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Air Sparging Pilot Test Related Activities Report and Remedial Action Work Plan <br />Former Countryside Market, Stockton, California April 30, 2015 <br />6.7.1 Vapor Stream Sampling <br />In addition to the routine O&M activities outlined above, vapor stream samples may be collected <br />and analyzed to evaluate system performance and comply with SJV-APCD permit requirements. <br />As described above, total VOCs will be measured during O&M site visits. In general, a PID will be <br />used for these measurements. To confirm these field measurements, vapor stream samples from <br />the system influent and individual SVE wells may be collected in TedlarTm bags. The samples will <br />be transported under COG to a California-certified hazardous materials testing laboratory and <br />analyzed for VOCs using EPA Method TO-15 or equivalent (gas chromatograph/mass <br />spectrometer, or GC/MS, for VOCs). Field PID readings will also be compared to laboratory <br />analytical results to develop a correlation between field and laboratory data. <br />6.7.2 Water Handling <br />Water produced from the knock-out tank will be containerized and profiled for off-site disposal. <br />6.7.3 Carbon Changeout <br />PID readings and vapor concentrations from the series of carbon vessels will be used to evaluate <br />carbon loading and compliance with SJV-APCD permit requirements. When needed, the GAC in <br />vessel(s) will be replaced and transported off-Site for regeneration. <br />6-6 The Source Group, Inc.