map the ms4 conveyances locate all outfalls conduct dry weather screening of outfalls develop...
TRANSCRIPT
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MCM 3
Illicit Discharge Detection and Elimination
Howard County Stormwater District
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Overall Strategy
Map the MS4 conveyances
Locate all outfalls
Conduct dry weather screening of outfalls
Develop & enforce an Illicit Discharge Ordinance in the MS4 area
Investigate outfalls with dry weather flow to detect & eliminate illicit discharges in the MS4 area
Provide targeted education about non-stormwater discharges to the storm sewer system
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Overall Strategy
Investigate citizen complaints of illicit discharge in the MS4 area & county-wide stormwater district
Provide leadership & support for addressing large-scale illicit discharge problems
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Map the MS4 Conveyances
In office: IDEM defines MS4 area Identify receiving waters
for NOI Define HUC-14 watersheds
for each receiving water
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Map the MS4 Conveyances
Identify Receiving Waters
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Map the MS4 Conveyances
Receiving Water HUCs in MS4
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Locate All Outfalls
In field: Outfall
ReconnaissanceInventory• Walk or float all
receiving waters looking for outfalls from any size pipe or open drain
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Dry Weather Screening
Document location of all outfalls to designated receiving waters
Conduct dry weather screening of MS4 outfalls
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Water Testing at Flowing Outfalls
In field testing:1. YSI ProPlus handheld
meter with 4 sensors• pH• conductivity• dissolved oxygen• ammonia
2. Samples for lab • E. coli• Atrazine
3. Macroinvertebrate survey for edges of MS4
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E. Coli Testing
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Illicit Discharge Ordinance
Develop and enforce an Illicit Discharge Ordinance in the MS4 area 4 enforcement actions
to date
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Prioritize Flowing Outfalls for Investigation
detect and eliminate illicit discharges To be conducted over the
remaining years in the NPDES permit cycle
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Targeted Education About Illicit Discharges
Ongoing Schools Homeowners Businesses
Media Handouts Door hangars Radio Presentations Displays
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Respond to Citizen Complaints
Anything "discharged" to receiving waters in MS4 or regulated drains in the county
30 complaints submitted to date ongoing
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Provide Leadership and Support for Addressing Large-Scale Problems
Failing septics in neighborhood situations• investigation• organization• funding
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Questions ?