Laserfiche WebLink
I Iv I ,I I <br /> sf <br /> 18 April 2003 <br /> ` E <br /> AGE-NC Project Na 97-0333 �u <br /> r <br /> ' Page 5%of 11 <br /> � i l <br /> f A 11 4 <br /> fa ' <br /> i' 3 11,€ WELL MONITORING AND PURGE PROCEDURES <br /> i IIS , i <br /> On r10 November 2002, the depth to ground water was measured at each monitoring well from th'e' 11 <br /> top of each-well casing to the nearest 0 01-foot;utilizing a Solmst water level meter The ground <br /> f i water elevation in each monitoring well was calculated by subtracting the measured depth to ground <br /> water from the surveyed casing elevation (Tabl'e 2) Ground water elevation and vertical gradient <br /> ' data for wells MW-11, MW-12'and MW-13 are depicted in cross section F-F'(Figure'3), ground <br /> water elevations were plotted in plan view for the informal First Zone,Second Zone,Third Zone and <br /> Primary Aquifer Zone hydrogeologic flow units as defined in AGE's Cone Penetrometer Testing Site <br /> Investigation - Fourth Quarter 2000, dated 07 February 2001 (Figures A through 7) I <br /> e I <br /> On 10 and 11 November 2002, approximately 4 to 11 gallons of ground water(a minimum of three <br /> casing-water volumes per well)were evacuated(purged)from wells MW-1 through MW-6 utilizing ` <br /> either disposable polyethylene bailers or Watera Hydro-Lift 11 pump with attached hose-bailer <br /> Temperature,pH and conductivity were measured for stabilization at regular purge-volume intervals ' <br /> from each well using ani Oakton water analyzer,Field data and logs are provided in Appendix D The <br /> purged ground water was transferred to the ground water interim remediation system holding tank <br /> for treatment and disposal , <br /> The multi-level monitoring wells MW i7 through MW-13 were purged utilizing a Watera Hydra-Lift <br /> „i 11 pump equipped with a mechanical arm by lowering and raising a%-inch outer diameter, length- <br /> discretepolyethylene hose a ui ed with a ball-valve water ti throw the to chambers into the <br /> q pp p � p <br /> specific water-charged screened section Approximately%to 5 gallons of ground water(a minimum iC <br /> of three casing-water volumes per well) were purged from the multi-level monitoring wells <br /> Temperature,pH and conductivity were measured for stabilization at regular,purge-volume intervals <br /> " from each well using an Oakton water analyzer Field data and logs are provided in Appendix D F <br /> Multi-level well purged ground water was transferred to the ground water remediation system <br /> holding tank for treatment and disposal f <br /> FI I <br /> F I s <br /> 3 2 GROUND WATER SAMPLING <br /> f I <br /> 1 1 <br /> f� <br /> Ground water,samples were collected from the purged wells MW-1 through,MW-6 utilizing new, 71 <br /> ' '�2-inch diameter disposable polyethylene bailers, ground water samples were collected from the i <br /> purged wells MW-7 through MW-13 utilizing3/8-inch diameter polyethylene tubing Ground water <br /> samples were transferred into one-liter amber bottles without a preservative and into 40-ml EPA- ' <br /> I approved VOA vials containing 0 5 ml 18% hydrochloric acid-as a sample preservative Care was ' <br /> t taken to ensure that visible air bubbles`were not present in the vials after filling and capping Ground I' i <br /> water sample containers were labeled with the well designation, date, time, and sampler's initials <br /> I I , Advanced GeoEllvlrOnMehtal,inc I <br /> lit <br /> �j #I , I ,' r 14 FF r I fl I <br /> 1 <br /> f I r <br />