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Kennedy/Jenks Consultants The Younger Alluvium is less than approximately 100 feet thick and consists of those deposits that are accumulating or would be accumulating under natural conditions. The deposits consist of unconsolidated silt, fine-to medium-grained sand, and gravel. Significant quantities of water can be extracted from the coarser-grained deposits in this unit (DWR 2006). r sl 2.2.4 Groundwater Quality i Regional groundwater quality in the vicinity of the facility was assessed through a search of ;d publicly available groundwater data. The search involved querying the California Department of Water Resources (DWR), United States Geological Survey (USGS), and Environmental Protection Agency (EPA) Storet databases, as well as conducting a file review of nearby sites under the oversight of the CRWQCB. The search parameters included the area in Townships 3 �➢ and 4 North, Range 5 East from the Mount Diablo Meridian. Figure 3 shows the results of the well search. ti The time span of the full data set of the most recent total dissolved solids (TDS) or electrical conductivity (EC) results for each well ranges over 60 years from 1949 to 2008. The full data set includes 179 data points and appears to be log-normally distributed. Subsets of the data are tl also summarized below including only data collected since 1977 (110 data points, unknown distribution) and data collected since 2000 (27 data points, unknown distribution). Summary statistics are listed in Table 1. There does not appear to be a spatial pattern to the TDS values, as shown on Figure 3. Except for the data obtained from the four sites regulated by the CRWQCB, the data . summarized in Table 1 and presented on Figure 3 represent groundwater quality in water supply wells. In general, these water supply wells are believed to be screened at depths below the first-encountered groundwater beneath the facility and the adjacent parcels to the north. The data indicate that over a 60-year period of record, TDS concentrations in regional groundwater Li exhibit significant spatial variability. The apparent variability is partially attributable to the lack of well depth data. It is hypothesized that some of the supply wells may be screened at depth intervals with higher ambient water quality (i.e., lower TDS concentrations). The variability in i j TDS concentrations in groundwater may also be attributable to other factors, including the proximity of certain wells to the Delta with its poorer quality water and the proximity of certain wells to agricultural activities and food processing operations. f 2.3 Site Characteristics i� Condor installed seven groundwater monitoring wells near the 15.5-acre LAA and at other locations within the site in 2002. Three additional groundwater monitoring wells were installed to evaluate the sanitary wastewater mound system. Kennedy/Jenks subsequently installed eleven of additional groundwater monitoring wells (GW-8 through GW-18). Figure 4 shows the locations of the existing onsite groundwater monitoring wells. Monitoring well construction details are summarized in Table 2. j c The data from installation of these wells and soil borings advanced at the site in 2008 has been used to characterize the shallow subsurface stratigraphy at the site, including first-encountered — groundwater. Groundwater is generally encountered at depths of less than 10 feet bgs, so wells 41 and borings have only been drilled to a maximum of 16.5 feet bgs. Page 4 Monitoring Well Installation Work Plan , Sutter Home Winery, Lodi, California — gtisymuV�^1^400065W5.13_vAatwme`MsepMCNm;mW"q .L oc Yf