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15 January 2007 AGE-NC Project No. 99-0669 Page 6 of 10 3.0. FIELD PROCEDURES All field procedures will be overseen by an AGE representative under the supervision of California Professional Geologist. Procedures for well installation, well completion, well development, soil sampling and ground water sampling are included below. 3.1. WELL DRILLING AND SAMPLING The proposed ground water monitoring wells(MW-12 through MW-24)will be advanced utilizing a truck-mounted or LAR, hollow stem drill rig equipped with 8.25-inch diameter hollow-stem augers. Cuttings and rinseate generated during drilling will be containerized in properly labeled Department of Transportation(DOT)-approved model 17H 55-gallon drums, and stored on-site in an area lacking public access. Disposal alternatives will be evaluated based on results of soil and water analysis. Soil samples will be collected at five-foot intervals from the wells installed within HU4,beginning at a depth of 5 feet bsg,utilizing a California split-spoon sampler and brass sleeves.The sampler will be driven by dropping a 140-pound weight from a height of 30 inches (blow counts). The blow counts will be recorded on boring logs. Upon soil sample retrieval, a selected brass sleeve will be removed from the sampler. The ends of the brass sleeve will be immediately covered with Teflon sheets,sealed with plastic end caps,secured with tape and immediately placed in a chilled container for transportation to a DHS-certified laboratory. Each sample sleeve will be labeled with boring location, depth,time, date and sampler's initials. Sample duplicates will be monitored for the presence of organic vapor using a photo-ionization detector (PID: Thermo Environmental 580, 10.0 eV, calibrated to isobutylene) and described on boring logs using the Unified Soil Classification System (USCS). All sampling tools and brass sleeves used for sample collection will be thoroughly rinsed with clean water after washing with a solution ofAlconox.All hollow stem augers will be steam-cleaned prior to advancement in each borehole. 3.1.1. Well Completion Following drilling for each of the proposed single-completion well pilot borings, 2-inch diameter schedule 40 PVC 0.020-inch perforated well screen and blank well casing will be installed at each location. A 10-foot section of well screen will be installed between 40 feet and 50 feet in wells installed within HU2;a 10-foot section of well screen will be installed between 70 feet and 80 feet Advance!GmEnvirenmental,Inc.