SITE INFORMATION AND CORRESPONDENCE

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Phase I Environmental Site Assessment 3.0 SITE DESCRIPTION The following sections describe the Site location and summarize the physiographic,geologic,and hydrogeologic setting. Descriptions of the vicinity characteristics and past and present land uses of the Site are also included in this section. 3.1 LOCATION The Site consists of one parcel totaling approximately 2.6 acres that is located west of Interstate Highway 5,approximately 1.5 miles south of its intersection with State Highway 12. The subject property is described as a portion of San Joaquin County Assessor's Parcel Number 055-130-16,and a part of the property addressed as 12751 North Thornton Road,Lodi,California. The area of the Site is mapped on the Terminous Topographic Quadrangle,California,United States Geological Survey 7.5-minute series topographic map and lies in Section 24,Township 3 North,Range 5 East,Mount Diablo Base and Meridian(Figure 1). 3.2 ENVIRONMENTAL SETTING 3.2.1 Regional Physiographic Conditions The property is situated in the northern portion of the San Joaquin Valley(Great Valley Geomorphic Province of California)at an elevation of approximately 5 feet above mean sea level. The general topography of the Site is characterized as being level,with berms,drainage channels and lagoons associated with the WPCF bordering the site on the north and east and a vector control facility on the south. The level site occupied by the NCPA Combustion Turbine Project#2 borders the Site on the west. The Site and area landforms are a product of grading and alterations to the landscape resulting from Site development associated with the adjacent WPCF and the NCPA Turbine. The Site lies approximately 1.5 miles east of the intersection/confluence of the Bishop Cut and White Slough. Annual precipitation is approximately 12 inches. 3.2.2 Soil/Groundwater Conditions The USDA Natural Resource Conservation Service,Soil Survey(SCS)has mapped the region and identifies the soils in the vicinity of the Site as belonging primarily to the: . Dello loamy sand,drained,0 to 2%slopes The Dello unit soils are generally described as"very deep,very poorly drained,nearly level soil on flood plains." The typical profile is a surface layer of light yellowish brown loamy sand to about seven inches below the surface,with an underlying pale brown and light gray mottled sand to the described depth of 60 inches below the surface. It is likely the natural soil profile has been disturbed by the development/structural improvements observed at and adjacent to the Site. Groundwater flow is considered to be governed by topography,subsurface geologic conditions(rock units/aquifers),and geologic contacts. Aquifer conditions underlying the Site are characterized as a sedimentary basin system with aquifer zones controlled by sediment grain size and porosity. Groundwater monitoring information at that site(see section 5.3 of this report for well information) indicates the gradient direction is toward the east-southeast and static groundwater level in February 2008 was reported at about 9 feet below the ground surface in monitoring well WSM-2 located near the southeast corner of the Site. 3.2.3 Geologic Conditions The California Division of Mines and Geology Geologic Map of the Sacramento 9uadrangle,California,1:250,000 identifies the underlying sedimentary unit in the area of the project as being the Modesto Formation alluvium-Qml(upper member). The sedimentary material is described as"arkosic alluvium" Lodi Energy Center Property ESA 5 Carlton Project No.6300-01-08 June 2008 CARLTON IM E n g i n e e r i n g I n c.