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Implementation of RPA at the Cambria DMO
When?
In non-TMDL watersheds.
In TMDL watersheds where a WLA is not available.
3 Step RPA process.
RP (RPA screening). PADEP TGD 563-2112-115, June 2013
RPA determination using mass balance equation.
PADEP TGD 563-2112-115, June 2013 EPA NPDES Permit Writers’ Manual, September 2010
Development of effluent limits using WQSS or PENTOXSD.
Choosing Variables
Flow
Discharge New permit applications Average flow rate Permit renewal applications 95th percentile low flow rate
Stream Q7-10 flow rate
Concentration
Average Concentration Utilized for the vast majority (> 95%) of RPA calculations.
Maximum Concentration Can be utilized in special circumstances for emphasis. Sensitive watersheds.
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