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-STATE OF CALU:C~ GEORGE DEUKMEJIAN,Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD <br /> SACRAMENTO,CA 95827-3098 <br /> 27 March 1990 <br /> Ms. Diane Hinson " <br /> Supervising REHS MAR 2 8 1989 <br /> San Joaquin County <br /> Public Health Services Ei�TAL HEALTH <br /> Environmental Health Division y ,RM,1T/SERVICES <br /> P.O. Box 2009 <br /> Stockton CA 95201 <br /> BILL'S BAIT & BEACON GAS, 515 WEST 11TH STREET, TRACY - WORK PLAN FOR <br /> INTERIM REMEDIATION OF SOIL AND GROUND WATER <br /> We have reviewed the 15 March 1990 Soil and Ground Water Interim <br /> Remediation and Ground Water Monitoring Work Plan prepared for this site <br /> by Geological Technics, Inc. The work plan includes a proposal for <br /> installation of one additional ground water monitoring well , installation <br /> of an interim ground water remediation system, and initiation of a long- <br /> term ground water monitoring system. <br /> The goal of the interim remediation system should be to provide the <br /> greatest possible contaminant recovery with the available resources. The <br /> proposed interim remediation system design was based primarily on economic <br /> considerations discussed at our meeting of 6 March 1990. However, the <br /> effectiveness of the system is dependent on the validity of two principal <br /> assumptions: <br /> 1. The existing 2-inch diameter well (MW-1) will be able to <br /> produce an adequate quantity of water; and <br /> 2. MW-1 will efficiently draw water from the contaminated zone. <br /> If either of these assumptions is invalid the proposed system may be <br /> ineffective. If the recovery well does not produce the planned volume of <br /> water, the system may be inoperable, and the money spent on installation <br /> will have been wasted. If the well produces an adequate volume of water, <br /> but does not extract water efficiently from the contaminated zone, i .e. , <br /> water is also extracted from deeper less contaminated zones, the proposed <br /> remediation system will not be effective in either recovering the <br /> contaminants or in slowing the migration of the plume. <br /> A performance test should be conducted to determine whether MW-1 will <br /> provide a sustained yield prior to installing the interim remediation <br /> system. This testing can be done concurrently with acquiring access for <br /> the proposed downgradient well . During the testing period, samples should <br /> be obtained to determine whether the recovered ground water is being <br /> derived from the contaminated zone or from deeper, less contaminated <br /> zones. <br />