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- <br /> y, <br /> Zil <br /> fr <br /> Brown am r-o weli <br /> MW Consultants - r <br /> ..-^� <br /> 723 5 Street G b:a r _s ladl <br /> Sacramento <br /> ./ Caidorna958W7092 IJ L 199114761444'6123 <br /> FAX f916J444-8437 ENVIR01`JMEN Ai-HEALTH <br /> July 11, 1991 PERf.41T/SEfZV10ES <br /> Mr. Chuck C:armc-1 <br /> ARCO Products Company - <br /> Post Office Box 5811 <br /> San Mateo,California 94. 02 017-5690-24/1 <br /> Subject: Executive Summary of Draft Final Remediation Plan for ARCO Statioa 2133, <br /> Stockton, California <br /> Dear Mr. Carmel: <br /> At the present time, the grourdwater extraction system at ARCO Products Company (ARCO) <br /> Station 2133 is operating at an average discharge of 10.8 to 11.0 gallons per minute (gpm). At <br /> this pumping rate, the system will effectively capture the estimated extent of the hydrocarbon <br /> plume. The extraction system will continue to operate until the regulatory agencies de>z.-mine <br /> that tl:e hydrocarbon concentrations have been reduced sufficiently. <br /> The system discharges directly to the sanitary sewer under a City of Stockton Wastewater <br /> E Discharge Permit. The effluent growidwater being discharged to the sewer:s sampled every two <br /> weeks to monitor the total petroleum hydrocarbon (TPH), benzene, othylbenzene, toluene, wad <br /> xylenes (BETX), and the metals cadmium, chromium, copper, lead, nickel, and zinc. 1F the <br /> concentrations of any of these constituents exceed the concentration designated in the discltarge <br /> permit,the system will be turned off and other treatment alternatives will be considered. <br /> The groundwater monitoring wells at the site are sampled on a quarterly basis and analyzed for <br /> TPH and BETX. The concentrations of the constituents are reported in the quartedy reports <br /> which are submitted to the involved agencies. The true effectiveness of the groundwater <br /> extraction system will be measured by the reduction in the constituents in the monitoring wells. <br /> If you have any questions or comments regarding this report,please call mr at (916)444-0123. <br /> { <br /> Very truly youra, s <br /> B OW�AND CALDWELL CONSULTANTS <br /> E <br /> Steve Misner <br /> Project Manager <br /> SDM:mkw <br /> e <br /> cc: Central Valley Regional Water Quality Control Board <br /> Ms. Mary Meay€, San Joaquin County <br /> Mr. Frank"Fucker, City of Stockton <br /> Mr. Chris Winsor,ARCO Products Company <br />