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•fFkmL s Pmport for Nr Mondoring of <br /> E dendee)Pk t Vapor Exaction Test <br /> 4445 Pershing Avenue 5tockton,California <br /> rOn December 5, 1991, concentrations of TPH indicated in the influent air were measured <br /> at 89, 78, and 77 parts-per-million by volume (ppmv), and concentrations of TPH indicated <br /> in the effluent air were measured at 15, 13, and 11 ppmv The December 11, 1991, <br /> measurements indicated influent at 330, 310, and 330 ppmv and effluent at 14, 18, and <br /> 18 ppmv The December 13, 1991, measurements indicated influent at 280, 300, and <br /> 260 ppmv and effluent at 17, 17, and 14 ppmv Table 1 summarizes the field monitoring <br /> data <br /> Radius of influence parameters monitored on December 3, 1991, indicated when the unit <br /> induces a vacuum of -58" of water with a flow rate of 45 5 cubic feet per minute (cfm) <br /> solely on VEW-1, MW-1 shows no influence, MW-2 indicates a vacuum of -0 04 inch of <br /> water and MW-3 indicates a vacuum of -0 20 inch of water When the unit induces a <br /> vacuum of -2 1 inches of water with a flow rate of 69 1 cfm solely on VEW-2, MW-1, MW-2 <br /> and MW-3 show no influence (Figure 2) Vacuum in each well was measured by inserting <br /> a magnehelic gauge in the top of the well and taking vacuum readings (in inches of water) <br /> from the gauge <br /> 89-016H RRr 3 <br />