Water Treatment Plant General Discharge Permit Kelli D. Buscher, P.E. SD DENR.
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Transcript of Water Treatment Plant General Discharge Permit Kelli D. Buscher, P.E. SD DENR.
Clean Water Act Background
1972 - Clean Water Act established the National Pollutant Discharge Elimination System (NPDES) Program
Clean Water Act Background
All “Point Sources”“discharging pollutants”into “waters of the US”must obtain a discharge permit
Clean Water Act Background
A discharge permit is required to use public resources for waste disposal and limits the amount of pollutants that may be discharged
The discharge of pollutants to waters is a privilege, not a right
Clean Water Act Background
All “waters of the state” have water quality standards
A water quality standard defines the water quality goal of a water body by designating the beneficial use or uses of the water body and by setting criteria necessary to protect those uses
Beneficial Uses
(1) Domestic Water Supply Waters;
(2) Coldwater Permanent Fish Life Propagation;
(3) Coldwater Marginal Fish Life Propagation;
(4) Warmwater Permanent Fish Life Propagation;
(5) Warmwater Semipermanent Fish Life Propagation;
(6) Warmwater Marginal Fish Life Propagation;
Beneficial Uses
(7) Immersion Recreation Waters;(8) Limited Contact Recreation Waters;
(9) Fish and Wildlife Propagation, Recreation, and Stock Watering Waters;
(10) Irrigation waters; and
(11) Commerce and Industry Waters.
What Needs to be Covered?
Treatment system overflowsFilter Backwash and Settling BasinsDisinfection and Flushing of Water LinesStorage system disinfection and
overflowsWater line breaksOther WTP Discharges that fit the limits
and management practices
Why a General Permit?
Ensure all discharges from water treatment systems are covered
Establish uniform criteria for discharges from these activities
Reduce the administrative time for permit authorization
What is NOT Covered?
If the discharge contains radioactive components
If the discharge is to a lake or POTW If the discharge is a significant
contributor of pollution If the discharge presents a health
hazard If the discharge is not in compliance
What is NOT Covered?
If EPA develops federal limits for water treatment plant discharges
If a water quality management plan containing requirements applicable to the discharges is approved
If conditions or standards have changed so that the discharge no longer qualifies for the general permit.
Prohibitions
No discharge of sanitary wastewater No direct discharge of solids and/or sludges No discharge of floating solids or visible
foam No discharge of toxic pollutants in toxic
amounts SDDENR must be notified in advance of all
chemicals used Prevent or minimize stream scouring or bank
erosion caused by the discharge
Limits
pH6.5-9.0 for most discharges6.5-8.8 for coldwater marginal fisheries6.6-8.6 for coldwater permanent fisheries
Limits
Total Suspended Solids90 mg/L for most30 mg/L for coldwater permanent fisheries
Total Dissolved Solids2,500 mg/L for most1,000 mg/L for domestic water supplies
Limits
Conductivity2,500 μmhos/cm
Chlorinated water0.05 mg/L Total Residual Chlorine
Chloraminated water0.05 mg/L Total Residual Chlorine1.0 mg/L Ammonia
Outfalls
DW1Raw or partially treated water from the
treatment systemLime softening pondsFilter backwashOverflows from treatment unitsRaw water
Outfalls
DW2Completely treated water from treatment,
storage, or distributionStorage system overflowsWater line breaksHydrant flushingHydrostatic testingDisinfection of new lines
Monitoring Requirements
Outfall DW1 Flow Duration of
Discharge pH Temperature Total Fluoride Sulfates
TSS TDS TRC (if chlorinating) Ammonia (if
chloraminating) Conductivity Alkalinity
Monitoring Requirements
Outfall DW2 Total Flow Duration of
Discharge pH
TSS TRC (if chlorinating) Ammonia (if
chloraminating)
Best Management Practices
Permit requires the development of a BMP plan
Describe what will be done to reduce pollution from temporary discharges such as overflows and line flushing
Representative Outfalls
Representative outfalls cover activities at similar sites
Sampling would only have to be performed at selected outfalls
Provide documentation showing that the discharges from these activities will be similar in quality and nature
Frequently Asked Questions
Are all water systems required to get coverage under the discharge permit?
Do all water systems need coverage under both outfalls?
How is the state going to handle chlorine for discharges into road ditches?
What if we can not get a sample during a discharge?
Frequently Asked Questions
The permit requires that no chemicals be added without DENR notification. How will that work?
Can we use chemicals for dechlorination? Why would I want coverage under this
permit instead of the temporary one? What are the next steps?
For more information
Kelli Buscher [email protected] 605.773.3351
Anthony [email protected]
http://www.state.sd.us/denr/DES/Surfacewater/WTP.htm