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l Orono High School Phase II Renovations Plumbing Plan No. 096474 Page 3 June 15, 2009 10. Water supply connections to fixtures or equipment which have submerged inlets, or inlets below the spill line of the fixture or equipment,must be provided with an air gap arrangement, approved backflow preventer or backflow preventer assembly as specified in Minnesota Rules,part 4715.2000 and part 4715.2010. This shall include the potable water connections to the garbage can washer,the ice maker, and all potable water connections to equipment not shown. 11. It appears that the proposed solids interceptor for the art room sinks,Manufacturer: Schier,Model No.USI 1180, shown on Sheet No.M101,is of a drum trap design. Drum traps may only be used if permitted by the administrative authority(see Minnesota Rules,part 4715.0960),therefore,the use of the specified interceptor must be approved by the city of Long Lake. 12. Drainage fittings must be used for all portions of the island vent located below the floor(see Minnesota Rules,part 4715.2655). 13. Where each shower space is not provided with an individual waste outlet,the waste outlet must be located, and the floor must be pitched, so that water from one shower space does not flow over the floor area serving another shower(see Minnesota Rules,part 4715.1380, subpart 2). Verify that this requirement is met for the Boy's Shower,Room No.A009, shown on Sheet No.M114. 14. It appears that the shower drain(SH-2)and the trench drain receptor(FD-1),located in the Boy's Shower, Room No.A009,will be common vented. A common vent may serve two similar fixtures if each fixture drain connects independently to a vertical drain at the same level. Otherwise,individual vent pipes must be provided on the dedicated fixture branches(see Minnesota Rules,part 4715.2580, subpart 1). Verify that a code complying venting installation will be installed. 15. The capped fixtures shall be gastight and watertight for the pressure required by test(see Minnesota Rules, part 4715.0700). 16. Double wyes may not be used for drainage fittings in the horizontal position(see Minnesota Rules, part 4715.2420, subpart 3). Proper pipe slope cannot be maintained on both of the offset branches. 17. The installation of chemically resistant pipe shall be in accordance with manufacturer's installation recommendations. If ASTM Standard F1412 polyethylene,ASTM Standard F1412 polypropylene,or ASTM Standard F1673 polyvinylidene fluoride (PVDF)pipe is used,above grade horizontal piping may not exceed 35 feet in total length. Above grade vertical stacks may not exceed 35 feet in total height unless an approved expansion and contraction joint is installed at intervals not to exceed 35 feet(see Minnesota Rules,part 4715.0610). 18. PVC plastic pipe used for the drain,waste, and vent system shall comply with ASTM Standard D2665, D2949 or F891 (see Minnesota Rules,part 4715.0570 through part 4715.0600). Solvent weld joints in PVC and CPVC pipe must include use of a primer which is of contrasting color to the pipe and cement. A one- step solvent cement complying with ASTM Standard F493 or D2846 may be used for CPVC joints(see Minnesota Rules,part 4715.0810, subpart 2).Plastic pipe must be installed in accordance with Minnesota Rules,part 4715.0580(F)and part 4715.0600. Above-grade horizontal runs of plastic waste and vent pipe cannot exceed 35 feet in total length. Above-grade vertical stacks constructed of plastic pipe may exceed 35 feet in total height only if an approved expansion joint is used.