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Ms. Trista Schulze <br /> Stantec Consulting, Inc <br /> April 23, 2002. <br /> Page 2 <br /> Based on our experience, residual weather crude oil associated with ChevronTexaco's historic <br /> pipeline operations can be observed visually; however analytical laboratory testing is necessary to <br /> confirm that the likely source of the affected material is the historic pipelines. Based on analytical <br /> results and human health risk assessments performed at the aforementioned historic <br /> pipeline release <br /> sites governing a <br /> g g g en <br /> Cres(San Joaquin County Public Health Services, Environmental Health <br /> I' Division or the California Regional Water Quality Control Board, Central Valley Region) have <br /> "- or7curred`with ChevronTexaco's findings that the presence of the residual weathered-crude'bil— <br /> material does not pose an unacceptable risk to human health. <br /> In the event that petroleum-affected soil is encountered in the vicinity of the historic pipeline right-of- <br /> way during site construction activities,.ChevronTexaco requests to be contacted and to be provided <br /> with a reasonable opportunity to collect samples of the affected soil to perform its own evaluation of <br /> the nature of the material. If the City of Tracy and ChevronTexaco agree that the identified material <br /> is associated with ChevronTexaco's historic pipeline operations and no other potential responsible <br /> parties are in question, ChevronTexaco will coordinate with the City of Tracy and its contractors to <br /> minimize potential construction delays associated with encountering affected soil during construction <br /> activities. <br /> ChevronTexaco requests to be provided with a copy of"issued for construction"construction <br /> drawings and to be notified a minimum of one week prior to the start of WCO construction activities <br /> in the vicinity of the historic pipeline right-of-way. Please note that Chevron Pipe Line Company <br /> (CPL) has separately requested to review copies of all "in-progress"construction drawings. CPL will <br /> provide separate correspondence with regard to coordination pertaining to activities associated with <br /> the active products pipeline that parallels Grant Line Road. t <br /> Thank you for your consideration. If you have any questions or require additional information,please <br /> call Larry Whitehead of Chevron Pipe Line Company at (925) 753-2003, Penny Fottreli of Geomatrix <br /> Consultants at(925) 842-1343, or me at(925) 842-1341. <br /> Sincer <br /> o ert D. Mihalovich <br /> Enclosure: July 19, 1974 Getty Oil Company letter <br /> Soil Management Plan <br /> cc: Zabih Zaca, City of Tracy <br /> Gary Dobler <br /> Michael Infurna, San Joaquin County Public Health Services <br /> Larry Whitehead,CPL <br /> d <br />