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06 October 2006 AGE-NC Project No. 04-1207 Page 5 of 9 3.1. PERMITTING AND PRE-FIELD WORK ACTIVITIES Applicable site permits will be obtained from the San Joaquin Valley Air Pollution Control District (SJVAPDC). In addition, an update to the site health and safety plan presently on-file will be prepared in accordance with Occupational Safety and Health Guidance Manual for Hazardous Waste Site Activities (National Institute for Occupational Safety and Health Administration, U.S. Coast Guard and U.S. Environmental Protection Agency, 1985). Prior to mobilization, all underground trenching areas will be clearly marked and a utility clearance obtained through Underground Service Alert. 3.2. SOIL VAPOR EXTRACTION SYSTEM Two-inch diameter, schedule 40 polyvinylchloride (PVC) piping will be installed approximately 6 inches below the surface of the site and routed in a temporary trench from the SVE well head (VW-1) to the vapor extraction unit. The trench will be backfilled with native fill material and covered with cement grout. The proposed SVE piping system is illustrated on Figure 2. 3.2.1. Proposed Soil Vapor Extraction System Design Granular activated carbon(GAC;vapor phase)is proposed for the recovered hydrocarbon vapor by utilizing a regenerative blower-based soil vapor extraction system. The SVE unit used will be portable (trailer-mounted) due to the limited duration of use proposed and low concentrations of hydrocarbon vapor detected during the SVE pilot test in July 2006. Specifications of the system are illustrated on Figure 3. The SVE piping system will connect the SVE well (VW-1)to a blower and GAC-based SVE unit via a manifold box. The system is proposed to be located adjacent to well VW-1 in the central portion of the site to reduce noise intrusion into neighboring residences. Additionally, in order to minimize disturbance to residents,AGE proposes operation of the system only during daytime hours (approximately 8:00 AM to 5:00 PM,Monday through Friday).A typical destruction rate of greater than 95% of hydrocarbon vapors is expected throughout the entire cleanup duration. 3.3. GROUND WATER EXTRACTION SYSTEM Based on the fuel component-impact encountered in Thater Property ground water monitoring wells and grab water samples collected during the aquifer pumping test,well MW-I appears to be located in the area of highest known ground water contamination at the site. Therefore, AGE proposes to Advanced GeoEnvironmental,Inc.