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Soil Testing Work Plan AQUA POOL & SPA FACILITY 2111 Moffat Boulevard,Manteca, California 1.0. INTRODUCTION At the request of Mr. Don Milam of the City of Manteca Public Works Department, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Soil Testing Work Plan for the collection of samples beneath the porous concrete parking area at the Aqua Pool & Spa Facility, 2111 Moffat Boulevard, Manteca, California(the site). The location of the site is illustrated on Figure 1. A plan of the site is illustrated on Figure 2. This work plan was prepared as required by the San Joaquin County Environmental Health Department (EHD) for the procurement of a soil boring permit; Appendix A of Tri-Regional Recommendations - Reporting, dated 30 August 1991, prepared by the Central Valley Regional Water Quality Control Board for the investigation of underground storage tank(UST)sites,was used as a guideline for preparation of this work plan. 2.0. BACKGROUND The property is located in Manteca, California,near the intersection of Moffat Boulevard and East Woodward Avenue, and immediately east of the Union Pacific Railroad track (Figure 1). 2.1. REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING The site is situated within the Great Valley Geomorphic Province of California, a large, elongate, northwest-trending, 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 that extends from the Tehachapi Mountains in the south to the Klammath 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 found 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.The Modesto,Riverbank,and Turlock Lake Formations and overlying Recent alluvium are the principal sources of domestic ground water in the 13,500-square mile San Joaquin Valley Ground Advanced GeoEnvironmental,Inc.