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Monitoring Well Installation Work Plan YAMADA BROS. 15406 South Tracy Boulevard, Stockton, California 1.0. INTRODUCTION At the request of Mr. Bob Yamada, Advanced GeoEnvironmental, Inc. (AGE) has prepared the enclosed Monitoring Well Installation Work Plan for the property located at 15406 South Tracy Boulevard, Stockton, California. The location of the site is illustrated in Figure 1 and a plan of the site is illustrated in Figure 2. This Work Plan is prepared as directed in verbal discussions with the San Joaquin County Environmental Health Department (EHD), and is in accordance with the Central Valley Regional Water Quality Control Board(CVRWQCB)guidelines forthe subsurface investigation of UST sites. 2.0. BACKGROUND The site is located on Union Island,on the east side of South Tracy Boulevard,south of Clifton Court Road and north of the Grant Line Canal, north of the City of Tracy in San Joaquin County, California. The site is located in the northern half of Section 29, Township 1 South, Range 5 East, Mount Diablo Base and Meridian, in an area of low topographic relief at an elevation of approximately 3 feet above mean sea level (Union Island Quadrangle, 7.5-Minute USGS Topographic Series, 1978). The site and surrounding area is utilized for agricultural purposes. 2.1. REGIONAL GEOLOGIC/HYDROGEOLOGIC CONDITIONS The property 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,extending from the Tehachapi Mountains in the south to the Klamath Mountains in the north. The western and eastern boundaries of this province are 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 origins. The northern and southern portions of the Great Valley Province have been designated the Sacramento and San Joaquin Valleys, respectively. The Modesto, Riverbank and Turlock Lake Formations and overlying recent alluvium are the principal source of domestic ground water in the 13,500-square-mile San Joaquin Valley Ground Water Basin (Basin 5-22). This basin is drained primarily by the San Joaquin River. Ground water is considered to be of beneficial use and is used for domestic, industrial and commercial purposes. Three domestic wells are located approximately 150 feet southwest of the former UST location. According to Mr. Bob Yamada, bottled water is used for all drinking water and cooking at the site. Advanced Geo Environmental,Inc.