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Former Stefaano's Gas Station Page 2. <br /> 1419 East Charter Way March 18,2008 <br /> Stockton, California 95205 <br /> sparge points both will be capable of injecting approximately 0.95 pounds of ozone into the <br /> subsurface per day, the EHD presented the following concerns: i <br /> 0 How effective is the current on-going ES II system at remediating the hydrocarbon <br /> contamination found at this site? Ozone injections have been intermittent since January <br /> 2006; however, during this time there have.been no notable improvements associated <br /> with concentrations of contaminants detected in groundwater collected each quarter <br /> through July 2007, based on the most current quarterly report dated December 4, 2007. <br /> • Will the local effectiveness of the three individual spargers of the current ES II system <br /> be degraded by diverting approximately half of the ozone to the three newly proposed <br /> sparge points; or will the three newly proposed sparge points best be served.by omitting <br /> the currently installed sparge.points? In other,words, will this modification increase, <br /> decrease, or have a neutral influence on-the current system effectiveness? <br /> i <br /> i <br /> AGE responded by email ,on March 3, 2008, providing the EHD with soil boring logs for <br /> boreholes B-2, B-3, OZ1, OZ2, and OZ3 and reiterating what was proposed in Work Plan <br /> Addendum, .dated November 19, 2007. Unfortunately, the information does not address the <br /> concerns presented above by the EHD. Please provide the EHD with answers supported.by <br /> technical justification by April 30, 2008, that will support expanding the current ozone sparge <br /> system. <br /> If you have any questions, please contact Vicki McCartney, Senior Registered Environmental <br /> Health Specialist, at (209) 468-9852 or by email at vmccartney@sjcehd.com. <br /> Sincerely, <br /> Victoria L. McCartney, REHS Nuel C. Henderson, Jr., PG <br /> Senior.Registered Environmental Health Specialist Engineering Geologist <br /> c: Ms. Ally Colavita, Advanced GeoEnvironmental, Inc., 837 Shaw Road, Stockton, <br /> California 95215. <br /> Mr. James L.L. Barton, PG, California Regional Water Quality-Control Board Central y <br /> Valley Region, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670 <br /> t <br />