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Z <br /> California Regional Water Quality Control Board <br /> V-- A <br /> Central Valley Region ® � <br /> Robert Schneider, Chair <br /> Terry Tamnen Fresno Branch Office Arnold Schwarzenegger <br /> mi <br /> Secretary far Internet Address: http://www.swrcb.ca.gov/—rwgcb5 Governor <br /> Environmental 1685 E Street,Fresno,California 93706-2020 <br /> Protection Phone(559)445-5116•FAX(559)445-5910 <br /> 2 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 /> REVIEW OF SOIL INVESTIGATION REPORT—FORMER TAOC TRACY PUMP STATION, <br /> 990 BEECHNUT, TRACY, SAN JOAQUIN COUNTY <br /> Regional Board staff have reviewed the 13 January 2004 Soil Investigation Report, 990 Beechnut Avenue, <br /> Tracy, San Joaquin County, prepared for ChevronTexaco by Geomatrix Consultants, Inc. (Geomatrix). <br /> Additionally, we reviewed previous soil and groundwater investigation reports conducted by Geomatrix <br /> and others from 1997 to 2001 for predecessors of ChevronTexaco. <br /> Detailed comments are provided in the attached memorandum and summarized below: <br /> • The northeast, southwest, and northwest areas of the site (including the pile) have been <br /> impacted by TPH compounds, including PAHs; the depth of impacted soil, extending as <br /> deep as 53 feet, has been adequately delineated. <br /> • Considering how the volume of impacted soil could not likely be removed or remediated <br /> efficiently, a land-use restriction should be considered limiting future use to non- <br /> residential. <br /> • Petroleum hydrocarbons have impacted groundwater beneath the northern portion of the <br /> site. Groundwater needs to be delineated downgradient, north-northwest, beyond the two <br /> boring locations sampled during the recent investigation. <br /> • A plan and time schedule needs to be submitted addressing potential future land use and <br /> the remaining environmental issues. <br /> California Environmental Protection Agency <br /> Url' Recycled Paper <br />