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Wastewater Treatment System `� `- �� FALL CREEK Engineering Report ENGINEERING,INC. 3.1. Parabolic Screen r. '�► The parabolic screen will be used to remove coarse solids from the process wastewater. The r„ manufacturer will size the screen the to handle at least 35 gallons per minute of winery process %W wastewater. Screen slot openings will be 0.010" and constructed of wire with round rod supports. The screen body will be constructed of stainless steel plate. 3.2. Septic Tank ti The new 5,000-gallon septic tank will settle screened wastewater. The tank will be used for wastewater stabilization and limited anaerobic digestion. Table 3.1 shows the expected detention times in the septic tank for monthly flows. During the months of crush (August through November) detention times range from 2 to 5 days. In the summer months, detention time is considerably longer because little if any process and storm water enter the system. Occasionally during the winter,detention time could be as little as one day due to stormwater entering the system. Table 3.1 Septic Tank Detention Times Septic Detention Month Inflow Time %W (gpd) (days) January 3,516 1.4 February 3,843 1.3 March 2,741 1.8 _ April 1,374 3.6 May 739 6.8 ' June 259 19.3 July 198 25.3 August 1,002 5.0 September 1,908 2.6 .., October 2,442 2.0 November 2,579 1.9 Decemberl 3,079 1 1.6 It is recommended that the Winery have the water treatment septic tank pumped at least once a year. The optimal time for septic pumping would be in late October or November once the majority of the crush has been completed. This will remove the accumulated solids from the process period and will reduce solids resuspension during higher winter flows. 3.3. Water Balance Calculations Monthly water balance calculations were performed for the wetland, grass disposal area, and `• stormwater detention area at Jessie's Grove Winery. Each element in the water balance (wetland, grass, and stormwater detention area) has inflows and outflows. Inflows come from process water, stormwater, rainfall, and overflow from the proceeding element. Outflows include infiltration, evaporation, and overflow to the succeeding element. Figure 3.1 shows each JESSIE's GROVE WINERY MAY 2002 �' 9