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u �.J i 26 April 2011 AGE-NC Project No. 03-1100 Page 3 of 6 through OW4 and OW8 through OW10, from 12 to 14 feet bsg in borings OW5 and OW6, and from 12.5 to 14.5 feet bsg in boring OW7. The wells were installed by placing the well casing through the hollow stem of the augers to the total depth of the boring. The augers were incrementally raised as#2/16 sand (filter pack) was slowly poured down the annulus between the well casing and the inner wall of the hollow stem auger. The filter packs were placed adjacent to the sparge points from the bottom of the boring to a point approximately 1.5 and 2 feet above the top of the sparge points. A 3.5-foot or 4-foot bentonite seal was installed above the filter packs utilizing medium- sized bentonite chips. Once the chips were in place, they were allowed to hydrate a minimum of one half hour prior to grouting. Following hydration of the bentonite, the wells were grouted to near surface with portland type II cement (grout seal), and a water-tight, traffic-rated well box was installed over the wells. 2.4. NON-HAZARDOUS WASTE DISPOSAL On 25 February 2011, Slaby Environmental Inc. of Stockton, California, transported and disposed of ten 55-gallon drums of soil cuttings generated during ozone well installations. Drums were properly disposed of at Western Environmental of Mecca, California. On 04 March 2011, Instrat Inc. of Rio Vista, California transported and disposed of 3 purge water drums generated during ozone well installations and periodic ground water monitoring events. Transported water was treated and disposed of at Instrat's facilities. Non- hazardous waste manifests documenting the disposal of soil and water are included in Appendix E. 3.0. WELL SAMPLING PROCEDURES On 30 March 2011, a limited ground water monitoring event was performed at the site. Depth to ground waterwas measured and ground water samples were collected from wells OW3, OW4, OW6 and OW7. Ground water monitoring and sampling was performed in accordance with AGE's standard monitoring and sampling procedures, provided in Appendix F. Advanced GeoEnvironmental,Inc.