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30 October 1998 <br /> AGE Project No. 95-0118 <br /> ? Page 5 of 6 <br /> =# 3.3. SOIL PROFILE <br /> Silt and silty-clay were encountered during drilling of the wells from the surface to a depth of 15 <br /> feet. Inter-bedded silty-clays and fine-to coarse-grained sands were present in the borings from 15 <br /> to 25 feet in borings. Mostly coarse-grained sands were present in the borings at 35 feet bsg. <br /> Two borings had inter-bedded silty-clays and fine-to coarse-grained sands present at depth of 35 to <br /> 44 feet bsg. Samples indicated the presence of silty sands at depths of 40 to 44 feet in one boring and <br /> clay at depths of 44 feet bsg in two other borings. Water was encountered in borings at <br /> approximately 35 feet. No samples were collected from any borings at depths in excess of 44 feet. <br /> 3.4. FIELD AND LABORATORY RESULTS OF SOIL SAMPLES <br /> Organic vapor was detected in the soil collected at depth ranging from 10 to 40 feet bsg, in selected <br /> borings. Significant concentrations of organic vapor were measured in soil samples collected from <br /> boring VW5,established west of the former UST and dispenser location. The highest concentration <br /> of vapor was measured in soils from depths of 15 and 20 feet from boring VW5,with measurements <br /> as high as 750 parts per million(ppm). Also soil vapor measured from samples collected from the <br /> saturated zone in borings IAS3 and IAS4 had considerable concentrations of organic compounds, <br /> with measurements as high as 278 ppmv. <br /> Five soil samples were submitted to MAI for analysis.Four soil samples collected from site had <br /> detectable concentrations of TPH-g and each sample had detectable concentrations of BTEX: <br /> TPH-g was detected at concentrations as high as 15,000 parts per million: ppm (reported as <br /> ±- milligrams per kilogram) at a depth of 15 feet bsg in boring VW5, which is Iocated directly west of <br /> the former UST area. TPH-g was also detected at a concentration of 87.0 ppm in the soil sample <br /> collected from boring VW5 at a depth of 3 5 feet bsg. <br /> Benzene was not detected in soil samples collected from depths less than 35 feet bsg, while the soil <br /> samples collected from a depth of 35 feet and below had detectable benzene concentrations ranging <br /> from 0.047 ppm to 7.4 ppm. Other BTEX compounds were also detected in borings at concentrations <br /> as high as 2,100 ppm. Laboratory results of soil samples analyzed for petroleum hydrocarbons are <br /> summarized in Table 4. The laboratory reports (MAI Laboratory ID 93028 to 93032), QA/QC <br /> reports and chains-of-custody are included in Appendix D. <br /> 4 <br /> "r Advanced GcoEn v iron mentid,Inc. <br /> a} <br />