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� r <br /> '17 December 1999 , <br /> ' AGE-NC Project No 96-0235 i , <br /> k _ Page,4 of 11 <br /> 1 <br /> 2 6 '' MONITORING WELL PURGE PROCEDURES ` <br /> E <br /> On 28 October 1999, a Solinst water level meter was used to measure the depth to ground water'in <br /> "eleven wells relativeto the taps`of the well casings MW-5 was not accessible and therefore-was"not <br /> I measured or purged ,The ground water elevations and gradient were determined from these data <br /> (Table 4) <br /> "After recording water level measurements, a one-stage or two-stage submersible pump was used to <br /> =purge each monitoring well, except for MW-5, of standing water Monitoring well MW-6B was <br /> ' ;purged dry after, approximately 10 gallons of water were removed `Approximately 45 gallons of <br /> ('water were removed from MW-10 to develop the well Approximately 6 to 20 gallons of water were <br /> iremoved from each of the remaining wells (minimum'of�3Fwell casing volumes) For wells with <br /> _ 'ground water above the screened interval, ground water was purged from near the top of the water <br /> column to remove water trapped within the non-screened interval of the well casings Ground water <br /> temperature,pH and conductivity were measured at regular intervals during purging using an ICM <br /> or Hydac water analyzer Field sheets and data are included in Appendix C Purgedwater was stored <br /> on-site in labeled, 55-gallon DOT-approved drums <br /> i � 1 <br /> 2 7 COLLECTION OF GROUND WATER SAMPLES <br /> t Water samples were collected from each purged well using new disposable plastic bailers Each <br /> water sample was transferred into 40-m1 VOA vials containing 0 5 m1 18% hydrochloric acid as a <br /> sample preservative and into 1T liter amber bottles without preservative After collection, the samples <br /> were properly labeled, placed in a chilled container and transported urid'er'chain-of-custody to MAI <br /> 1, F <br />' -and were analyzed for , <br /> 9 <br /> ' - µ1 •, ' `TPH-g,and TPH-d in accordance with EPA Methods 5030/8015m, and <br /> 2 <br /> Volatile aromatic hydrocarbons (BTEX) with MTBE in, accordance with EPA Method'' <br /> 4 <br /> 6i02/8020 <br /> 1l 1 fri n, , <br /> v E '�1 ti r1 i I 1 1 3S Z1 al ' 4 <br /> �Samples'collected from MW-1,MW-2, MW-6B; MW-8A, MW-9 and-MW-10 were also analyzed <br /> i ' F <br /> , for I r ! 1 <br /> i 4 <br /> • Fuel ox ' eriates s,PIPE, ETBE, MTBE, TAME andiTBA in accordance with EPA Method , <br />' 8260 Modified <br /> ! I <br /> 1 1 it <br /> I <br /> I 1 , <br /> • s T ' , ' e ' 1 ` I R ' T 1 <br /> � S L <br /> y, Advanced GeoEnv,ronmental,Inc <br /> ! 1 <br />