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{ 10 November 1999 <br /> AGE-NC Project No. 98-0433 <br /> 1 Page 6 of 13 <br /> ' B. A suiri.mary of monitoring wvell construction specifications is .presented in "fable I' <br /> Following well installation; the wells were developed in order•to increase water flow into thewell. <br /> and to minimize the amount of fine-gi-ained sediment drawn into the wvell during pumping or bailing. <br /> ' 3.61. GROUND WATER MONITORING ACTIVITIES <br /> ' On 25 August 1999, ground water monitoring activities were performed at the site. Ground water <br /> monitoring activities included the measurement of ground .water levels and collection of ground <br /> water samples for eight site-related monitoring wells (IvIW-1 through-MW-8). <br /> The'water level in each monitoring well was measur•ed.relative to Hie tops of the well casings using <br /> a•Solinst water level meter. After water levels were rileastired, a two-stage submersible pump \,,ias <br /> ' used to purge each well. Six gallons (a minimum of three well volumes) of water were reproved from <br /> m7ells•M1rV-1 through MW-S. '.hemperat>rre; pFf and conductivity oftlie purged water were meast:r:d <br /> at twvo:gallon intervals using an lCM Nv,rter analyzer curing purging, and the values had generally <br /> stabilized by the end of the purging process (Appendix C). Purgedwater vias stored on-site in 55- <br /> gallon, Depar•tnicnt of Transportation (DOT) or United NTations (UN)-approved drums. <br /> �.7. COLLECTION 01, GROUND WATER SAMPLES <br /> Prior to collectionof ground ww'Iaier samples, the depth to ground water was measurcd in each purged <br /> well to ensure that a minimum of 80%`of the well volume had recharged. Water samples were <br /> collected from each well using a new disposable blastic bailer. Each water sample wvas transferred <br /> ' into three chilled 40-nil volatile organic analysis (VOA) vials containing 0.5 ml i S% of hydiochloric <br /> acid as a sample preservative. After collection, the samples wvcre labeled and placed in a chilled <br /> comainer for transportation under cbain--of custody to MAI, a DMS-certified ,imilytical. laboratory. <br /> ' Each sample was analyzed for., <br /> ' TPI-[-g and fITH-d by 1=-t)A Method 5015. Modified for. each molecular range of <br /> laydrocar;bons; <br /> ' BTI X bNr LPA Method 5020; and <br /> • Oxv(:,cnatcd corlrpotrrrds; RIPE,•ETBE, MTBE; TAME and TBA by EPA ivlethod 8260 <br /> il11odJ ficd. <br /> ' One -Yround water sample from well IVIW-1 was transported to an independent <br /> microbiologist, Rrli-. A. Keith Kaufmann of Culver City, California, and was analyzed Ior <br /> :3dvrurrr(CenEn�'irnrurrenl�l, [nc. , <br />