1. (a) Subject to the criteria in Env-Wq 1703.14, Env-Wq 1703.25 through 1703.33, and the procedure in Env-Wq 1704.03(b), the following shall be acceptable procedures for determining alternative site-specific nutrient criteria:

   1. (1) Adopting the nutrient target concentration or load from an EPA approved total maximum daily load (TMDL) study pursuant to 40 CFR 130.7;
   2. (2) Adopting the nutrient target concentration or load from an advance restoration plan;

   3. (3) Adopting one of the following federal requirements:

      1. a. Criteria published by EPA pursuant to 33 U.S.C. 1314(a)(1); or
      2. b. The ambient targets and commensurate flows applied in permits issued pursuant to 40 CFR 122;
   4. (4) Approaches in the “Nutrient Criteria Technical Guidance Manual Rivers and Streams”, EPA-822-B-00-002 dated July 2000, available as noted in Appendix B;
   5. (5) Approaches in the “Nutrient Criteria Technical Guidance Manual Lakes and Reservoirs”, EPA-822-B00-001 dated April 2000, available as noted in Appendix B;
   6. (6) Approaches in the “Nutrient Criteria Technical Guidance Manual Estuary and Coastal Marine Waters”, EPA-822-B01-003 dated October 2001, available as noted in Appendix B;
   7. (7) Approaches in the “Nutrient Criteria Technical Guidance Manual Wetlands”, EPA-822-B-08-001 dated June 2008, available as noted in Appendix B; and
   8. (8) Approaches in “Using Stressor-response Relationships to Derive Numeric Nutrient Criteria”, EPA-820-S-10-001 dated November 2010, available as noted in Appendix B.
2. (b) Modeling conducted to determine alternative site-specific nutrient criteria shall be conducted as specified in EPA’s “Guidance on the Development, Evaluation, and Application of Environmental Models”, EPA-100-K-09-003 dated March 2009, available as noted in Appendix B

Source. #14203, eff 2-26-25