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1 ' 3. AIR SPARGING PILOT TEST On 8 September 2004, ETIC initiated an air sparging pilot test using an oil-less air compressor The air sparging pilot test was conducted to gather preliminary information needed to assess the feasibility of injecting ozone and hydrogen peroxide as an insitu oxidation technology for site ' remediation Specifically, the purposes of the air sparging test were • to assess the relationship between air flow rate and pressure ' • to assess the effect of air sparging on DO and ORP ' • to estimate the radius of influence of air sparging The air sparging pilot test was conducted on two existing wells, S W 1 and WB-MW 1 Well ' SW1 is screened between 40 and 45 feet bgs and WB-MW1 is screened between 35 and 40 feet bgs Section 3 1 describes the pilot test procedures, and the results of the test are presented in Section 3 2 A copy of the field notes is presented in Appendix B The groundwater analytical ' report for samples from well V3 is presented in Appendix C 3.1 AIR SPARGING PILOT TEST FIELD PROCEDURES ' The air sparging pilot test was conducted using an oil-less air compressor capable of 100 pounds per square inch (psi) pressure and 12 cubic feet per minute (cf n) flow rate A 2-inch-diameter galvanized iron pipe was used to connect the compressor to the sparging wells During the pilot test, wells SWI and UVB-MW 1 were used for air sparging and up to 13 observation wells were monitored for induced pressure The test wells and observation wells used during the test are listed in Table 1 Table 2 presents the well construction details Depths to water in wells were measured with an electronic water level gauge prior to the pilot test to determine the depth to water relative to the well screen Compressed air was injected into both sparging wells for approximately 1 hour Injection pressure, induced pressure, air flow rate, compressed air temperature, DO, and ORP were monitored during the air sparging pilot test Conductivity, pH, and temperature of groundwater were also recorded during the test Magnehelic pressure gauges and a digital pressure gauge were used to measure induced pressure at the observation wells approximately every 20 minutes for approximately 1 hour A TSI model air flow meter was used to measure air flow rates A YSI Model 56 meter was used to measure DO, ORP, water temperature, pH, and conductivity At the request of the SJCEHD, groundwater samples were collected from well V3 before and after the pilot test and were analyzed in the Iaboratory for BTEX, MTBE, and TPH-g During the air sparging pilot test, sparging of well UVB-MWI was stopped for about 5 minutes due to a mechanical problem with the air compressor Sparging of well UVB-MW I was resumed Iafter the mechanical problem was resolved G 1Projccts5739421MASTER\WPIASR0904\ASPTR V5 doc 3