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f <br /> California Regional Water Quality Control Board f��:';- <br /> 0 <br /> Central Valley Region ;1r <br /> Robert Schneider,Chair �_i1 <br /> Terry Tantminen Fresno Branch Office Arnold Schwatzenegger <br /> Secrerruyfor Internet Address: http://www.swrcb.co.gov/-rwgcb5 Governor <br /> Em,ironmental 1635 G Street,Fresno,Cali rornia 93706-2020 <br /> Prorection Phone(559)445-5116•FAX(559)445-5910 <br /> TO: Shelton R. Gray FROM: C.Dean Hubbard <br /> DATE: 15 April 2004 SIGNATURE:� :,( �/1 �• �/ <br /> SUBJECT: Tracy Byron Road Project, Tracy, San Joaquin Co. <br /> I have reviewed the 18 February 2004 Soil Investigation and Groundwater Investigation Report, Byron _ <br /> Road Project, Tracy, San Joaquin County, prepared for ChevronTexaco by Science Applications <br /> _ International Corporation (SAIC). The investigation was conducted to evaluate the extent of petroleum <br /> hydrocarbon impacted soil and groundwater along approximately 7,000 feet of West Byron Road, from <br /> Corral Hollow on the east to Van Sosten Road on the west. <br /> The purpose of the investigation was to determine the lateral and vertical extent of impacts to soil and <br /> groundwater caused by petroleum hydrocarbon leaks from an abandoned crude oil pipeline(Old Valley <br /> Pipeline,OVP). The OVP was formerly operated by predecessors of Chevron anal Texaco (now <br /> ChevronTexaco), from the early 1900s to the mid-1960s to transfer crude oil from Kem County to Bay area <br /> F refineries. 'u <br /> BACKGROUND <br /> The 250-foot wide by 7,000-foot Iong site, located within a residential area of Tracy, includes the Union <br /> Pacific Railroad tracks and West Byron Road. The site lies between fenced, new residential developments <br /> along portions of the north and south sides, with older residences and small businesses along the south side. <br /> The City of Tracy maintains various utility right-of-way easements within the project site. California <br /> Interstate 205 crosses above Byron Road near the west end of the site. <br /> Regional Board staff issued a 17 April 2003 letter requesting a work plan to delineate petroleum impacted <br /> soil and groundwater along West Byron Road affected by leaks from the OVP. Subsequently, an 18 <br /> August 2003 Workplan prepared by SAIC was approved by Regional Board staff in an 8 September 2003 <br /> memorandum to ChevronTexaco. The Workplan provided a narrative summary of historical soil and <br /> groundwater investigations conducted by Geomatrix Consultants (Geomatrix), SAIC, and others for several <br /> adjacent properties prior to 1998 and up until 2003. <br /> Review of the historical work indicated soil and groundwater investigations were conducted on six adjacent <br /> sites downgradient(north) of the project site. According to the findings,petroleum-impacted soil and <br /> groundwater was delineated, with the exception of the Surland Homes property. No Further Action (NFA) <br /> was approved for five of the six sites by the San Joaquin County Environmental Health Department <br /> (SJCEHD) or the Sacramento Regional Board office between 1996 and 2002. The Surland Homes <br /> California Environmental Protection Agency <br /> ecl Recycled Paper <br />