Current through Register Vol. XLI, No. 24, June 14, 2024
Section 47-11-4 - Coin operated and other fee generating car washing establishments4.1. The following minimum requirements are established for coin operated and other fee generating car washing establishments.4.2. Any coin operated and other fee generating car washing establishment located such a publicly owned treatment works and sewerage system is available to handle and treat such wastewater shall direct its wastewater to the publicly owned treatment works. A coin operated or other fee generating car washing establishment so situated need not install a pretreatment system unless the POTW certifies to the establishment that it could not handle and treat the establishment's wastewater without minimum pretreatment as set forth in subdivision 4.2.b. 4.2.a. A car wash discharging to a POTW without pretreatment of the wastewater must adhere to local plumbing codes and to any special local ordinances or regulations regarding acceptance of waste at the sewage treatment plant.4.2.b. A car wash pretreatment system at a minimum shall consist of a device to prevent large objects from entering the sewer lines and a settling tank to remove settleable solids and shall comply with the applicable requirements of the local sewer use ordinances or regulations including the pretreatment requirements of section 14 (NPDES Series 10 rules) where applicable.4.3. Any coin-operated or other fee generating car washing establishment located such that a POTW is unavailable or incapable of handling or treating the wastewater from such establishment shall either direct its wastewater to an approved sewage treatment facility or shall apply to the chief for a permit to construct, install and operate a disposal system. The disposal system to be constructed, installed and operated must meet the following minimum requirements, in addition to those prescribed elsewhere by law: 4.3.a. Substantial removal of all settleable solids.4.3.b. Substantial removal of five (5) day biochemical oxygen demand.4.3.c. A grease trap shall be installed and properly maintained within to prevent oil and grease from entering the wastewater treatment facility.4.3.d. A grit removal chamber shall be installed in such a manner to be readily cleaned.4.4.e. A car wash discharging wastewater to a receiving stream and primarily for recreational pursuit and supporting sport fisheries may be required to provide treatment in addition to the minimum requirements of the above cited 4.3.a. to 4.3.d.4.4. A car wash which does not provide treatment facilities under subsection 4.3 shall provide impervious holding facilities for wastes and the wastes must be transported to an approved wastewater treatment plant for treatment.4.5. A car wash employing a reuse system shall provide proper disposal of settleable materials.4.6. The following systems are non-allowable and will not be permitted:4.6.a. Septic tanks with or without leach fields.4.6.c. Direct or indirect discharge of untreated or improperly treated wastewater from coin-operated or other fee generating car washing establishments to the waters of the state.