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Brown and Caldwell <br /> Consultants <br /> r '23 S S,ieet l <br /> M6)4441-00 J U L 15 11091 <br /> FAX 19i61—LoENViRo-1,4kic,NI—nt, HI H <br /> July [1, I4991 PEW-11T <br /> Mr. Chuck Carmel <br /> AR^O Products Company <br /> Post Office Box 58I1 <br /> Sari Mateo,California 94402 017-5690-24/1 <br /> Subject: Executive Summary of Draft Final Remediation Plan for ARCO Station 2133, <br /> Stockton, California <br /> Dear Mr. Carmel: <br /> At the present time, the groundwater extraction system at ARCO Products Company (ARCO) <br /> Station 2'33 is operating at an average discharge of 10.8 to 11.0 gallons per minute(,-pm). At <br /> this pumping rate, the system will effectively capture the estimated extent of the hydrocarbon <br /> plume. The extraction systcm will continue to operate until the regulatory agencies determine <br /> that the hydrocarbon concentrations have been reduced sufficiently. <br /> The system discharges directly to the sanitary sewer under a City of Stockton Wastewater <br /> Discharge Permit, The effluent groundwater being discharged to the sewer is sampled every two <br /> weeks -? monitor the total petroleum hydrocarbon (TPH), benzene, ethylbenzene, toluene, and <br /> xylenes (BECX), and the metals cadmium, chromium, copper, lead, nickel, and zinc. If the <br /> concentrations of any of these constituents exceed the concentration designated in the discharge <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 quarterly 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 me at(916)444-0123. <br /> Very truly yours, <br /> BROWN AND CALDWELL CONSULTANTS <br /> Steve Misner <br /> Project Manager <br /> SDM:nnkw <br /> cc: Central Valley Regional Water Quality Control Board <br /> Ms. Mary Meays, San Joaquin County <br /> Mr. Frank Tucker, City of Stockton <br /> Mr. Chris Winsor, ARCO Products Company <br />