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i Impact to Groundwater ` b ' r Based upon the NRCS data, the site soils are characterized by the following: i 1. Two (2) clayey soils (Jacktone clay and Stockton clay) exist at the site. 2. A cemented pan exists in the Jacktone, Madera, and Manteca soils, between approximately 20" and 40 " and a cemented an exists „ p between 1 , approximately[ pp y 40 and 60 in the Stockton soils. 3. When thoroughly wetted, Manteca soils have slow infiltration rates and Jacktone, Madera, and Stockton soils have slow infiltration rates and consist mainly of clay soils with high swellin potential or an impervious layer near the surface. g g 4. Madera soils have very slow permeability, Jacktone and Stockton clays and Manteca soils have moderate permeability. have slow permeability, As mentioned above, the depth to groundwater in the wells located in the neighborhood is approximately 70-90 ft bgs. i Based upon the depths to groundwater and the geological/hydrogeological characteristics of the site soils presented above, it is unlikely that any hazardous chemical present in the liquid/solid manure applied to the fields will infiltrate to such depths and have any impact on the groundwater � quality. i I This dairy system will have a water storage volume that has a capacity greater than the requirements from both the county and state. These capacities will allow for containment of a full I winter's manure volume, an above average winter rainfall plus a 25 year, 24 hour storm water volume. Considering these storage volumes, the manure effluent management system can be managed by l plan, not managed by rainfall events. Well managed irrigation and return water flows, along with wet-dry cycles, will cause surface water not to penetrate the approximate 70-90 feet to groundwater. Ground Water Sampling R To provide base line data in order to evaluate any potential future impacts to ground water by the Dairy p � { y F'acilit y, ground water samples were collected. Samples were taken at nearby wells as shown on the attached Water Sample Locations map, Appendix B. A copy of the Groundwater Sampling Procedures is presented in Appendix B. Irrigation wells were tested by A&L Western Agricultural Laboratories, Inc. for Sodium , Calcium, Magnesium, Chloride, Electrical Conductivity, Sulfate, Nitrate; pH, Carbonate, Bicarbonate, Refer to page 22 for Endnotes and Reference Sources ®Western Dairy Design Associates,Inc.2M3 Page 19 ' r