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OWTS. No basement, footing or surface drainage or discharge from water softener, iron filters, pool filters, or water treatment systems shall be permitted to enter any part of the OWTS. 1.10.2 The OWTS shall consist of a building sewer, a septic tank, distribution box, and a drainage system. Holding tank systems, alternative treatment systems, and lift or pump stations may also be included in an OWTS. Alternative treatment systems and engineered systems will be evaluated on their specific design. a) Where soil porosity and available land area permit, the drainage system shall consist of a subsurface horizontal leaching field. b) Where soil porosity and available land area do not permit the use of a shallow subsurface horizontal leaching field, and an adequate absorption soil stratum can be found at a greater depth without endangering ground or surface waters, the effluent may, in combination with a shallow subsurface horizontal leaching field, be discharged into one or more sumps or seepage pits, to a maximum depth of 25 feet. c) Alternative treatment systems or engineered systems may be proposed in lieu of a standard septic system. The alternative treatment system or engineered system must be designed by a Qualified Professional, as defined in the Water Quality Control Policy For Siting, Design, Operation, and Maintenance Of Onsite Wastewater Treatment Systems as adopted by the State Water Resources Control Board on June 19, 2012, and must meet the discharge requirements set by the Environmental Health Department or the Central Valley Regional Water Quality Control Board for the particular system or plant. d) Holding tank systems, alternative treatment systems and engineered systems are required to obtain an annual operating permit from the Environmental Health Department when monitoring, sampling, and reporting is required, or as determined necessary by the Director of Environmental Health. Other OWTS may be required to obtain an annual operating permit, as determined necessary by the Director of Environmental Health. e) The dispersal field shall maintain the minimum distance from groundwater as noted in the table below. Table 1.10.2 - Minimum Soil Depth from the Bottom of the Dispersal System to Groundwater p Percolation Rate Minimum Depth 51 MPI Engineered System Required 1 MPI <_ 5 MPI Twenty (20) Feet* 5 MPI 15 30 MPI Eight (8) Feet* 30 MPI <_ 120 MPI Five (5) Feet > 120 MPI Engineered System Required MPI = minutes per inch *Note: Or as mitigated by the system design or enhancement EHD 42-014 Page 5 of 40 OWTS Standards 1/2017