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California Regional Water Quality Control Board <br /> Central Valley Region <br /> Robert Schneider,Chair <br /> ' 'rerry Tamminen Fresno Branch Office Arnold Schwateucgger <br /> .Sao ernrpjor Internet Address: htt //w—vswreb.ca. ov/-rw eb$ <br /> E""' omon 1635 E Street,Fresno,California 9377062020 Governor <br /> l'rmection Phone(559)445-5116•FAX(559)445-3910 <br /> 1 <br /> TO: Shelton R. Gray FROM: C.Dean Hubbard <br /> DATE: 15 April 2004 SIGNATURE: <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 cnide oil pipeline (Old Valley I <br /> ' Pipeline,OVP). The OVP was formerly operated by predecessors of Chevron and Texaco (now <br /> ChevronTexaco), from the early 1900s to the mid-1960s to transfer crude oil from Kem County to Bay are, <br /> refineries. <br /> ' BACKGROUND <br /> ' The 250-foot wide by 7,000-foot long 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 I <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 /> 0d Rerycled Paper <br /> 1 <br /> 1 <br />