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Geomatrix <br /> Mr. Dean Hubbard <br /> California Regional Water Quality Control Board - Central Valley Region <br /> January 30, 2007 <br /> Page 5 <br /> Schedule <br /> Geomatrix anticipates implementing the soil investigation after the rainy season when the site <br /> surface is dry and accessible. In addition, based on the potential groundwater mounding <br /> effects from the nearby retention basin, Geomatrix will implement the groundwater <br /> investigation in the early summer. Geomatrix will request access to the private well upon <br /> approval of this work plan. <br /> Please contact either of the undersigned if you have any questions or require any additional <br /> information. <br /> Sincerely yours, <br /> GEOMATRIX CONSULTANTS, INC. <br /> Bryan Turner, PE, CHG#869 Gary R. Foote, PG#5044 <br /> Project Engineer Vice President and Principal Geologist <br /> BHT/GRF/bg <br /> lADoc_Safe\7000s\7066.001\TA0C Tracy Gravel Pits Work Plan Letter no sigs.doc <br /> Attachments: <br /> Figure 1: Site Location Map <br /> Figure 2: Previous Sampling Locations <br /> Figure 3: Proposed Test Trench Locations <br /> Figure 4: Proposed Grab-Groundwater Sample Locations <br /> cc: M. Scott Mansholt, Chevron <br /> James Levy, UPRR <br /> Michael J. Infurna, San Joaquin Environmental Health Department <br />