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Page 3 of 4 <br /> N <br /> 4.4.2 AirSoarging Test <br /> To evaluate air sparging as a groundwater remediation alternative, a 4-hour air sparging teat will <br /> be conducted on the air sparge well(AS-1), The air sparge test will be used to evaluate: <br /> • The air injection pressure and flow rate for engineering design requirements; <br /> • Radius of influence; <br /> + Any Increase in dissolved oxygen readings in the test well anal ubseivation wells; <br /> • Off-gassing volatilization of petroleum hydrocarbons from the vadoselsaturated zones; <br /> • Evidence of biodegradation. <br /> Prior to starting the AS test, groundwater table elevation and dissolved oxygen in groundwater will <br /> be monitored with field instruments in MW-1,MW-2, MW-3, the proposed well to the west of the <br /> former UST#3, and SVE-1C. In addition, observation well pressure, and soil gas parameters <br /> (oxygen, carbon dioxide, methane, and organic vapors)will be monitored with field instruments in <br /> MWA, MW-2, MW-3, the proposed well to the west of the former UST#3, SVE-1A/B/C, and SVE- <br /> 28 <br /> The AS test equipment will include an oil-less air compressor, air-hoses, flow gauges and multiple <br /> pressure gauges connected to air-tight well caps. during the tests, air from the compressor will <br /> be injected into the air sparge test well, and pressure readings will be collected from the test well <br /> and the observation wells (MW-1, MW-2, MW-3, the proposed well to the west of the former UST <br /> #3, SVE-1Al8/C, and SVE-28). <br /> The test well and observation wells will be monitored with field instruments every 30 minutes <br /> during the 4-hour AS test. The monitoring parameters will include the water table elevation, air <br /> injection pressure, operating pressure, injected air-flow rate, observation well pressure,dissolved <br /> oxygen in groundwater, and the soil gas parameters (oxygen, carbon dioxide, and organic <br /> vapors). Thirty minutes atter the completion of the 4-hour test, the final monitoring parameters will <br /> be measured. <br /> Bill A. Cook III, P. G., C. E. G. <br /> CWEA certified Environmental Compliance Inspector <br /> Associate Geologist <br /> bcook@condorearth.com <br /> Condor Earth Technologies, Inc. <br /> 188 Frank West Cr. Suite I <br /> Stockton, CA 95206 <br /> Phone: (209) 234-0518 <br /> Fax: (209) 234-0538 <br /> Company Website: www_Qndorearth.com <br /> Condor GIS Services: www.condordataserver.com <br /> Map and Dairy Services: http:l/wwtw.condormaps.com/iDwispi <br /> 5/18/2011 <br />