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GeoroBica Technw-s-qnc Page 6 Soil Investigation Report Bank of Stockton Project No 443 2 June 19,1996 On July 1, 1996 Welenco arrived at the location for the purpose of conducting a television survey of the well The centralized television camera was lowered into the well on wireline while real time video images were conveyed back to the logging van As is discussed more fully in Section 4 5 below, the well was found to have a total depth of 110 feet 4.0 RESULTS OF INVESTIGATION The data collected during this investigation have been summarized in the following Isections 4.1 Site Geology The site is located on the gradually sloped floor of the San Joaquin Valle The q Y geologic composition of the area is characterized as continental rocks and deposits derived from erosion of the Sierra Nevada Mountain Range located about 50 mules east of Modesto The surface geology is composed of soils that were derived from alluvial fan deposits from rivers draining from the mountains Based on the soil boring logs from this investigation and from groundwater I morutoring wells located nearer the south end of the Property, the upper 12 to 18 inches of the subsurface consists of gravely, imported road base lying atop about 3 to 4 feet of dark gray clay with a plastic texture Below the clay, the soil is a light I yellowish brown to brown clayey silt soil There are thin lenses of sandy material intercalated with the silt i 4.2 Site Hydrology Based of groundwater monitoring data from the five existing monitoring wells on the property, the groundwater surface lies at about 35 feet with a northeasterly trending gradient There is considerable seasonal variation in the depth to groundwater 4.3 Hydrocarbon Distribution in the Soil Below the road base, the soil appeared to be native material in all borings except B5 The material encountered in B5 appeared to be backfill It did not appear similar to the clay found in the other borings and miscellaneous items of debris such a wood splinters and nails were found in the soil cuttings The borehole logs are attached as Appendix D