Florida Regulations 62-4.241: Whole Effluent Toxicity Limits
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(1) Facilities subject to whole effluent toxicity testing as identified in subsection 62-620.620(3), F.A.C., shall meet the following whole effluent toxicity limitations unless a mixing zone as specified in paragraphs 62-4.244(3)(a) through (d), F.A.C., or a variance has been approved by the Department.
(a) For acute whole effluent toxicity, the LC50, as defined in subsection 62-302.200(1), F.A.C., shall not be less than 100% effluent; and
(b) For chronic whole effluent toxicity, the IC25, as defined in subsection 62-302.200(14), F.A.C., shall not be less than 100% effluent.
(2) Facilities granted a chronic toxicity mixing zone in accordance with Fl. Admin. Code R. 62-4.244(3)(a), shall meet the following whole effluent toxicity limitations.
(a) For acute whole effluent toxicity, the LC50, as defined in subsection 62-302.200(1), F.A.C., shall not be less than 100% effluent; and
(b) For chronic whole effluent toxicity, the IC25, as defined in subsection 62-302.200(14), F.A.C., shall not be less than the effluent concentration allowed by the mixing zone.
(3) Facilities with high rate dilution permitted under Fl. Admin. Code R. 62-4.244(3)(b), shall meet the following whole effluent toxicity limitations.
(a) For acute whole effluent toxicity, the LC50, as defined in subsection 62-302.200(1), F.A.C., shall not be less than 30% effluent; and
(b) For chronic whole effluent toxicity, the IC25, as defined in subsection 62-302.200(14), F.A.C., shall not be less than 10% effluent.
(4) Facilities permitted as open ocean discharges under Fl. Admin. Code R. 62-4.244(3)(c), shall meet the following whole effluent toxicity limitations.
(a) For acute whole effluent toxicity, the LC50, as defined in subsection 62-302.200(1), F.A.C., shall not be less than 30% effluent; and
(b) For chronic whole effluent toxicity, the IC25, as defined in subsection 62-302.200(14), F.A.C., shall not be less than 10% effluent.
(5) Water Treatment facilities granted a mixing zone for demineralization concentrate in accordance with Fl. Admin. Code R. 62-4.244(3)(d), shall meet the following whole effluent toxicity limitations.
(a) For small water utility businesses, as defined in Section 403.0882(2)(b), F.S., the acute whole effluent toxicity LC50, as defined in subsection 62-302.200(1), F.A.C., shall not be less than 20% effluent. For demineralization concentrate discharges other than small water utility businesses, the LC50 shall not be less than the effluent concentration allowed by the mixing zone and shall not be less than 20% effluent; and,
(b) For small water utility businesses, the chronic whole effluent toxicity IC25, as defined in subsection 62-302.200(14), F.A.C., shall not be less than 20% effluent. For demineralization concentrate discharges other than small water utility businesses, the IC25 shall not be less than the effluent concentration allowed by the mixing zone.
Rulemaking Authority 403.061, 403.087, 403.804, 403.805 FS. Law Implemented 403.021, 403.061, 403.087, 403.088, 403.121, 403.131, 403.141, 403.161 FS. History-New 4-2-08.
(b) For chronic whole effluent toxicity, the IC25, as defined in subsection 62-302.200(14), F.A.C., shall not be less than 100% effluent.
(2) Facilities granted a chronic toxicity mixing zone in accordance with Fl. Admin. Code R. 62-4.244(3)(a), shall meet the following whole effluent toxicity limitations.
(a) For acute whole effluent toxicity, the LC50, as defined in subsection 62-302.200(1), F.A.C., shall not be less than 100% effluent; and
(b) For chronic whole effluent toxicity, the IC25, as defined in subsection 62-302.200(14), F.A.C., shall not be less than the effluent concentration allowed by the mixing zone.
(3) Facilities with high rate dilution permitted under Fl. Admin. Code R. 62-4.244(3)(b), shall meet the following whole effluent toxicity limitations.
(a) For acute whole effluent toxicity, the LC50, as defined in subsection 62-302.200(1), F.A.C., shall not be less than 30% effluent; and
(b) For chronic whole effluent toxicity, the IC25, as defined in subsection 62-302.200(14), F.A.C., shall not be less than 10% effluent.
(4) Facilities permitted as open ocean discharges under Fl. Admin. Code R. 62-4.244(3)(c), shall meet the following whole effluent toxicity limitations.
(a) For acute whole effluent toxicity, the LC50, as defined in subsection 62-302.200(1), F.A.C., shall not be less than 30% effluent; and
(b) For chronic whole effluent toxicity, the IC25, as defined in subsection 62-302.200(14), F.A.C., shall not be less than 10% effluent.
(5) Water Treatment facilities granted a mixing zone for demineralization concentrate in accordance with Fl. Admin. Code R. 62-4.244(3)(d), shall meet the following whole effluent toxicity limitations.
(a) For small water utility businesses, as defined in Section 403.0882(2)(b), F.S., the acute whole effluent toxicity LC50, as defined in subsection 62-302.200(1), F.A.C., shall not be less than 20% effluent. For demineralization concentrate discharges other than small water utility businesses, the LC50 shall not be less than the effluent concentration allowed by the mixing zone and shall not be less than 20% effluent; and,
(b) For small water utility businesses, the chronic whole effluent toxicity IC25, as defined in subsection 62-302.200(14), F.A.C., shall not be less than 20% effluent. For demineralization concentrate discharges other than small water utility businesses, the IC25 shall not be less than the effluent concentration allowed by the mixing zone.
Rulemaking Authority 403.061, 403.087, 403.804, 403.805 FS. Law Implemented 403.021, 403.061, 403.087, 403.088, 403.121, 403.131, 403.141, 403.161 FS. History-New 4-2-08.