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Harding Lawson Associates MONITORING SCHEDULE / EQUIPMENT The vapor extraction system (VES) will be monitored #6a according to the guidelines specified by the San Joaquin Valley Unified Air Pollution Control District (APCD) . A proposed schedule would entail monitoring the VES daily for the first five �. days of operation and weekly thereafter. After operation of the VES has progressed for some time, the monitoring schedule can be adjusted to a monthly monitoring schedule if it can be shown that the first carbon reactor will not "breakthrough" in treatment efficiency. we proposed to monitor hydrocarbon concentrations throughout the VES process with a portable gas chromatograph that utilizes a Flame Ionization Detector (FID) for measuring the total hydrocarbon content of the air stream. Additional sampling can *� be performed on start-up and quarterly thereafter, using Tedlar bags or activated charcoal tubes to be analyzed in the laboratory by EPA Test Method 8015 for Total Petroleum Hydrocarbons (TPH) and by EPA Test Method 8020 for concentrations of benzene, toluene, ethylbenzene, and xylenes (BTEX) . Monitoring will be conducted from three sampling ports in the process flow (Refer Plate 4) . Sampling point "VES" represents the untreated air stream from the exhaust of the blower prior to entering the first carbon reactor. Sampling point "R-1" represents the exhaust of the first carbon reactor prior to entering the second reactor. Sampling point "R-2" represents the exhaust of the second carbon reactor and the exhaust to the atmosphere from the total system. Airflow measurements will be acquired from the blower exhaust (VES) and from the second reactor (R-2) using a hand-held anemometer. This anemometer measures the flow velocity in feet per second and has a range of 0 to 600 ft/sec. Applied vacuum from the intake of the blower is measured by an in-line vacuum gauge mounted on the PVC manifold. *moll 032909P/R53