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08 December 2005 <br /> AGE-NC Project No. 01-0828 <br /> Page 3 of 9 <br /> w <br /> 500-gallon waste oil UST (Tank No. 3) was removed and one sample was collected from the tank <br /> excavation. Analytical results of the soil sample were not provided to the EHD. <br /> 2.3. PREVIOUS SITE ASSESSMENTS <br /> On 04 and 05 October 2001, four soil probe borings(P-1 through P-4)were advanced at the site as <br /> part of the site assessment related to former USTs. The field work was conducted as outlined in the <br /> AGE-prepared Preliminary Site Assessment Work Plan, dated 02 May 2001. Probe borings P-1 <br /> through P-4 were advanced utilizing a truck-mounted Geoprobe 5400 equipped with 1.125-inch <br /> diameter probe rods using"direct push"technology. Probe boring P-1 was advanced vertically to a <br /> depth of 48 feet bsg for collection of soil and grab ground water samples;however,refusal at 48 feet <br /> bsg prevented further advancement of the sampling rods and a water sample could not be collected. <br /> Boring P-2 was advanced to 65 feet bsg for collection of soil and grab ground water samples;borings <br /> P-3 and P-4 were advanced vertically to a depth of 20 feet bsg for collection of soil samples. <br /> Soil samples were collected at 5-foot intervals to total depth in borings P-1, P-3, and P-4; soil <br /> samples were collected from boring P-2 at 5-foot intervals from 5 feet bsg to 30 feet bsg. A grab <br /> ground water sample was collected from probe boring P-2 using a temporary polyvinylchloride <br /> (PVC) screen. The probe rods were advanced to a depth approximately 4 feet below the inferred <br /> water table. <br /> ` Total petroleum hydrocarbons quantified as gasoline (TPH-g) was detected in soil samples P1-25, <br /> P 1-40,and P 1-45 at concentrations of 130 mg/kg,20 mg/kg,and 130 mg/kg,respectively.However, <br /> the laboratory report noted that the detections have no recognizable pattern and that soil samples <br /> P 1-25 and P 1-45 contain strongly aged gasoline or diesel range compounds.Benzene,ethylbenzene, <br /> and xylenes were detected in the same samples at concentrations as high as 0.019 mg/kg, <br /> 0.11 mg/kg, and 0.12 mg/kg, respectively. Total petroleum hydrocarbons quantified as diesel <br /> (TPH-d) was detected in soil samples PI-25, P l-40, P 1-45, and P2-30 at concentrations of <br /> 4,700 mg/kg, 1,800 mg/kg,3,700 mg/kg,and 9.1 mg/kg,respectively.Total petroleum hydrocarbons <br /> quantified as motor oil (TPH-mo) was detected in soil samples PI-25, PI-40, and PI-45 at <br /> concentrations as high as 1,400 mg/kg, 570 mg/kg, and 1,200 mg/kg. Soil sample P3-15 contained <br /> concentrations of chromium,lead,nickel,and zinc at background levels.Grab ground water sample <br /> w P2-H2O/10-05-01 contained TPH-d,toluene,and tertiary-butyl alcohol (TBA)at concentrations of <br /> 200 micrograms per liter(µg/1), 1.0 µg/1, and 8.1 µg/1, respectively. <br /> Historical analytical results of soil and grab ground water samples are summarized in Tables 1 <br /> through 3. <br /> Advanced GcoEnvironmental,Inc. <br /> L <br />