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Kayo Oil c'�1pany _ conoco t: <br /> ao a subsidiary of'�,.oco Inc. ✓ I <br /> P.O. Box 4784 i <br /> Houston, TX 77210-4784 <br /> February 20, 1988 <br /> F B B 2 2 �9B9 <br /> L1i��i'?O I'J;c is f AL HFALTH <br /> Mr. Edward W. James FERM11 i SERVICES. <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road <br /> Sacramento, CA 95827-3098 <br /> RE: Revised Final Remedial Plan for <br /> 3425 East Washington Street <br /> Stockton, CA <br /> Contingency Plan to Main Hydraulic Control <br /> Dear Mr. James: <br /> This letter serves as the contingency plan for the Stockton site <br /> should plume expansion be caused by operation of the proposed <br /> balanced extraction/injection bioremediation system. As requested <br /> in your February 1, 1989 letter a point by point plan has been <br /> prepared based on our discussion on February 1, 1989 and is <br /> presented below. <br /> o Water levels will be measured twice weekly and groundwater <br /> level contour maps prepared as requested, and included in the <br /> bi-weekly remedial progress reports. These reports will be <br /> submitted to the Central Valley Regional Water Quality Control <br /> Board (CRWQCB) and the San Joaquin Local Health District <br /> (SJLHD) until you are assured that hydraulic control is <br /> maintained. <br /> o Should contour maps show a loss of hydraulic control the <br /> system would be shut off and both the RWQCB and the SJLHD <br /> would be informed immediately by phone. <br /> o Upon approval from the RWQCB or the SJLHD injection would <br /> stop and pumping would recommence with water discharged after <br /> carbon treatment to the sewer. The system has been modified <br /> with a dedicated water line to shunt water from the <br /> groundwater pumps to the treatment control compound. Two <br /> carbon canisters connected in series with a totalizing flow <br /> meter will be stored within the compound but not connected to <br /> the shunt line. If required, the canisters will be connected <br /> and treated water discharged to the sewer. The canisters <br /> would not be connected unless needed to avoid accidental <br /> discharge to the sewer. <br /> a <br /> } <br /> i <br /> 21-493S <br />