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September 26 , 1988 IL' THE SOUTHLAND CORPORATION Calif . Reg . Water Qual . Cont . Board c/o Mr . Gordon Boggs Central Valley Region 3443 Routier Rd . Sacramento , Ca 95815 RE : Southland Location #20304 , Tracy , Ca Dear Mr . Boggs : Attached herewith is the response provided by Harding Lawson Associates , our consultants for this project , to your corres- pondence of 29 August 1988 . We concur with HLA ' s proposal to let the subsurface conditions , as recognized by the geologist who will be supervising the drilling , dictate the actual depth of the well . Thirty to forty feet may be adequate , although we should be prepared to go deeper if necessary at this time rather than to incur yet another expense at some later time when we might be required to provide a deeper well . The requested vapor study has been performed and does verify that no petroleum vapors are entering the store building through the concrete slab floor at this time . The attached table 1 provides the results of that survey . Plate 1 depicts the loc- ation from which these readings were obtained . And finally , we support the contention that the earlier results from MW-14 were an anomaly that had no relationship to the contam- ination in the monitor wells that had been impacted . The recent sampling of MW-14 with non-detectable levels confirms this position. We request your prompt attention and approval of this revised pro- posal for the additional well so that we might stay on schedule for a drilling date of October 17th . Encl . Vapor survey ( table #1 ) Vapor monitoring locations (plate $1 ) Sincere , Hal Miller Environmental Services Manager cc : Walt Lubcke SOUTHLAND ENVIRONMENTAL SERVICES/ LOCATION 2987 5820 STONERIDGE MALL ROAD/SUITE 310/ P.O. BOX 404 /PLEASANTON, CA. 94566/ PHONE (415) 463-2711 FAX (415) 463-3378