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' Report—Fist Phase Remedial System Page 7 Y Former Manna Pro Site ' Project No 207 3 June 18,2002 ' 3.0 SURFACE EQUIPMENT & SYSTEM OPERATION ' 3.1 System Installation The equipment for the pilot system was installed after the new air sparge well was ' constructed An area adjacent to an existing shed was designated as the location for the surface equipment (see Figure 2) The surface equipment was connected to the vapor extraction well and two sparge wells by installing underground pipe runs to connect to the wells with surface equipment Prior to installing the service equipment the following preparatory tasks were completed Pipe Runs &Well Box Preparation The asphalt pavement was saw-cut in preparation for laying pipe runs and setting special well boxes The cut pavement was removed, as were the original well boxes Well boxes ' specially modified to accommodate service pipes were installed over each of the three service wells A trenching machine was used to cut 4-inch wide trenches about 18 inches deep A 3-inch diameter run of PVC pipe was laid in the trench and connected to the ' VES well and the vapor extraction system (see Figures 3 and 5) Two-inch diameter pipe runs were laid and connected to the two air sparge wells and the air compressor system After the pipe runs were laid, the trenches were back-filled with imported road mix and compacted An asphalt contractor patched the pavement over the trenches For the most part, this work was completed during August 2001 Electrical Service The electrical service available at the equipment site was inadequate to operate the equipment intended for the remedial system Consequently, Valley Utilities, a licensed electrical contractor, was contracted to construct a suitable electrical service The service consists of a 240, volt, 90-amp, 3-phase electrical system equipped with a 120-volt local outlet and a watt-hour meter to gauge electrical use 3.1.1 Vapor Extraction System Installation The vapor extraction system consists of a Fuji 7-horsepower regenerative blower capable of pumping about 215 scfm under a vacuum of 30 inches of water The system was equipped with a by-pass ball valve to regulate the extraction rate to less than 175 scfm Up-stream of the blower, a free-water-knock-out chamber was install to prevent formation water vapor from entering the system and a cartridge filter was installed to remove any particulates from entering the blower The blower exhaust was directed through two 1,000-pound carbon filters connected in series to extract gasoline hydrocarbons prior to discharging the exhaust vapor to the atmosphere 2937 Veneman Ave,##13240 Geo-Phase Environmental Inc Phone(209) 569-0293 Modesto,CA 95356 Fax(209)569-0295