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Upgradient Contributions of Agricultural Effluent and Other Information on upgradient wells were based on the Groundwater Impact Evaluation Report prepared for the City of Escalon's Wastewater Treatment Plant, located at 21500 River Road, Escalon. This facility is situated on the north side of the Stanislaus River, approximately 1.5 miles south southwest of the City of Escalon.s This study is still undergoing monitoring. Other contributions or influences may be Lone Tree Creek, Avena Drain, Little John Creek, City of Escalon percolation ponds, surrounding orchards and vineyards using commercial pesticides, including the several dairies surrounding the referenced property. It is concluded that the variety of soils horizons in this area will contribute to the groundwater flow slowing enough that the travel time from an upgradient well to downgradient well is several years. Rainfall Impact The rainfall in the general area is approximately 12" per year. The area is considered to be arid. The soil is considered to be "moderately well drained". The ground water is approximately 75 feet below the surface, so it is safe to say that down gradient groundwater contamination from rainfall is not likely. The farmed properties involved with this dairy facility are all properly graded to 0.2% of fall to accommodate proper water flow and minimize water runoff and topsoil erosion. All fields have water return systems and are bordered to prevent uncontrolled runoff from the site. Consequently, offsite surface water impact is not likely with proper return water system management and proper field border (berm) maintenance. Ground Water Depth and Gradient It appears from data provided from the San Joaquin County Flood Control and Water Conservation District that the aquifer providing the primary water source in the area lies at a depth of approximately 105 feet below the surface. However, Oakdale Irrigation district wells are much deeper—from 400 to 500 feet and undoubtedly also tap water-bearing units lower in the stratigraphic section. The piezometric surface of the ground water table slopes to the northwest. away from the Stanislaus River, which lies approximately eight miles to the south. Because of the deep ground water depth, it is difficult to determine seasonal variations in ground water elevation. However, Oakdale Irrigation District reported that the water levels vary only about three feet. The lowest levels occur during the summer months when irrigation wells are actively pumped. Refer to page 30 for Endnotes and Reference Sources Soil Suitability Study Property Name and Address: Frank Faria Dairy,Inc., 12182 S. Robinson Road, Escalon,CA 95320 Page 28 'Western Design/David Avila 2001