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r <br /> Advanced <br /> GeoEnvironmental, Inc. <br /> 10 July 2002 <br /> AGE-NC Project No. 95-0185 <br /> Mr. Harlin Knoll <br /> San Joaquin County- Environmental Health Department JUL Z 2003 <br /> 304 East Weber Avenue, third floor ENVIRONMENT HEALTH <br /> Stockton, CA 95205 PERMIT/SERVICES <br /> Subject: Feasibility Study Completion (Ozone injection) -April - June 2003 <br /> SHOCKEY AND ,SONS TRUCHING <br /> 850 Milgeo Avenue,Ripon, California <br /> Dear Mr. Knoll: <br /> At the request of Mr. Lee Shockey, Advanced GeoEnvironmental, Inc. (AGE) has conducted an <br /> ozone-sparging pilot test at 850 Milgeo Avenue, Ripon, California. <br /> A K-V Associates Criegee Oxidation (C-Sparge) system was installed and initiated operation on <br /> 04 April 2003 and was terminated on 10 July 2003. The ozone generator is utilized to produce <br /> gaseous ozone which is injected into the subsurface via microsparge points_ The "microbubbles" <br /> (approximately 50 micrometers)are forced out into the surrounding saturated soil and-react with the <br /> target analytes,producing carbon dioxide and water. The in-situ air stripping process utilizing fine <br /> bubbles of ozone-rich air,injected into saturated soil to extract and decompose dissolved petroleum <br /> hydrocarbon constituents. Ground water samples were collected twice from the existing monitoring <br /> well network and analyzed. An overall reduction of total petroleum hydrocarbon as diesel (diesel) <br /> was documented in the well with low and persistent concentrations of diesel and a reduction of the <br /> total petroleum hydrocarbon as gasoline (gasoline) was observed in wells with high concentration <br /> of both diesel and gasoline. <br /> As documented in their letter of 16 October 2003,the State Water Resource Control Board(USTCF) <br /> only approved a three month pilot test, therefore the evaluation of the results of the feasibility <br /> analysis will be based on the operation of the ozone injection over that time period. <br /> 837 Shaw Road,Stockton, California 95215 <br /> Telephone(209) 467-1006 FAX(209)467-1118 <br />