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STATF OF CALIFORNIA GEORGE DEUKMEJIAN.rI1 P ar <br /> CALIFORNIA REGIONAL WATER .lUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION C <br /> 3443 ROUTIER ROAD <br /> SACRAMENTO.CA 95827-3098 �� <br /> 8 September 1988 <br /> A y��F <br /> Mr. Don Gagnon <br /> Gold Bond Building Products <br /> 800 West Church Street <br /> Stockton, CA 95203 <br /> REVISED REQUEST FOR VARIANCE FROM THE MONITORING ALTERNATIVES IN <br /> THE UNDERGROUND TANK REGULATIONS FOR THREE TANKS AT THE GOLD BOND <br /> BUILDING PRODUCTS •FACILITY IN STOCKTON, CALIFORNIA <br /> We have examined the revised proposal for a variance prepared by <br /> American Environmental Management Corp. By letter dated 4 August <br /> 1988 , we requested that Gold Bond provide additional data in ten <br /> areas to support the request before our review could be completed. <br /> Following are subject areas for which more detailed information is <br /> needed: <br /> How will the line connecting the large tank to the two smaller <br /> tanks be monitored to assure that small, on-going leakage is <br /> not occurring? <br /> Provide figures and maps which indicate the basis for location <br /> of monitoring wells (MW) and specifics of MW construction such <br /> as depth, depth of screened interval, screen size, filter <br /> pack, etc. , <br /> - The proposal states that two MWs will be installed near the <br /> large tank, one upgradient and one downgradient. . However, <br /> according to Regional Board staff, the closest MW is about <br /> 1100 feet north of nearest tanks to be monitored, so the local <br /> gradient around the tanks to be monitored has not been <br /> determined. (A minimum of three wells are necessary to solve <br /> a "simple" gradient direction problem) . <br /> - Because the local water table is shallow, approximately 15 <br /> feet in the nearest MW (1100 feet to the north) , an <br /> interception trench may be appropriate to consider in addition <br /> to or rather than MWs. Please prepare a discussion of the <br /> options. <br />