SITE INFORMATION AND CORRESPONDENCE

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Michael Oliphant - 2- 11 March 2014 Tracy Rail Yard Offsite—West Shallow groundwater in the vicinity of the Site is not currently used and is not anticipated to be used in the near future as a municipal or private drinking water supply, and thus the potential exposure to groundwater was not evaluated in the HHESE. As such, a complete exposure pathway to groundwater does not exist for current or future Site-use conditions. The HHESE findings indicated that the risk scenario considered is a conservative estimate and actual risks are believed to be much lower. Exposure to petroleum hydrocarbons in shallow soil should not result in an unacceptable health risk for a resident adult or child at the Site or to ecological receptors. Based on investigative findings, including the risk assessment evaluation, the residual crude oil associated with the historical TAOC pipelines does not appear to pose an unacceptable risk to human health or the environment. The groundwater plume appears stable or is shrinking and the residual crude oil remaining in the soil and groundwater will naturally degrade, likely over a period of years. A Fact Sheet was distributed to nearby property owners in February 2014 requesting comments to a no further action request for the Site be submitted within 30 days. Comments from owners of one property were addressed during a telephone conversation. No other comments were received. Provided the information submitted by Chevron was accurate and representative, no further action is appropriate for the above-referenced property. Please be advised that this letter does not relieve Chevron of any liability under the California Water Code or Health and Safety Code for past, present, or future operations at the Site. A no further action designation does not relieve Chevron of any responsibility to clean up existing, additional, or previously unidentified conditions at the Site that cause or threaten to cause degradation or nuisance or otherwise pose a threat to water quality or public health. Any person aggrieved by this action may petition the State Water Resources Control Board (State Water Board) to review the action in accordance with Water Code section 13320 and California Code of Regulations, title 23, sections 2050 and following. The State Water Board must receive the petition by 5:00 p.m., 30 days after the date of this action, except that if the thirtieth day following the date of this action falls on a Saturday, Sunday, or state holiday, the petition must be received by the State Water Board by 5:00 p.m. on the next business day. Copies of the law and regulations applicable to filing petitions will be provided upon request or may be found on the Internet at http://www.waterboards.ca.gov/public notices/petitions/water quality/index.shtml. If you have any questions, please contact Dean Hubbard at the above address, by telephone at 559-445-5179 or email dean.hubbard(a�waterboards.ca.gov. 4 C7 l Y - 4', aa C. Creedon Executive Officer Enclosure: 10 March 2014 Staff Memorandum cc: San Joaquin County EHD, Stockton Michael Hurd, Leidos, Oakland