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1 <br /> , I <br /> , y <br /> 1 <br /> ` 15 November 1996 <br /> AGE-NC Project No 95-0144 <br /> Page 2 of 4 <br /> purged well using new disposable bailers Samples were transferred into 40-m1 EPA vials and 1-liter <br /> ' amber bottles Each sample was transported in a chilled container to McCampbell Analytical, Inc <br /> (MAI) and analyzed for total petroleum hydrocarbons quantified as gasoline (TPH-g), diesel (TPH- <br /> d), and motor oil (I'PH-mo), volatile organic compounds (benzene, toluene, ethylbenzene and <br /> 1 al xylenes, BTE&X) with methyl-tertiary-butyl-ether, (MTBE) in accordance with EPA methods <br /> 8015m and 602, respectively <br /> 1 1 t <br /> x. 3.0 Y FINDINGS <br /> 1 13 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> f <br /> a <br /> a , <br /> The relative elevation of ground,�ater in each well was calculated by subtracting the depth to water <br /> from the surveyed casing elevation (Table 1) Ground water rose an average of 1 74 feet between <br /> February and May 1996 and rose an average of 047 feet between,May and August 1996 The <br /> ' approximate gradients for the May1996and August 1996 monitorings were calculated to be 0 0048 <br /> ft/ft and 0 0053 ft/ft, respectri ely,with a northerly flow direction Ground water elevation contours <br /> derived from data collected on 07 May and 07 August 1996 are depicted in Figures 3 and 4 <br /> 11 1 1 Ia <br /> 4 <br /> 1 32 ANALYTICAL RESULTS OF WATER SAMPLES <br /> During the May 1996 monitoring event, TPH-g was detected in wells MW-1, MW-2, MW-5 and + <br /> ' MW;13 at concentrations as high as 2 000 parts per billion (ppb, reported as micrograms per liter), <br /> 'TPH-d was detected in wells MW-1, MW-2, MW-5 and MW-13 at concentrations as high as 490 <br /> ppb TPH-mo was detected in MW-1 and MW-2 at concentrations of 180 ppb and 410 ppb, <br /> ' respectively BTE&Xcomponents were detected in samples fiom MW-1 and MW-5 at <br /> concentrations as high as 570 ppb, benzene was detected at 25 ppb in MW-1 <br /> IDuring the August 1996 monitoring event, TPH was detected in wells MW-i, MW-5 and MW-13 <br /> at, concentratzons`as high as 330 ppb 'Benzene and toluene were detected in wells MW-1 at <br /> concentrations of 2 3 and 8 3 ppb, respectively Ethylbenzene and/or xylenes were sporadically <br /> ' detected in wells MWA, MW-4, MW-5 and MW-13 at concentrations as high as 84 ppb <br /> a <br /> Analytical results of ground water samples are summarized on Tables 2 and 3 The laboratory reports <br /> (MAI Laboratory F D Dios 64909 - 64917 and 67763-67771) and chain-of-custody forms are <br /> included in Appendix B ry <br /> I <br /> h 1 5 I I <br /> v 1 <br /> a <br /> I 1 1 <br /> II I 1 1 <br /> i <br />