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1 , <br /> + I r <br /> 28 Apnl 1998 <br /> AGE-NC-95-0103 <br /> ' Page 4 of 9 <br /> J <br /> I <br /> , <br /> 2 4 4 WELL COMPLETION <br /> i s <br /> Boring MW-7 was completed as a ground water monitoring well The well was completed using 2- <br /> inch diameter schedule 40 PVC casing with 0 02-inch slotted screen from approximately 5 to 25 feet <br /> bsj A filter pack was installed using#2 Lonestar sand from 4 to 25 feet Bentonite chips were used <br /> to`make a two-foot plug and the remaining annular space was backfilled to the surface with portland <br /> cement A traffic-rated well box(8-inch diameter)was installed over each well, in accordance with <br /> County regulations As-built monitoring well diagrams are depicted in Appendix C <br /> 1 • f <br /> 2'4 5 MONITORING WELL DEVELOPMENT/PURGING AND SAMPLING <br /> On 02 Apn1 1998, a Solmst,water level meter was used to measure the depth to ground water in the <br /> new well relative to the top of the well casing After ground water depth measurements were <br /> collected the wells was purged using a stainless steel two-stage submersible pump Approximately <br /> ' 20 gallons of water were evacuated from the well Temperature,pH and conductivity were measured <br /> at 5-gallon intervals using an ICM model 52200 water analyzer Stabilization data and field logs are <br /> M included in Appendix A <br /> I r K f <br /> I I 1 II <br /> Upon stabilization,a water sample was collected from the purged well using a new, clean,disposable <br /> plastic bailer Immediately"Upon retrieval the sample was transferred into,chilled a 40-m1 EPA <br /> approved VOA vial containing 0 5 ml concentrated hydrochloric acid as a sample preservative The <br /> sample was placed in a chilled container and transported under chain-of-custody to MAI The sample <br /> I I <br /> was,analyzed for TPH-g, BTE&X and MTBE, TBA, DIPE, ETBE and TAME <br /> 4 kL " ! <br /> 30. FINDINGS ' <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND FLOW DIRECTION r ' <br /> ! Over the first quarter of 1998 ground water elevation increased dramatically The rise of ground <br /> water elevation was approximately 5 feet between December 1997 and March 1998 I The ground <br /> ' water flow direction at the site was mounded from the northern portion of the property'underlying <br /> the parking area of the site'and dipping towards the southwest, to the location of well MW-3 and <br /> MW-5 (Figure 3) <br /> r <br /> I , I <br /> f w r r <br /> I I <br /> ' 32 I ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> ' I <br /> TPH-g 'was detected in the water samples from wells MW 1, MW-3, MW-4 and MW-5 at', r <br /> r + i t I, 't ' , i i 7 • 1 r f <br /> Advanced GeoEavnroam'mal,Inc <br /> ' I <br /> 'F <br />, t Ff XI I t I i n �ru fll I <br /> s <br />