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1 <br /> infection pressure The induced pressure also varied with time and was not consistent in all <br /> directions Hence, induced pressure could not be used effectively to estimate the radius of <br /> influence of air sparging <br /> During the air sparging test on well SWI, ORP was measured in wells V2 and WB-MW 1 ORP <br /> in well V2, located 28 5 feet from SWI, increased from -15 6 to -9 6 mV during this test (Table <br /> 7) ORP in well UVB-MWI, located 62 5 feet from well SW1, increased from -31 1 to -25 0 mV <br /> during this test (Table 7) Thus, air sparging influence was observed at a distance of 62 5 feet for <br />' well SWI During the air sparging of well SW1, 13 wells were monitored for induced pressure <br /> (Table 5) Induced pressure was observed in II wells The highest induced pressure of <br /> 0 35 in H2O was observed in well V2 Induced pressure of 0 01 in H2O was observed in well <br />' MW I, which is located 112 5 feet from SWI It is, however, difficult to assume that this induced <br /> pressure resulted from the air sparging of well SWI <br />' During the air sparging on well UVB-MW1, ORP was measured in wells V1 and V2 ORP in <br /> well V1, located 38 5 feet from well UVB-MW1, increased from -28 8 to -14 1 mV during this <br /> test (Table 7) ORP in well V2, located 43 5 feet from UVB-MW 1, increased from -15 6 to <br />' -10 5 mV during this test (Table 7) Thus, influence of air sparging was observed at a distance of <br /> 43 5 feet for well UVB-MW 1 During the air sparging of well UVB-MW I, 12 wells were <br /> monitored for induced pressure (Table 5) Induced pressure was observed only in two wells This <br />' could be due to short-circuiting through the nearby UVB well (less than 5 feet from the infection <br /> well) and well UVB-MW2 The highest induced pressure (0 03 in H2O) was observed in well <br /> SWI, located 62 5 feet from UVB-MW1 <br /> 3.2.4 Groundwater Concentrations <br /> At the request of the SJCEHD, groundwater samples were collected from well V3 before and <br /> after the air sparging pilot test The samples were analyzed in the laboratory for BTEX, MTBE, <br /> and TPH-g The laboratory analytical results are summarized in Table 9 Concentrations of <br /> TPH-g were 28,400 µg/L before the test and 39,000 µg/L after the test MTBE was not detected <br /> when the groundwater samples were analyzed by Method 8260B <br /> r <br /> i <br /> • <br /> G 1P-JCC k739421MMTERIWPIA5R09041A5PM V5 doc 5 <br />