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j Al { Ms.Jan Sudomier, SJVAPCD JOctober 8 2003 } Source Test Termination t Project No.,2007-0065-01 E� Page'2 j. effluent flow rates, applied vacuum to each well, and photo-ionization detector (PID) { measurements for air samples!were recorded on field data sheets (Appendix B). Based on the analytical results of air samples collected on August 1 2003, the SVE system operated effectively l in removing volatile organic cozrpounds (VOCs) at a_ destruction efficiency of approximately 99.97 percent. Table 1 presents a summary of the analytical results and destruction efficiencies. Detailed calculations for estimated mass,emission rates and destruction efficiencies are presented in Appendix C. ' Subsequent to system start up, a Stratus technician visited the site on a weekly basis, in accordance with the ATC requirements, to verify system compliance for petroleum hydrocarbon emission using PID measurements.for influent and effluent gas streams. i ' On August 18, 2003, the PID measurements for the midfluent and effluent air samples indicated VOC concentrations!of 39 parts per million (ppm) and 18 ppm, respectively (Appendix B). An effluent Lair sample was collected in a one-liter tedlar bag, and forwarded to Alpha to verify the PID data. The SVE system was then shut down pending receipt of the analytical results of this effluent sample.. `` The analytical results of the effluent air sample collected on August 18, 2003, reported a TPHG concentration of 100 ;milligrams per cubic meter (mg/m) indicating a break- through of petroleum hydrocarbons through the carbon units. The SVE source test was i terminated and the system continued to remain shutdown pending evaluation for early break-through in the carbon units. Based'on carbon usage estimates supplied by.the vendor, this early carbon breakthrough was not anticipated. However,' in subsequent discussions with the;'vendor, it was learned that granular re-activated carbon was delivered at the site instead of virgin coconut shell carbon. The carbon usage estimates for re-activated carbon are relatively low compared +1 to the virgin coconut shell carbon, and hence an early break-through was observed at the - 1 3' site. ' i3 Stratus proposes to replace the existing regenerated carbon with virgin coconut shell carbon, and repeat the source,;test in accordance with the requirements identified in the SJVAPCD ATC dated on April 22, 2003. a . r Pi . PAUSA Gasoline100651Correspondence\Source Test Termination letter\USA 65 Source Test Termination letter.doc r- A ;