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08 January 1996 <br /> AGE-NC Project No 95-0104 <br />` Page 3 of 4 <br /> ensure that no air bubbles,%ere present in the VOAs after filling and capping Ground-water sample <br /> containers were labeled with the well designation, date, time, and samplers initials <br /> 3 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> IAfter collection, each sample was logged on a chain-of-custody form, placed in a chilled container <br /> and transported to a Alpha Analytical Laboratories (AAL) for analysis Each sample was analyzed <br /> for TPH-g, volatile aromatics(benzene, toluene, ethyl benzene and xylene BTE&X) and halogenated <br />' volatile organic compounds (HVOCs) in accordance with EPA methods 5030, 602, and 601, <br /> respectively <br /> 1 <br /> 4.0. FINDINGS <br /> 4 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> The relative elevation of ground water for this quarter is depicted in Table 1 The data indicated that <br /> ground water flow beneath the site was generally to the northeast at a gradient of about 0 0013, or <br /> approximately 7 feet per mile The ground water elevation rose approximately 1 37 feet in MW-2, <br />' 141 feet in MW-3, and 1 37 feet in MW-4 between July and October 1995 <br /> In October 1995, ground water gradient at the site was calculated to be 0 0013 ft/ft (approximately <br /> 7 feet per mile) directed N 71° E (Figure 3) In July 1995, the gradient was calculated to be 0 0015 <br /> ft/ft (approximately 11 feet per mile) directed S 78° E Between July and October 1995, ground <br /> water flow direction beneath the site rotated approximately 31° from southeast to northeast <br /> 4 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> During the Octobersampling, g <br /> 1995 sam lm TPH- was detected in MW-1 at 420 µg/1 (parts per billion ppb), <br /> and in MW-2 at 68 ppb BTE&X were detected in MW-1 at concentrations up to 2 2 ppb (xylene) <br /> Analytical results of TPH-g and BTE&X in ground water are summarized in Table 2 The laboratory <br /> report and chain-of-custody are included in Appendix B <br />' HVO was detected in samples from each well during the October 1995 sampling event at <br /> concentrations ranging from 0 73 ppb(tetrachloroethylene in MW-3) to 340 ppb (1,2-dichloroethane <br />' in MW-1) Analytical results ofHVO analysis are summarized in Tables 3 through 6 The laboratory <br /> report and chain-of-custody are included in Appendix B <br /> 1 <br />