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Corrective Action Plan S MANTECA CITY CORPORATION YARD I210 East Wetmore Street, Manteca, California 1.0 INTRODUCTION AND SCOPE OF WORK At the request of Mr Frederic Clark of the City of Manteca and by directoin from the San Joaquin County Environmental Health Department (EHD) by letter dated, 20 June 2003, Advanced GeoEnvironmental, Inc (AGE), has prepared this Corrective Action Plan (CAP) for 210 East Wetmore Street(site),Manteca,California The scope of the CAP was to evaluate the feasibility and rcost aspect of two comparable remedial action alternatives for methyl tertiary butyl ether(MTBE)- impacted ground water at the site The CAP was prepared in accordance with guidelines established by the Central Valley Regional Water Quality Control Board(CVRWQCB)for the subsurface investigation of underground storage tank(UST) sites ' 2.0. BACKGROUND The site is located in a commercial/industnal area of South Manteca, California, at an approximate �• elevation of 35 feet above mean sea level The site is presently occupied by the City of Manteca Corporation Yard Currently the site operates above-ground fuel storage tanks(AS Ts)that have been installed over the former UST pit location There are no other apparent source areas for the identified ' contaminants on the site The site setting is illustrated in Figure 1 The layout of the property and locations of wells and soil bonngs are depicted in Figure 2 ' 2 1 REGIONAL GEOLOGICAL/HYDROGEOLOGICAL SETTING ' The site is situated within the Great Valley Geomorphic Province of California, a large, elongate northwest tending, asymmetric structural trough The Great Valley Province has been filled with thick sequences of sediment ranging in age from Jurassic to Recent, creating a nearly flat lying alluvial plain extending from the Tehachapi Mountains in the south to the Klamath Mountains in the north The western and eastern boundaries of this province are comprised of the California Coast Range and the Sierra Nevada,respectively Rocks composing the basement complex of the province have not been completely defined but are believed to be of metamorphic and igneous origin The Great Valley Province has been subdivided into two major divisions identified as the Sacramento ' and San Joaquin Valleys Based on the General Soil Map from the San Joaquin County Soil Survey, published by the United States Department of Agriculture Soil Conservation Service in 1992, the site is situated within an area of Capay clay soil Capay clay is located in interfan basin or alluvial fan areas, and generally Advanced GeoEnvironmentai,Inc