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F Report For Air Monit(ming of EA—led Plot vapor EdractionTest 4445 Pershing Avenue Stockton Calrfornra • On January 3, 1992, concentrations of TPH indicated in the influent air were measured at 28, 31, and 29 parts-per-million by volume (ppmv), and concentrations of TPH indicated in the effluent air were measured at 40, 40, and 40 ppmv The January 7, 1992, measurements indicated influent at 42, 38, and 36 ppmv and effluent at 40, 40, and 40 ppmv The January 14, 1992, measurements on VEW-1, indicated influent at 5,500, 6,000, and 6,500 ppmv and effluent at 40, 40, and 40 ppm The January 21, 1992, measurements indicated influent at 60, 90, and 80 ppmv and effluent at 40, 40, and 40 ppmv Parameters that could possibly affect the effluent readings, thereby indicating inflated values, could be a) increase in air stream temperature, b) sampling apparatus (high temperature could allow for a release of volatiles in plastic tubing), c) instrument calibrations and sensitivity to heat, and d) increase in concentrations of carbon dioxide, carbon monoxide, and water due to the combustion of propane Table 1 summarizes the field monitoring data Radius of influence parameters monitored on January 14, 1992, indicated when the unit induces a vacuum of -68 2 inches of water with a flow rate of 38 6 cubic feet per minute (cfm) solely on VEW-1, MW-4 indicates a vacuum of -0 23 inches of water When the unit induces a vacuum of -66 7 inches of water with a flow rate of 39 6 cfm solely on VEW-2, MW-4 indicates a vacuum of -0 01 inches of water (Figure 2) Vacuum in each well was measured by inserting a magnehelic gauge in the top of the well and taking vacuum • readings (in inches of water) from the gauge i 89-016J RPT 3