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MIZIMI <br /> M Man <br /> Several of those samples were contaminated with petroleum <br /> hydrocarbons (Figures 2 and 3) . However, no halogenated <br /> volatile organics, PCBs, benzene, toLuene, xylene or <br /> ethylbenzene were detected in any of the samples (See <br /> Laboratory Reports orts 4n A ppendix A) . <br /> PREVIOUS SOII, CHARACTERIZATION <br /> �. Two soil units were identified by Cal Tank Testing during <br /> their tank removal work. The upper unit is predominantly <br /> sandy and extends from the ground surface to a depth of 4 <br /> M feet. Beneath this unit the soils are silty clays with low <br /> i„ <br /> pe.rme bility that extend to an undetermined depth. Within <br /> f ; <br /> the boundaries of the :ormer excavation, the fill material <br /> replaced the sandy unit and extends from the surface to the <br /> bottom of the excavation. The depth of th_s fill material is <br /> shown in Figure 3. <br /> HYDROLOGY <br /> i <br /> Ground surface elevation at the site is approximately 18 feet <br /> above mean sea level (MSL) . Regional information supplied by <br /> s the City of Stockton Public Works Division reported <br /> aroundvrater levels in the Spring of 1989 at 18 feet below <br /> . MSL. Thus, the static groundwater level is probably between <br /> 35 and 40 feet below the ground surface. Groundwater levels <br /> were `r feet higher during the Spring of 1984. Groundwater <br /> gradients measured during the Spring of 1984 and 1989 showed <br /> the groundwater flowing in a southwesterly direction. <br /> SCOPE OF WORK <br /> The scope of this work was to obtain a preliminary assessment <br /> of the vertical and horizontal extent of any contamination . <br /> that may have remained in the soil following removal of the <br /> 5 <br />