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M. Scott Mansholt - 2 - 17 December 2008 <br /> Chevron <br /> Catellus Property <br /> Based on our review, Central Valley Water Board staff concurs that: <br /> • The lateral and vertical extent of affected soil has been delineated. <br /> • Groundwater has been defined up and downgradient of the Singh private domestic well <br /> and nearby borings SB-66 and 67. However, additional investigation is needed to <br /> confirm if the petroleum hydrocarbons detected in the SB-66 groundwater sample <br /> represent diesel fuel or crude oil. <br /> • The lateral and vertical extent of affected groundwater has been delineated except for <br /> near SB-66 and the area downgradient of the former Tracy Pump Station facility which <br /> will be addressed separately. <br /> By 20 February 2009, please submit the workplan to address the source of TPHd identified in <br /> the SB-66 groundwater sample. <br /> If you have any questions or comments, please contact Dean Hubbard at (559) 445-5179. <br /> G� �L ck_ <br /> SHF_L TON R. CRAY C. DEAN HUBBARD <br /> Senior Engineering Geologist Engineering Geologist <br /> P.G. No. 6357 <br /> Attachment <br /> cc: Michael J. Infurna, San Joaquin County EHD, Stockton <br /> Charles McPhee, Catellus Tracy LLC, Tracy <br /> Michael Turner, Prologis, Tracy <br /> Dnalvinder Kaur Singh, Tracy <br />