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Br 1 <br /> Brown and Caldwell <br /> Consultants <br /> F 723 5 StreetSacramento Ju <br /> �! <br /> Caldomia 95814 7092 l <br /> {916)444 0123 <br /> FAX(916)444 8437 <br /> July 21, 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 017-7452-0411 <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 April 16, 1993, through May 26, 1993. Table 1 <br /> presents a summary of the detected constituents for the extraction system to date. (The <br /> complete laboratory report for this reporting period is included in Attachment A) <br /> 5125193 Collected effluent water sample for laboratory analysis of total petroleum <br /> hydrocarbons (TPH), benzene, ethylbenzene, toluene, and xylenes (BETX), <br /> metals, biochemical oxygen demand, total suspended solids, oil and grease, <br /> volatile and semivolatile organic compounds (EPA 624, 625). <br /> The average flow rate during this period (30 days) was approximately 1.5 gallons per minute <br /> (gpm) The average daily flow was 2,103 gallons. The total volume of water discharged <br /> during the period was 63,102 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 /> f� 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 prepared It <br /> Should not be relied upon by parties other than those for whom it was prepared,and then only to the extent of the scope of work which <br /> was aiahortzed This report does not guarantee that any additional environmental conditions beyond that described in this report exist <br /> at thu site 745T CORRESN7452-041A <br /> 3�� <br />