Substantive revisions to the rule include: 1) new text providing a different assessment methodology for exceedances of water quality criteria for synthetic organics and pesticides, 2) new text allowing the Department to use data older than ten years if it can be demonstrated to be representative of current conditions, 3) revisions to provisions related to sample representativeness, including changing the averaging period from seven to four days and deleting the requirement for data from three different seasons, 4) new text providing an assessment methodology for the daily average Dissolved Oxygen criterion for predominantly marine waters, 5) changing the requirements for data quality assessment elements to better track the requirements of Chapter 62-160, F.A.C., 6) deletion of the provisions related to assessment of toxicity test data, 7) new text describing how annual average chlorophyll a and Trophic State Index values will be calculated, 8) new text providing an assessment methodology for monthly average coliform water quality criteria, 9) revisions to the provisions related to assessment of shellfish harvesting classification information, and 10) new text allowing the Department to waive the minimum sample size requirement if the data provide overwhelming evidence of impairment.