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r �- City of Orono Septic System Approval ISTS DESIGN YES O 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 sewa e from the buildin served. Setbacks Feature Sewa Tank feet Soil Treatment Area feet Dee well 50 50 WeUand 50 50 General Develo ment Lake 75 75 Recreational Develo ment Lake 75 75 Natural Environment ake 150 150 Tributaries/Streams 75 75 Drivewa s,sidewalks,decks and other hardcover 10 10 Pro ert lines,buildin s and buried i es 10 20 �^ Lawn s rinkler s stems 10 10 Sewa Tanks. Number of Bedrooms Tanks Liquid Ca acities gallons 4 or less 1,000+ 1,000 r ardless of arba e dis osal use 5 or 6 1,250+ 1,000 re ardless of arba e dis osal use 7,8 or 9 1,500+ 1,500 re ardless of arba e dis osal use 10 or more Sewa e tanks shall be sized as other establishments er MN Rules 7080. Pum in Stations. In order to standardize installation and electrical connection methods,the following pumping station requirements must be met in addition to MN Rules cha ter 7080 Electrical connection: / A waterti ht,lockable electrical box must be mounted on a four-inch b four-inch treated redwood or cedar st. � All electrical connections shall be made within the box. Pump connection must not be made using a direct line lu -in onl . Wire ent to the electrical box shall be sealed with a waterti ht material such as foam or u . Alarm and um floats shall be on se arate 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 alon the electrical ost. 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 round contact. Pum in' `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 i�side 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- uarter inch wee hole must be used. When soil depths above the pressure distribution pipe is less than 3%Z feet,insulation must be added to achieve / an insulating factor equal to 3'/z 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 e uivalent. A reserve capacity equaling 75%of the anticipated daily flow must be allowed into the pumping chamber between the alarm activation level and the um tank inlet. Protection of d��infield ar.ea. � 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 undisturt�ed until drainfield construction is commenced. No vehicular traffic shall be allowed in the drainfield area either before or after d 'nfield installation. ACCEPTED DENIED by the Metro West on behalf of the City of Orono subject to existing regulations and the following condition : �e C m ..�.,d•�. A- �LK r•- �c �'+v �s g---- o-s�..� Inspe ons required: / �J / 1. �vL(S f So, f Va✓� {��A�i7��,po� 5. 2. o�.ce ... . 6. 3. �'� .� �v�.k ��0.,,or. 7. 4. (- v t ! K+- �� ts��'� 8. �r rf / [ B�y�� Printed Name: dC,�LE� /L� `1�13w Date: vri w:\septic�septic system approval revised 2-2015.docx Page 2 of 2