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1 Sand, Oil & Grease (SOG) Policy Requirements 1. Purpose The purpose of this document is to minimize the introduction of SOG into the City’s Wastewater Collection System. Accumulation of SOG can adversely affect the City’s Wastewater Collection System by producing blockages which can result in sanitary sewer overflows. 2. Applicability This document shall apply to all nonresidential establishments that discharge SOG in any concentration, including but not limited to car washes, auto service shops, laundromats, and elevator pits. These requirements shall also include: 2.1 New Construction 2.2 Interior remodeling to accommodate expansion or operational modifications 2.3 Changes of ownership / occupancy 2.4 Facilities which are experiencing difficulty in achieving compliance with maintenance and / or wastewater discharge limitations 2.5 Facilities adversely affecting the City’s Wastewater Collection System and/or Wastewater Treatment Facility, as determined by the City. 2.6 Existing facilities without grease interceptors unless specifically exempted by the City Establishments described above shall discharge all process wastewater to a City approved SOG interceptor. Each business establishment for which an interceptor is required shall have an interceptor serving only that establishment. Common or shared interceptors are not permitted. All under slab construction requires drawings from a professional engineer and must be approved by the City of Kalispell’s Industrial Pretreatment coordinator (IPC) prior to construction. The City’s IPC shall inspect/approve all pretreatment related construction prior to backfilling. ---PAGE BREAK--- 2 3. Business Owner’s / Discharger’s Responsibilities: The standards set forth in this section are minimum standards; therefore, this section does not intend nor imply that compliance by any person will ensure that there will be no contamination, pollution, nor unauthorized discharge of pollutants. 3.1 Implementation and adherence to the City’s SOG Best Management Practices (BMP’s). 3.2 Installation and other requirements for SOG interceptors: A. Sizing shall comply with the following SOG Sizing Calculation: The minimum capacity of a SOG is 500 gallons. The maximum size of a SOG is 2,500 gallons. Facilities requiring SOGs larger than 2,500 gallons shall install multiple interceptors in series to accommodate the additional system load. The Formula for SOG is: SOG Capacity = Process floor space (sq.ft.) x 7.48 gallons Use factor from Table below Use Category Use Factor Truck Wash Heavy Equipment Wash Commercial Automatic Car Wash 3 square feet Commercial Car Wash (hand sprayer) 6 square feet Automotive Service Shop 15 square feet Storage Area Warehouse 100 square feet Parking Garage 1,000 square feet Contact the Industrial Pretreatment Coordinator for Use Categories not listed. B. Interceptor/sample port design shall comply with the City’s Standards for Design and Construction drawings “PT.3, PT.4, and PT.7”. Waterproofing all pretreatment related concrete structures shall conform with City’s Standards for Design and Construction drawing “SA.3”. C. Installation, operation and maintenance per manufacturer’s specifications. D. Interceptor shall be located in an area that allows for easy cleaning and inspection. Lids shall be installed in a manner that allows for easy removal. Concrete lids are prohibited. E. SOG interceptors and sample ports located in traffic areas shall meet H-20 loading requirements. F. City’s IPC shall determine cleaning frequency. G. Do not discharge the top level of a parking garage to an SOG if it is exposed to storm events. This level shall be drained to the stormwater system. ---PAGE BREAK--- 3 3.3 SOG Interceptor Abandonment Abandoned SOGS shall be closed by: A. Removal of entire contents of SOG. B. Capping of the inlet and outlet pipes. C. Filling of the empty SOG with an appropriate fill material, e.g., sand. D. Permanently securing all openings to the interceptor, e.g., cement, weld. 4. City of Kalispell’s Responsibilities: 4.1 Inspections Authorized personnel of the City, bearing proper credentials and identification, shall have the right to enter upon all properties subject to this program, at any time and without prior notification, for the purpose of inspection, observation, measurement, sampling, testing or record review, as part of this program. 4.2 Enforcement Enforcement of these regulations shall be in accordance with the provisions of the City’s Public Works “Pretreatment Program Enforcement Response Plan.” The enforcement response is based on the type of violation(s) and the number of occurrences. Failure to comply with this program will be grounds for penalty imposition and/or discontinuance of service. 4.3 Permitting (Not Applicable at this time) – Memorandum of Understanding in place of as follows: Permits shall be in place and enforced for all businesses that meet the following criteria: A. Businesses which are assessed surcharges for high strength waste as defined in the City of Kalispell’s Resolution NO. 5968 B. Businesses with a history of noncompliance with this policy and / or the City’s FOG BMP’s, as determined by the City. Permitting shall follow all requirements described in the City of Kalispell’s Ordinance_____. Articles 4-6. Revised 01/10/2022