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Kennedy/Jenks Consultants Section 3: Proposed Hydrogeologic Investigation Activities Two primary types of activities are proposed in this work plan: completion of a number of specific investigations at areas of observed variability in groundwater quality and installation of additional groundwater monitoring wells. 3.1 Analysis of Groundwater Quality Variability Several historical land uses occurred adjacent to and within the facility. These various land use areas will be evaluated to assess potential impacts to groundwater at the facility. 3.1.1 Groundwater Flow Conditions at the Facility Groundwater levels have been measured approximately monthly for the expanded suite of monitoring wells. This information (Figures 5 and 6) indicates that groundwater gradient and direction vary with both time and location within the facility. In order to evaluate the potential impacts of offsite land uses on groundwater quality, groundwater levels will be measured monthly until June 2010. This dataset will be used to further characterize the variability in groundwater flow direction and gradient. Estimates of linear groundwater velocities at the facility will also be calculated to provide more information about the rate of groundwater movement and potential impacts on groundwater variability. Values for hydraulic conductivity and effective porosity used for anti-degradation analysis (Kennedy/Jenks 2009a) will be used for these calculations. 3.1.2 Dairy Impacts from the North and East A study of shallow groundwater quality in the vicinity of dairies in the northern San Joaquin Valley was conducted in the late 1990s and concluded that nitrate and salt impacts to groundwater occurred beneath dairies with irrigated forage crops (Harter 2002). The author notes that because manure management practices at the dairies included in the study are representative for the region, the results of the study are reasonable for other dairies in the region. To assess potential groundwater impacts from the dairies to the north and east of the facility, the groundwater flow analysis summarized above will be used to confirm that occasional north- to-south flow occurs. Publicly available information about the adjacent dairies, including site operational practices, number of animals, manure management, and irrigation practices will also be reviewed. 3.1.3 Stormwater Basin The stormwater pond at the facility receives flows draining from roofed areas and surrounding surface areas that are not mixed with process water. The pond has a capacity of approximately 4.9 million gallons (MG). Stormwater quality has been monitored at the facility since 2002 whenever there is enough water in the stormwater pond to allow sample collection. The water depth in the stormwater pond is generally very low, which makes collection of representative Hydrogeologic Investigation and Groundwater Sampling and Analysis Work Plan, Page 9 Sutter Home Lodi Winery, Lodi, California 9:gs-gmupbdmin4obkOgN8fi5 SHsuderha ffinpo wdr to Id bydrow plan"As