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I 3.2 AIR SPARGING PILOT TEST RESULTS The depth-to-water data are presented in Table 3 The applied pressure and air flow rate measurements during the air sparging pilot test are presented in Table 4 The observation well induced pressure measurements are presented in Table 5 The DO and ORP measurements in the ' sparging and observation wells prior to the sparging test are presented in Table 6 Table 7 Presents the DO and ORP measurements during and after the sparging test The distances of the observation wells from the sparging wells and final pressure data are presented in Table 8 ' Groundwater concentrations for well V3 are presented in Table 9 The pilot test was started by injecting air at I pound per square inch (psi) and slowly increasing the injection pressure The injection pressure reached a maximum of 9 psi, then decreased and stabilized at 6 psi The corresponding induced pressure measured at the observation wells ranged from 0 to 0 165 in H2O The air flow rate during the pilot test ranged from 13 2 to 15 5 standard cubic feet per minute (scfm) A rise in ORP was observed in certain monitoring wells during the pilot test DO did not change significantly during the pilot test 3.2.1 Relationship between Air Flow Rate and Pressure I The air flow rate during the air sparging pilot test ranged from 13 2 to 15 5 scfm Applied pressure and air flow rate measurements are presented in Table 4 The air flow rate decreased in response to a decrease in applied pressure A linear relationship between applied pressure and air flow rate was observed over the range tested during the air Sparging pilot test on wells SW 1 and UVB-MW1 (Figure 3) 3.2.2 Effect of Air Sparging on DO and ORP A YSI Model 56 meter was used to measure DO and ORP in observation wells prior to the air sparging test (Table 6) During the air Sparging test on well SWI, DO and ORP were measured in wells V2 and UVB-MW 1 During the air sparging test on well WB-MW 1, DO and ORP were measured in wells V 1 and V2 Both tests showed an increase in ORP in the two observation wells The DO, however, did not change significantly, possibly indicating a high oxygen demand in the soil or groundwater (Table 7) A rise in ORP was also observed in air sparging well UVB-MWI after the sparging test The ORP in this well increased from -31 1 to +1 14 mV Additionally, a nse in DO was observed in UVB-MW1 -- from 0 78 to 2 69 milligrams/liter(mg/1) after the sparging test(Table 7) IWell V3, located 126 5 feet from sparge well SWI, was monitored for DO and ORP after the air sparging pilot test The ORP in this well increased from -37 5 to -18 4 mV There was no significant change in DO in well V3 (Table 7) 3.2.3 Radius of Influence of Air Sparging The radius of influence of air sparging was estimated using the ORP and induced pressure measurements Induced pressure, however, was relatively low, especially compared to the G 1ProJOcts173942VAA5T1.R\WP1A5R09041A5PTR VS doc 4