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Marty Harzel • • EAI Project No. 1232 <br /> September 17, 2001 <br /> Page 2 <br /> toluene, ethylbenzene and xylenes (BTEX) and methyl tertiary butyl ether (MTBE) by EPA <br /> Method 8021. No MTBE confirmation analysis by EPA Method 8260B was completed. The <br /> ground water samples collected from wells MW-2 and MW-3 had a gasoline odor. <br /> The results of the testing are compiled in Table 1. The chain of custody record and laboratory <br /> report are attached. No detectable concentrations of chemicals were encountered in the sample <br /> collected from well MW4. Well MW-4 is located next to air sparging well VEW-8. It is <br /> probable that sparging air was bubbling through well MW-4 stripping out all dissolved <br /> hydrocarbons. The analytical data for the ground water samples collected from wells MW-2 <br /> and MW-4, exhibited a reduction in the concentrations of dissolved components. <br /> Field VOC Reading <br /> After restarting the air sparging compressor, volatile organic compound (VOC) reading were <br /> taken from vapor extraction wells using a PID instrument. All readings were insignificant, i.e., <br /> at or just slightly above the background level. <br /> Soil Vapor Testing <br /> The thermal oxidizer was started to obtain soil vapor data. Immediately after the start-up, the <br /> VOC reading from the inlet of the oxidizer, using a PID, was in the range of 300 ppmv which <br /> dropped to 145 ppmv in approximately five minutes. The soil vapor and combustion gases <br /> samples were then collected in Tedlar bags. These samples were analyzed for TPH, BTEX and <br /> MTBE (see Table 2). The chain of custody record and laboratory report are attached. <br /> The oxidizer was left running for several days and was shut-down on August 30, 2001. <br /> Between June 22, 2001 and August 27, 2001, the oxidizer was in operation for approximately <br /> 197 hours resulting in removal of approximately 47 pounds of hydrocarbons. The sparging <br /> compressor was in operation for approximately 665 hours. <br /> Current Status <br /> The thermal oxidizer is shut-down, and the sparging compressor is running in a "pulse" mode, <br /> i.e., three days online and four days offline. <br /> Please call me at (714) 632-8521, ext. 240 or Steven Bright at ext. 224 if you have any <br /> questions. <br /> Distribution List <br /> Mike Infurna <br /> San Joaquin PHS-EHD <br /> 304 East Weber Street <br /> Stockton, CA 95201 <br /> B5:1232:MEMO-RWQM <br />