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SUMMIT EmGINEERING, INC. Consulting Civil Engineers July 23, 2001 Project No. 2001015 Page B.3 iii) The pH adjustment will provide a more favorable environment (if necessary) for the growth of aerobic bacteria in the aerated lagoons; the ammonia will also serve as a supplemental nutrient in the biological process. The adjustment of the pH also reduces the chances for emission of hydrogen sulfide odors that can occur in a low pH environment. b) Flow measurement—An inline magnetic flow measurement device will be provided to measure flows from the PW pump stations to the facultative aerated lagoons. C) Solids removal screen — New motorized rotary drum screens will remove the large solids from the system at the receiving area and, as a result, reduce the organic biological loading on and the accumulation of solids in the aerated lagoon system. Solids from the screening operations will be treated as pomace (refer to solid waste section). 5. Facultative Aerated Lagoons -- Biological stabilization will occur in the facultative aerated lagoon (FAL) system consisting of two mechanically aerated ponds in Phase 1 and three mechanically k aerated ponds in Phase 2. This lagoon system will be large enough to provide a normal residence time of 64 days at average flow conditions during harvest (see page B.9 and 6.14). For ultimate process wastewater/rainfall inputs and evaporation/irrigation outputs, refer to the pond water balance (based on 100 year rainfall and a minimum two foot freeboard) in Enclosure C. I The total ultimate Phase 2 volume of the lagoon system is approximately 16.735 Mgal (Pond No. 1: 4.357 Mgal, Pond No. 2: 4.357 Mgal, and Pond No. 3: 8.021 Mgal), with a 2 ft minimum freeboard. j Surface mechanical aerators for the aeration cells will be sized to satisfy biochemical oxygen demand as well as oxygen dispersion requirements. Timer control of the aerators will be provided to allow operations personnel to adjust aerator operation to changing winery functions and pond conditions, i' i Treatment systems of this type have been utilized at a number of wineries in California and in other states; locations include: a Winery and Location Constructed Christian Brothers, South St. Helena 1972 Geyser Peak Winery, Geyserville 1973 Robert Mondavi Winery, Oakville 1974 Firestone Winery, Los Olivos 1975 Chateau St. Jean, Kenwood 1975 Buena Vista Winery, Sonoma County 1975 I Jordan Winery, Healdsburg 1976 Souverain Winery, Geyserville 1978 Beaulieu Vineyard, Rutherford 1982 Vichon Winery, Oakville 1982 Clos du Val Winery, Napa 1983 Louis M. Martini Winery, Sonoma County 1985 Ferrari-Carano Winery, Sonoma County 1986 Joseph Phelps Winery, Napa County 1988 Mumm Napa Valley, Napa County 1988 Montinore Vineyards, Washington Co., Oregon 1989