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' 1 <br /> > Brown and Caldwell <br /> BeConsultants <br /> 723 S Sheen <br /> 1 Sacramernor +r <br /> . Caldomia 95814-7092 i F try <br /> (916)444-0123 <br /> FAX(916)444-5437 <br /> AUG 1 8 1992 <br /> ENVIRONMENTAL HEALTH <br /> August 12, 1992 PERMIT/SERVICES <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 May 16 <br /> through June 15, 1992. Table 1 presents a summary of the detected constituents for the <br /> extraction system to date (The complete laboratory reports for this reporting period are <br /> included in Attachment A) <br /> 6/1/92 Collected effluent water sample for laboratory analysis of total petroleum hydrocarbons <br /> (TPH), and benzene, ethylbenzene, toluene and xylenes (BEI'X). <br /> 6/10/92 Collected effluent water sample for laboratory analysis of TPH,BEI'X, and metals. <br /> The system was operated intermittently during the later part of this time period. The probable <br /> cause is a maladjusted or faulty float switch at the point of discharge to the sanitary sewer <br /> The float switch has been repaired and the system is now operating normally. <br /> The average flow rate during this period (31 days) was approxunately <1 gallon per minute <br /> (gpm) The average daily flow was 1,128 gallons The total volume of water discharged <br /> during the period was 57,000 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 /> -0a I.2 <br />