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T <br />' Stockton Plating Inc. <br /> Soil 6 Groundwater Investigation <br /> . April 19, 1994 <br /> Pegs - 4 <br />' which drains into the San Joaquin River. The soils in the area <br /> are fine-grained sands, silts, and clays . <br /> 1 <br /> The subsurface at SPI consists of clay interbedded with <br /> lenses of silt and lesser amounts of well-sorted, fine sand. The <br />' soil is generally light to dark brown from the ground surface to <br /> a depth of approximately 25 feet. At the 25 foot depth, a <br />' distinct soil color change from brown to green (olive brown and <br />' grey-green) occurs . The water table was measured in February <br /> 1994 at a depth of approximately 47 feet below the ground <br />' surface. <br /> There is no indication that the green soil present at 25 <br /> feet below the ground surface was the result of soil <br /> 1 contamination from leaking SPI gasoline tanks . The color change <br />' may be natural or it may be due to petroleum contamination that <br /> has migrated along the water table from another source. The <br />' green soil located above the groundwater table may be an <br /> indication that groundwater has dropped over the past several <br />' years . As the groundwater table lowered, petroleum contaminants <br />' in the groundwater remained in the overlying soils . The green <br /> staining and septic odors in the soils may indicate that <br />' hydrocarbons or other organic materials (i.e. , marsh-like <br /> sediments) are undergoing biological degradation. <br /> I <br /> p CONDOR <br />