Laserfiche WebLink
1 <br /> lie 02 August 2000 <br /> AGE-NC Project No. 95-0197 <br /> Page 2 of 4 <br /> t ground water had recharged a minimum of 80%. Each water sample was transferred into one 1-liter <br /> amber bottle and three 40-m1 VOA vials containing 0.5 ml of 18% hydrochloric acid as a sample <br /> preservative. Care was taken to ensure that visible air bubbles were not present in the vials after <br /> ' filling and capping. The samples were properly labeled,placed in a chilled container and transported <br /> under chain-of-custody to McCampbell Analytical Inc. (MAI). The samples were analyzed for the <br /> following: <br /> 1 c Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, <br /> respectively) by EPA Method 8015M, <br /> ' ® Volatile aromatic compounds (benzene, toluene, ethyl benzene and xylene: BTEX) with <br /> methyl-tertiary butyl ether(MTBE) by EPA Method 8020, and <br /> ' G Tertiary butanol (TBA), di-isopropyl ether (DIPE), ethyl tert butyl ether (ETBE), tertiary <br /> amyl methyl ether (TAME) and MTBE by EPA Method 8260M. <br /> 1 <br /> 3.0. FINDINGS <br /> 3.1. GROUND WATER ELEVATION AND GRADIENT <br /> ' The depths to ground water from wells MW-1, MW-2,MW-3, and MW-4 were measured between <br /> 13.26 and 13.90 feet below the tops of well casings. Ground water elevations were calculated at 8.40 <br /> feet to 8.67 feet below mean sea level (Figure 3). Ground water elevation at the site increased an <br /> average 0.47 feet between the March 2000 and the June 2000 ground water monitoring events. The <br /> general ground water gradient at the site was calculated to be approximately 0.003 feet/feet or <br /> approximately 0.17 degrees. The general ground water flow direction was calculated to flow towards <br /> the northeast. The ground water elevation contours are depicted on Figure 3. <br /> During this monitoring event, the depths to ground water in the wells are approximately 1 to 4.5 feet <br /> below the tops of the well screens, indicating that the wells are screened properly and yield <br /> representative ground water samples. <br /> 3.2. ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> ' TPH-g was only detected in ground water sample MW-3 at a concentration of 260µg/1. TPH-d was <br /> detected in the samples collected from MW-2 and MW-3 at concentrations of 52 µg/1 and 350,ug/l, <br /> ' respectively. <br /> • Toluene was only detected in ground water sample MW-3 at a concentration of 0.82 µg/l. No other <br /> Advanced Geo Environmental,Inc. <br /> 1 <br />