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i 25 March 2009 AGE-NC Project No. 95-0121 Page 3 of 9 3 . 1 , PERMITTING AND PRE-FIELD WORK ACTIVITIES Applicable site permits will be obtained from the City of Stockton (sanitary sewer waste discharge, building, electrical, etc.) and from the San Joaquin Valley Air Pollution Control District (SJVAPCD) . In addition, an update to the health and safety plan presently on file with SJCEHD 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 will be obtained through Underground Service Alert, 3 .2. INSTALLATION OF INTERIM REMEDIATION SYSTEM PIPING NETWORK DPE remediation system piping will be installed underground in a 1 .5-foot wide by a 1 .5-foot deep trench; the proposed trenching lay-out is depicted in Figure 4; a cross sectional view of the trench is depicted in Figure 5 . 3 .3 , REMEDIATION SYSTEM ENCLOSURE Installation of a 30-foot wide by 35-foot long concrete pad and chain-link, gated enclosure will be located in southern section of the site currently operated as a road safety equipment sales and rental firm and will surround the DPE remediation system (Figure 4). As required by City of Stockton permitting, a secondary surface water containment barrier will be installed surrounding the DPE system. 3 .4. PROPOSED INTERIM DUAL PHASE REMEDIATION SYSTEM The proposed interim remediation DPE system will consist of a 25-horsepower, oil-ring vacuum blower, with an electric heated catalytic oxidizer to simultaneously extract free-phase petroleum products, ground water and soil-vapor from on-site wells EW- I (screen interval of 20 to 40 feet below surface grade - bsg) and VW- 1 (screen interval of 15 to 30 feet bsg) and AW- 1 (screen interval of 25 to 30 feet bsg). These wells will target remediation on informal hydrogeologic unit 2 andHU3 . Based upon influent hydrocarbon concentrations reported during the December 2007 pilot test and projected BTU values delivered through the vapor stream, catalytic oxidation will be applicable to remediate the vapor stream. The oil-ring blower under standard temperature and pressure is capable of producing a maximum vacuum of 29-inches mercury (Hg) with a nominal capacity of 200 cubic feet per minute (cfin). Advanced GeoEnvironmenml, Inc.