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*MW ..,f <br /> 1.0 INTRODUCTION <br /> 1.1 General <br /> American Geological Services, Inc. (AGS) has prepared this work plan to initiate a ground water <br /> investigation at the proposed Tosta Dairy In Tracy, California (Figure 1). This work plan has <br /> .- been developed based on direct field observations made by AGS personnel. <br /> 1.2 Site Description <br /> The proposed Tosta Dairy is located on the east side of San Jose Road approximately four miles <br /> northwest of Tracy, California. The site is situated in Section 12, T2S., ME (Figure 1). It is <br /> designated by San Joaquin assessor's parcel number APN: 209-290-07. <br /> 1.3 Background Information <br /> _ The proposed site of the new Tosta Dairy was the locale of dairy operations from at least World <br /> War I up until about eight years ago. At that time the operation was shut down and the herd <br /> slaughtered. <br /> At the present time, new dairy facility is under construction at the site. The plans call for a <br /> facility containing a total of 969 animal units. Solid and liquid wastes from the facility will be <br /> separated with each component going to a separate collection and storage lagoon. <br /> Wastes from the solid and liquid storage lagoons will be distributed as fertilizer over 216 acres of <br /> cropland on which corn and oats will be grown. <br /> 1.4 Site Geology <br /> The Tosta Dairy site is situated on the western side of the Central Valley of California and lies <br /> within the San Joaquin River drainage. From field inspection, the soils underlying the site are <br /> composed of fine grained silts and clays of fluvial origin. <br /> 1.5 Site Hydrology <br /> The owner, Henry Tosta stated that the water table is situated approximately 4-5 feet below <br /> ground surface. However, the character of the soils exposed at the surface and the fact that <br /> several different levels of standing water were observed in lagoons and ditches on the property <br /> suggest that the near surface soils have a low transmissivity. This is supported by the fact that <br /> the water supply wells on the property, which are located near San Jose Road, have an artesian <br /> head. These wells are completed at a depth of approximately 80 feet below the surface, <br /> American Geological Services, Inc. <br /> CA96DE-055 1 <br />