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. Corrective Action Plan BOB'S MUFFLER SHOP 466 Moffat Boulevard, Manteca, California 1.0. INTRODUCTION AND SCOPE OF WORK At the request of Mr.Tom Barbour,and the San Joaquin County Environmental Health Department (EHD)by letter dated 25 September 2002,Advanced GeoEnvironmental, Inc. (AGE), has prepared this Corrective Action Plan(CAP)for466 Moffat Boulevard,Manteca,California.The scope of the CAP was to evaluate the feasibility and cost aspect of several remedial action alternatives for hydrocarbon-impacted soil and 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 situated in a commercial area of Manteca and consists of a roughly trian lar parcel of g Y � land bordered on the northeast by Moffat Boulevard. Structures on the site include one small ' building which formerly housed the muffler shop, a tall canopy and two former pump islands. The site setting is illustrated.in Figure 1. The layout of the property and locations of wells and soil borings are depicted in Figure 2. 1 2.1. REGIONAL GEOL:OGICALIHYDROGEOLOGICAL SETTING ' ' The site is situated within.the e 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 Delhi-Veritas-Tinnin soil. Delhi-Veritas-Tinnin soil is located on dunes, alluvial fans and ' low fan terraces, and generally consists of moderately well-drained to somewhat excessively drained, coarse-textured and moderately coarse textured soils that are deep to a cemented hardpan or are very deep. Advanced GeoEnvironmental,[ne.