SITE INFORMATION AND CORRESPONDENCE_FILE 3

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4 San Joaquin County °�'" Environmental Health Department DIRECTOR )O. Donna Heran,REHS r.` 1868 East Hazelton Avenue PROGRAM COORDINATORS X Stockton, California 95205-6232 . Robert McClellon, REHS �:.. Jeff Carruesco, REHS, RDI • 0. .. Website: www.sjgov.org/ehd Kasey Foley, REHS F O R Phone: (209) 468-3420 Linda Turkatte, REHS Fax: (209) 464-0`138 April 9, 2013 Mr. Paul and Ms. Daren Zumberge Frontier Transportation, Incorporated 3577 West Philadelphia Chino Hills, California 91710 Subject: Frontier Transportation, Incorporated 425 Larch Road Tracy, California 95376 Dear Mr. Paul and Ms. Daren Zumberge: The San Joaquin County Environmental Health Department (EHD) has reviewed the three remedial options presented for the above-referenced site in an email dated 13 February 2013, from your consulting firm, Ami Adini & Associates, Inc. (AA&A). The remediation methods included: • A second 30-day high vacuum dual-phase extraction (HVDPE) remediation event, taking approximately ten weeks to complete, and costing an estimated $115,000.00; • Excavation, taking approximately forty weeks to complete, and costing an estimated $350,000.00 to $500,000.00; and • Subsurface Metabolic Enhancement (SME), taking approximately ninety-two weeks to complete, and costing an estimated $300,000.00 to $350,000.00. AA&A stated in the February 13th email that their mission is "to get cases to closure in the quickest, most economical, most predictable way'; and AA&A guaranteed that they would "carry out all necessary remediation work to take the case all the way to regulatory closure for a fixed sum of$600,000.00", and an anticipated case closure target date of twenty-four months or less, from the start of the project. The EHD has considered the three proposals presented by AA&A and has concluded that a second 30-day HVDPE event is the most cost-effective remedial method proposed and should be implemented based on the following: • In the Dual-phase Extraction Remediation Event Report, dated 13 April 2012, AA&A reported that approximately 2,057 pounds of total petroleum hydrocarbons as gasoline (TPHg) were removed by HVDPE between 8 February and 13 March 2012, indicating removal of approximately 43 percent of the original mass estimated to be in place prior to the HVDPE event, which the EHD considers a significant mass recovery rate;