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12 September 1997 <br /> AGE-NC Project No. 97-0324 <br /> Page 4 of b <br /> 3.5. SURFACE SOIL VAPOR SURVEY <br /> On 20 August 1997 a Micro Mo-1000 organic vapor meter equipped with a flame ionization detector <br /> (FID) was used to determine in any measurable concentrations of methane or other organic vapors <br /> were present at the site. The main area of concern was the sand and gravel mixer on the site. Vapor <br /> measurements were collected from the base of walls and at corners of walls and along the upper <br /> portion of the vault. No detectable vapors were noted during the soil vapor screening. <br /> 4.0. FINDINGS <br /> 4.1. STRATIGRAPHY AND DEPTH TO GROUNDWATER <br /> Silty clay with a tan color was encountered from a depth of approximately 20 feet to 25 feet bsg. <br /> Gray green silty clay was encountered at a depth of 25 feet bsg. The green color of the clay is due <br /> to the high organic marsh like nature of the soils depositional environment not the discoloration due <br /> to contamination. <br /> 4.2. 14YDROCARBON-IMPACTED SOIL <br /> Soil samples collected from each probe boring at a depth of 25 feet bsg were analyzed. TPH-g, <br /> BTE&X and MTBE were present at detectable levels in the three soil samples analyzed. <br /> Laboratory results of soil samples analyzed for petroleum hydrocarbons area summarized in Table <br /> I -Analytical Results of Soil Samples. The laboratory reports (MAI Laboratory ID 80085 to 80087) <br /> QA/QC reports and chains-of-custody are included in Appendix A. <br /> 4.3. HYDROCARBON-IMPACTED GROUND WATER <br /> Grab ground water samples were collected from each probe boring. The depth to ground water in <br /> the boring 10 to 13 feet bsg. TPH-g, BTE&X and MTBE were not detected in any of the water <br /> samples collected and analyzed. <br /> Laboratory results of water samples analyzed for petroleum hydrocarbons area summarized in Table <br /> 2 - Analytical Results of Water Samples. The laboratory reports (MAI Laboratory ID 80082 to <br /> 80084) QA/QC reports and chains-of custody are included in Appendix A. <br /> Advanced GeoEnvironmcntal Inc. <br />