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I <br /> STATE OF CALIFORNIA — ENVIRONMENTAL PROTI )N AGENCY PETE WILSON, Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD, SUITE A \ e <br /> SACRAMENTO, CA 95827-3098 <br /> PHONE: (916) 255-3000 _ <br /> FAX: (916) 255-3015 � Tx ' <br /> J <br /> MAY 0 7 5 May 1993 <br /> ENV.jRCNMENTAL HEALTH <br /> PERMIT/SERVICES <br /> Mr. Richard Laubacher <br /> BP Oil Company <br /> 4850 East 49t Street <br /> Cleveland, Ohio 44125-1079 <br /> PROBLEM ASSESSMENT REPORT, BP OIL COMPANY, STOCKTON FACILITY, SAN JOAQUIN COUNTY <br /> I have reviewed RESNA' s 21 April 1993 response to my 7 April 1993 comments on the <br /> problem assessment report for the additional soil and ground water investigation <br /> at your Stockton facility. <br /> My 7 April 1993 letter requested that you submit a work plan for the installation <br /> of an additional monitoring well to define the extent of ground water <br /> contamination downgradient from MW-1. This request was based on historical data <br /> which show ground water flow directions to the west and southwest. The current <br /> monitoring well network does not monitor ground water flowing in these directions. <br /> In response, RESNA proposed to continue quarterly monitoring of the ground water <br /> wells and if the ground water contours indicate a flow to the west-southwest, a <br /> work plan for installation of an additional monitoring well will be submitted. <br /> Although the December 1989 and September 1992 ground water elevations show ground <br /> water flowing in the aforementioned directions, I will hold in abeyance my request <br /> for a work plan for installation of an additional monitoring well . However, if <br /> future monitoring shows ground water flows to the west-southwest, a work plan for <br /> well installation shall be submitted to the Board within 30 days of this <br /> determination. <br /> As indicated above, RESNA' s response was sent directly to me. In the future, I <br /> request that BP Oil Company' s response be submitted by you or another <br /> representative to ascertain BP Oil Company' s concurrence with its consultant' s <br /> recommendations. <br /> Please call me at (916) 255-3049 if you have any questions. <br /> PHILIP S. ISORENA <br /> Associate Engineer <br /> PSI :dlk <br /> Enclosure <br /> cc: Ms. Diane Hinson, San Joaquin Local Health District, Stockton <br /> Mr. Gregory P. Stahl , RESNA, Escalon <br />