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10 November 1999 <br /> AGE-NC Prosect No. 98-0433 <br /> Page 7 of 13 <br /> . physicocheinical properties and microbiological enumeration. Data obtained from the <br /> microbiological and physicocbernical. analysis wilt ,be used to determine possible <br /> effectiveness of bio-remediation as a rernediation alternative. <br /> The results of the gro-und water sample laboratory analysis are presented in Section.4.4. Ground <br /> water depth, flow direction, and gradient findings are presented in Section 4.5. <br /> 4.0. FINDINGS <br /> ' Soil in the area east of well MW-1 was found to contain petroleurn h 7droc�srbons at depths of,15 bsg . <br /> lesser concentrations were encountered at 30"feet and 35 feet bsg. Ground \v; fer was inferred to have. <br /> ' a northerly flow dircetion'and was found to be locally lippacted by petroleum irydrocarbons and <br /> oxygenated ffucl additives. <br /> 4.1. STRATIGRAPHY IGRAI I IY MND DEPTH I TO GROUND WATER <br /> ER <br /> Silty sand and sand �vlth a tan or 13ray color, depending on hydrocarbon impact, was gericnilly <br /> encoul-itered from a depth of approximately 5 feet to 10 feet bs��. Gray silty clay was present at depths <br /> between 10 and 15 feet bso. Sand was encountered at depths of 15 and 25 feet bsg in various <br /> locations, white a coarse sar7d appears to extend northwest toward fi-oni the former UST area at a <br /> depth of 25 feet bsg. Soil borings are depicted in Appendix A. A straligraphic cross section is <br /> depicted in Figure 3. <br /> 4.2, I-IYDROCARBONI-l\Il'AC'1'1 D SOIL, <br /> A total of thirty-six soil samples were analyzed for TPH-g. TPl-1-d. BTEX and MT1311 Only twenty <br /> ' soil samples were analyzed for the suite of five fuel additives by l I'A Method 82.60 Modilied. <br /> Soil Probe Borir2,('s <br /> ' •. TPA-g vas detected in 32 of 24 soil samples anal zcd. 'JTlJ was detected at concentnations <br /> 1 Y <br /> aS great <rs 1;300 rl,:Higranl pre kilogram (nig/kg) in soil sample 135-20'. <br /> 1 TPId-g was detected in soil above 20 feet bsg at coizcen#r.ations up to 190 mg/kg (B6-10'). . <br /> -1 PIJ-g %wis 'detected in soil samples at 20 Leet bsg laterally from the former DIST north to <br /> ' boring 135, west to soil boring B5, south to soil bonno 1321. but was nc>t ill soil boring., €.322, <br /> at the sairic depth. <br /> Advewced GeoEmironmentaI,rne. <br />