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i E18 September 1998 • AGE-NC Project No 96-0254 EPage 4 of 8 E Monitoring wells MW-3 (Boring B11), MW-5 (Boring B13) and MW-6 (Boring B12) were completed with 0 02-inch slotted screen from depths of 5 to 15 feet bsg A filter pack was installed using #3 Lonestar sand from 3 to 15 feet Bentonite chips were used to make a 2- foot plug above the sand filter packs The remaining annular space was backfilled to the surface with portland cement A traffic-rated well box(8-Inch diameter) was Installed over each well, in accordance with County regulations I As-built monitoring well diagrams for each monitoring well are Included as Appendix B I 2 5 MONITORING WELL SURVEY E The casing elevations of each well Installed for the Curtiss-Pontiac UST investigation were surveyed g y relative to MW-I located at 2420 Grant Line Road (Grant Line Gas and Food) Well MW-1 at 2420 EGrant Line Road was previously surveyed with a relative elevation of 20 feet above mean sea level Combining the two sites in a survey will allow the use of wells from 2420 Grant Line Road site to lie be used in the calculation of the gradient and ground water flow direction for the Curtiss-Pontiac site E2 6 GROUND WATER DEPTH MEASUREMENT AND PURGING On 27 February 1998, a Sollnst water level meter was used to measure the depth to ground water in E each well relative to the top of the well casings After ground water depth measurements were collected, each monitoring well was purged using a two-stage submersible pump Approximately 10 gallons of water(a minimum of 3 well volumes per well)were evacuated from MW-1 A, MW-2A, E MW-3, MW-5 and MW-6, approximately 15 gallons of water were purged from MW-1 B and MW- 2B ETemperature,pH and conductivity of were measured at 2-gallon intervals in wells MW-1 A,MW-2A, MW-3, MW-5 and MW-6, and at 3-gallon intervals In wells MW-1B and MW-2B Ground water E parameters were collected using an lCM model 52200 water analyzer Field logs of the measurements are included in Appendix C Purged water was temporarily stored on-site in 55-gallon drums E 27 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES EWater samples were collected from each monitoring well using a disposable bailers The samples • were transferred into 40-m1 EPA-approved vials containing 0 5 ml of hydrochloric acid (18%) as a Advanced GeoEnvi ron mental Inc E