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y jM <br /> Brown and Caldwell <br /> c� Consultants <br /> 723 S Street <br /> Sacramento <br /> Calgomia 95814 7092 <br /> (916)444 0123 <br /> FAX(916)4"8437 MAY � � 992 <br /> May 13, 1992 6NVIRQN'IV%. <br /> PQM M i w�r,�' EALTH <br /> F �; <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 sampling at ARCO Products Company (ARCO) Station 2133, <br /> located at 2908 Benjamin Holt Drive in Stockton, California Listed chronologically is a <br /> summary of the activities related to the discharge of groundwater at the site from February 17 <br /> through April 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 /> 2/26/92 Collected effluent water sample for laboratory analysis of total petroleum <br /> hydrocarbons (TPH), and benzene, ethylbenzene, toluene and xylenes (BETX) <br /> 3/11/92 Collected effluent water sample for analysis of BETX, TPH, and metals <br /> 3/25/92 Collected effluent water sample for analysis of TPH and BETX <br /> 4/3/92 Flow rate was declining so system was shut down and pump removed for cleaning <br /> 4/7/92 Pump reinstalled and system restarted at 4 8 gallons per minute (gprn) <br /> 4/8/92 Collected effluent sample for TPH, BETX, and metals <br /> The average flow rate during this period (60 days) was 3 5 gpm The average daily flow was <br /> 5,184 gallons The total volume of water discharged during the period was 290,304 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 /> 6673VCORRBSP\6673-04 LTR <br />