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i 02 March 2000 AGE-NC Project No 98-0452 Page 3 of 5 34 LABORATORY ANALYSIS With approval by the PHS-EHD, soil samples and grab ground water samples collected from the borings were not analyzed due to the lack of field indications of petroleum hydrocarbons ' 3 5 MONITORING WELL PURGE PROCEDURES On 29 November 1999, a Solmst water level meter was used to measure the depth to ground water I in the three wells relative to the tops of the well casings The ground water elevations and gradient were determined from this data (Table 1) ' After recording water level measurements, a two-stage submersible pump was used to purge each monitoring well of standing water Approximately 12 gallons of water were removed from each well (approximately 3 well casing volumes) Ground water temperature, pH and conductivity were ' measured at regular intervals during the purge process using a Hydac water analyzer Field data sheets are included in Appendix C Purged water was stored on site in labeled, 55-gallon DOT- lie approved drums ' 3 6 COLLECTION OF GROUND WATER SAMPLES Water samples were collected from each purged well using new disposable plastic bailers Each ' water sample was transferred into 40-m1 VOA vials containing 0 5 ml 18% hydrochloric acid as a sample preservative, and into 1-liter glass amber bottles without a preservative After collection, the samples were properly labeled,placed in a chilled container and transported under chain-of-custody ' to McCambell Analytical Laboratories, Inc , and were analyzed for • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in ' accordance with EPA Methods 5030/8015m and 3550, • Volatile aromatics benzene,toluene,ethylbenzene and xylenes(BTEX)with methyl tertiary- butyl ether (MTBE) in accordance with EPA Method 602/8020, and • Oxygenated fuel additives MTBE, tertiary butyl alcohol (TBA), di-isopropyl ether(DIPE), ethyl tertiary butyl ether(ETBE), and tertiary amyl methyl ether(TAME) in accordance with ' EPA Method 8260-Modified 1 • ' Advanced GeoE nviro n mental,Inc 1