ifflik Brown and Caldwell <br /> Consultants <br /> 723 S Street <br /> Sacramento <br /> 95814-7092 <br /> (916)44 <br /> (916)444 0123 <br /> FAX(9 16)444 8437 <br /> MAR P <br /> March 17, 1993 <br /> PE,Rmiii i I-kkV <br /> Mr Chuck Carmel <br /> ARCO Products Company <br /> 2000 Alameda de las Pulgas <br /> Post Office Box 5811 <br /> San Mateo, California 94402 017-7452-0411 <br /> Subject Status of Groundwater Extraction System, ARCO Station 21.33, <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 December 16, 1992, through January 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 /> 12/16/92 Collected effluent water sample for laboratory analysis of total petroleum <br /> hydrocarbons (TPH), benzene, ethylbenzene, toluene, and xylenes (BETX). <br /> 12/30/92 Collected effluent water sample for laboratory analysis of total TPH and BETX, <br /> and metals. <br /> 1/13/93 Collected effluent water sample for laboratory analysis of TPH, BETX, and <br /> metals Calibrated LEL sensor <br /> The average flow rate during this period (30 days) was approximately 2.1 gallons per minute <br /> (gpm) The average daily flow was 3,000 gallons. The total volume of water discharged <br /> during the period was 72,500 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 /> 7452VC ORRFS"452-04.L2 <br />