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Wastewater Treatment System Engineering Report ECREEK ++'' ENGINEERING, NEERING,INC. 5. LAND DISPOSAL SYSTEM DESIGN AND ANALYSIS The treated Winery process wastewater and stormwater will be applied to a vegetated slow rate land disposal system. This section presents an irrigation plan and analysis for the disposal area. 5.1. Irrigation Plan Approximately 0.6 acres of perennial grass will be used to dispose of the Winery's treated process and stormwater. This plan describes the guidelines for the irrigation method and scheduling at the Winery. 5.1.1. Irrigation Method — Treated wastewater will be conveyed to the disposal fields using a simplex pump system controlled by floats. An automatic distribution valve will sequentially direct the treated wastewater to four different zones through 2"mains and 1" laterals. Each of the four irrigation zones will cover approximately 0.25 acres using three sprinkler nozzles. Disposal field irrigation at Jessie's Grove Winery will be performed using impact sprinklers. The nozzles are rated with a flow rate of 5.5 gallons per minute (gpm) at a pressure of 25 psi. -- Each nozzle will have a throw radius of 39' and will be designed to overlap approximately 40%. Therefore the average aerial application rate (Ra) will be approximately: 5.5 g°� R — """ *1.4*12'"*60`"'" = 0.16 '" (7.481 Rl`)*4778sf rt hr hr Using ten sprinkler nozzles, each with a flow rate of 5.5 gpm, the total flow rate to each zone will be approximately 16.5 gpm or 990 gallons per hour. The pump used to supply the irrigation system is sized to have an operating flow rate of approximately 16.5 gpm with an operation `, pressure of 79 feet. 5.1.2. Irrigation Scheduling The irrigation schedule will be set by the supply of water from the wetland. The floats in the _ effluent pump basin should be set as far apart as possible to maximize the irrigation period and minimize pumping frequency. The pump basin that is specified in the design plan has inside dimensions of 10'2"L x 5'l"W. After considering float placement, it was determined that the operating volume within the tank will be approximately 2'l". This means that with this tank and corresponding pump and float placement, the operating volume will be approximately 805 _ gallons. With a pumping rate of approximately 990 gallons per hour, irrigation sets will last approximately 49 minutes. _ The average daily process water flow during September, the peak crush month, will be approximately 1,660 gallons per day under existing conditions. This means that it is likely that 2 irrigation zones will be irrigated each day during the crush period (1,660 gallons/805 gallons per — pump cycle = 2.1 cycles). Since the cycle will last 49 minutes at an average aerial application JESSIE'S GROVE WINERY MAY 2002 20