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t <br /> t <br /> N 18 April 2001 <br />' AGE-NC Project No 00-0769 <br /> Page 2 of 5 _ <br /> t <br /> the investigation of underground storage tank (UST) sites and sampling ground water m6nitoring <br /> wells " <br /> I <br /> 3 1 MONITORING WELL PURGE PROCEDURES Y <br /> On 26 December 2000 and 30 March 2001, a Solmst water level meter was used to measure the t <br /> depth to ground water in five wells relative to the tops of the well casings (well heads) The ground <br /> water elevations and gradient were determined from this data(Table 1) ; <br />' F After recording water level mea surements during the 26 December 2000 monitoring event, a two- <br /> stage submersible pump was used to purge each monitoring well of standing water Approxi n-ately <br /> ` 8 to 45 gallons`of water were removed from each well (approximately 3 casing-water volumes) <br />' Ground water temperature,pH and conductivity were measured at regular intervals during the purge <br /> process using a Hydac water analyzer Field data sheets are included in Appendix A Purged water - <br /> was stored on site in labeled, 55-gallon DOT-approved drums Ground water samples were not <br />' collected during the 30 March 2001 monitoring event, as requested by the PHS,EHD during a phone <br /> conversation on 29 March 2001 <br /> 32 COLLECTION AND LABORATORY ANALYSIS OF,GROUNDWATER SAMPLES <br /> 1 , <br /> Following purging and allowing a minimum of 80% recovery of initial water volume in the wells, <br /> water samples were collected from each purged well using new disposable plastic bailers Each water <br />' sample was transferred into laboratory-supplied 40-nrJ VOA vials containing 05 ml 18% <br /> hydrochloric acid as a sample preservative' After`collection, the samples were properly labeled, ' <br /> placed,inn,a chilled container and transported under cham-of-custody to McCambell Analytical <br /> Laboratories, Inc and were analyzed for <br /> Total petroleum hydrocarbons quantified as gasoline (TPH-g) mn accordance with EPA <br />' `Methods 5030/8015m, <br /> • BTEX and methyl tertiary,-butyl ether(MTBE) in accordance with EPA Method`602/8020, w <br /> and <br /> IOxygenated fuel additives-MTBE, tertiary butyl alcohol(TBA), di-isopropyl ether(DIPE), � <br /> ethyl.tertiary butyl ether (ETBE), tertiary-amyl methyl ether (TAME), ethylene dibromide _ <br />' (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260-Modified <br /> 1 <br /> 5 <br /> t r <br /> h � c <br /> Advanced GeoEnvironmenral,Inc <br /> a <br /> It <br /> , it <br />