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J Stonebay Plumbing , Plan No. 061159 Page 2 October 6, 2005 2. The flammable waste trap shall be constructed in accordance with the Minnesota Plumbing Code, Minnesota Rules,part 4715.1120. The interceptor shall include: a. A minimum holding capacity of 35 cubic feet. b. At least 3 feet of depth below the invert of the discharge pipe. c. A water seal of not less than 3 inches on the inlet and not less than 18 inches on the outlet. d. A minimum size 3-inch vent must extend separately through the roo£ The vent must rise vertically or within 45 degrees of the vertical to a point at least 6 inches above the interceptor. The vent shall be constructed of approved metallic pipe material. e. Drains that discharge into the interceptor shall be designed to drain dry,and be at least 3 inches in size. f. The interceptor shall be located so it is readily accessible for service and maintenance. 3. The outlet branch drain serving the flammable waste interceptor is more than 25 feet from a vented drain. Therefore,the discharge line must be provided with a 2-inch vent pipe within 25 feet of the interceptor(see Minnesota Rules,part 4715.1120). 4. Cleanouts shall be of the same nominal size as the pipes they serve up to 4 inches in size(see Minnesota Rules,part 4715.1000). A cleanout must be installed where there is an increase in pipe size. 5. A backwater valve shall be installed on a waste branch serving fixtures that are located below the elevation of the building sewer at the point where the sewer crosses under the curb or property line. This branch shall receive waste from only the basement fixtures(see Minnesota Rules,part 4715.1160). The backwater valve must have a provision for maintaining the check in an open position during normal,non-backflow conditions. 6. The water supply line to the automatic clothes washer must be protected against backflow by the use of an air break or approved vacuum breaker. The discharge must be through an air break(see Minnesota Rules, part 4715.1230). 7. Elevator pit drains must discharge to the sanitary sewer through an indirect connection which precludes the possibility of sewage backup into the pit. If a sump is used,a dry-pan drain must discharge to the sump; the sump must be located outside the elevator pit; and a pump must be installed. The waste pipe from the sump shall discharge indirectly to the sanitary waste system through a fixture that is trapped and vented(see Minnesota Rules,part 4715.1305). 8. The domestic dishwasher is not shown connecting to the drainage piping. Verify it discharges into the kitchen sink or into the inlet side of the kitchen sink P-trap(see Minnesota Rules,part 4715.1590, subpart 3). The dishwasher outlet must rise to a peak as high as possible beneath the counter before turning downward and connecting to the kitchen sink. 9. Whirlpool bathtubs and their installation must comply with the following requirements: a. Whirlpool bathtubs and their installation must comply with ANSI A112.19.7M and ANSI A112.19.8M. b. The waste control device must be located at the tub outlet. c. Panels must be provided to allow access to the pumping equipment. d. If a shower spray is to be provided, it must be equipped with an approved backflow preventer and an anti-scald control valve complying with ANSUASSE Standard 1016-90.