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Report-P,lot Remedial S}stem Test Page 5 <br /> Former Manna Pro Site <br /> Project No 207 3 <br /> . July 31,2000 <br /> • In order to test the effectiveness of ORC in containing the lateral spread of <br /> hydrocarbons resulting from the operation of the remedial system, a soil boring was <br /> drilled down gradient of the vapor extraction well The saturated interval in the <br /> bonng (25 to 50 feet below ground surface) was backfilled with 300 pounds of ORC <br /> compound The effectiveness of the ORC was measured by collecting groundwater <br />' samples from down-gradient well, MW-6 and measuring the dissolved oxygen <br /> content from this well <br /> s Upon completion of the required bonngs and wells, the pilot air sparge / vapor <br /> extraction system was installed Vapors were extracted and destroyed using an <br /> internal combustion engine (ICE) <br /> • After the vapor extraction system had been in operation for approximately 24 hours, <br /> the air sparge system was activated A 1 5 horsepower compressor was connected to <br /> the sparge well used to infect air into it The air flow was metered and controlled <br /> • During the pilot test, samples of vapor extraction effluent gas were collected, and <br /> certain physical parameters including depth to groundwater, oxygen levels, air flow <br /> and vacuum were measured in the nearby observation wells and from the vapor <br />' extraction and air sparge wells <br /> • Although not a part of the pilot test, this scope of work also included completion of a <br /> water production well survey This was to determine if any water wells exist within <br /> 2,000 feet of the point of release <br /> 1 <br /> r <br /> r <br /> r <br /> r <br /> 2937 Veneman Ave , #!13240 Geo-Phase Environmental Inc Phone(209)569-0293 <br /> Modesto,CA 95356 Fax(209)569-0295 <br /> r <br />