SR0083595_SSNL - Laserfiche WebLink

Home Browse Search

r torm water management will be by on-site retention by the Dairy separation basin and holding ond. Percolating rainwater from open, cropped and non-cropped areas may theoretically provide water table dilution effect to the water table nitrate concentrations. NLS§3.2. The operation of the wastewater management system for the mitigation of nitrate loading will take advantage of evapotranspiration and the uptake of effluent nitrogen through a grass area planted over the disposal field. III. NITRATE LOADING STUDY FINDINGS A. WASTEWATER FLOW VOLUME PROJECTIONS AND CHARACTERISTICS Wastewater Flow Volume Projections To determine nitrate-nitrogen loading from any project, wastewater flow volumes must be determined as accurately as possible. Flow volume projections will be approximated from the potential number of on-site owners/employees and customers/truck drivers, as illustrated in Table 3. There are four owners, and due to the fact that the dairy will be automated robotically, only one employee will be required. Two proposed restrooms and a sink in the break room, as illustrated on the Site Plan, will be the only domestic wastewater fixture units for this project. According to EHD standards, people who are associated with a facility, whether they are employees are not, must have access to available restroom facilities. The following chart illustrates the Employees/Customers/Vehicles per work day used to calculate the anticipated wastewater flow volumes. TABLE 3 y %. ✓�� / l`�7 per Day 4 Owners+ 1 Employee=5 1 1 Milk Tanker Driver+ 1 Customer=2 Taking a reasonable usage factor of eight gallons per day/seven days per week: (1.6 gpf+0.4 gals/handwash x 2=4.0 gals AM+4.0 gals PM = 8 gpd)for each class of on-site people: Total usage = 8 on-site people x 8 gpd/person= 64 gpd x 7 days per week= 448 gpw x 52 wks/yr=23,296 gpy. Wastewater Characteristics Blackwater will originate from toilets and graywater from hand washing. Additional wastewater constituents may consist of other liquids to the system, such as coffee,juices, etc. Industrial or commercial chemicals, solvents, etc. must not be introduced into the wastewater treatment system. i The scientific literature cites nitrogen concentrations in domestic septic effluent typically ranging from 17 mg N/L for graywater to 140 mg N/L for blackwater toilet wastes. 5 Chesney Consulting