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• KLEINFELDER <br /> 3 BACKGROUND <br /> Kleinfelder conducted a Phase I Environmental Assessment (File No. 21073.P01) of the subject <br /> site report dated November 12, 2002. During the Phase I ESA an interview was conducted with <br /> Mr. Larry Whitehead of Chevron. According to Mr. Whitehead, "a product pipeline runs through <br /> the southwestern portion of the site". To the best of his knowledge, the pipeline is an 18-inch <br /> crude oil pipeline. Mr. Whitehead stated, "that there were no reported incidents involving <br /> ruptures or leakage for the pipeline." Mr. Whitehead also stated that there are two Pacific Gas <br /> and Electric (PG & E) natural gas pipelines trending through the site." The subject site consists <br /> of agricultural farm property. <br /> According to.Chevron Pipeline Company, an 18-inch crude oil pipeline ruptured on December 4, <br /> 2003 at the subject site, releasing an estimated 750 barrels of crude oil to site soil (approximately <br /> 31,500 gallons). The pipeline carries crude oil from oil fields near Bakersfield to refineries in the <br /> (� Bay Area. The pipeline was reportedly ruptured during ripping of the soil for agricultural <br /> �j purposes. <br /> �l Chevron's consultant Cambria, documented emergency response and oil-impacted soil removal <br /> ^ activities in a report titled "Emergency Response Environmental Report, Country Flags Release, <br /> Spatafore Property, 23577 Mountain House Parkway(Cambria Project #483-1858), dated March <br /> 11, 2004. Chevron workers reportedly arrived on the site on December 4, 2004 in an attempt to <br /> limit lateral migration of crude oil, recover free oil with a vacuum truck and to remove oil <br /> saturated soil. Limited soil sampling and analyses and backhoe exploration was performed to <br /> assess the lateral and vertical limits of oil-impacted soil. Oil impacted soil was reported at <br /> depths ranging from 5 to 9 feet bgs, although vertical migration was noted as "ongoing." <br /> Therefore the oil still appeared vertically mobile, potentially migrating to deeper depths over <br /> 1' time. The apparent lateral extent of oil impacted soil is shown on Cambria's Figure 3 in their <br /> report, which shows an irregular shape area at approximate maximum dimensions of 380 by 380 <br /> feet. <br /> I► <br /> Chevron estimated that approximately 400 barrels were recovered (16,800 gallons) and that <br /> approximately 350 barrels still remain in onsite soil at the site (14,700 gallons). Based upon a <br /> visual survey of oil impacted soil, conducted by Kleinfelder and Siegfried Engineering, Inc. the <br /> area of impacted soil has been estimated to encompass approximately 2.2 acres, extending north, <br /> east, west, and south of the pipeline rupture location (See Plate 2). Based upon aerial photos of <br /> the spill area, it appears the largest amount of oil settled to the east and northeast of the rupture <br /> following the crop lines and surface topography. <br /> Kleinfelder prepared a workplan for a limited soil and groundwater assessment for the purpose of <br /> potentially gathering data for profiling waste for disposal purposes and to assess the lateral and <br /> vertical limits of oil migration. This workplan was titled "Limited Soil and Groundwater <br /> Assessment, Petroleum Pipeline Spill, 23577 Mountainhouse Parkway, Mountainhouse, <br /> California," dated March 22, 2004(File Number 42428 / ST04PI 18). <br /> 44843.T03/ST04R1025 <br /> Copyright 2004 Kleinfelder,Inc. Page 4 of 16 <br /> August 6,2004 <br />