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r <br /> 'B C Brown and Caldwell <br /> Consultants <br /> 723 S Street E VTR0; `NT r1 L HEALTH <br /> Sacramento �� � !�j MR VICE <br /> Caldome 95814 7092 <br /> (916)444-0123 93 SEP _,R p r� <br /> FAX(916)444 8437 i 7 J <br /> September 3, 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 May 27, 1993, through June 15, 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 /> 6/10/93 Collected effluent water sample for laboratory analysis of total petroleum <br /> hydrocarbons (TPH) (EPA Method 8015, Modified), benzene, ethylbenzene, <br /> toluene, and xylenes (BETX) (EPA Method 8020), metals (EPA Method 200 7), <br /> and volatile organic compounds (EPA Method 8240) <br /> The total volume of water discharged during the period was 189,207 gallons The average <br /> flow rate during this period (31 days) was approximately 4 2 gallons per minute (gpm) The <br /> average daily flow was 6,104 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 <br /> extent of the scope of work which was authorized This report does not guarantee that any additional environmental <br /> conditions beyond that described in this report etist at this site <br /> 7452',CORRESP7452-04 L-7 <br />