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Page 1 of 1 <br /> Mike Infurna [EH] <br /> From: Matt Hanko <br /> Sent: Monday,April 14, 2003 6:33 PM <br /> To: Mike Infurna [EH] <br /> Subject: Ranch Market <br /> Mike: <br /> Thanks for the return call and the suggestion for the e-mail message. <br /> The soil vapor influent data has decreased significantly since the soil vapor extraction (SVE)system was <br /> initiated. The Secor May 2, 2002 Work Plan for Remedial Approach and Well Installation indicated that after <br /> approximately 4 months of operation the Cat-Ox/SVE system would be replaced with a different SVE blower and <br /> activated carbon based on operation costs. Geocon will be shutting down/removing the Cat-Ox system before the <br /> end of the month and installing and starting a new SVE blower plumbed to activated carbon. The historical soil <br /> vapor influent concentrations are attached. <br /> Geocon wanted to give SJCEHD the courtesy of notification prior to initiating the action. No response is <br /> necessary unless you would like to discuss. It is my impression that the way the Secor Work Plan was prepared <br /> that no pre-approval by SJCEHD is necessary for the switch from Cat-Ox to activated carbon. <br /> Regards, <br /> Matt Hanko <br /> Geocon Consultants, Inc. <br /> 925-371-5900 <br /> 4/15/2003 <br />