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240 6-108 In all cases where a liquid capacity of more than one thousand (1000) gallons is required, a special permit shall be necessary. This special pernut for the construction of a sewage disposal system shall be issued only after the applic,:mt has furnished the governing body with a complete 'plan designed by a registered engineer and approved by the State Health Department in writing. 6-109 The sewer line between the buildinF and the disposal tank shall have water tight joints. This sewer pipe shall have a gradient of not less than one-fourth (1/4) inch per foot of pipe except by special permission of the inspector. 6-110 Inlet and outlet corillections of the tank and of aach compartment thereof shall be submerged and baffled so as to obtain effective retention of scum and sludge. Scum storage volume (space bet.veen the liquid surface and the top of the inlet and outlet devices) shall be not less than fourteen(14) per cent of the total required liquid capacity. The tank shall be constructed in such a manner as to assure its being water tight to prevent the entrance of r~in water, drainage or ground water. It shall be constructed of sound and durable material not subject to excessive corrosion or decay. Access to each compartment of the tank for inspection and sludge removal shall be provided. Each inspection opening shall be provided with a re- movable coYer. The inlet and outlet devices shall be made accessible by a removable cover. Each tank shall be provided with a four (4) inch stand- pipe, the top of which shall be level with the ground or slightly above the ground and securely plugged. 6-111 The inlet baffle or submerged pipe shall extend approxi.rnately six (6) inches b'low the liquid surface. It shall also extend above the liquid surface at leas~ to the crown of the inlet sewer. The outlet ~arfle or submerged pipe and the baffles or submerged pipes between compartments sliall extend below the liquid depth. These baffles shall also extend above the liquid level to provide for scum storage; they shall be not less than six (6) inches above the liquid levle nor less than six (6) inches below the inlet baffle. Each baffle shall have a clearance between baffle and inside edge of tank of not less than seven (7) inches. 6-112 There shall be at least two (2) inches between the under side of the tank top and the top of inlet and outlet pipes or baffles and partit.ops to pro- vide the required ventilation of the tank and disposal field or seepage pits through the main building stack. 6-113 I-fetal septic tanks shall comply with the connnercial standard for the particu- lar tyPe of tank being used. These tanks shall have the required capacity as described in this code. 6-114 l{hen seepage pits are used with subsurface disposal trenches, the filter material in the trenches shall terminate at least six (6) feet from the pit excavation. The portion of the trench lying between the end of the filter material and the pit shall not be excavated below the grade of the tile. Bell and spigot pipe with tight joints shall be used in connecting the tile to the pit. Wherever possible, the bottom of the pit Shall be more than ten (10) feet aboe the water table; where~this is impossible the construction shall require approval by the State Department of Health. -37-