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t <br /> r <br /> Brown and Caldwell <br /> lift <br /> Consultants <br /> 723 S Street <br /> "Eft <br /> KtAXIV L; <br /> Sacramento APR 2 3 1992 <br /> CaIdona 95814 7092 <br /> (916)444 0123 ENVIRONMENTAL HEALTH <br /> FAX(916)444 8437 PERMIT/5ERV1�ES <br /> April 17, 1992 <br /> Mr. Chuck Carmel <br /> ARCO Products Company <br /> 2000 Alameda de las Pulgas <br /> Post Office Box 5811 <br /> San Mateo, California 94402 017-6673-04/1 <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 /> the groundwater discharge sampluig at ARCO Products Company (ARCO) Station 2133, <br /> located at 2908 Benjamin Holt Dnve in Stockton, California Listed chronologically is a <br /> summary of the activities related to the discharge of groundwater at the site from January 16 <br /> through February 15, 1992. Table 1 presents a summary of the detected constituents for the <br /> extraction system to date (The complete laboratory reports are included in Attachment A) <br /> 1/22/92 Collected effluent water sample for laboratory anjlysis of total petroleum <br /> hydrocarbons (TPH), and benzene, ethylbenzene, toluene and xylenes (BEI'X) <br /> 2/12/92 LEL monitoring sensor recalibrated and collected effluent water sample for analysis } <br /> of BETX, TPH, and metals <br /> The average flow rate dunng this period (31 days) was 4 4 gallons per minute. The average 1 <br /> daily flow was 5,760 gallons.,/The total volume of water discharged during the period was <br /> 178,560 gallons <br /> Table 2 presents the average pounds per day of each constituent discharged to the sanitary <br /> sewer The constituent quantities were calculated using the formula below The quantity of <br /> hydrocarbons being discharged is in compliance with the City of Stockton Wastewater <br /> Discharge Permit issued for this site <br /> Q = Average flow rate, gpm <br /> C = Concentration, µg/1 <br /> W = Average amount of chemical discharged, lbs/day <br /> W = Q x 1,440 x 8 34 x C/(1,000,000,000) = 0 0001 C for Q= 4 4 gpm <br /> The next monthly status letter will include the interval February 16 through March 15, 1992 <br /> 6673%CORRFSP6673-04 LTR <br />