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~XLE DEWAT~RING SYSTEM CONSTRUCTION DETAIL September 1, 1992 APPLICANT: SITE HUMBER: Kenneth Gsllagher 92-3113 Your site has been found suitable for a TILE DEWATERING ALTERNATIVE SEWAGE DISPOSAL SYSTEM. The following construction specifications shall apply to the installation of your septic system. 1. The septic tank shall have a minimum liquid capacity of 1000 gallons. 2. The projected daily sewage flow for this project is calculated at 450 ~allons Der gaY. Based on soil conditions observed on this site, the disposal field will be sized at 125 lineal feet Der 150 q~%%onS Of projected daily sewage flow. A minimum of ~7..5 lineal fe~ of disposal field will be required for your proposed develop- ment. The disposal trenches are constructed two (2) feet wide and on minimum ten (10) foot centers and with no line exceeding 125 feet in length. The trenches and perforated pipe are installed level (il") and contoured to follow the natural ground surface. 3. The disposal field shall be constructed with e~ual distribution with a minimum trench depth of ~ and a maximum trench depth of 24 inches. There must be at least ~ of backfill over the top of the gravel, measured from the natural ground 4. Field collection tile shall be rigid, smooth walled perforated pipe with a four (4) inch minimum diameter. The tile shall be installed with a minimum depth of 36 inches and with a uniform grad~ of 0.2 to 0.4 f~et per 100 feet. Maximum tile spacing shall be 70 feet, center %e center, with a minimum 20 foot setback from the disposal trenches. The collection tile shall be enveloped ia clean filter material (drain rock) to within 12 inches of the ground surface. The filter material shall be covered with filte~ fabric, treated building paper or other non-degradable material. A silt trap with a minimum diameter of 30 inches shall be installed between the collection system and the outlet pipe. The trap shall have a 12 inch sump below the invert of the outlet. The outlet pipe shall be smooth walled solid pipe with a minimum four (4) inch diameter. That portion of the outlet which daylights shall be constructed of a heavier pipe (Sch. 40 or better) with a flap gate or screen to exclude rodents. The outfall shall be set =o avoid backflow into the pipe. This approval is site specific to the area tested and the septic system must be located in the immediate area of the test pits unless otherwise autho~ rised by this office. A new site evaluation may be required if the system is proposed for a different area on the property. SPECIAL CONDITIONS: The septic tank shall be certified watertight and shall have a riser, which extends to the ground surface~ over the access manholle. Any other openings in the top of the tank shall be sealed watertight, with silicon caulking. I T~IS I$,,,NQT A PERMIT TO ,~NSTA3~L THE ~E~IC S¥STEM~ DO N0~,,,JNST~?.?. THE SYSTEM ~NTIL A V~_LID PERMIT HAS HEEN I~S~ BY THIS OFFICe.