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Jr <br /> 4Wm. J. Hunter & Associates 2220 Loma Vista Dr. <br /> Registered Geologists Sacramento, CA 95825 <br /> Petroleum & Mineral Appraisers (916) 972-7941 <br /> , 4-.6sz-FAX (916) 972-1683 <br /> X0 <br /> WORKPLAN ADDENDUM TO WORKPLAN DATED 2 ��, ��� 92� <br /> REMOVAL OF ADDITIONAL SOIL co <br /> California Welding Supply <br /> 1000 E . Eleventh Street, Trac s o '^p kj, <br /> Site Code 2083 ��9� fy <br /> Prepared by mss~ . <br /> Wm. J. Hunter & Associates ''0 0 <br /> November 6, 1997 4 0�, 'L <br /> PURPOSE OF WORK: <br /> On August 21, 1997, WJH submitted a workplan to the San Jo <br /> County EHD for removing the existing pump island and excava 1 <br /> and disposing of contaminated soil. . The County replied on <br /> October 13, 1997, requesting that the workplan be modified to <br /> include additional excavation and details of removal of <br /> contaminated groundwater. <br /> REVISED WORKPLAN: <br /> 1 . Temporarily move a portion of the fence to allow access . <br /> 2 . Remove the pump island and a portion of the sidewalk. <br /> 3 . Excavate an area approximately 8 'x 15 'x 10-12 ' deep as shown <br /> on PLATE II . Groundwater was measured at 8 .28 ' bgl during the <br /> June, 1997 sampling. There is a layer of blue-gray clay at <br /> approximately 5 ' bgl which appears to be a limited aquitard to <br /> the vertical movement of liquids . Extreme care will be exercised <br /> when penetrating this .layer to avoid spreading the contamination <br /> deeper. A vacuum truck or similar equipment will be in position <br /> to remove any free product . <br /> 4 . If, after removal of the contaminated soil, groundwater is <br /> entering the excavation, the backhoe operator will deepen the <br /> center of the pit so that the water will accumulate for easy <br /> removal by the vacuum truck. <br /> 5 . The approximately 50 cubic yards of material removed will be <br /> either containerized or placed on plastic at the rear of the <br /> property. It will be characterized and either remediated on site <br /> or transported to a licensed landfill for disposal . <br /> 5 . Depending upon the results of the excavation, soil samples <br /> may be taken and analyzed for BTEX, TPHg, & TEPH. <br /> 6 . The excavation will be filled with clean material & the <br /> property restored to use. <br /> 1 <br />