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Interim Remedial Action 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 this work plan for interim remediation at 336 East Locust Street, Lodi, California(site). The scope of work includes the design,operation,and monitoring of a soil vapor extraction(SVE)interim remediation system and dedicated low-flow ground water pump-and-treat interim remediation system at the site. The site and the surrounding area are illustrated on Figure 1;a plan of the site,including soil boring and well locations, is illustrated on Figure 2. The plan was prepared at the request of a Central Valley Regional Water Quality Control Board (CVRWQCB) directive dated 14 September 2006 (Appendix A), and is in accordance with CVRWQCB guidelines for the 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 paved with asphalt and currently contains no standing structures. Two 1,000-gallon gasoline USTs were removed from the site in the mid 1980s. 2.1. REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING According to Geologic Map of California,published in 1977 by the State of California Department of Mines and Geology, the site area is located within the Great Valley Geomorphic Province of California.The Great Valley Province is a nearly flat,elongated structural trough trending northwest and southeast for approximately 450 miles;it is bounded on the east by the Sierra Nevada mountains and on the west by the Coast Ranges. The Province has been filled to its present elevation with thick sequences of sediment ranging in age from Jurassic to present day,creating a nearly flat-lying alluvial plain extending from the Tehachapi Mountains in the south to the Klamath Mountains in the north. The surficial and upper several hundred feet of subsurface layers consists of a great thickness of predominantly unconsolidated alluvial and flood plain deposits (primarily sands, silts, and clays) of Quaternary age, which are derived from the granitic mountains of the Sierra Nevada. Beneath the upper sedimentary deposits lies a thick sequence of marine deposits of Mesozoic age. These marine deposits are further underlain by a pre-Jurassic complex of igneous and metamorphic basement rock. The Province is subdivided into two major divisions, designated the Sacramento and San Joaquin Valleys. The San Joaquin Valley is drained primarily by the San Joaquin River, and the Modesto, Advanced GeoEnvironmental,Inc.