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19 July 2000 AGE-NC Project No 96-0232 Page I 1 of 29 of the next filter pack The second filter pack was added at the base of the next screen interval to approximately two feet above the screen After installation of the filter pack, bentonite pellets were placed above the filter pack to the next screen interval This process was continued to approximately 3 feet above the last screen interval, the remaining annular space was filled to the ground surface with a cement grout The grout mixture consisted of Type 1/11 portland neat cement with not more than 6 gallons of water per 94-pound sack of cement The grout was placed by pumping through tremmie pipe or pouring through the center of the hollow stem augers Multi-level monitoring wells MW-8 through MW-13 were all completed utilizing the same construction procedures tailored for each individual designed well 5 3 DEVELOP MULTI-LEVEL MONITORING WELLS On 09 May 2000, AGE personnel developed multi-level monitoring wells MW-8 and MW-9 On 11 May 2000,AGE personnel developed multi-level monitoring wells MW-10,MW-11,MW-12, and MW-13 • 5 3 1 Field Procedures Development of monitoring wells MW-8 through MW-13 was performed by purging three times the well casing volume of ground water for each individual well Purge water was extracted by lowering and raising a 3l8-inch outer diameter, length-discrete polyethylene hose equipped with a ball-valve water tip through the top chamber into the water-charged screen section All purge water was containerized in properly labeled DOT-approved 55-gallon drums, and stored on-site in an area lacking public access 5 4 INITIAL MULTI-LEVEL WELL MONITORING AND SAMPLING On 15 May 2000, AGE collected depth to ground water measurements from MW-8 through MW-13 Depth to ground water and ground water elevation data is presented in Table 5 Advanced GeoEmlronnl[ntal Inc