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`" FALL CREEK <br /> REPORT OF WASTE DISCHARGE F.NGINF.F.RTNG.INC. <br /> 14.. <br /> Iftw <br /> %W (N) IRRIGATION SPRINKLERS <br /> IN GRASS FIELD <br /> (E) FLOOR DRAINS p p <br /> 1%WI_L—JI <br /> N PUMP BASIN (N) PUMP TANK WITH <br /> WITH <br /> WITH HIGH PUMP SYSTEM <br /> HIGH VOLUME <br /> `' EFFLUENT PUMP <br /> No. v <br /> %W STORMWATER <br /> (N) 0.22 ACRE DETENTION AREA <br /> %W n_ (N) SEPTIC TANK WETLAND <br /> (N) LOW HEAD <br /> SELF CLEANING <br /> `W SCREEN FILTER <br /> Figure 4.1. Schematic of Proposed Wastewater Improvements <br /> Figure 4.1 shows the existing floor drains that catch the process wastewater from the <br /> winemaking operations as well as the storm water at the facility. From the drains water flows via <br /> gravity to a pump basin that has a low head—high volume effluent pump. The combined <br /> wastewater will be pumped from the collection basin over a screen filter. The screen will <br /> separate solids from the wastewater. From there water will flow into a new septic tank and via <br /> gravity into a subsurface flow wetland. The wetland has been sized to treat the process water <br /> and reduce the concentrations of nutrients and organic material by as much as 98%. After the <br /> wetland, water will flow into a pump tank with a duplex pump system. Treated effluent will be <br /> pumped to sprinklers in a grass field. The pump basin will also have an overflow to the existing <br /> storm water detention area to divert storm water when the irrigated grass field has already <br /> received its optimal amount of water. <br /> %W 4.3 System Analysis <br /> Subsurface wetland treatment systems can remove a significant amount of BOD from <br /> *"' wastewater. Wetland treatment systems have been used for many years to treat various <br /> w1m• municipal and industrial wastewaters. In recent years, wetlands have also been used to treat <br />`, winery wastewaters (Shepherd et al, 2001). FCE performed water balance and surface loading <br /> rate calculations to assess the feasibility of the wetland treatment system. <br />*- 4.3.1 Water Balance Calculations <br /> *. <br /> Monthly water balance calculations were performed for the wetland, grass disposal area, and <br /> stormwater detention area at Jessie's Grove Winery. Each element in the water balance <br /> (wetland, grass, and stormwater detention area) has inflows and outflows. Inflows come from <br /> process water, stormwater, direct rainfall, and overflow from the proceeding element. Outflows <br /> include infiltration, evaporation, and overflow to the succeeding element. Figure 4.2 shows each <br /> of the variables in the water balance and how they relate to each element. Further descriptions of <br /> the variables follow. <br />%NW JESSIE'S GRovE WINERY 13 FEBRUARY 2004 <br />*sr <br />