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l� Brown and Caldwell <br /> ., <br /> Be <br /> Consultants i ` T l <br /> 723SStreet � k�s ��, `If i;E 1}7 <br /> Sacramento L <br /> Calrfomia 95814-7032 <br /> (9)6)4440123 93 SEP -8 PM 1' 39 <br /> FAX 19 15)444 x437 <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 017-7452-0411 <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 June 16, 1993, through July 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 penod is included in Attachment A) <br /> 7115193 Collected effluent water sample for laboratory analysis o1 total petroleum <br /> hydrocarbons (TPH) (EPA Method 8015, Modified), benzene, ethylbenzene, <br /> toluene, and xylenes (BETX) (EPA Method 8020), and lead (EPA Method <br /> 742113005) <br /> The total volume of water discharged during the period was 125,410 gallons The average <br /> flow rate during this period (29 days) was approximately 3 0 gallons per minute (gpm) The <br /> average daily flow was 4,324 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 /> i <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 to this report exist at this site <br /> 745 Z�CORRESY\7452--04 L-B <br />