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' Report—Fist Phase Remediai System Page 8 Former Manna Pro Site ' Project No 2013 . June 18,2002 At a point upstream of the air bypass valve, an access port was constructed so that a pitot tube connected to a digital manometer could be inserted to measure the vapor extraction rate Gas sample ports were installed at points before, in-between, and after, the 1,000 ' carbon filters The VES equipment was mounted on a specially constructed steel skid ' 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 110 psig Downstream of the compressor, a pressure regulator was installed to reduce the compressor pressure to levels acceptable for sparging, general ' 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 The air sparge compressor was connected to the wells by 2-inch diameter PVC pipe runs A 0-25 scfm ' range limiting orifice rotameter was used to measure and regulate airflow into the well The sparge equipment was mounted on the same specially constructed steel skid as the VES equipment Construction and assembly of the VES/Sparge surface equipment ' occurred in October and November of 2001 3.2 VES/Sparge System Operations The start-up and operation of the system was delayed b almost three months due to Y Y unexpected delays in obtaining a permit from the San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD) The permit application was submitted on November 19, 2001, but the permit was not issued until February 1, 2002 Insofar as the ' agency required a representative to be on-hand at the time the system was started, the mutually agreed start-up date was scheduled for February 14, 2002 ' 3.2.1 Soil Vapor Extraction System Start Up, Operation & Monitoring The vapor extraction system was started at 0852 on the February 14, 2002 under the ' supervision of a representative of the SJVUAPCD Shortly after the system start-up, an air sample was collected in Tedlar bags from both the influent and effluent sides of the treatment system to satisfy the Air Pollution Control District requirements The concentration of gasoline hydrocarbons in the vapor was measured from the same two points with a PID organic vapor meter The air extraction and air sparge rates were measured, and the vacuum at the casing heads of observation wells OB-4 and OB-5 was measured with a magnahelic gauge The sparge rate was monitored by use of a Rotameter air flow gauge Vapor extraction rates were measured by inserting a pitot tube into the air sampling port up-stream of the Fuji blower The pitot tube was connected to a Dwyer series 475 digital manometer that measures the differential pressure A ' 2937 Veneman Ave , #FB240 Geo-Phase Environmental Inc Phone(209)569-0293 Modesto, CA 95356 Fax (209) 569-0295