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3164 Gold Camp Drove <br /> Delta Smote 200 <br /> rancho Cordova CA 95670 <br /> . Env�ronmentai 916638 2485 <br /> Consultants,Inc FAX 91&638-8385 <br /> 638-8385 <br /> August 25, 1995 <br /> Ms. Maria Guensler <br /> Exxon Company, U S A <br /> 2300 Clayton Road, Suite 490 <br /> Concord, California 94520 <br /> Subject Extended Air Sparging Test Results Report <br /> Exxon Retail Station No 7-3708 <br /> 2705 Country Club Boulevard <br /> Stockton, California <br /> Delta Project No D093-809 <br /> Dear Ms Guensler <br /> Delta Environmental Consultants, Inc (Delta), was authorized by Exxon Company, U S A to <br /> conduct an extended air spargmg test at the subject site (Figures 1 and 2) The purpose of the test <br /> was to assess the effectiveness of air sparging as a possible remediation method for dissolved <br /> 40 petroleum hydrocarbon constituents in ground water underlying the site <br /> The air sparging test was started on March 13, 1995 An air compressor was used to introduce <br /> compressed air into ground water monitoring well MW-3 at a pressure of 15 to 20 pounds per square <br /> inch, and a flow rate of approximately 5 cubic feet per minute The air compressor was secured in <br /> a temporary equipment compound, and temporary aboveground piping was used to transport the <br /> compressed air to the well The air was sparged into the well in 30 minute intervals. The air <br /> spargmg test was completed on July 17, 1995, and the spargmg equipment was removed from the <br /> site <br /> Due to mechanical problems with the air compressor, the spargmg of air into test well MW-3 was <br /> interrupted on several occasions during the 126 day period for which the test was run. The effect <br /> these interruptions may have had on data collected during the test is unknown It should be noted <br /> that any trends or lack of trends interpreted from the data collected may have been significantly <br /> different if the spargmg had operated continuously during the entire test period <br /> Monitoring of the test well (MW-3) and observation wells (MW-1 and MW-4 through MW-6) was <br /> performed on the first day of the test during the first 5 hours, and then during periodic site visits for <br /> the remainder of the test over the next 126 days Locations of each of the wells are illustrated on <br /> Figure 2 Parameters that were monitored include dissolved oxygen(DO), soil vapor carbon dioxide <br /> content, and pressure Dissolved oxygen data in parts per million (ppm), carbon dioxide data in <br /> percent, and pressure data in inches of water were measured at each of the wells during the first day <br /> of the test, and on each of the following site visits 'This data is presented in Tables 1, 2, and 3, <br /> respectively, which are located in Enclosure A Graphs have also been constructed for the data <br /> presented in Tables 1 through 3. These graphs are located in Enclosure B <br /> Providing a Competitive Edge <br />