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--AVV A <br /> ?';tr Working To Restore Nature <br /> are included in RESNA's November 12, 1993 "Phase II Problem Assessment Report". Soil and <br /> G <br /> F groundwater analytical data are summarized in Tables 1 and 2, respectively. <br /> kkr <br /> is <br /> 3.0 SITE SETTING/SUBSURFACE CONDITIONS <br /> The project site is situated on level terrain comprised of Quaternary to Recent alluvial sediments. <br /> The site is bounded on the southern property line by the westerly flowing Smith Canal (Figure <br /> 1). Groundwater flow is currently north-northwesterly, away from the canal. Near surface <br /> sediments in the area consist of interbedded sands, silts, clays, and gravels. As is typical of <br /> alluvial environments, higher permeability zones representing former stream channels occur as <br /> sinuous or lenticular features. <br /> Soils encountered beneath the project site consist predominately of clays and silts to an <br /> I=_� P j P Y Y <br /> approximate depth of 8 feet in the eastern portion of the site and 24 feet in the western portion <br /> j_ of the site. Silts and sands exist below the clay to a depth of at least 36 feet, the maximum <br /> depth explored. Much of the site has been overlain with imported gravel to a depth of 2 to 4 <br /> feet. The gravel fill extends to a depth of approximately 16 feet in the vicinity of the former <br /> tank location. <br /> i Groundwater beneath the site in February 1994 was encountered between approximately 11.4 <br /> and 15.3 feet below ground surface. Groundwater flow was to the northwest under a gradient <br /> �J <br /> rr1 of 0.011 ft/ft, or approximately 60 feet per mile. Historical groundwater elevations are <br /> summarized in Table 3. <br /> rfr� <br /> 3.1 Assessment of Soil Contamination <br /> f y: <br /> Analytical results of soil samples collected in the vadose zone (less than 11 feet deep) suggest <br /> that shallow soil contamination is somewhat random and not laterally continuous across the site. <br /> { Impacted soil appears to be limited to between 7 and 18 feet below grade with TPHd levels of <br /> up to 1680 ppm. No BTEX constituents are present at significant levels. Soil samples collected <br /> from depths greater than 11 feet below grade are within the saturated zone. The estimated areal <br /> extent of soil impaction at a depth of 15 feet below grade is depicted on Figure 3. Analytical <br /> results of soil samples collected from the site are summarized in Table 1. <br /> a <br /> W03651REPORTSICAP0294.FNL 3 <br /> f <br />