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6.0 SUMMARY/DISCUSSION OF RESULTS 6.1 SAMPLING SCHEME The soil and groundwater sampling scheme consisted of collecting and retaining for hydrocarbon constituent laboratory analyses a minimum of two soil samples per boring for borings B-1 through B-4. Additional soil samples were retained if obvious signs of contamination were noted. A minimum of two soil samples per boring were collected and retained for hydrocarbon constituent laboratory analyses for borings B-5 through B-8. The soil samples collected from each of the borings B-5 through B-8 were composited by the laboratory for analyses. The discrete samples collected from the boring with the highest composite sample contaminant levels were then submitted for the same analyses. The single discrete sample from borings B-1 through B-4 and the single discrete sample from borings B-5 through B-8 with the highest contaminant levels were subsequently submitted for analysis for CAM 17 metals. The borings in the vicinities of TK1 and TK2 with the most obvious signs of contamination were advanced to groundwater and a groundwater grab sample was collected from each to be analyzed for hydrocarbon constituents. A groundwater grab sample was also collected from the abandoned well to be analyzed for hydrocarbon constituents. The soil samples collected from borings C-1 through C-4 were analyzed for hydrocarbon constituents and total lead. 6.2 DISCUSSION OF RESULTS Laboratory analytical results indicate that soil below approximately 16 to 20 feet bgs has not been impacted by petroleum hydrocarbons at the site. Based on field observations, PID measurements, and ow 1164) NtiiiiiI CONDOR • •lase If Environmental Site Assessment Heritage Square Page 7 Table 3 — Laboratory Analytical Results for Phase II ESA Soil Samples CAM 17 Metals (June 10 and 11, 2002) Sample ID, 3572D -B3-15.5' B5-5-15.5' Constituent Method RL (mg/kg) PRG 6/10/02 6/11/02 Antimony 60108 0.30 31 1.0 Arsenic 6010B 0.30 22 1.2 11 6.8 Barium 6010B 0.40 5,400 100 119 ' Beryllium 60108 0.40 150 ND ND Cadmium 60108 0.15 37 0.60 0,71 Chromium 6010B 0.25 210 42 30 ' Cobalt 6010B 0.25 4,700 13 I1 Copper 6010B 0.35 2,900 44 29 Lead 6010B 0.30 400 6.0 16 ' Mercury 7471A 0.050 23 ND ND Molybdenum 60I B 0.25 390 ND ND Nickel 60106 0.45 1,600 40 31 Selenium 60108 0.30 390 ND ND . Silver 6010B 0.25 390 NID ND Thallium 6010B 0.25 5.2 ND ND Vanadium 6010B 0.25 550 58 52 - - Zinc 6010E 0.50 23,000 56 40 Notes ND= constituent not detected in this sample at or above the laboratory reporting limit Units m}/kg=milligrams per kilogram, pans pennillion 6.0 SUMMARY/DISCUSSION OF RESULTS 6.1 SAMPLING SCHEME The soil and groundwater sampling scheme consisted of collecting and retaining for hydrocarbon constituent laboratory analyses a minimum of two soil samples per boring for borings B-1 through B-4. Additional soil samples were retained if obvious signs of contamination were noted. A minimum of two soil samples per boring were collected and retained for hydrocarbon constituent laboratory analyses for borings B-5 through B-8. The soil samples collected from each of the borings B-5 through B-8 were composited by the laboratory for analyses. The discrete samples collected from the boring with the highest composite sample contaminant levels were then submitted for the same analyses. The single discrete sample from borings B-1 through B-4 and the single discrete sample from borings B-5 through B-8 with the highest contaminant levels were subsequently submitted for analysis for CAM 17 metals. The borings in the vicinities of TK1 and TK2 with the most obvious signs of contamination were advanced to groundwater and a groundwater grab sample was collected from each to be analyzed for hydrocarbon constituents. A groundwater grab sample was also collected from the abandoned well to be analyzed for hydrocarbon constituents. The soil samples collected from borings C-1 through C-4 were analyzed for hydrocarbon constituents and total lead. 6.2 DISCUSSION OF RESULTS Laboratory analytical results indicate that soil below approximately 16 to 20 feet bgs has not been impacted by petroleum hydrocarbons at the site. Based on field observations, PID measurements, and ow 1164) NtiiiiiI CONDOR