Laserfiche WebLink
I - <br /> 27 July 1998 <br /> AGE-NC Project No 95-0130 <br /> Page 3 of 5 <br /> I In June 1998,the gradient was calculated to be 0 005 ft/ft, or approximately 28 feet per nine(Figure <br /> 3) Ground water monitoring data collected In the area of MW-1 through MW-5 suggests that the <br /> ground water flow direction was generally toward the northeast <br /> I <br /> 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> ITPH-g was detected In ground water samples collected from wells MW-2, MW-3, MW-5, VW-IC, <br /> VW-2A and VW-3A at concentrations ranging up to 390,000 parts per billion (ppb, reported as <br /> Imicrograms per liter) <br /> BTE&X compounds were detected In samples collected from wells MW-2,MW-3, MW-5, VW-1C, <br /> VW-2A and VW-3A at concentrations ranging up to 92,000 ppb (benzene, VW-2A) MTBE was <br /> detected utilizing EPA method 8020 In ground water samples collected from MW-3, VW-2A and <br /> IVW-3A at concentrations ranging up to 2,100 ppb <br /> Utilizing EPA method 8260, MTBE was detected In ground water samples collected from 1V1W-3 <br /> and VW-3A at concentrations ranging up to 2,300 ppb TBA was detected In ground water samples <br /> collected from MW-3 at a concentration of 32 ppb TAME, DIPE and ETBE were not detected In <br /> the laboratory analysis of any ground water samples The analytical results for ground water samples <br /> are summarized in Table 2 <br /> The laboratory report(Castle Analytical Laboratory Reference No 1630 and McCampbell Analytical <br /> IInc Lab I D 90574 to 90581) and chain-of-custody form are presented in Appendix B <br /> I4.4. DISCUSSION AND CONCLUSIONS <br />' Based upon data collected during the June 1998 monitoring,AGE concludes <br /> Ground water was Inferred to be flowing toward the northeast at a calculated gradient of <br /> 0 005 ft/ft, or approximately 28 feet per mile (Figure 3) Due to the low gradient at the site, <br /> slight variations In ground water measurements or changes of recharge/discharge of the local <br /> ground water could greatly modify ground water flow direction <br /> I • The ground water surface elevation at the site Is above the slotted screen Intervals in wells <br /> MW-1 through MW-5 and VW-I C,VW-2A and VW-3A Therefore, samples collected from <br /> these wells may not be representative of dissolved petroleum hydrocarbon concentrations In <br /> shallow ground water <br /> • From February to June 1998,substantial dissolved hydrocarbon-concentration Increases were <br /> Advanced GeoEnvfronmental,Inc <br />