Presentation on theme: "Water Treatment Plant General Discharge Permit"— Presentation transcript:
1Water Treatment Plant General Discharge Permit Kelli D. Buscher, P.E.SD DENR
2Clean Water Act Background Clean Water Act established the National Pollutant Discharge Elimination System (NPDES) Program
3Clean Water Act Background All “Point Sources”“discharging pollutants”into “waters of the US”must obtain a discharge permit
4Clean Water Act Background A discharge permit is required to use public resources for waste disposal and limits the amount of pollutants that may be dischargedThe discharge of pollutants to waters is a privilege, not a right
5Clean Water Act Background All “waters of the state” have water quality standardsA 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
6Beneficial 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;
7Beneficial 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.
8What 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
9Why a General Permit?Ensure all discharges from water treatment systems are coveredEstablish uniform criteria for discharges from these activitiesReduce the administrative time for permit authorizationFacilitate the scheduling of activities by reducing the administrative time for permit authorization;Establish uniform criteria for management practices and effluent limits for discharges from these activities; andMore consistent permitting and enforcement with respect to these discharges.
10What is NOT Covered? If the discharge contains radioactive components If the discharge is to a lake or POTWIf the discharge is a significant contributor of pollutionIf the discharge presents a health hazardIf the discharge is not in compliance
11What is NOT Covered?If EPA develops federal limits for water treatment plant dischargesIf a water quality management plan containing requirements applicable to the discharges is approvedIf conditions or standards have changed so that the discharge no longer qualifies for the general permit.
12Prohibitions No discharge of sanitary wastewater No direct discharge of solids and/or sludgesNo discharge of floating solids or visible foamNo discharge of toxic pollutants in toxic amountsSDDENR must be notified in advance of all chemicals usedPrevent or minimize stream scouring or bank erosion caused by the discharge
13Limits pH 6.5-9.0 for most discharges for coldwater marginal fisheriesfor coldwater permanent fisheries
14Limits Total Suspended Solids Total Dissolved Solids 90 mg/L for most 30 mg/L for coldwater permanent fisheriesTotal Dissolved Solids2,500 mg/L for most1,000 mg/L for domestic water supplies
15Limits Conductivity Chlorinated water Chloraminated water 2,500 μmhos/cmChlorinated water0.05 mg/L Total Residual ChlorineChloraminated water1.0 mg/L Ammonia
16Outfalls DW1 Raw or partially treated water from the treatment system Lime softening pondsFilter backwashOverflows from treatment unitsRaw water
17OutfallsDW2Completely treated water from treatment, storage, or distributionStorage system overflowsWater line breaksHydrant flushingHydrostatic testingDisinfection of new lines
20Best Management Practices Permit requires the development of a BMP planDescribe what will be done to reduce pollution from temporary discharges such as overflows and line flushing
21Representative Outfalls Representative outfalls cover activities at similar sitesSampling would only have to be performed at selected outfallsProvide documentation showing that the discharges from these activities will be similar in quality and nature
22Frequently 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?
23Frequently 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?
24For more information Kelli Buscher Anthony Mueske Anthony Mueske