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Kennedy/Jenks Consultants Section 2: Background The Winery is located at 21801 Highway 120 in Escalon, California (Figure 1). Wine making activities have occurred at the Winery since the late 1800's, however, BTQCLC purchased the Winery in 2003. 2.1 Site Setting The Facility and LAA are located in the San Joaquin River Hydrologic Region, Eastern San Joaquin Subbasin (Subbasin 5-22.01). The Subbasin contains three important hydrogeologic formations: the Victor, the Laguna, and the Mehrten. The Laguna Formation (occurring mainly east of the San Joaquin River) is generally coeval to the Tulare Formation (occurring mainly west of the San Joaquin River) (DWR, 1967). The generally coarser-grained Victor Formation extends from the ground surface to about 150 feet below ground surface (bgs) and is underlain by the Laguna Formation. The Laguna Formation is 600 to 1,000 feet thick and is composed of discontinuous lenses of unconsolidated to semi-consolidated sands and silts with lesser amounts of gravel and silt (SJRGA, 1999). 2.2 Site Hydrogeology The hydrostratigraphy beneath the Site consists mainly of poorly graded sand (SP) and silty sand (SM) extending from the ground surface to 80 feet bgs. The existing monitoring well completion reports indicate a hard pan extends across the Site at approximately 10 feet bgs, ranging from 1 to 3 feet in thickness. Beneath the hardpan, a distinct lens of poorly graded sand exists below the northwest corner of the Site (MW-5) and extends southeast across the Site to the Winery Facility area (around MW-3). This shallow poorly graded sand lens varies from approximately 8 to 25 feet thick, with the top of the lens occurring at approximately 85 feet above mean sea level (AMSL) and 15 feet bgs. A deeper distinct poorly graded sand lens extends across the Site, with the top of the lens occurring at approximately 45 feet AMSL and 50 feet bgs. This deeper sand lens is relatively thin below the central part of the Site, as shown in the well completion reports for MW-3 and MW-4. The sand lens then thickens toward the northwest and southeast sections of the Site where the sand lens extends below the well completion depths (Kennedy/Jenks, 2007). The regional groundwater elevations and gradient produce a northwest flow direction, which is similar to north-northwest (NNW)flow direction for groundwater underlying the Site. Groundwater elevation data collected from regional wells in 2003 indicated a regional groundwater gradient of approximately 0.0019 horizontal feet per vertical foot (ft/ft). Historical records indicate that the local groundwater table has declined since the 1950s and 1960s. It is generally understood that this decline in groundwater elevation is due to overdraft of groundwater for domestic and agricultural uses in the Central Valley (Kennedy/Jenks, 2007). Monitoring Well Installation Work Plan, Page 2 Barrel Ten Quarter Circle Land Company, Escalon, California 11SF DGrou pO S-Group%dmin Wob\U030118.27_BTQC LCO-ReportsWW-Install-WP InitexL doc