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1 <br /> 30 July 1999 <br /> AGE-NC Project No 95-0143 <br />' Page 5 of 8 <br /> used to calculate ground water elevations Surveying was performed by Baumbach& Piazza, Inc <br />' The survey report sheet is included in Appendix C <br />' 2 10 INSTALLATION OF SVE/IAS UNITS <br />' A soil vapor extraction (SVE) unit and an air compressor have been delivered to the site Piping is <br /> currently being installed from the horizontal vapor recovery wells and the vertical vapor extraction <br /> wells to the SVE unit and from the sparging wells to the air compressor Details of the system <br />' installation will be reported in the quarterly report following completion <br />' 3.0. FINDINGS <br /> Ground water elevation and flow direction were calculated from field data, hydrocarbon-impact to <br />' soil and ground water was inferred from laboratory analysis and field observations <br /> 31 STRATIGRAPHY <br /> Fill material was encountered at the site to a depth of approximately four feet bsg Hard silt to silty <br /> clay was encountered between 4 and 13 feet bsg Silty fine sand was encountered at approximately <br /> 13 feet bsg, grading to medium sand with silt at 37 feet bsg A hard clay layer was encountered from <br /> I 37 to 38 feet bsg The thickness of this clay layer is estimated to be approximately 5 feet, based upon <br /> data collected at the Madison site <br /> 32 ANALYTICAL RESULTS OF SOIL SAMPLES <br /> Hydrocarbon-impacted soil was not encountered during trenching for horizontal wells No samples <br /> were collected from the trenches Organic vapor was detected in 78 of the 107 samples collected <br /> from borings SWI through SW23 and VW1 through VW5, at concentrations as high as 6,565 ppm <br /> (VW5 at 10 feet bsg) Organic vapor was not detected in soil samples collected from borings SW6, <br /> SW7, SW8 and SW20 and only low concentrations of organic vapor were detected in several <br /> Iadditional borings PID readings are summarized on Table I <br /> TPH-g was in detected in 29 of the 46 soil samples analyzed during the current investigation at <br /> concentrations as high as 14,000 parts per million (ppm, reported as milligrams per kilogram) <br /> BTEX compounds were detected at concentrations as high as 85 ppm, 800 ppm, 280 ppm and 1,500 <br /> ppm, respectively Analytical results of soil samples are summarized on Table 2 The laboratory <br /> Advanced CeoEnwonmental,Inc <br />