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1 I � <br /> 1 I <br /> 1 <br /> , 3 <br /> 1A1 4 15 October 2000, , <br /> AGE-NC Project No 96-0232 <br /> P,age5of15 <br /> Y , , <br /> 33 WELL DEVELOPMENT E <br /> I I ' <br /> On 19 July 2000,ground water extraction wells EW-2 and EW-3 were developed utilizing a stainless <br />' steel hand bailer and a Grundfos submersible pump Approximately 160 gallons of ground water <br /> were purged from well EW=2 and approximately 270'gallons were purged from EW-3 until ground <br /> water produced was visually sediment free Purged ground water was discharged from wells EW-2 <br /> and EW-3 to the on-site 5,900-gallon. Baker Tank A field log for extraction well development <br /> activities is included in Appendix E <br /> 1 <br /> 3 3 1 Initial Ground Water Extraction Well Sampling Procedures <br /> 1 <br /> ' The ground water levels from EW-2 and EW-3 achieved a minimum of 80 percent recharge prior <br /> to sample collection Ground water samples were collected utilizing disposable polyethylene bailers <br />' and transferred into EPA-approved 40-m1 VOA vials containing 0 5 ml 18%hydrochloric acid as <br /> a sample preservative and into one-Iiter amber bottles without preservative Care was taken to ensure <br /> that visible air bubbles were not present in the VOAs after filling and capping The ground water <br />' sample containers were labeled with the well designation, date, time, and sampler's initials <br /> Ground water samples collected from EW-2 and EW-3 were logged on a chairs-of-custody form, <br />' placed in a chilled container and transported to a California Department of Health Services (DHS)- <br /> certified laboratory for analysis for the following analytes ' <br /> TPH-g and TPH-d by EPA Method 8015M, <br /> • BTEX with MTBE by EPA Method 8020, <br /> 1 I • <br /> TBA <br /> , DIPS, ETBE, TAME, MTBE, methanol and ethanol by EPA Method 8260M, and <br /> • EDB and 1,2-DCA by EPA Method 8260M <br /> n ' <br />' 3 3 2 Laboratory Results Of Initial Ground Water Extraction Well Samples <br /> { <br /> lid 1 Initial ground water samples collected from EW-2 and EW-3 were submitted to a DHS-certified <br />' J laboratory MTBE was detected in the initial water sample collected from EW-2 at a concentration ` <br /> of 3,300 gg/1 and from EW-3 at a concen#ration of 34 4g/1 None of the other analytes were detected <br /> from EW-2 or EW-3 above the laboratory reporting limits The analytical results from the initial <br />' EW-2 and EW-3 ground water samples are summanzed in Table 2 The laboratory report and chain- <br /> of1custody'forms are presented in Appendix F <br /> 1 1 <br /> ' 1 <br /> Advanced GeoEnvironmentnl,Inc. <br /> w 1, <br />