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Phosphorus Limit Policy: Discharge Upstream of Impaired Waters

Phosphorus Limit Policy: Discharge Upstream of Impaired Waters. Steven Weiss Research Scientist September 23 rd , 2008. Addressing Phosphorus Discharges Upstream of Impaired Waters. Goal: Limit discharges of phosphorus that may cause or contribute to a water quality impairment. WWTP. Lake.

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Phosphorus Limit Policy: Discharge Upstream of Impaired Waters

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  1. Phosphorus Limit Policy:Discharge Upstream of Impaired Waters Steven Weiss Research Scientist September 23rd, 2008

  2. Addressing Phosphorus Discharges Upstream of Impaired Waters • Goal: Limit discharges of phosphorus that may cause or contribute to a water quality impairment.

  3. WWTP Lake Nonpoint Source Pollution

  4. Causes or Contributes Scheduled to Meet Standards Point Source Limit (WQBEL) Scheduled to Meet Standards Nonpoint Source TMDL Point Source

  5. Point Source 0 kg Limit Not Subject to WQBEL No Reasonable Potential

  6. Yes No (reissuance) Maintain Current Limit Participate in TMDL Process New? Yes No (Expanding) > 1,800 lbs./yr? > 1,800 lbs./yr? Yes No Yes No 1.0 mg/L limit (Brainerd) & if necessary Mass Cap Or Trade 1.0 mg/L limit & Trade (CLRSD) Trade Mass Cap Or Trade TP Limit Protocol: Facilities Upstream of Impaired Waters Is the discharge new or expanding?

  7. 20% permitted load reduction Permitted TP Load (lbs/year) New Facility Seller Total Pre-TMDL Phosphorus Trading • Board Approved Permitting Strategy (June 24th, 2008) • Ratio between buyer and seller insures reduction of permitted mass.

  8. Voluntary Reduction Variability Policy: Permitted vs. Actual 1.2 1 0.8 TP (mg/L) 0.6 0.4 0.2 0 03/05 05/05 07/05 09/05 11/05 01/06 03/06 05/06 07/06 09/06 11/06 01/07 03/07 05/07 07/07 09/07

  9. Summary • If a facility causes or contributes… • WQBEL • If a facility has no reasonable potential… • 1.0 mg/L Concentration Limit • Mass Cap • Pre-TMDL Phosphorus Trading • Permitted Load

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