Agenda - Council - 08/08/1989 - Closed Executive Session and Regular Meeting

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17. A grass cover shall be established by the owner or the owner's agent over the soil treatment area. Dual Field Systems 1. Dual field systems shall be used only whare the percolation rate is slower than five minutes per inch. 2. Dual field systems shall be sized, designed, and constructed as set forth above for standard systems except as follows: The soil treatment area shall be divided into two or more parts. Alternating soil treatment areas shall each be connected to a valve box outlet. 3. A part of the soil treatment area shall be used no more than one year unless inspection of the effluent level indicates that a longer duration can be used. Slowly Permeable Soils 1. Excavation for the purpose of constructing a soil treatment system must not be made in any soil layer having a percolation rate slower than 120 minutes per inch. 2. Excavation for the purpose of constructing a soil treatment system must not be made in a soil layer having a percolation rate slower than 60 minutes per inch unless the moisture content is lower than the plastic limit of the soil. 3. Drainfield rock must not be placed in contact with original soil having a percolation rate slower than 60 minutes per inch. 4. Where the percolation rate of the original soil is slower than 60 minutes per inch, at least 12 inches of fill material having a texture defined as sand must be placed between the drainfield rock and the original soil along the excavation bottom. 5. Construction equipment wheels or tracks must not be placed in contact with the bottom of the excavation during the construction of a soil treatment system in soils having a percolation rate slower than 15 minutes per inch. 6. The size of the soil treatment system must be based on an acceptance rate of 0.24 gallons per square foot, which is equivalent to a sizing factor of 4.2 square feet per gallons per day.