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Ms. Laurie A. Cotulla <br /> September 16, 1991 <br /> Page 2 <br /> Subsurface soil at that depth is silty clay which will favor <br /> strong capillary force. In the work plan, Alton Geoscience <br /> proposed drilling additional borings in the median of East <br /> Grantline Road. Drilling in the median, however, :-was <br /> prohibited by a representative of Chevron Company (refer to <br /> the supplemental site investigation report, page 5, second <br /> paragraph) . Also note the presence of three Chevron <br /> underground fuel lines (regular, unleaded, and diesel in <br /> Cross Section A-A' ) . Therefore another possible source of <br /> petroleum hydrocarbons may exist offsite upgradient of Soil <br /> Boring B-2. i <br /> Based on the analytical results (see Table 2 of the I <br /> supplemental site investigation report) , the extent of <br /> petroleum hydrocarbon-affected soil has been approximately <br /> defined in all directions in the vicinity of this site. <br /> Comment Number 5: <br /> SJCPHS will be informed prior to the next ground water <br /> sampling event. As required by SJCPHS, split samples will be <br /> provided for chemical analysis at Mobil Oil's expense. <br /> Comment Number 6: <br /> An addendum to the supplemental site investigation that <br /> satisfies requirements for a Problem Assessment Report, as <br /> outlined in the Tri-Regional Board Recommendations, will be <br /> submitted to you prior to September 30, 1991. <br /> Please call if you have any questions regarding this .project. <br /> f <br /> Respectfully, <br /> ALTON GEOSCIENCE <br /> Tridib K. Guh <br /> a <br /> Project Manager <br /> Enclosure <br /> WGS/TG/PCL <br /> cc: Ms. Steve Pao, Mobil Oil Corporation, Burbank, California <br /> Ms. Elizabeth Thayer, CVRWQCB, Sacramento, California <br /> Mr. Greg Schubert, Mark III, Sacramento, California <br /> t <br />