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� ' r ! Hennepin County Orono Maintenance Facility Expansion Plumbing Plan No.PLB1412-00075 Page 2 December 19,2014 3. The combination fire protection/domestic water service shall comply with the backflow protection requirements of AWWA-M14, Chapter 6 (1990)with the exception that the following statement is deleted from section 6.3: "At any time where the fire sprinkler piping is not an acceptable potable water system material,there shall be a backflow-prevention assembly isolating the fire sprinkler system from the potable water system." Fire sprinkler systems in which corrosion inhibitors or other chemicals may be introduced either directly or by pumper connections require a reduced pressure zone(RPZ)backflow preventer on the public water supply. Local jurisdictions may require additional backflow protection. Please contact the local water purveyor for information concerning their requirements. 4. Pressure vacuum breakers must be installed at least 12 inches above spill line and no possibility of back pressure permitted. If a hose will be installed,the backflow preventer must be installed above the highest point that the hose will located when in use. The minimum recommended height is 6 feet 6 inches. 5. The plans indicate that a faucet with a hand-held sprayer will be provided. If it is possible to submerge the sprayer and contaminate the potable water system,then an approved backflow preventer shall be provided on the water supply to the sprayer(see Minnesota Rules,part 4715.2100). 6. The flammable waste interceptor installation shall comply with Minnesota Rules,part 4715.1120: a. The interceptor shall be located so it is readily accessible for service and maintenance. b. The interceptor may be constructed either: (i)of monolithic poured reinforced concrete with a minimum floor and wall thickness of six inches,(ii)of iron or steel of a minimum thickness of 3/16 inch,protected with an approved corrosion resistant coating on both the inside and the outside,or(iii)of fiberglass resins that comply with ASTM C581 and meet IAPMO Material and Property Standard,PS 80-2003b, for clarifiers. 7. Showers and combination showers-baths shall be equipped with individual thermostatic,pressure balancing, or combination thermostatic and pressure-balancing control valves in accordance with ASSE 1016(see Minnesota Rules,part 4715.1380, subpart 5). The maximum temperature setting must be set or adjusted in accordance with the standard and should not exceed 110 degrees F. 8. Equipment used for heating water or storing hot water shall be protected by approved safety devices in accordance with Minnesota Rules,part 4715.2210 and part 4715.2230. 9. In no case shall water from roofs be allowed to flow upon the public sidewalk(see Minnesota Rules, part 4715.2700). Verify that the discharge from all rainwater leaders will meet this requirement. 10. Sheet M1.1 shows 8-inch storm drainage pipe serving approximately 11,700 square feet of roof area exiting the building. A 8-inch horizontal storm drain can only accommodate 11,500 square feet of roof area at a 1/8 inch per foot slope(see Minnesota Rules,part 4715.2710,subpart 4).Verify that the referenced 8-inch horizontal storm drainage pipe is sloped'/a inch per foot slope at a minimum or else the pipe shall be increased to 10 inches in diameter. 11. All portions of the storm sewer system located within 10 feet of the building or water service line must be tested in accordance with Minnesota Rules,part 4715.2820.