SITE INFORMATION AND CORRESPONDENCE_FILE 2

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San Joaquin County DIRECTOR °U.I" Environmental Health Department Donna Heran,REHS _. � ASSISTANT DIRECTOR 600 East Main Street Laurie Cotulla, REHS Stockton, California 95202-3029 PROGRAM COORDINATORS .: . .; �;r• - - - - Margaret Lagorio,REHS C` r�� '�P Website: www. Robert McClellon,REHS °<rFoa° Phone: (209) Kasey Foley, 468-3420 Jeff Ca ey,, RREHSREHS, RDI olEHS Fax: (209)464-0138 15 September 2009 Mr. Paul Zumberge Frontier Transportation, Incorporated 3577 West Philadelphia Chino Hills, California 91710 Subject: Frontier Transportation, Incorporated 425 Larch Road Tracy, California 95376 On August 28, 2009, a conference call was conducted between personnel from the San Joaquin County Environmental Health Department (EHD), Frontier Transportation, Incorporated (Frontier), and Winefield & Associates, Inc. (W&A). Mr. Anthony Osterkamp of Frontier stated to the EHD that reimbursement by the California State Water Resources Control Board (SWRCB) under the underground storage tank (UST) Cleanup Fund (CUF), has been suspended resulting in great financial hardship as the CUF owes Mr. Osterkamp approximately $300,000 for work completed. Mr. Osterkamp also stated that the proposed remediation (dual-phase extraction and ozone injection) is estimated to cost an additional $500,000, and he requested the EHD to slow down implementation of future directives until the CUF can reimburse Frontier for work already completed. Although the EHD is receptive to further reductions in sampling of wells if proposed and justified by your consultant, your site is significantly impacted and the EHD can not approve an indefinite delay in addressing the concerns posed by the unauthorized release (UAR) on your site; furthermore, an assessment of the hazard your UAR poses to sensitive receptors is needed to properly manage your site and move it toward remediation and closure. Following the conference call, the EHD rechecked the sensitive receptor survey after noting that for most of the Tracy area, the groundwater gradient is toward the north, but on your site it is toward the west. The EHD noted that there is a concentration of water supply wells west of your site that may be pulling your plume in that direction. This raises the concern that your plume has impacted or may eventually impact one or more wells toward the west. At this time the highest priority for your site is to complete the assessment of the extent of your plume in the down- gradient direction, toward the west, and to sample the water wells closest to your source area (the proximal wells) down-gradient of your site for laboratory analysis for the chemicals of concern related to your UAR: total petroleum hydrocarbons (TPH) quantified as gasoline (TPH-g); benzene, toluene, ethyl benzene, and total xylenes (BTEX); methyl tertiary-butyl ether (MTBE), ethyl tertiary-butyl ether (ETBE), di-isopropyl ether (DIPE), tertiary-amyl methyl ether (TAME), tertiary butyl alcohol (TBA), 1,2-dichloroethane (1,2-DCA), and 1,2-dibromoethane (EDB).