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le <br /> k ' <br /> ME! 1::,!!11 <br /> ES <br /> M,- - <br /> Mr. Chuck Carmel <br /> July 11. 1991 <br /> Page 14 <br /> r^ <br /> Security Measut•es <br /> The above ground components of the groundwater extraction system are surrounded by a cyclone <br /> :once with a locked gate. The extraction well head and its components are enclosed in a below <br /> ground, steel traffic vault. The doors of the vault are secured with two bolts. <br /> Summary <br /> At the present time,the groundwater extraction system at ARCO Station 2133;s operating at an <br /> average discharge of 10.8 to 11.0 gpsn. At his pumping rate,the systen,will effectively capture <br /> the estimated extent of the hydrocarbon plume. The extraction system will continue to operate <br /> until the regulatory agencies determine that the hydrocarbon concentrations have been reduced <br /> sufficiently. <br /> The system discharges directly to the sanitary sewer under a City of Stocldon Wastewater <br /> Discharge Permit. The effluent groundwater being discharged to the sewer is sampled every two <br /> weeks to monitor the total petroleum hydrocarbon (TPH), benzene,ethylbenzene, toluene; and <br /> xylene (BET%), 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 consideree. <br /> The groundwater monitoring wells at the site are sampled on a quarterly basis and analyzed for <br /> of the constituents are reported in the quarterly reports <br /> TPH and BM. The concentrations <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. j <br /> Very truly yours, <br /> BRO AND CALDWELL CONSULTANTS <br /> a; <br /> Ltr�t-�O j WYCl <br /> I� lUC:CC <br /> Jay C. Lucas 1 no.4:01 <br /> Steve Misner <br /> Project Manager California Registere *fsoLo . <br /> SDM:mkw <br /> cc: Central Valley Regional Water Quality Control Board <br /> Mr. Frank Tucker, City of Stockton <br /> Ms. Mary Mcays, San Joaquin County <br /> Mr. Chris Winsor, ARCO Products Company <br /> Brown and Caldwell <br /> Consultants <br />