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KLEINFELDER LO seepage pits. An engineer-designed system was permitted for Lay's restaurant. A summary of the permit information is presented on Plate 3, and copies of the permits are attached. /4. GROUNDWATER Groundwater was not encountered in our soil profile borings drilled for this investigation. Lines of Equal Depth to Groundwater contour maps published in groundwater reports by the San Joaquin County Flood Control and Water Conservation District (1982 to 1999) show �. oundwater levels in the project area ranging from about 120 to 160 feet below gound surface. Based_ on Lines of Equal Elevation of Groundwater contour mops, the groundwater gradient in the proiect area is generally from cast to west. Local gradient variations may occur i. due to well usage. There are no wells located on the subject nroperty, and groundwater is not currently usedat the r.. site. We anticipate that a well will be installed on each proposed residential lots as well as on toe 2ro2osed commercial parcel. We antici ate that the predominant use of&Eoundwater at the residences will be for domestic and landscaping purposes. Although the specific type of commercial establishment to be constructe3 is unknown, we anticipate water usage at the proposed commercial lot will also be for domestic and landscaping purposes. As there are no on-site wells, samples of groundwater were not tested. We do not know of goundwater contamination issue Mime. No underground storage tanks are known to exist on the site and no dairies or gas stations are located adjacent to the site. The potential sources of nitrate in the project area include the grazing of cattle and horses; existing septic systems for single-family housing located in the project area; and any fertilizers, pesticides, and herbicides that may be used for agricultural purposes in the area. After the 2arcels are developed, we anticipate that t P nra-• ce SOf nitrate will include the septic systems, lawn fertilizers, and continued cattle_ an_d horse gran_ing on the proposed 40 acre agricultural parcels. 5. SOIL PROFILE 4 The subsurface conditions at the site were explored on March 17 and 18, 2005, by drilling a • boring in each proposed lot to depths ranging from about 10 to 25 feet below existing grade. The borings were drilled using a Simco 2400 truck-mounted drill rig equipped with 4%-inch O.D. solid-stem auger. The approximate location of the test borings and dimensions from 16w reference points are presented on the Plate 2. The soils observed were visually classified by a representative of our firm according to the Unified Soil Classification System(see Plate 4). Based on our findings, the subsurface soils encountered in our borings varied considerably across the site. The soils observed generally consisted of highly interbedded and discontinuous { strata of low-plastic sandy silt, silty sand, and moderately-plastic sandy clay to the maximum *„ depths explored. Some of these strata were weakly cemented and/or contained gravel. A key LW 55208.GO1/ST05R644 June I,2005 ©2005 Kleinfelder,Inc. Page 3 of 9