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Orono, MN Code of Ordinances Page 3 of 3 1. Eledrical connedion. i. A watertight,lockable electrical box must be mounted on a four-inch-by-four-inch treated redwood or cedar post. ii. 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. iii. Alarm and pump floats shall be on separate electrical circuits. iv. Electrical wire from the power supply must not run over any tanks but must be laid beside the tanks and placed in conduit along the electrical post. v. 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. 2. Pumping chamber. i. 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 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. ii. When the soil depth above the pressure distribution pipe is less than 3Yz 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 equivalent. iii. A reserve capacity equaling 75 percent of the anticipated daily flow must be allowed in the pumping chamber between the alarm activation level and the pump tank inlet. d. Drainfields. 1. Trenches.Trenches must meet Minnesota Rules chapter 7080. 2. Mounds and atgrades. Mounds and at-grades must meet specifications per Minnesota Rules chapter 7080. (3) Compliance standards. a. A new system shall be located,designed and constructed as a code system. b. When an existing code system is repaired or expanded,such ISTS shall remain a code system.Compliant systems,when repaired,shall be upgraded to a code system status whenever such classification is reasonably attainable. (4) Construdion procedures. a. 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. b. Favorable weather required. Drainfield area or trench construction must not proceed if the area is wet or has had rain within 48 hours.Mound or trench construction shall not proceed unless the soil moisture content is below the plastic limit. c. Construction inspection required.The contractor issued a permit for ISTS construction shall perform all work according to the design specifications approved by the city for each particular ISTS.All subsurface work, including building sewer,sewage tanks,distribution system and soil treatment area shall be inspected by the city inspector prior to backfilling or covering of any portion thereof. It shall be the responsibility of the contractor to notify the city at least 24 hours prior to the time an inspection will be required,and it shall be the responsibility of the contractor to ensure that the inspection is accomplished and the construction is approved prior to any backfilling,covering or continuation of the construction. (Code 1984,§12.30(5);Ord. No. 100 2nd series,§4,2-10-1992;Ord. No. 147 2nd series,§§ 11-15,5-13-1996;Ord. No. 199 2nd series,� 1(1230(5)),5-8-2000;Ord. No.38 3rd series,§ 1,9-24-2007) about:blank 3/31/2016