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1 ' 17 July 2002 AGE-NC Project No. 97-0327 ' Page 7 of 10 TPH-g was detected in samples P10-40 and P12-45 at concentrations of 220 milligrams per kilogram ' (mg/kg) and 68 mg/kg,"respectively. TPH-d was detected in samples P10-40, P11-45, P12-45 and P12-55 at concentrations between 2.1 mg/kg (P12-55) and 3,300 mg/kg (P10-40). �r Various BTEX compounds were detected in samples P10-40, P11-45, P12-45 and P12-55 at maximum concentrations of 0.031 mg/kg benzene(P11-45),0.053 mg/kg ethylbenzene(P12-45)and 0.38 mg/kg xylenes (P10-40). MTBE was detected in sample P11-45 by EPA Method 8260M at a concentration of 0.012 mg/kg. ' No other fuel components were detected by laboratory analysis.The analytical results of selected soil samples are summarized in Table 1. The laboratory reports (Castle Analytical Laboratory Reference No. 4392 and McCampbell Analytical Inc. Lab I.D. Nos. 89354 through 89374) and chain-of- custody forms are included in Appendix B. Two soil samples (P11-35 and P11-55) were submitted for laboratory analysis of permeability, porosity, moisture and tota)organic content. Analysis of P11-35 (clayey SAND) found an average permeability of 3 x 1 '011P -5 rosity at 42.16 percent,moisture at 15.1 percent and organic Qntent at 0.9 percent. Analysis o P11-55 (silty CLAY) found an average permeability of 6 x 10�, p rosity at 48.65 percent, moisture at 33.2 percent and organic content at 1.9 percent . The laboratory results ' +�1 of the analysis are summarized in Table 2. The laboratory reports (Cooper Testing Laboratory Job No. 255-022) and chain-of-custody forms are included in Appendix C. t One soil sample (P11-40)was submitted for microbial enumeration and physicochemical laboratory analysis. The results of the analysis indicated that the general microbial enumeration was 9.9 x 105 CFU(colony forming units)per gram, and hydrocarbon-degrading microorganisms were present at ' 1.2 x 105 CFU, or approximately 12.12 percent of the sample. Physicochemical laboratory analysis detected concentrations of nitrate at 48.4 mg/kg, nitrate as nitrogen at 11 mg/kg, ammonia as nitrogen at 22 mg/kg, phosphorus at 31 mg/kg and potassium at 46 mg/kg. Copies of the microbial enumeration and physicochemical laboratory reports are included with Appendix D. ' 3.5. ANALYTICAL RESULTS OF GRAB WATER SAMPLES i Grab ground water samples were collected from soil borings P-10, P-11 and P-12 at depths between '- approximately 60 and 65 feet bsg: TPH-g was detected in grab water samples collected from P-10 and P-12 at concentrations of 350 micrograms per liter(/,cg/1) and 510 ,ug/l; TPH-d was detected in grab water samples collected from P-10, P-11 and P-12 at concentrations as high as 500 µg11. ' Advanced GeoEnvironmental,Inc. 1