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WASTE DISCHARGE REQUIREMENTS ORDER R5-2013-0028 -8- DELICATO VINEYARDS, INC. DELICATO FAMILY VINEYARDS SAN JOAQUIN COUNTY 28. Aeration ponds PW-1 and PW-2 will be constructed as earthen basins with sloped berms constructed of native or imported fill material. The aeration ponds will be constructed with a single 60-mil high density polyethylene (HDPE) liner. The maximum allowable water depth in the two aeration ponds will include two feet of freeboard. The final dimensions and liner specifications of the two aeration ponds will be determined during final design, which will be documented as part of a Wastewater Pond Design and Pond Liner Construction Quality Assurance (CQA) Plan. 29. Aeration ponds PW-1 and PW-2 will provide temporary detention of process wastewater and storm water flow from Winery Sumps#1, #2, and #4. The two aeration ponds will normally be used on an alternating basis to provide treatment and temporary storage during periods when wastewater flows exceed agronomic rates for irrigation at the new LAAs and for redundancy during intervals of non- operational maintenance (i.e. solids removal, liner repairs, etc.). PW-1 and PW-2 may be operated in parallel to provide storage capacity during peak crush season flow. 30. Under normal operating conditions, water flowing into the wastewater aeration ponds will be immediately distributed to the LAAs. Effluent from the aeration ponds will be filtered as needed to prevent clogging of irrigation systems. Solids that accumulate in the aeration ponds will be removed in a manner that does not compromise the integrity of the pond liner. Large solids or debris will be removed by hand while finer solids accumulated on the side of the liner will be rinsed down to a collection sump in each of the aeration ponds. Initially, one aeration pond will be used for wastewater while the other aeration pond will be used to store supplemental irrigation water provided by the South San Joaquin Irrigation District. The second aeration pond will be converted to use for wastewater storage after the current unlined wastewater ponds are cleaned out and reconstructed to store supplemental irrigation water. Removal of sediment sludge and placement of a compacted clay liner in the reconfigured storage basins should reduce the flow of percolate through residual wastewater constituents in the vadose zone beneath the existing unlined wastewater ponds. 31. Based on current wastewater monitoring data and the design of the proposed wastewater system, effluent from the two aeration ponds is expected to be similar to current effluent water quality. Flow-weighted average effluent concentrations from 2002 through 2011 are tabulated below. Annual Flow-Weighted Mean Result(mg/L)' pH i BOD Sulfate NO3 as N TKN TDS VDS FDS 3,987 154 1.4 32 1,442 736 706 7.7 Average values from 2002 through 2011 2 pH values are reported as annual median values from crush and non-crush maximums.