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i <br /> I15 February 2002 <br /> AGE-NC Project No 98-0500 <br /> r Page 2 of 4 <br /> I dedicated,disposable bailers Temperature,pH and conductivity were measured for stabilization at <br /> regular purge-volume Intervals from each well using an Oakton water analyzer Field data and logs <br /> are in Appendix A Purged ground water was containerized in 55-gallon drums and was stored on- <br /> site, pending proper disposal <br /> I2 2 GROUND WATER SAMPLING <br /> Following well purging, ground water samples were collected from the purged wells utilizing the <br /> dedicated disposable polyethylene bailers and three 40-m1 EPA-approved volatile organic analysis <br /> (VOA)vials containing 0 5 ml 18%hydrochloric acid as a sample preservative and one-liter amber <br /> bottles, lacking preservation Care was taken to ensure that visible air bubbles were not present in <br /> 1 the vials after filling and capping Ground water sample containers were labeled with the well <br /> 1 designation, date, time, and sampler's initials <br /> I23 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> IEach ground water sample was Iogged on a chain-of-custody form,placed in a chilled container and <br /> shipped to McCampbell Analytical,Inc ,(MAI)a California Department ofHealth Services(DHS)- <br /> certified analytical laboratory Selected samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d in <br /> I accordance with EPA Method 8015 Modified and <br /> • Volatile organic compounds and fuel additives by EPA Method 8020/8260 Modified <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 24 January 2002, the contaminant impact to ground water was assessed from the ground water <br /> laboratory data <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> During the January 2002 ground water monitoring event, depths to ground water in the monitoring <br /> Iwells were measured between 47 60 and 48 20 feet below the tops of well casings, ground water <br /> . elevations were calculated to be between 30 91 feet and 3104 feet below mean sea level, in the <br /> Advanced GeoE nviron mental,Inc <br />