STORM WATER CENTRAL
Storm Water Pollution Hotline: (573) 364-8659
Federal regulations define an illicit discharge as “...any discharge to an MS4 that is not composed entirely of stormwater...” with some exceptions and are considered “illicit” because storm sewers are not designed to accept, process, or discharge this type of waste. Minimum Control Measure III provides for the implementation and enforcement of a program to detect and eliminate illicit discharge. Illicit discharges enter the system through either direct connections (e.g., wastewater piping either mistakenly or deliberately connected to the storm drains) or indirect connections (e.g., infiltration into the MS4 from cracked sanitary systems, spills collected by drain outlets, or paint or used oil dumped directly into a drain). The result is untreated discharges that contribute high levels of pollutants.
A crucial element of this minimum control measure is the mapping of existing infrastructure, including storm sewer, sanitary sewer, streams, impervious surfaces, and “hot spots”. Mapping of the storm sewer system demonstrates a municipalities awareness of intake and discharge areas and can be utilized to determine possible sources of illicit discharge.
What BMPs has Rolla implemented?
What does the permit say?
Legal prohibition through ordinance give the municipality a regulatory mechanism to authorize enforcement of any illicit discharge violators. A solid public education and outreach program assists the community in reducing illicit discharges without the need for legal ramifications.
Questions? Comments? Message us your feedback.
What BMPs are planned?
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This minimum control measure is closely tied to the continuation of existing or ongoing BMPs such as sewer televising, grease trap inspections, household hazardous waste collection. The BMPs that are in place have been very effective in reducing pollutants and will be continued.
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continued dry weather outfall screenings for illicit discharge
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site inspections of industrial and commercial facilities
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began, and will complete over the next month, an extensive field survey of over 500 storm sewer outfalls using a data collection spreadsheet tailor made for the city’s application. Upon completion, staff can develop a systematic inspection schedule and utilize it in conjunction with other mapped information will help determine the source of compromised outfalls.
2009
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completed mapping of the city’s private sanitary sewer laterals.
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survey and inventory information of the city’s storm water utility completely integrated into the city GIS mapping system including all watersheds, sub-watersheds, storm sewer inlets and pipes (approximately 60.4 miles), stream buffer zones, floodway, 100 year and 500 year flood zones, and approximately 220 storm sewer outfalls. All of this information is available for staff and public use. Yearly updates are performed to maintain the integrity of the system and its effectiveness.
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Potential sites for illicit discharge are inspected on a regular basis. These include:
• Sanitary sewer creek crossings – 3 times a year, including dye testing; database includes condition of pipe and list of debris
• Grease traps – 5 times per year or on an as needed basis for problem areas
• Sanitary sewer line smoke testing – the 12 square mile area of Rolla is divided into ten separate testing areas, or roughly 13.5 miles of sanitary sewer line per year; problem areas are tested on an as needed basis; database includes report findings
• Box culverts – 3 times per year; database includes condition and required action
• Detention ponds– 3 times per year; database includes condition and required action
• Visual inspection for floatables on a quarterly basis
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began working closely with City of Rolla Fire and Rescue to integrate hazmat data into a citywide database. Rolla Fire and Rescue has provided an inventory of all Tier 2 Hazmat sites within the corporate limits as well as spill incident reports.
2008
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approved the Voluntary Compliance Agreement for Wet Weather Discharges with Missouri Department of Natural Resources with a primary focus on inflow and infiltration. One possible facet of the project will involve the removal of sump pumps and area drains from the sanitary sewer system.
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work progressed on incorporating televising videos and photos into the city's GIS mapping system through assistance from the Trekk Design Group.
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completed an extensive field survey of over 500 storm sewer outfalls. Data collected included watershed, outfall ID, land use, pipe material and size, existing flow, quality of flow, an outfall photograph, and inspector’s comments. During 2010, the integration of this data into the city’s Geographic Information System was completed. S
2010
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implemented a storm water ordinance addressing illicit discharge violations and penalties
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developed storm sewer system map in the Geographic Information System (GIS)
2003
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sanitary sewer lines needing replacement were identified and contracted for construction
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last cluster area of septic tank usage eliminated
2004
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mapping of potential illicit discharge sites initiated along with possible flow paths
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Fire Department installs GIS laptops in fire engines to assist in spill containment
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policy requirements and enorcement for food service facilities on grease trap maintenance implemented
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inspections for illicit discharge based on random, complaint driven or scheduled visits
2005
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public meetings for projects has assisted in eliminating future potential pollution by replacing failing and older laterals as part of street reconstruction projects
2006
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began mapping private sanitary sewer laterals based on televising records
2007
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amended the storm water ordinance by including a section prohibiting the connection of all new roof drains to streets, sanitary or storm sewers and roadside ditches.
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City staff, members of HDR Engineering, Inc., and Missouri S&T continued to work on the wastewater system evaluation. The flow metering began at the Vichy Plant area.
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utilizing data collected through routine maintenance procedures, the city began repairing sanitary sewer mains with “cured-in place” pipe (CIPP) technology. In spring of 2011, Insituform Technologies, Inc. installed over 3,700 feet of new ¼-inch durable polyurethane in the sewer mains located in a residential neighborhood of Rolla.
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Citizen complaints were the catalyst for several new programs developed during the 2010-2011 reporting season. The Clean Stream Initiative, the result of a complaint based investigation, will provide for the installation of “No Dumping” signs along local streams. They will be provided free of charge to adjacent property owners, areas with repeat occurrences of littering, and along all creeks in city parks.
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A second program, stemming from staff observations and complaints, was the storm drain marker program.This ongoing program should result in a decrease in illicit discharge through a decrease in the use of storm sewer inlets as dump sites.
2011
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Insituform Technologies, Inc. installed over 5,165 feet of new ¼-inch durable polyurethane in the sewer mains and 310 feet in storm sewer mains located in a residential neighborhood of Rolla.
2012
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Developed and implemented a plan for dry-weather screening of storm sewer outfalls that will detect possible illicit discharge. Staff will inspect one area or 25% of the outfalls annually as well as those discharge points that exhibit possible pllutants during the previous year.
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began mapping historic spill data from year 2000 through 2013. 64 spills were mapped with data including spill site coordinates, city and MEERTS incident number, date and material spilled.
2013
Ongoing BMPs
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sewer televising
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sewer cleaning
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creek crossing inspections
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grease trap inspections
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sewer smoke testing
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box culvert inspections
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spill response
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detention pond inspections
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storm drain cleaning
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floatables inspection
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recycling collection
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household hazardous waste collection
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yard waste collection
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e-waste collection
MCM III - Illicit Discharge Detection and Elimination
Are you aware of an illicit discharge? Let us know! Contact us using the form below or call (573) 364-8659.
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This minimum control measure is closely tied to the continuation of existing or ongoing BMPs such as sewer televising, grease trap inspections, household hazardous waste collection. The BMPs that are in place have been very effective in reducing pollutants and will be continued.
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continued dry weather outfall screenings for illicit discharge
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site inspections of industrial and commercial facilities