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Boards <br /> Central Valley Regional Water Quality Control Board <br /> TO: Shelton R. Gray <br /> Senior Engineering Geologist <br /> / <br /> FROM: C. Dean Hubbard <br /> Engineering Gao|ogi �-� �-- <br /> FFlEGWO OFFICE ~ <br /> DATE: OMay 2O12 <br /> SUBJECT: REVIEW- HUMAN HEALTH SCREENING EVALUATION, US CAN -WELTY <br /> ROAD PROPERTY, VERNALIS, SAN J[3AQU(MCOUNTY <br /> Chevron Environmental Management Company (Chevron) submitted a Human Health Screening <br /> Evaluation report (F<8port; HHGE) for the USCan -Welty Road property (G\18). The Report, dated <br /> 22 March 2012, was prepared for Chevron by Science Applications International Corporation <br /> Energy, Environment & Infrastructure, LLC (8/\|C). The Site is at the SoU1hVVeS1 intersection of <br /> VV8\ty Road and California State Highway 33' south of the rural COD101uni1y of Vernalis. | have <br /> reviewed the Report and related project documents and nOycomments are provided below. <br /> The Site includes part of the highway alignment, the Union Pacific Fl8UrDad (UPRR) right-of-way <br /> (RCA&/). and several cDDlDla[cio|/[Ur8\/oghcu|1Ur8| properties onboth sides ofHighway 33. The <br /> R{}\Ns associated with the hiS1ohC@| {}\d Valley Pipeline (OVp) are along the south aide of the <br /> highway. The historical Tidewater Associated DU COOlpoOy (TAQC) crude oil pipelines are located <br /> within the UF`F\R R{}VV. The his1Ohc8| TA{}C/DVP pipelines were owned/operated by Chevron <br /> predecessors. Two active petroleum hydrocarbon refined product pipelines are present within the <br /> L]PRReasement ROW. <br /> Based On the findings, C8D1r8| Valley Regional VV818r C>U8|i1y Control Board /CeO1r8| V8\\ay Water <br /> Board) staff concurred iO22OApril 2O11 letter toChevron, that crude oil affected soil and <br /> groundwater had been delineated. There are three areas Ofaffected soil, approximately 4OOfeet <br /> by 500 feet on the south end, 100 feet by 150 feet near the center and the largest at the north end ' <br /> of project approximate Crude oil off8ct8dgroundVvo1er <br /> o 8 prO]a has 8pprOX o � <br /> aXteOdSdOVVDgrodi8Dt' northeast, toadjacent properties. The offsite properties are being <br /> investigated separately 8Sthe Ahern Road-Vernalis project. The affected area onthe south end <br /> overlaps with the Vernalis Pump Station project, with regulatory oversight of the investigations <br /> provided by Central Valley Water Board S18ff. <br /> Onsite soil and groundwater has been affected by total petroleum hydrocarbons as crude oil <br /> (TPHc), low concentrations of certain polynuclear aromatic hydrocarbon (PAH) compounds, and <br /> b8OzeOe, toluene, ethy\b8nZen8' and xylenes /BTEX\, Previous fuel fingerprint evaluation <br /> determined that the petroleum hydrocarbons present are consistent with weathered 88O Joaquin <br /> Valley crude oil. <br /> oco� r��� �~~,� p^m�y o <br /> ,mo`ry.,�. c°��* <br />