ARCHIVED REPORTS XR0009884 - Laserfiche WebLink

Home Browse Search

1 Report—Remedial Action Feasibility Page 7 Cutter Lumber—Western Lift Site GPE Project No 1023 • August 1,2003 ' 3.0 SURFACE EQUIPMENT & SYSTEM OPERATION 3.1 System Installation The surface equipment for the pilot system was installed after the new service wells were constructed A skid-mounted unit equipped with a piston air compressor and a nng compressor was temporarily mobilized to the location for the duration of the pilot test The surface equipment was connected to the vapor extraction well and sparge well by installing temporary aboveground PVC pipe runs The pipe run for the sparge well was constructed with 1 5-inch diameter schedule 40 PVC pipe and 3-inch PVC pipe was used for the vapor extraction well Assembly of the VES/Sparge surface equipment occurred in May and June of 2003 The electrical service available at the equipment site proved Inadequate to operate the equipment needed for the system Consequently, Valley Utilities, a licensed electrical ' contractor, was contracted to construct a suitable electrical service The service consists of a 240, volt, 30-amp, 3-phase electrical system equipped with a 120-volt local outlet It is expected that this service will be up-graded for use in the final remedial system 3.1.1 Vapor Extraction System Installation . The vapor extraction system consisted of a Fuji 7-horsepower regenerative blower (ring compressor) 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 150 scfm For the purposes of this short-term test is was deemed unnecessary to Install a free water knock-out chamber up-stream of the blower The blower exhaust was directed through a 1,000-pound activated carbon filter to extract gasoline hydrocarbons ' prior to discharging the exhaust vapor to the atmosphere At a point upstream of the air bypass valve, an access port allowed Insertion of a phot tube connected to a digital manometer to measure the vapor extraction rate Gas sample ports were installed at points before, and behind, the 1,000-pound carbon filter 3.1.2 Air Sparge Pump Installation The air sparge equipment consisted of a 5 horsepower, 2-cylinder, Ingersoll-Rand air compressor equipped with a 60-gallon pressure tank The compressor is designed to operate at about 140 psig Downstream of the compressor, a pressure regulator was installed to reduce the compressor pressure to levels acceptable for sparging, generally ' between 15 to 20 psig The compressor was capable of producing over 10 scfm of airflow at the face of the screened interval at the bottom of the well, but was set to deliver less A 0-25 scfm range limiting orifice rotameter measured airflow into the sparge well • ' 2937 Veneman Ave , #13240 Geo-Phase Environmental Inc Phone(209)569-0293 Modesto, CA 95356 Fax(209) 569-0295 1