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- f'lf1) 25 May 2001 <br /> AGE-NC Project No- 95-0118 <br /> Page 4 of 6 <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction and.gradient were determined from field data collected on <br /> 27 April 2001; the contaminant impact to ground water was assessed from the ground water <br /> laboratory data. Soil vapor samples were collected and analyzed from one event during the quarter <br /> to estimate the mass of hydrocarbons being removed from the soil at the site. <br /> 3.1. RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> The depths to ground water in wells MW-1 through MW-6 and in the air-sparge wells were <br /> measured between 30.75 and 33.47 feet below the tops of well casings; the relativeground water <br /> ' elevations were calculated from well MW-I through MW-6 to be between,66.25 feet and 67.34 feet. � <br /> Ground water elevation at the site increased an average 1.9 feet between the August 2000 and the <br /> April 2001 ground water monitoring events. The ground water elevation data collected-during the <br /> April 2001 ground water monitoring event is depicted in Figure 3. Ground water flow direction for <br /> the area bound by the wells was generally toward the north to northeast at a gradient of 0,005 ft/ft, <br /> '= _= or approximately 26 feet per mile. ' <br /> - i <br /> 3.2. ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected only in. air-sparge well water sample IAS-2 at a concentration of 570 <br /> micrograms per liter(µg/l). Water samples collected from the other wells.did not contain detectable <br /> concentrations of TPH-g. <br /> Total xylenes were detected in the two ground water samples. from wells IAS-1 and IAS-2, at <br /> concentrations of 1.2 ggll and 15 keg/l, respectively. Toluene was detected in ground water collected. <br /> from well IAS-3 at a concentration of 0.66 ILgll. <br /> No fuel oxygenated or lead scavenger compounds were detected above the laboratory reporting <br /> limits. Analytical results of ground water samples are summarized in Tables 2 and 3.The laboratory t <br /> report (Me Campbell Analytical Lab ID 66517 to 66525), Quality Assurance and Quality Control i <br /> (QA/QC)reportand a chain--of,custody form are included as Appendix B. I; <br /> 3.3. SOIL VAPOR EXTRACTION i <br /> During the sampling event, the active blower operated at an extraction flow rate of 60scfm. An <br /> Advanced GeoEnvironmental.Inc. <br /> -I <br /> J <br />