Laserfiche WebLink
1 <br /> ' 24 August 2001 <br /> ' AGE-NC Project No 98-0465 <br /> Page 2 of 4 <br /> 22 COLLECTION OF GROUND WATER SAMPLES <br /> Water samples were collected from each purged well using new disposable plastic bailers Each <br /> water sample was transferred into one 1-liter amber bottle with no sample preservative and into three <br /> 40-ml VOA vials containing 0 5 ml 18% hydrochloric acid as a sample preservative After <br /> ' collection, the samples were properly labeled, placed in a chilled container and transported under <br /> sham-of-custody to McCampbell Analytical, Inc (MAI) for analysis The samples were analyzed <br /> for the following <br /> ' G Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br /> accordance with EPA Methods 503018015-Modified and 3 55018015-Modified, respectively <br /> ' 0 Volatile aromatic compounds - benzene, toluene, ethylbenzene and xylenes (BTEX) and <br /> methyl tertiary-butyl ether (MTBE) in accordance with EPA Method 8020, and <br /> ' o Fuel oxygenates - MTBE, di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), <br /> tertiary-amyl methyl ether (TAME), and tertiary butanol (TBA) in accordance with EPA <br /> Method 8260 Modified <br /> ' 3.0. FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data Collected on <br /> ' 13 July 2001, the contaminant impact to ground water was assessed from the laboratory analytical <br /> data <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> ' At the time of the July 2001 sampling event, depths to ground water ranged from 10 72 feet to <br /> 11 71 feet below the tops of the well casings Ground water elevations at the site ranged from 7 98 <br /> feet below mean sea level (MSL) in well MW4 to 8 07 feet below MSL in well MW2 (Table 1) <br /> ' During this monitoring event,the ground water level in the wells was approximately 5 72 to 6 71 feet <br /> below the tops of the well screens, indicating that the wells are screened properly and yield <br /> representative shallow ground water samples The relative ground water elevation at the site <br /> decreased an average of 2 19 feet between the April 2001 and July 2001 monitoring events <br /> Ground water flow varied from northwest to northeast at an average gradient of 0 0007 feet/feet <br /> ' Figure 3 illustrates the contoured ground water elevations as measured on 13 July 2001 <br /> Advanced GeoEnvironmeatai,Inc <br />