1563 ORD AMENDING ORDINANCE NO 1074 ORDINANCE NO 1202 ORDINANCE NO 1508

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If the service facilities such as garbage grinders, washing ma- chines, etc., are to be served, the design should be increased 50% for each such facility; that is, for a home without special facilities the de- sign basis would be 50 gallons per capita per day, and if a washing ma- chine or garbage grinder is to be used the design would be 75 gallons per capita per day, and if a washing machine and garbage grinder are installed the design basis would be 100 gallons per capita, per day. The tank inlet and outlet shall be protected from clogging by the scum by the use of either 'Teetz connections or baffles. The 'Tee" or baffles , shall extend 12 inches below the liquid surface, and if the baffle is used it shall extend 6 inches or more above the liquid surface. PIain-end pipe may be used if baffles are provided. If 'Tees"ake used the inlet 'Tee't shall have the top plugged to prevent tank gases entering the house line, and thus escaping to the house plumbing. The outlet 'Tee" shall be screened at the tope with corrosion-resista.nt material to prevent scuxn overflow entering the effluent line. Elbow fitting will not be permitted. Section 3. All drainage field lines shall be designed and constructed after a percolation test has been made and approve'd by the Plumbing Inspector. The porosity of the soil shall be deterxnined by excavating a hole one foot square and of a depth equal to that at which it is proposed to lay the tile drain. The hole to be filled with water to insure thorough moistening of the soil and allow the water to seep away. Then while the bottom of the hole is still moist, fill to a depth of six inches and observe the time required for the water level to fall one inch. The approximate length of tile required per person based upon a trench 12 inches wide and a sewage flow of fifty gallons per capita per day, is given as follows: TABLE II Time for water to fall 1 inch in Minute s 2 3 4 5 10 15 30 60 Over 60 Approximate length in feet of 4" tile in 1 foot-wide trench for 50 gallons per day 25 30 35 40 50 65 90 120 Unsuita,ble The minimum length of open joinx drainage tile shall not be less than 150 feet, even though soil tests indicate fewer feet of drainage field would suffice. The effluent main from the septic tank shall be not less than 4-inch ti3;e , and it shall be a watertight line with a fall of 1 inch per 100 feet. The open joint laterals shall be laid on a grade of 1 inch fall per 100 feet, and each lateral shall not exceed 50 feet. The open joint lines shall be laid on top of a bed of gravel not less than 4 inches thick, and the gravel cover shall be not less than 2 inches over the tile. The 1-foot joints of the tile shall be laid with opening 1/4 inch between tiles, and the upper half of the joints shall be covered with a tar paper or other ma- terial which will prevent soil silting into the pipe and thus closing it. The gravel used in drainage trenches shall pass a screen h.aving 2 1/2- inch opening but be reta.ined on a screen having 1/2-inch openings. For accuracy of grades, the levels should be checked by an experienced operator using a farm level or better. instrument, and this requirement