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�. � == �;. .r.: �• �,� <br /> kms' �.� <br /> F" �:,�r <br /> x.., <br />'i <br /> Mr. Chuck Carmel <br /> July 11. 1991 <br /> Face 14 <br /> Security Measures <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 /> Surn-nary <br /> At the present time,the groundwater extraction system at ARCO Station 2133 is operating at an <br /> average discharge of 10.8 to 11.0 gpm. At this pumping rate,the system 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 dimctly to the sanitary sewer under a City of Stochon Wastewater <br /> Discharge Permit. The effluent groundwater being discharged to the sewer is sampled eery two <br /> weeks to monitor the total petroleum hydrocarbon (TPH), benzene, ethylbenzene,toluene, and <br /> xylene (BETX), 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)44.4-0123. <br /> Very truly yours, <br /> BROWN AND CALDWELL CONSULTANTS <br /> JAY Cr?V G `y{ <br /> 7z c— Luc.: �: r <br /> Steve Misner Jay C. Lucas ko,45pi <br /> Project Manager California Registere Cr oLOLtE r <br /> SDM.mkw <br /> cc: Central Valley Regional Water Quality Control Board <br /> Mr. Prank Tucker, City of Stockton <br /> Ms. Mary Meays, San Joaquin County <br /> Mr. Chris Winsor,ARCO Products Company <br /> Bmwn and Caldwell <br /> CCr5iaitttn?s - <br />