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• kq KLEINFELDER <br /> ��• interface between petroleum impacted soil and estimated "clean" soil at the time the data was <br /> collected. Please note; additional migration may have occurred since the date of sampling. <br /> Plate 3 illustrates four designated areas, Area A, Area B, Areas C and Area D. Area A located in <br /> the southern portion of the footprint area includes approximately 27,160 square feet and is <br /> estimated to be mostly"clean" soil (based on analytical results from soil samples collected in this <br /> area). Based on data and information obtained from perimeter pushprobes G2, G3 and G4, it <br /> appears petroleum impacted soil constituents were not detected in these perimeter areas at depths <br /> ranging from near surface to 43 feet bgs. Based on this data petroleum impacted soil is not <br /> expected to occur at a significant lateral distance from the mapped footprint area. <br /> Petroleum impacted soil was noted in Areas B, C and D as illustrated on Plate 3. Area B is <br /> located generally in the northwest portion of the footprint area and Area C, shown in three <br /> separate areas is located generally to the north and northeast of the rupture point. Area D is <br /> located east of the rupture point and north of the Chevron pipeline. <br /> The following table of Areas B, C and D, illustrates obvious petroleum impacted soil, the <br /> �1approximate respective areas in square feet, estimated depth of obviously impacted petroleum <br /> 1 soil, in-place volume (not accounting for fluff) and estimated excavated volume at the depths <br /> shown. The estimated excavation volume includes a general 30% "fluff' factor based on <br /> increased volume soil will incur once removed from the ground. <br /> ' ­ Approximate <br /> Approximate Approximate Estimated Average Approximate <br /> 10 Area In-Place <br /> Estimated Arca Depth of Obvious Petroleum 'Excavation Volume <br /> Area <br /> Volume <br /> (Square Feet) impacted soil (cubic yards) <br /> (cu bicards) <br /> B 33,208 5 6,150 8,000 <br /> C 19,716 8 5,840 8,000 <br /> D 12,872 12 5,720 7,440 <br /> TOTAL 65,796 NA 17,710 23,440 <br /> Based on these estimates Kleinfelder estimates approximately 23,440 cubic yards of obviously <br /> contaminated soil remain at the site. Please note this estimate does not include underlying <br /> petroleum impacted soil noted in a leaching (transition zone). Please see the following sections <br /> for discussion. <br /> �j Plate 4 illustrates a plan view of these approximately same areas with the same designations (A <br /> through D), but in an attempt to estimate the interface depths between petroleum impacted soil <br /> �1 and "clean" soil. These estimates were generated to assist in a workplan for remedial activities <br /> and estimating rough potential clean-up costs based on the data and information obtained on May <br /> 19 and 20, 2004. Please note the lateral and vertical migration of petroleum impacted soil will <br /> likely vary over time increasing potential volume and clean-up costs. <br /> Based on analytical data, Area A is expected to be mostly clean soil. The following table of <br /> Areas B, C and D, illustrates the approximate respective areas in square feet, anticipated <br /> excavation depth of remedial activities, and the estimated volume to be removed. As noted <br /> earlier the final excavation volume includes a 30% "fluff'factor. <br /> 44843.T03/STO4RIO25 Page I I of 16 <br /> Copyright 2004 Kleinfelder,Inc. August 6,2004 <br /> II <br />