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Matt Belair - 2 - 12 July 2013 Delicato Family Vineyards Details of the proposed wastewater aeration pond system design.. specifications, and schedule are consistent with requirements outlined in Order R5-2012-0028, therefore the Wastewater Pond Design is hereby approved. In accordance with the Flow Limitations of the WDRs, the flow limit will not be increased until the Executive Officer has approved the Wastewater System Improvements Completion Report. which is required to be submitted by 1 September 2013. Pond Liner Construction Quality Assurance (CQA) Plan Provision H.1.a of the WDRs required submittal of a CQA Plan that specifies the final design of the wastewater ponds and liner systems, liner material specifications, seaming methods, and details of anchorage and penetrations. Construction quality assurance procedures and test methods to ensure and verify that the liner subgrade preparation, installation, seaming, and integrity testing will be performed in accordance with the manufacturer's recommendations are summarized in the Process Water Storage and Related Improvements Project Manual (Appendix B of the workplan). Aeration pond excavation and construction will be conducted per recommendations made by a geotechnical engineer while all pipe penetrations, anchor connections, and other structural supports will be assembled per the manufacturer's specifications and under the direction of the CQA consultant. Field testing of the liner seams and welds will include non-destructive and destructive techniques to verify adequate integrity per ASTM D 5641 and ASTM D 5820. All liner installation, seam welding, and inspections will be performed by a licensed contractor under the direction of a licensed Civil or Structural Engineer. The CQA Plan provides sufficient detail of the proposed pond system design and specifications as required in Order R5-2012-0028 and is hereby approved. Use of the aeration ponds will not be allowed until after the Executive Officer approves the Wastewater System Improvements Completion Report, which is required to be submitted by 1 September 2013. Unlined Pond Closure Plan Provision H.1.a requires that an Unlined Wastewater Pond Closure Plan provide the process to be taken to close the existing two-acre unlined wastewater ponds and the specific methods that will be implemented to remove sludge and waste-containing sediments, verify adequate waste removal, document disposal, and describe additional actions to reduce future percolation of residual waste constituents in soil if the ponds are converted for the storage of irrigation water. The Unlined Pond Closure Plan proposes a two-step process to characterize soil conditions and implement closure of the area in preparation for other uses. After construction and certification of the new aeration ponds, the unlined ponds will be drained and dried. Trenching and soil sampling will then be conducted to characterize the nature and extent of sludge in the bottom and sidewalls of the unlined ponds. Soil samples will analyzed for nitrate as nitrogen, total Kjeldahl nitrogen, electrical conductivity, pH, and total organic carbon. Sampling and analysis of nearby shallow soil conditions will be also conducted for comparative purposes. After the completion of soil/sludge characterization activities, submittal of a separate Removal Closure Plan is proposed to provide appropriate documentation for mitigation related activities (i.e. Grading Permit, Stormwater Pollution Prevention Plan, Transportation Plan, Dust Control Plan, etc.). The excavation plan portion of the Removal Closure Plan would provide the results of soil and sludge characterization and the technical rationale for defining the estimated spatial extent and volume of impacted material that will be removed.