Laserfiche WebLink
Californiaoegional Water Quality Con hoard P T, <br /> Central Valley Region <br /> Karl E.Longley,Sc D,PE,Chair <br /> Linda S.Adams . �;•` <br /> Secretar)!for Fresno Branch office Arnold <br /> Ernvtronniental 1685 E Street,Frew,California 93706 Sehwarzenegger <br /> Protection (559)445-5116•fax(559)445-59 to Governor <br /> ht tp://www,wa terboa rds.ca,gov/cen tra I vat t ey <br /> TO. Shelton R. Gray FROM: C. Dean Hubbard <br /> Senior Engineering Geologist Engineering Geologist <br /> DATE: 8 July 2008 SIGNATURE: <br /> SUBJECT: REVIEW- TRACY BYRON ROAD PROJECT, TRACY, SAN JOAQUIN CO. <br /> I have reviewed the 21 May 2008 Soil Investigation and Groundwater Investigation Report, <br /> Tracy Byron Road Project, Tracy, San Joaquin County. The report was prepared for Chevron <br /> Environmental Management Company (Chevron) by Science Applications International <br /> Corporation (SAIC). <br /> The purpose of the investigation was to evaluate the extent of soil and groundwater impacts <br /> caused by crude oil leaks from the historical Old Valley Pipeline (OVP) and/or the former <br /> Tidewater Associated Oil Company (TAOC) pipelines. The OVP/TAOCl elines <br /> , previously <br /> operated by predecessors of Chevron and/or Texaco (now Chevron), transferred heated crude <br /> oil from Kern County oil fields to San Francisco Bay area refineries during the early 1900s to <br /> the mid-1960s. Portions of the lines reportedly were removed in the 1970's. <br /> The OVP lies along the south side of the Byron Road right-of-way (ROW) easement. The <br /> TAOC lines are north of Byron Road, and the Union Pacific Railroad (UPRR) tracks are <br /> located between Byron Road and the TAOC lines. Overall, the combined width of the UPRR, <br /> Byron Road, and pipelines' ROW easements, varies between 200 and 240 feet. However, the <br /> area of investigation extends beyond the easements. <br /> The active Kinder Morgan Energy Partners, L.P. refined petroleum product pipeline is present <br /> within the UPRR ROW easement. The Kinder Morgan line(s) transports gasoline,jet A fuel <br /> and/or diesel fuel. <br /> BACKGROUND <br /> Areas of impacted soil/groundwater were identified in 2003 during the excavation and <br /> dewatering well installation associated with construction of the City of Tracy storm drain <br /> beneath Byron Road. According to the previous reports, residual petroleum hydrocarbons, <br /> identified in the dewatering wells are present in soil and groundwater from approximately 5 <br /> feet to 20 feet below the surface. Minor quantities of free-phase crude oil were observed in <br /> soil at a few locations, generally at depths of less than 12 feet. Depth to first encountered <br /> groundwater is approximately 12 to 13 feet. The regional gradient is north to northwest as <br /> determined at adjacent OVP/TAOC projects in the Tracy area. <br /> California Environmental Protection Agency <br /> r'l Recycled Paper <br />