The Department proposes to amend Chapter 62-302, F.A.C., to: (1) revise several definitions used in Chapter 62-302, F.A.C., (2) correct several typographical errors in Chapter 62-302, F.A.C., (3) clarify how surface water quality criteria are applied, (4) update a number of surface water quality criteria based on updated science, (5) correct outdated rule references in Chapter 62-302, F.A.C., (6) allow for the use of Ekman and Ponar dredges for determining the Shannon-Weaver Diversity Index, (7) establish numeric nutrient criteria for the Tidal Peace River estuary, and (8) revise the criteria for DO in both fresh and marine waters. OTHER RULES INCORPORATING THIS RULE: Chapter 62-302, F.A.C., is referenced by the following rules: 18-2.021, 62-4.160, 62-4.241, 62-4.242, 62-4.244, 62-4.246, 62-25.001, 62-25.025, 62-25.080, 62-40.120, 62-40.210, 62-45.070, 62-45.170, 62-110.106, 62-113.200, 62-301.100, 62-302.200, 62-302.300, 62-302.400, 62-302.500, 62-302.520, 62-302.530, 62-302.531, 62-302.532, 62-302.540, 62-302.700, 62-302.800, 62-303.100, 62-303.200, 62-303.320, 62-303.330, 62-303.351, 62-303.352, 62-303.353, 62-303.354, 62-303.370, 62-303.390, 62-303.400, 62-303.430, 62-303.450, 62-303.720, 62-304.310, 62-304.335, 62-312.400, 62-330.100, 62-330.200, 62-330.405, 62-330.410, 62-330.412, 62-330.630, 62-340.700, 62-346.050, 62-346.051, 62-346.301, 62-348.200, 62-520.200, 62-520.520, 62-528.610, 62-528.630, 62-600.120. 62-600.200, 62-600.300, 62-600.400, 62-600.430, 62-600.440, 62-600.500, 62-600.520, 62-610.200, 62-610.300, 62-610.310, 62-610.554, 62-610.555, 62-610.650, 62-610.670, 62-610.810, 62-610.820, 62-610.830, 62-610.850, 62-610.860, 62-611.110, 62-611.200, 62-611.450, 62-611.500, 62-611.600, 62-611.650, 62-611.700, 62-620.320, 62-620.620, 62-621.303, 62-624.800, 62-625.400, 62-640.400, 62-650.300, 62-660.300, 62-673.340, 62-673.610, 62-701.200, 62-709.500, 62-711.540, 62-761.200, 62-762.201, 62-770.200, 62-771.100, 62-777.150, 62-777.170, 62-780.200, 62-782.200, 62-785.200, 62B-49.008, 62B-49.012, 62C-16.0051, F.A.C. Rule 62-302.200, F.A.C., is referenced by the following rules: 62-4.241, 62-302.200, 62-302.530, 62-302.531, 62-302.540, 62-303.351, 62-303.390, 62-348.200, 62-520.200, 62-611.500, 62-620.620, 62-621.303, 62-777.170, 62C-16.0051, F.A.C. Rule 62-302.400, F.A.C., is referenced by the following rules: 62-4.242, 62-40.210, 62-302.400, 62-302.530, 62-330.410, 62-330.412, 62-611.110, F.A.C. Rule 62-302.500, F.A.C., is referenced by the following rules: 62-4.160, 62-4.244, 62-25.030, 62-302.200, 62-302.400, 62-302.500, 62-302.530, 62-302.800, 62-303.400, 62-600.120, 62-611.500, 62-611.650, 62-620.610, 62-621.303, F.A.C. Rule 62-302.530, F.A.C., is referenced by the following rules: 62-4.244, 62-302.200, 62-302.400, 62-302.500, 62-302.530, 62-302.531, 62-302.532, 62-302.800, 62-303.200, 62-303.320, 62-303.330, 62-303.370, 62-303.430, 62-303.450, 62-303.720, 62-611.500, 62-611.600, 62B-49.008, F.A.C. Rule 62-302.532, F.A.C., is referenced by the following rules: 62-302.531, 62-302.532, 62-303.450, F.A.C. EFFECT ON THOSE OTHER RULES: The proposed amendments will change the dissolved oxygen criteria that industry, local government, agriculture and other surface water dischargers must meet. The remainder of the amendments will have minimal impact on the other rules of the Department.