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IP <br /> • <br /> San Joaquin County <br /> Environmental Health Department <br /> DIRECTOR <br /> P <br /> 2: y Donna Heran,RENS <br /> 600 East Main Street <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Robert McClellon,REHS <br /> Jeff Carruesco.RENS, RDI <br /> cq� FQRa/P Website: www.sjgov.org/ehd Kasey LndaTurley Re. HS <br /> Phone: (209)468-3420 <br /> EHS <br /> Fax: (209)464-0138 <br /> August 5, 2011 <br /> Mr. Paul Zumberge <br /> Frontier Transportation, Incorporated <br /> 3577 West Philadelphia <br /> Chino Hills, California 91710 <br /> Subject: Frontier Transportation, Incorporated <br /> 425 Larch Road <br /> Tracy, California 95376 <br /> Dear Mr. Zumberge: <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Addendum <br /> to Corrective Action Plan (addendum), dated 18 April 2011, prepared by your consulting firm, <br /> Ami Adini & Associates, Inc. (AA&A), on your behalf. The addendum was submitted in <br /> response to a request from the EHD during a telephone conference attended by AA&A and <br /> EHD personnel on 29 March 2011. <br /> In the addendum, AA&A proposes to add 5 additional dual-phase extraction (DPE) wells to the <br /> high-vacuum dual-phase extraction (HVDPE) system proposed by AA&A to treat <br /> contaminated soil and groundwater at the above-referenced site. The proposed 11 DPE well <br /> locations are illustrated on Figure 1 of the addendum. In an email dated 24 May 2011, AA&A <br /> revised the screen interval of the DPE wells from 4 to 20 feet below ground surface (bgs), to 6 <br /> to 20 feet bgs to adjust for corrected depths to wader In monitoring well MW-3R. In the original <br /> Corrective Action Plan, dated 18 October 2010, AA&A had proposed collecting soil samples at <br /> 5-foot intervals between 15 and 25 feet bgs for lithologic evaluation and analysis for total <br /> petroleum hydrocarbons as gasoline (TPH-g); total petroleum hydrocarbons as diesel <br /> (TPH-d); benzene, toluene, ethylbenzene, and total xylenes (BTEX); methyl tertiary-butyl <br /> ether (MTBE), ethyl tertiary-butyl ether (ETBE), tertiary amyl methyl ether (TAME), di- <br /> isopropyl ether (DIPE), and tertiary butyl alcohol (TBA) during the advancement of the soil <br /> borings. In the opinion of the EHD, soil samples should be collected at 5-foot intervals <br /> between 5 and 20 feet bgs to verify the presence or absence of contamination. With these <br /> revisions, the EHD approves the two 30-day HVDPE events proposed by AA&A in the <br /> Corrective Action Plan using the newly installed extraction wells. <br /> On 12 July 2011, the EHD posted public notification of pending approval by this department of <br /> the Corrective Action Plan to implement remediation at this site. The public has 30 days to <br />