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No f=urther Action Required Determination -2 - 19 November 2009 Former Lyoth Loading Station & Lyoth Offsite residents and/or construction/trench workers. The consultant's findings supported by the California Office of Environmental Health Hazard Assessment (OEHHA) concluded that the residual crude oil remaining at both Sites does not pose a threat to human health for the construction/trench worker scenario. Additionally, the theoretical lifetime cancer risk calculated from the updated HRA is within an acceptable risk range for an assumed residential-setting scenario at the former loading station. Based on the characterization reports' findings combined with the risk assessments, the documentation provides the appropriate technical data and rationale to support a NFAR determination for both Sites. Central Valley Water Board staff received the Soil Management Plan (SMP) for both Sites dated 2 June 2009, that provides guidance for whoever may conduct future excavation and/or maintenance activities at both Sites. The SMPs, which designate Chevron as the responsible party for any issues that arise confirmed to be related to the crude oil leaks, was submitted to the owner of the former Lyoth Loading Station and the Lyoth Offsite properties determined to overlie affected soil and groundwater. Copies of the SMPs were provided to San Joaquin County Environmental Health Department staff. The owner of the Sites determined to overlie the affected area(s) and the owners of unaffected properties within a 500-foot radius of the approximate boundary of the affected soil and/or groundwater on both Sites, were notified by certified mail of the proposed closure and the opportunity to provide comments to Chevron's request for NFAR determination. No comments were received during the 30-day comment period. Provided the information submitted to this agency was accurate and representative, no further action is needed at the above-referenced Sites. If existing, additional, or previously unidentified chemical constituents confirmed to be associated with the former crude oil pipelines at the former Lyoth Loading Station and Lyoth Offsite project Sites cause or threaten to cause pollution or nuisance or are found to pose a threat to public health or water quality, then: 1) nothing in this determination is intended or shall be construed to limit or preclude the Central Valley Water Board or any other agency from taking enforcement action, and 2) this letter does not relieve Chevron of any responsibilities mandated under the California Health and Safety Code and the California Water Code. If you have any questions, please contact Dean Hubbard at (559) 445-5179. Pamela C. Creedon Executive Officer Attachment: Consideration of No Further Action Required Determination Memorandum cc: Harlan Knoll, San Joaquin County EHD, Stockton Karen Fitzgerald, UPRR, Omaha, NE Hoffman Brothers Harvesting, Tracy Joe Kowalski, Escalon Michael Hurd, SAIC, Oakland Michael Jenkins, SAIC, Sacramento