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The depth of the sparging point is 55 feet bgs and the present water table is 33 feet bgs, therefore, the depth of the sparging point is 22 feet The breakout pressure is the depth times the pressure of water, which is 0 43 PSI The breakout pressure is 22 X 0 43 = 9 46 PSI The maximum pressure will be regulated to 15 PSI, which is necessary to protect the PVC pipe as explained in the Work Plan The ratio of the breakout pressure to the actual pressure will be 1519 6 = 1 56 Using the graph we find that the Horizontal Radius vs Sparging Depth is approximately 2 5' Therefore, the Radius of Influence for the sparging systerrt will be 2 5X 22 Feet = 55 Feet The plot of this radius is shown in Figure 2 —��r-cry-cJ�� t E L. d A �-4 a �� `�V, The Radius of Influence of the vapor extraction wells are also shown in Figure 2 As you will note the Radius of Sparging is surrounded by the Radius of Influence of the vapor extraction wells The capture zone will be completed with the installation of vapor extraction well VW-7 Well VW-7 was mistakenly called VW-6 in the original work plan 4 The plot of the piping runs for the Vapor Extraction System (VES) is included in Figure 9 The air sparging well is marked AS and the position of vapor well VW-7 is shown along with the pipe connecting this well to the VES We have included Table 5, which is the air testing by laboratones in the past We are not including the weekly readings, since they are included in our Quarterly Reports 5 The Air Sparging System will be monitored prior to its start up and after its been in operation for two (2) days You have recommended that we check the system every 2 weeks also, while it is operating This will be done The incoming air from extraction wells will be measured individually to assure us that they are capturing the sparging air The concentration in each well should rise as the sparging starts The readings well be performed with our OVA meter connected to the fittings as described in Section 1 We will check the actual input and output of the VES prior to stating the system and every two weeks after the sparging system is operating Oxygenates along with BTEX and TPH will be tested through the laboratory samples only We invasion doing this the second week and then once toward the end of the sparging The depth of water in wells BM-1, BM-2, BM-3, BM-4, BM-5 and BM-8 will be measured as we do in the quarterly reports The water table is expected to rise due to the sparging air The radius of the rise is important to know since this will be the Radius of Influence of the sparging well We expect to see a rise in the water table in wells BM-1 and BM-5 and no rise in any of the other wells In each of the wells mentioned, we will also measure the dissolved oxygen concentration This will be done the same way we do it during the Quarterly Monitoring We expect to see a rise in the dissolved oxygen in the wells within the Radius of Influence BM-1 and BM-5 and in the down gradient well BM-8 in about 3 years However, we do not believe the sparging will continue for 3 years The readings, taken during this monitoring, will be included in each Quarterly Report 6 The Conde Pump we will use is Number 6, 3 Horsepower at 1200 RPM as outlined in Section 1 and in the September 23, 1998 Work Plan Addendum The Conde Pump will be connected to the air sparging line already installed It will be connected electrically to the vapor extractor in such a way so that the Conde Pump will shut off if the Thermal Oxidizer shuts down 7 We have provided 4 cross-sections of this site They are shown in Figures 4 through 8