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r^.r A City of Orono Septic System Approval ISTS DESIGN YES NO NA ISTS design specifications shall include proposed flows or other sizing information,minimum sewage tank capacity, minimum soil treatment area requirements,a plan of the component layout and all other information necessary to assure the City that the ISTS is designed and will be constructed to receive,treat and dispose of all of the sewage from the building served. Setbacks Feature Sewage Tank(feet) Soil Treatment Area(feet) Deep well 50 50 Wetland 50 50 - General Development Lake 75 75 —, Recreational Development Lake 75 75 Natural Environment Lake 150 150 Tributaries/Streams 75 75 Driveways,sidewalks,decks and other hardcover 10 10 Property lines, buildings and buried pipes 10 20 i Lawn sprinkler systems 10 10 Sewage Tanks. Number of Bedrooms Tanks Liquid Capacities(gallons) 4 or less 1,000+ 1,000 regardless of garbage disposal use 5 or 6 1,250+ 1,000 regardless of garbage disposal use / 7, 8 or 9 1,500+ 1,500 regardless of garbage disposal use l 10 or more Sewage tanks shall be sized as other establishments per MN Rules 7080. Pumping Stations. In order to standardize installation and electrical connection methods,the following pumping station requirements must be met in addition to MN Rules chapter 7080 Electrical connection: A watertight,lockable electrical box must be mounted on a four-inch by four-inch treated redwood or cedar post. All electrical connections shall be made within the box. Pump connection must not be made using a direct line (plug-in only). Wire entry to the electrical box shall be sealed with a watertight material such as foam or putty. / Alarm and pump floats shall be on separate electrical circuits. Electrical wire from the power supply must not run over any tanks and must be laid beside the tanks and placed in conduit along the electrical post. Electrical cords from the pump and floats must be run through a two-inch PVC(or equivalent)conduit(schedule 80)with a one-inch gap between the conduit and the electrical box. Electrical cords must not run through or under the manhole cover. Wires must not have ground contact. Pumping Chamber: Pressure pipe exiting the pumping chamber must be laid on a uniform slope up to the soil treatment area for proper drain back. The pressure pipe must be sleeved and inside a larger diameter pipe for additional support if spanning ground that has been excavated. If the pipe at the tank must be lower than union to get elevation for drain back,a one-quarter inch weep hole must be used. When soil depths above the pressure distribution pipe is less than 3'/2 feet,insulation must be added to achieve an insulating factor equal to 3'h feet of soil to decrease the potential for freezing(Styrofoam or concentric piping are acceptable methods). Piping under hardcover, such as tennis courts or driveways shall be insulated pipe or equivalent. A reserve capacity equaling 75%of the anticipated daily flow must be allowed into the pumping chamber between the alarm activation level and the pump tank inlet. Protection of drainfield area. Proposed drainfield areas shall be identified and marked off on the lot at the time of the site evaluation and prior to any construction or grading occurring in the area. The drainfield area shall remain undisturbed until drainfield construction is commenced. No vehicular traffic shall be allowed in the drainfield area either before or after drainfield installation. ACCEPTED � DENIED by the Metro West on behalf of the City of Orono subject to existing regulations and the following conditions: /�' /eSCly.._�.+....Q 4l,2At... J / � c tisiMLA—mg- Inspections required: 1. 7`'Q A+KS sre ( 1/A-k, +e..L o.e� 5. 2. /Qor91( --eft 6. 3. 3-A-4-el, k oop -I fa, 1.1"c( 7. 4.F a4- v / 4- A— -It7 7r iw.t f 8. Lr0y2C�q� ea / Printed Name: �i &( G'k.) /`O /L,vAr.) Date: 0//6' w:\septic\septic system approval revised 2-2015.docx Page 2 of 2