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California P ,;ional Water Quality Cont-1 Board Central Valley Region �"'' <br /> a <br /> Katherine Hart,Chair <br /> Linda S.Adams i 1020 Sun Center Drive 9200,Rancho Cordova,California 95670-6114 Arnold <br /> Secretaryfor Schwarzenegger <br /> Environmental Phone(916) acerb a •FAX(9ce 464-4645 n�® Governor <br /> Protection http://tiMw.waterboards.ca.gov/centralvalley }1�U1\\\`Ifl <br /> FC) <br /> � <br /> p,�G 11 <br /> 6 August 2010 ENS �{EAL1H <br /> ENv1 RM1 �S�R�t�ES <br /> PE <br /> Mr, John MacLeod <br /> Chevron Environmental Management Company <br /> 6001 Bollinger Canyon Road, Room K2276 <br /> San Ramon, CA 94583 <br /> CONDITIONAL NO FURTHER ACTION DETERMINATION, CHEVRON CORRAL HOLLOW <br /> AND GRANT LINE ROADS, TRACY, SAN JOAQUIN COUNTY <br /> California Regional Water Quality Control Board, Central Valley Region (Central Valley Water <br /> Board) staff reviewed the following reports: <br /> • 28 April 2009 Site Closure Report (Report) <br /> • 8 July 2010 Request for Well Abandonment (Letter) <br /> ARCADIS prepared the reports on behalf of Chevron Environmental Management Company <br /> (Chevron) for the Corral Hollow and Grant Line Roads Site in Tracy (Site). <br /> Chevron operates an underground, refined fuel pipeline at the Site that runs underneath Grant <br /> Line Road. The Site is at the intersection of Corral Hollow and Grant Line Roads and is <br /> surrounded by mixed residential and commercial development. In 1987, about 870 gallons of <br /> refined fuel were released from the pipeline during installation of dewatering wells by the City <br /> of Tracy. Chevron repaired the pipeline and recovered about 840 gallons of fuel. <br /> In 1987, Chevron excavated about 2,100 cubic yards of contaminated soil during repair of the <br /> pipeline, installed three monitoring wells, and began groundwater monitoring. Between 1991 <br /> and 1996, Chevron drilled 11 additional monitoring wells. By 2001, nine of the 14 monitoring <br /> wells were properly abandoned during road construction along Grant Line Road and <br /> development of the property north of the Site. Concentrations in all the abandoned wells had <br /> been below water quality objectives (WQOs) for several quarters prior to well destruction. <br /> Three wells continued to be sampled semi-annually, and petroleum hydrocarbon <br /> concentrations are stable but slightly above the WQOs for total petroleum hydrocarbons as <br /> gasoline, total petroleum hydrocarbons as diesel, benzene, and naphthalene. In 2010, the <br /> City of Tracy will widen Grant Line Road, and the rest of the wells will be destroyed. The <br /> remaining groundwater concentrations are below Grant Line Road. As described in the <br /> attached memorandum, the remaining levels of petroleum constituents do not pose a threat to <br /> human health, the environment, or waters of the State. <br /> Chevron has satisfactorily completed Site investigation and remedial action and achieved <br /> applicable remedial action standards and objectives. A permanent remedy has been <br /> accomplished at the Site. Therefore, no further action is required. This No Further Action <br /> California Environmental Protection Agency <br /> Za Recycled Paper <br />