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Site History <br /> Shell Pipeline <br /> Vemalis Site <br /> I-580 at South Bird Road <br /> Tracy, California <br /> SITE DESCRIPTION <br /> The subject site is located northeast of the South Bird Road Overpass at Interstate 580 (I-580) in <br /> Tracy, California (Figures 1 and 2). The site is owned by Granite Construction Company, Inc. <br /> (Granite)and is referred to by Granite as the Vernalis site. Granite intends to develop the site as a <br /> gravel quarry. <br /> PREVIOUS WORK <br /> A release occurred on April 17,2007 from Shell's "Coalinga" 20-inch, crude oil pipeline. The <br /> Coalinga pipeline is located south of and parallel to I-580 in the vicinity of the site. <br /> Approximately 428 barrels of crude oil were released from the pipeline south of I-580 and west of <br /> the South Bird Road Overpass. Crude oil flowed down an embankment, into an invert on the <br /> south side of I-580, onto the asphalt shoulder and into the south-bound lanes of 1-580, and into a <br /> culvert that crosses below 1-580 and exits into the vacant field of the Vernalis site. The breach <br /> was stopped, and earthen berms were placed around the spill to contain the crude oil, which was <br /> then recovered by vacuum trucks. Approximately 328 barrels of crude oil were recovered during <br /> this initial response. Additional cleanup activities consisted of excavating impacted soils, <br /> cleaning the culvert and replacing piping at the entry and exits, replacing the guard rail <br /> surrounding the Bird Road Overpass, cleaning the concrete surface of I-580, and replacing the <br /> asphalt shoulder of I-580. The Central Valley Regional Water Quality Control Board (RWQCB) <br /> and the United States Environmental Protection Agency (EPA)requested that all areas be visually <br /> clean and any residual soil samples should contain an average of 500 to 1,000 milligrams per <br /> kilogram(mg/Kg)or less total petroleum hydrocarbons as crude oil(TPHcrude). <br /> Soils were excavated from west of South Bird Road between the pipeline and I-580, east of South <br /> Bird Road adjacent to I-580, and northeast of the culvert exit north of I-580 and east of South <br /> Bird Road. Excavation depths ranged from approximately 2 feet below grade (fbg) to 10 fbg. <br /> Approximately 11,959 tons of soil were excavated and transported to Forward Landfill in <br /> Manteca, California. Soil samples were collected from the excavated areas, from beneath the <br />