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California Kegional Water Quality Conti vi Board <br /> a <br /> Central Valley Region <br /> Katherine Hart, Chair ;' <br /> 1685 1. Strcet.Fresno.California 93706 <br /> Matthew Rodriquez (559)445-5116• FAX(554)445-5910 Edmund G.Brown Jr. <br /> Secrete n),jor. htip:liwwN,.waterboards.ca.govicetitralvallcN Governor <br /> Environmental Protection <br /> 8 December 2011 <br /> Michael Oliphant <br /> Chevron Environmental Management Company <br /> 6001 Bollinger Canyon Road <br /> P. O. Box 6012 <br /> San Ramon, CA 94583 <br /> REVIEW— REVISED SOIL AND GROUNDWATER INVESTIGATION WORKPLAN, AHERN <br /> ROAD-VERNALIS, SAN JOAQUIN COUNTY <br /> Chevron Environmental Management Company (Chevron) submitted a Revised Soil and <br /> Groundwater Investigation Workplan (Workplan), dated 28 November 2011 for a soil and <br /> groundwater investigation at the Ahern Road-Vernalis site (Site). The Site is in the <br /> unincorporated rural community of Vernalis, southern San Joaquin County. The Revised <br /> Workplan was prepared by Science Applications International Corporation — Benham, LLC <br /> (SAIC). <br /> In September 2010, the Central Valley Regional Water Quality Control Board, Central Valley <br /> Region, (Central Valley Water Board) staff approved a workplan to investigate the lateral and <br /> vertical extent of impacted soil and groundwater associated with the Site. Subsequently, <br /> access to residential properties proposed for soil borings was denied by the property owners <br /> and a Revised Workplan was provided. SAIC's November 2011 Workplan proposed <br /> installation of three soil borings at alternative locations where access was available, primarily <br /> along California State Highway 33. <br /> In early December 2011, Central Valley Water Board staff discussed the three proposed soil <br /> boring locations (A, B, and C) with Chevron and SAIC representatives. It was agreed that soil <br /> boring location A would be relocated from the west side to the east side of the highway <br /> approximately 200 feet to the northeast; boring B would be repositioned approximately midway <br /> between A and C, resulting in about a 75 to 85 foot shift of boring B to the northwest. <br /> Central Valley Water Board staff concurs with the Revised Workplan and the repositioning of <br /> the borings. <br /> By 1 June 2012, please submit the soil and groundwater investigation report of findings. <br /> California Envirowitental Protection Agencp <br /> �a Recycled Paper <br />