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Mr Ron Rowe <br /> hydrocarbons (TPPM and BTEX Samples collected in August and September were also <br /> ' analyzed for MTBE <br /> ' Vapor Sample Analytical Results <br /> Laboratory reports are included in Attachment D and are summarized in Table 4 Based on the <br /> TPPH concentrations, the destruction efficiency of the thermal oxidizer during the July, August, <br /> and September sampling rounds was 92% or better In cases were the destruction efficiency was <br /> less than 95%, APCD's requirement of less than 2 lbs/day discharge was not exceeded <br /> ' Overall, analytical results of Third Quarter 1999 influent samples indicated vapor concentrations <br /> have not declined significantly from the second quarter 1999 MTBE was detected at a very low <br /> ' concentration in the system effluent during August (Influent sample detection limits were too high <br /> to observe similar concentrations) and at an increased concentration in both influent and effluent <br /> in September <br /> ' System Evaluation <br /> The VES has been removing hydrocarbons from subsurface soil since November 19, 1997 at flow <br /> rates ranging from 270 to 380 cubic feet per minute, including dilution air <br /> As of September 30, 1999 the system had been In operation for 10,751 hours Based on graphical <br /> interpolation between measured influent vapor concentrations, as of September 30 an estimated <br /> 12,450 pounds of hydrocarbon contamination had been removed from the soil Table 5 <br /> ' summarizes flow and vapor concentration averages as well as the total hydrocarbon mass <br /> removed from the soil The system is currently removing hydrocarbons from the subsurface at a <br /> rate of approximately 4 pounds per day <br /> ' OTHER ACTIVITIES <br /> On August 16, 1999 76S gallons of drummed purge water was removed from the site by <br /> American Valley Waste Oil A copy of the hazardous waste manifest is included in Attachment <br /> A <br /> rmklgmrL'igm 1999 <br />