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Sewage disposal Systems § 8130 <br />d. 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 />�I <br />e. All joints between pipes and fittings in the building sewer shall <br />have watertight and root -tight joints. Portland cement mortar <br />joints shall not be allowed. Lines shall provide a grade of not less <br />than _ 125 inch per foot. Where building sewers exceed 50 feet in <br />length, lines shall 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 />Subd. 3. Septic tan�-s. <br />a. General. All tanks, regardless of material or method of <br />construction, shall be: <br />1. One piece, precast; <br />2. Watertight; <br />3. So designed and constructed as to withstand all lateral earth <br />pressures under saturated soil conditions with the tank <br />empty, <br />4. So designed and constructed as to withstand a minimum of 7 <br />feet of saturated earth cover above the tank top, <br />5. Not subject to excessive corrosion or decay. <br />b. Design. All tanks, regardless of material or method of <br />construction, shall conform to the following design criteria. <br />1. The liquid depth of any septic tank 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 />2. No tank or compartment thereof shall have an inside <br />horizontal dimension less than 24 inches. <br />3. Inlet and outlet connections of the tank shall be submerged <br />by means of baffles. <br />4. The volume in the tank between the liquid surface and the <br />top of the inlet and outlet baffles shall be not less than 207o of <br />the total required liquid capacity, except that in horizontal <br />cylindrical tanks, this space shall be not less than 15010 of the <br />total required liquid capacity. <br />5. Inlet and outlet baffles shall be constructed of acid resistant <br />concrete, acid resistant fiberglass, or plastic. <br />Printed 12/28/90 Page 241 <br />b <br />/771 <br />