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SECOR <br /> • TABLE OFCONTENTS <br /> 1.0 SITE BACKGROUND........................................................................................................1 <br /> 2.0 FIRST QUARTER 2006 COMPLETE WORK SUMMARY ..............................................3 <br /> 2.1 STTC 3 <br /> 2.2 Additional Work Performed on 5TTC Sites................................................................3 <br /> 3.0 FIRST QUARTER 2006 GROUNDWATER MONITORING AND SAMPLING RESULTS..4 <br /> 4.0 "A" ZONE .........................................................................................................................5 <br /> 4.1 "A" Zone Groundwater Gradient..................................................................................5 <br /> 4.2 "A" Zone Groundwater Quality Data............................................................................5 <br /> 4.3 "A" Zone SPH and Hydrocarbon Concentration Trends...............................................6 <br /> 5.0 "B" ZONE .........................................................................................................................9 <br /> 5.1 „B„ Zone Groundwater Gradient. ................................................................................9 <br /> 5.2 "B" Zone Groundwater Quality D ta............................................................................9 <br /> 5.3 "B" Zone SPH and Hydrocarbon Concentration Trends............................................. 10 <br /> 6.0 "C" ZONE ........................................ ..............................................................................11 <br /> 6.1 .,C„ Zone Groundwater Gradient. .............................................................................. 11 <br /> 6.2 "C" Zone Groundwater Quality Data.......................................................................... 11 <br /> 6.3 "C" Zone SPH and Hydrocarbon Concentration Trends ............................................ 12 <br /> 7.0 "D» ZONE .......................................................................................................................14 <br /> 7.1 "D" Zone Groundwater Gradient................................................................................ 14 <br /> 7.2 .,D,. Zone Groundwater Quality Data.......................................................................... 14 <br /> • 7.3 "D" Zone SPH and Hydrocarbon Concentration Trends ............................................ 15 <br /> 8.0 VERTICAL GRADIENTS.................................................................................................16 <br /> 8.1 "A" to .,B., Zone Vertical Gradients............................................................................. 16 <br /> 8.2 „B„ to „C" Zone Vertical Gradients............................................................................. 16 <br /> 8.3 „C„ to .,D., Zone Vertical Gradients............................................................................. 16 <br /> 9.0 OZONE SPARGE SYSTEM OPERATIONAL DATA.......................................................17 <br /> 9.1 Ozone Sparge (OS) System Configurations.............................................................. 17 <br /> 9.2 Summary of the Performance of the OS Systems..................................................... 17 <br /> 9.3 Ozone Injection Monitoring Prog{am......................................................................... 17 <br /> 9.4 Evaluation of Groundwater Concentration Trends..................................................... 19 <br /> 10.0 PURGE WATER DISPOSAL...........................................................................................21 <br /> 11.0 SECOND QUARTER 2006 PLANNED ACTIVITIES........................................................22 <br /> 11.1 Planned Activities at STTC......................................................................................22 <br /> 11.2 Additional Activities Planned at BP, Tesoro, and Time Oil Facilities........................22 <br /> 12.0 CONCLUSIONS AND RECOMMENDATIONS................................................................23 <br /> 13.0 LIMITATIONS..................................................................................................................24 <br /> • <br /> STTC IQ06 Final Report I May 1,2006 <br /> 770T.43673.12.0002 <br />