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I <br />'1 <br /> I <br /> I <br /> I <br /> <br /> I <br />I <br /> I <br /> I <br /> I <br /> I <br /> I <br /> I <br /> I <br /> I <br /> I <br /> I <br /> I <br /> <br />§ 8..°,0 <br /> <br />The portions of any buried sewer more than 50 feet from a well <br />shall be constructed of material as approved by the State <br />Plumbing Code. <br /> <br />All joints between pipes ~nd fittings in the building sewer shall <br />have watertight and root-tight joints. Portland cement mortar <br />joints shall not be ~llowed. Lines shall provide a grade of not less <br />th,n .125-inch per foot~ Where building sewers exceed 50 feet in <br />length, lines sb~l] provide a grade which will allow a flow velocity <br />of not less than 2 feet per second. In no case shall the grade <br />exceed 2%. All changes of grade shall be by means of long sweep <br />ells. Where long sweep ells are not used and where the direction <br />changes by more than 20.5 degrees, accessible watertight clean- <br />outs shall be provided. <br /> <br />Sub& & Septic tankx <br /> <br />a. <br /> <br />General. All tanks, <br />construction, shall be: <br /> <br />regardless of material or method of <br /> <br />1. One piece, precast; <br /> <br />2. Watertight; <br /> <br />3. So designed and constructed as to withstexld all lateral earth <br /> pressures under saturated soil conditions with the tank <br /> empty; <br /> <br />4. So designed and constructed as to withstand a m~uimum of 7 <br /> feet of saturated earth cover above the tank top; <br /> <br />5. Not subject to excessive corrosion or decay. <br /> <br />Design. All tanks, regardless of material or method <br />construction, shall conform to the following design criteria. <br /> <br />1. <br /> <br />of <br /> <br /> The liquid depth of any septic t~uk or compartment thereof <br /> shall be not less than 30 inches. A liquid depth greater than <br /> 6.5 feet shall not be considered in determining tank capacity. <br /> <br />2. No tank or compartment thereof shall have an inside <br /> horizontal dimension less than 24 inches. <br /> <br />3. Inlet and outlet connections of the tank shall be submerged <br /> by means of baffles. <br /> <br />4. The volume in the' tank between the liquid surface and the <br /> top of the inlet and outlet b~ffles shall be not less than 20% of <br /> the total required liquid capacity, except that in horizontal <br /> cylindrical tanks, this space shall be not less than 15% of the <br /> total required liquid capacity. <br /> <br />5. Inlet and outlet baffles shall be constructed, of acid resistant <br /> concrete, acid resistant fiberglass, or plastic. <br /> <br />Printed 12Y28/90 <br /> <br />Page 241 <br /> <br /> <br />