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• • Page 1 of 4 <br /> Vicki McCartney [EH] <br /> From: Gabriele Baader[gabi@amiadini.com] <br /> Sent: Tuesday, July 03, 2012 5:13 PM <br /> To: Vicki McCartney [EH] <br /> Subject: Frontier Transportation, 425 Larch Road in Tracy, Your Request for DPE Costs <br /> Dear Ms. McCartney, <br /> Here are the requested costs. A summary of the work is provided for explanation. <br /> Please contact me if you need anything else. The corrected reports will be uploaded this week. <br /> Have a wonderful 4th of July Holiday! <br /> Kind regards, <br /> Gabi <br /> RE: Dual-Phase Extraction Remediation Event and Report dated April 13, 2012 <br /> FRONTIER TRANSPORTATION <br /> 425 Larch Road,Tracy, California <br /> San Joaquin County Environmental Health Dept. Case No. 2251 <br /> Global ID T0607700719 <br /> UST Cleanup Fund Claim No. 12886 <br /> On behalf of Frontier Transportation, Inc. (FTI), Ami Adini &Associates, Inc. (AA&A) submitted a <br /> Corrective Action Plan (CAP) dated October 18, 2010 to the San Joaquin County Environmental Health <br /> Department(SJCEHD) in response to the SJCEHD directive dated May 21, 2010. Upon reviewing the <br /> CAP, the SJCEHD issued a letter dated February 4, 2011, requesting additional information. <br /> Accordingly, AA&A submitted the Addendum to Correction Action Plan dated April 18, 2011,which <br /> proposed to install 11 dual-phase extraction wells and conduct a 30-day treatment event utilizing dual- <br /> phase extraction(DPE). The CAP and Addendum were approved by the SJCEHD in a letter dated <br /> August 5,2011 (Attachment A). <br /> In October 2011, AA&A installed 11 DPE wells in preparation of initiating remediation at the subject <br /> site. The time and expenses associated with the well installation were previously submitted to the <br /> Underground Storage Tank Cleanup Fund(USTCF) in AA&A's invoice number 2023 dated February <br /> 22, 2012. <br /> On February 6, 2012, AA&A transported the equipment to the site and set up for operations. On <br /> February 8, 2012, the system was started for regular operations, and vapor sampling was conducted on <br /> the individual wells to provide a baseline set of data. The system was started using wells DPE I, DPE2, <br /> and DPE4 in combination, as these were identified as the best producers by the initial vapor sampling <br /> event. The well combinations were switched frequently after February 14, 2012 to maximize subsurface <br /> air flow and affect a significant portion of the subsurface. Extraction was conducted using flexible hoses <br /> connected to the wellheads. Stingers were used consistently at about 10 feet bgs, as this proved the most <br /> productive extraction interval. The system was operated for a total of 606 hours in this operational <br /> period. On March 13, 2012,the system was shut down. <br /> 7/9/2012 <br />