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Bmvm and Caldwell <br /> CXS:.,'L<;Ms <br /> r <br /> January 20, :992 ,JAN 2 3 1992 <br /> ENV1.R''WV1E:'!T AL fJ.'- LTE-E <br /> PERfv11T/SERVICE_3 <br /> Mr. Chuck Carmel <br /> ARCO Products Company <br /> 2000 Alameda de las Pulgas <br /> Post Office Sox 5811 <br /> San Mateo, California 94402 017-5690-03/1 <br /> Subject: Status of Groundrater Extraction System, ARCO Station 2133, <br /> Stockton, California <br /> OL. Dear Mr.Cannel: <br /> r : <br /> This letter presents tr a current status of the groundwater extraction system and the results of the <br /> groundwater discharge sampling at ARCO Products Company(ARCO)Station 2133, located at <br /> 2908 Benjamin Holt Drive in Stockton, California. Listed chronologically is a summary of the <br /> activities related to the discharge ci groundwater at the site from November 16 through <br /> December I5, 1991. Table I presents a swnmary of the detected constituents for the extraction <br /> system to date. <br /> The groundwater extraction system was not operating continuously during this reporting period <br /> of 30 days. As stated in the December 16, 1991 status letter the extraction system flow rate was <br /> decreased to 5.5 gallons perminu:e(gpm)from 10.5 gpm because the zone of capture was larger <br /> than needed.;The decreasedJ1ow in the discharge piping allowed sewer gases from the.sewer <br /> main to migrate back up to thi;point where the lower explosive limit(LEL)exceeded 10 percent- <br /> -which turned the system of1,� <br /> The LEL sensor was checked and calibrated, and the system restarted. The system again turned <br /> off due to a high LEL alarm after approximately 2000 gallons were discharged. The LEL sensor <br /> has been relocated so that it monitors explosive gases in the headspace of the above ground <br /> holding,tank. In this Iocation the LEL sensor monitors gases that are more representative of <br /> gases being discharged to the sewer. The system was restarted on December 20, at 5 gpm, and <br /> has been operatiil�,- since then. The system was sar:Y!cd for TPH-G/BETX, metals, and total <br /> toxic organics on.January 8, 1992. The results of this sampling will be included in the next <br /> status report (covers December 16, 1991 thzough January 15, I992). <br /> 15 <br /> SCrHM`ORkE5W3(+rYU.t <br />