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California Regional Water Quality Control Board <br /> Central Valley Regions <br /> Robert Schneider, Chair <br /> Terry Tamminen Fresno Branch Office Arnold Sc <br /> Secretaryfirr Internet Address: http://www.swrcb.ca.gov/—rwgcb5 Govvernorernor negger <br /> Environmental 1685 E Street,Fresno,California 93706-2020 <br /> Protection Phone(559)445-5116•FAX(559)445-5910 <br /> 25 February 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 AND GROUNDWATER MONITORING REPORT - <br /> FORMER TAOC TRACY PUMP STATION (880 BEECHNUT),TRACY, SAN JOAQUIN <br /> COUNTY <br /> Regional Board staff have reviewed the 16 December 2003 Soil Investigation and Groundwater <br /> Monitoring Report, Fortner TAOC Tracy Pump Station, Tracy, CA at 880 Beechnut, submitted by your <br /> consultant, Geomatrix Consultants (Geomatrix). Additionally, we reviewed previous soil and groundwater <br /> investigation reports conducted by Geomatrix and others from 1997 to 2002 for predecessors of <br /> ChevronTexaco. <br /> Detailed comments and conclusions provided in the attached memorandum are summarized below: <br /> • Except for the southeast portion of the site, the majority of the soil (including the piles) <br /> has been impacted by TPH compounds including PAHs; the depth of impacted soil, <br /> extending as deep as 48 feet, has been adequately delineated. <br /> • Petroleum hydrocarbons have impacted groundwater beneath the site and floating product <br /> is removed quarterly. Groundwater needs to be delineated downgradient, northeast- <br /> northwest of the site, beyond the existing monitoring wells. <br /> • Considering how the extensive volume of impacted soil could not likely be removed or <br /> remediated efficiently, a land-use deed restriction should be considered limiting future site <br /> use to non-residential. <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 /> ��� Recycled Paper <br />