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Y r E ' 02 September 1999 AGE-NC Project No. 98-0468 - Page 2 of 4 , • Total petroleum hydrocarbons as diesel (TPH-d) by EPA Method 8015 Modified. ' Total petroleum hydrocarbons as.easoline TPH-Q by EPA Method 8015 Modified, ' ' Benzene. toluene, ethylbenzene, and total xylenes (BTEX) by EPA,Method8020;and • Fuel oxygenating compounds including di-isopropyl ether (DIPS), ethyl tertiary-butyl ether (ETBE), methyl tertiary-butyl ether (MTBE), avid tertiary-butanol,(TBA). Chain-of-custody protocols were used to document sample custody transfers.from,the field to the ' analytical laboratory". Sample -ch,ain-of-custody forms and laboratory reports are pro-vided in Appendix C. 3.0. GROUNDWATER ELEVATION, FLOW DIRECTION AND GRADIENT ' Ground water monitoring activities included collection of ground water elevation measurements `from site muni€orin2 ,yells MN%1-I through TON1 `=5 (Figure 2): Measurement of depth to ground \\�ater -was performed prior to conducting ground'\vater purging-and sampling procedures at the site. A summary of depth to around v.-ater and ground water ele'ivation measurements is presented in Table 1. �.1. GROUND NATER ELEVATION ' During the August 1999 monitoring eve:lt, tl�e depth to around water at the.site fanged from 9.57 to 10.25 feet below top of well casings (btoc) (Table 1). Ground water elevation at the site ranged from ?.68.to3.17 feet below mean sea level (1\4SL) in well 1�- W� 3-and 411V--1, respectively (Table 1). ' . Ground water elevation in the monitoring wells decreased an average of 2..07 feet from the previous monitoring everlt (May 1999). 3.2. GROU-ND NATER FL01V AND GRADIENT A n'round water elevation contourmap for August1999 is illustrated on Figure '), Based on ground water elevation data, ground water flow direction is inferred 'to be to the north-northeast. Ground water.gradient for May 1999 was calculated-to be 0.0096. In general, ground water flow direction and gradient for August 1.999 appear to be consistent with previous monitoring events results. .4di-at?ced Cci,FnN'irunmcntal.Inc.