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California Regional Water Quality Control Board <br /> Central Valley Region <br /> Robert Schneider,Chair <br /> Terry Tanvninen Fresno Branch Office Arnold Schwarzenegge <br /> Secretory J'ar <br /> Internet Address: http://wwwswreb.ca.gov/—nvgcb5 Governor <br /> Envi,..vnentat <br /> 1685 E Street,Fresno,California 93706-2020 <br /> H'otee'tion Phone(559)445-5116•FAX(559)445-5910 <br /> 19 March 2004 <br /> Mr. M. Scott Mansholt <br /> ChevronTexaco <br /> Chevron Environmental Management Company <br /> P.O. Box 6012 <br /> San Ramon, CA 94583 <br /> SOIL AND GROUNDWATER INVESTIGATION REPORT REVIEW—FORMER VERNALIS <br /> PUMP STATION, BELLINI AND ARCOS PROPERTIES, VERNALIS, SAN JOAQUIN AND <br /> STANISLAUS COUNTIES <br /> Regional Board staff have reviewed the 5 January 2004 Soil and Gr ounclwater Investigation Report, <br /> Former Vernalis Pump Station, Vernalis, San Joaquin and Stanislaus Counties, prepared for <br /> ChevronTexaco by Geomatrix Consultants, Inc. (Geomatrix). The former Vernalis Pump Station site is <br /> comprised of two adjacent privately owned parcels. The Bellini property to the north is located in San <br /> i Joaquin County and the Arcos parcel to the south, is located in Stanislaus County. Additionally, we <br /> i <br /> reviewed previous soil and groundwater investigation reports conducted by Geomatrix and others from <br /> 1995 to 2002. <br /> Detailed comments are provided in the attached memorandum and summarized below: <br /> • Both properties have been impacted by TPH compounds, relatively low concentrations of <br /> j BTEX and PAH compounds in soil, in close proximity to the former pump house, boiler <br /> II house and heater house and the OVP. <br /> ° The vertical extent of impacted soil on both properties extending to approximately 80 feet, has <br /> been adequately delineated. However, the lateral extent of impacted soils has not been <br /> delineated on either property. <br /> • The vertical extent of impacted groundwater has been delineated to the same approximate <br /> depth as impacted soil on both properties. The lateral extent of affected groundwater has not <br /> been adequately defined. Additional onsite and offsite groundwater sampling is needed. <br /> ° Shallow soil samples did not contain hazardous levels of Title 22 metals, and none exceeded <br /> the US EPA PRGs for residential or industrial soils. <br /> In the future, if TPH-g is detected in samples, a detailed evaluation and verification of the <br /> analytical results should be conducted. <br /> California Environmental Protection Agency <br />