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Monitoring Well Installation Work Plan THATER PROPERTY(former TUCKER CONSTRUCTION) 336 East Locust Street,Lodi, California 1.0. INTRODUCTION At the request of Ms. Lucy Thater, Advanced GeoEnvironmental, Inc. (AGE) has prepared the enclosed Monitoring Well Installation Work Plan for the property located at 336 East Locust Street, Lodi, California (site). The scope of work includes the installation, development, survey and sampling of three ground water monitoring wells at 336 East Locust Street, Lodi, California. The location of the site and surrounding area are illustrated on Figure 1. A plan of the site, including existing and proposed monitoring well locations, is illustrated on Figure 2. This work plan is prepared in accordance with Central Valley Regional Water Quality Control Board (CVRWQCB)guidelines for the subsurface investigation of underground storage tank(UST)sites. 2.0. BACKGROUND The site is located at 336 East Locust Street in Lodi,California(Figure 1). The property is partially paved with asphalt and is presently undeveloped. The property was formerly occupied by Tucker Construction Company;two 1,000-gallon gasoline underground storage tanks(USTs)were removed from the site in the mid-1980s. 2.1. REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING 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 that extends 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. The nearest surface water feature in the vicinity of the property is the Mokelumne River,approximately 0.8 miles north of the subject property. The estimated depth to ground water at the property is approximately 30 feet to 35 feet below surface Advanced GeoEnvironmental,Inc.