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09 January 1998 <br /> AGE-NC Project No 96-0235 <br /> Page 2 of 6 <br /> In November 1996, four soil probe borings (B-5 through B-8) were advanced to further assess <br /> hydrocarbon-impacted soil and ground water Soil samples were collected from all four probe <br /> borings and grab ground water samples were retrieved from two probe borings`(B-6 and B-8) 'In <br /> May 1997, monitoring wells MW-4 and MW-5 were installed on the property <br /> The highest concentrations of TPH-g and volatile aromatics (benzene, toluene, ethylbenzene and <br /> xylenes BTE&X)In soil samples collected during well installations were encountered in MW-2 at <br /> a depth of 41 5 feet bsg Analytical results from the soil samples are summarized in Table 3, <br /> analytical results of grab water samples are shown in Table 5 <br /> 1 Y <br /> 2 3 GROUND WATER MONITORING <br />' Ground water monitoring was performed on six occasions between April 1994 and May 1997 The <br /> p Y <br /> highest concentrations of hydrocarbons In ground water have been consistently encountered in MW- <br />' 2 Depth to ground water,data is summarized on Table 4 Analytical results of all ground water <br /> samples collected at the site are summarized on Tables 5 and 6 <br /> 10 <br /> The surface of the ground water table has been above the tops of the screened intervals in monitoring <br /> wells MW-1 and MW-2 since installation in April 1994 Monitoring well MW-3 has had ground <br />' water above the screened Interval since October 1995 Ground water has remained within the <br /> screened interval for MW-4 and MW-5 since installation in May 1997 <br /> 1 2 4' STOCKPILED SOIL SAMPLING <br /> n <br />' Excavated soil from the former UST over-excavation was stockpiled on site for aeration On 25 June <br /> 1996 and 08 November 1996, AGE sampled the stockpiled soil The results of the analyses are <br /> tabulated in Tables 7-and 8 <br /> 25 EXCAVATION BACKFILLING <br /> Excavation backfilling procedures were performed in April 1997 by DSS Construction Backfill <br /> material was Imported and utilized to fill the excavation to approximately 15 feet below surface <br /> grade (bsg) Stockpiled soil aerated on-site was then utilized to complete the backfill procedure The <br /> area was proposed to be paved with asphalt following completion of the backfill However,surfacing <br />' has not been completed <br />'« Advanced GeoEn\iron mental,Inc <br /> I - i <br />