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• i <br /> June 28, 1988 Harding Lawson Associates <br /> Phi 17060,008.03 <br /> Mr. Hal Miller <br /> The Southland Company <br /> Page 5 <br /> Monitoring wells (MW) 9 and 10 are intended to check for <br /> free product in the water and soil. Since light hydrocar- <br /> bons will primarily be transported along the water surface <br /> or within the capillary fringe, these wells will not need to <br /> be more than a few feet below the water surface. Data col- <br /> lected to date indicates that the water surface is between <br /> three and five feet below grade. It is therefore expected <br /> that a eight foot well with five feet of screen will be suf <br /> e ficient to allow monitoring of the water surface. Depending ' <br /> on the limits of the free product plume and the subsurface , <br /> conditions encountered, these monitoring wells may eventu <br /> °ally be used as extraction wells in part of a remedial <br /> design. <br /> MW-ll through 15 are primarily .being installed as checks for <br /> k hydrocarbon contaminantsin the water. Since it is antici- <br /> pated.that 'these wells may be left in place and may poten- <br /> tially be incorporated into a remedial program, the total <br /> depth of these wells will be between 15 and 20 feet. This <br /> greater- depth is recommended to allow for <br /> ."fluctuations. ground water <br /> Boring P-8 will not be completed as a well. This probe will <br /> be -used.-to- collect soil samples to assist in defining the <br /> limits of free product and the presence of P gasoline .con- <br /> ..-stituents in the soils. The total depth of this probe will <br /> he approximately five feet, just deep enough to intersect <br /> R the capillary fringe and water table. Upon completion of <br /> sample collection from this location, the hole will be <br /> } grouted full depth with a cement bentonite slurry. All soil <br /> and ground water samples will be analyzed for TPH as gaso <br /> line .BTXE. <br /> Both the boring and monitoring wells will be drilled and in- <br /> stalled as described in the Appendix to the proposal of <br /> April 29, 2988. Upon completion of this segment of work, <br /> -- - - -- all collected data will be evaluated and-a feasibility study --- <br /> initiated is accordance with HLA's April 29, 1988 proposal. <br /> All results and recommendations will be included in a formal <br /> report issued at the conclusions of the Phase Ip investiga <br /> tion. . <br /> ,t _ <br /> F <br /> r� <br />