Wastewater treatment and holding devices

Wastewater treatment and holding devices. (1) Scope. The provisions of this section set forth the requirements for design and installation of plumbing wastewater treatment and holding devices, appurtenances and systems, including but not limited to interceptors, catch basins, decontamination tanks and dilution and neutralizing basins. (2) Materials. All piping, devices and appliances for wastewater treatment and holding devices, appurtenances and systems shall be of approved materials in accordance with ch. SPS 384 . (3) General. Any deleterious waste material which is discharged into a plumbing system shall be directed to a wastewater treatment or holding device. The wastewater treatment or holding device shall be capable of separating, diluting or neutralizing the deleterious waste material to a degree that the wastewater is no longer deleterious. Wastewater treatment or holding devices that retain any waste materials shall be designed and installed to facilitate periodic removal or treatment, or both. (a) Treatment for reuse. 1. Except as limited in subd. 2. , graywater, storm water, clear water, blackwater and other wastewaters as approved by the department may be reused in conformance with s. SPS 382.70 . 2. Except as provided in subd. 3. , wastewater discharged from water closets or urinals shall not be reused for drinking water. 3. All treatment works permitted by the department of natural resources, or a POWTS which includes an in situ soil dispersal or treatment component may treat wastewater discharged from water closets or urinals for reuse. (b) Deleterious waste materials. For the purpose of this subsection, deleterious waste materials include any waste material, other than that from dwelling units, which may: 1. Congeal, coagulate or accumulate in drains and sewers, thereby, creating stoppages or retarding the discharge flow; 2. Retard or interfere with municipal sewage treatment processes; 3. Pass through a treatment process and pollute the watercourse receiving the treatment effluent; 4. Create explosive, flammable, noxious, toxic or other hazardous mixtures of materials; or 5. Damage, destroy or deteriorate sewers or piping materials or structures. (c) Private systems. The special or industrial wastes from any plumbing system shall be treated, held or dispersed in compliance with the rules of the state agency having jurisdiction. The treatment, holding or dispersal system shall be installed so as not to endanger any water supply which is or may be used or which may create a nuisance, unsanitary conditions or water pollution. (d) Velocity control. Interceptors, catch basins and other similar devices shall be designed, sized and installed so that flow rates shall be developed and maintained in a manner that solid and floating materials of a harmful, hazardous or deleterious nature will be collected in the interceptor for disposal. (e) Maintenance. All devices installed for the purpose of intercepting, separating, collecting, holding or treating harmful, hazardous or deleterious materials in liquid or liquid-borne wastes shall be operated and cleaned of intercepted or collected materials or of any residual from treatment at such intervals which may be required to prevent their passage through the interceptor. Grease interceptors shall be maintained on a cycle not to exceed 90 days or per manufacturer’s instructions. (f) Service reassembly. Any fixed orifice, vent or trap of an interceptor, catch basin or other similar device shall remain intact and shall not be removed or tampered with except for cleaning purposes. After service, all parts of the interceptor, collector or treatment device, such as baffles, weirs, orifice plates, channels, vents, traps, tops, and fastening bolts or screws shall be replaced in proper working position. (g) Location. 1. Wastewater holding devices, interceptors, catch basins and other similar devices shall be accessible for service, maintenance, repair and inspection. a. No wastewater holding device, interceptor, catch basin or similar device may be surrounded or covered as to render it inaccessible for service or inspection. b. No wastewater holding device, interceptor, catch basin or similar device may have its top located more than 6 feet above the surrounding floor. c. Enough space shall be provided to enable the removal of any interior parts of the wastewater holding device, interceptor, catch basin or similar device. d. At least 18 inches of clear space shall be provided above the top of the wastewater holding device, interceptor, catch basin or similar device. 2. An exterior wastewater holding device, interceptor, catch basin or similar device shall not be located within 5 feet of a building or any portion of a building or swimming pool; 10 feet of water service; 2 feet of a lot line and 10 feet of a clearwater cistern. 3. An exterior wastewater holding device, interceptor, catch basin, or similar device shall not be located within 10 feet of the high water mark of a lake, stream, pond or flowage. 4. An exterior subsurface treatment tank holding component, or reservoir to be installed in an area subject to saturated conditions, shall be installed to effectively prevent flotation of the tank or component. (h) Disposition of retained materials. Deleterious waste materials retained by a wastewater holding device, interceptor, catch basin or similar device shall not be introduced into any drain, sewer or natural body of water without approval of the state agency having jurisdiction. (4) Garage floor area wastewater. (a) Garages for public buildings and facilities. 1. Where a drain will be installed to receive the wastewater from floor areas of public buildings and facilities on which self-propelled land, air or water vehicles can be driven, the wastewater shall discharge using one of the following methods: a. In areas where vehicles will be serviced, the wastewater shall discharge through a garage catch basin or oil interceptor connected to a municipal sewer or holding tank approved to receive industrial wastewater. b. In areas where vehicles will be driven or stored, the wastewater shall discharge through a floor drain equipped with a solid bottom sediment bucket, garage catch basin or oil interceptor. 2. Garage catch basins design shall conform to all of the following: a. The holding area of the catch basin shall be watertight. b. The catch basin shall have a minimum inside diameter of 36 ″ . c. The minimum depth of the basin shall be 24” measured from the lowest portion of the trap on the outlet of the basin. d. The outlet of the basin shall be at least 4” in diameter and trapped with a water seal of at least 6” and constructed on the interior or exterior of the basin. Where an external trap is provided, the trap shall be within 36” of the basin. e. Except as provided in subd. 5. , the water line in the basin shall be at least 2” below all horizontal drains discharging into the basin. Where an external trap is provided, the measurement point on the horizontal drain shall be upstream of the trap. f. The basin shall be provided with a cover at least 23 inches square or 23 inches in diameter. g. Gravity drains from fixtures serving garage floor areas located on different floors from the basin may discharge into the basin if the drain stack carrying the wastewater is located at a distance equal to at least 20 times the inside diameter of the horizontal piping upstream of the basin. h. Catch basins with solid covers shall be vented in accordance with sub. (8) (c) . 3. Drains with traps may connect to the garage catch basin under all of the following conditions: a. The trap shall be a minimum of 3” in diameter. b. Except as provided in subd. 3. c. , the developed length from all trap outlets to the basin shall not exceed the distance as specified in Table 382.31-1. c. Where the maximum distance exceeds that as specified in Table 382.31-1, the trap shall be vented in accordance with s. SPS 382.31 (3) and the connection to the basin shall form a 6-inch trap seal. The trap seal may be constructed on either the interior or exterior of the basin, but within 36” of the basin. 4. Drains without traps may discharge into a garage catch basin under all of the following conditions: a. The fixture drain shall have a minimum 4-inch inside diameter. b. The fixture drain shall be piped with a 6-inch water seal constructed either on the interior or exterior of the basin. c. An exterior trap shall be constructed within 36” of the basin. d. The developed length of the fixture drain shall not exceed the distance equal to 24 times the diameter of the fixture drain. e. Fixture drains shall individually discharge into a garage catch basin. 5. Pressurized drains from garage floor areas discharging to a garage catch basin shall conform to all of the following conditions: a. The pressurized drain piping shall terminate inside the basin with a 6-inch submerged inlet. The termination shall be at least 12” above the floor of the basin. b. The pressurized equipment, devices and piping shall be designed and installed to produce a maximum velocity of 2 feet per second at the point of connection to the basin. (b) Garages for one- and 2-family dwellings. 1. Floor drains serving garages for one- and 2-family dwellings shall be provided with a removable solid bottom sediment basket.