Middle St. Johns - Florida Department of Environmental Protection

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178 Water Quality Assessment Report: Middle St. Johns Table 4.5 (contnued) WBID Waterbody Segment Waterbody Type Total Nitrogen and Total Phosphorus Median 1 (mg/L) 3004D Silver Lake Lake TN = 0.64 mg/L TP = 0.03 mg/L 3004G Bay Lake Lake (TN = 1.21 mg/L) TP =0.04 mg/L Nitrogen to Phosphorus Ratio Median 2 Limiting Nutrient(s) 27 (118 values) N and P colimitation 31 (286 values) Colimitation based on data of planning period and P limitation based on data of verified period 3009 Bear Gulley Lake Lake TP = 0.04 mg/L 30 (66 values) P limitation 1 TN and TP medians are for the entire sets of TN and TP concentrations retrieved from IWR database. 2 TN to TP ratio medians are for the subset of TN and TP concentrations that paired TN and TP measurements are available. N = Nitrogen P = Phosphorus TN = Total nitrogen TP = Total phosphorus As required by the IWR, the Department must identify the pollutants causing or contributing to DO exceedances to confirm impairment and place the waterbody on the Verified List. If a water segment is on the Verified List for both DO and nutrients, then nutrients is identified as a pollutant contributing to DO exceedances. The Department also applies the following analysis to identify the pollutant(s) contributing to DO exceedances: The water segment median values for biological oxygen demand (BOD), TN, and TP are determined for the verified period (i.e., January 1995 to January 2002). 1. The median values are then compared with the screening levels for the appropriate waterbody type. The screening levels represent the 70th percentile value of data collected from streams, lakes, or estuaries (Table 4.6). 2. If a water segment median value exceeds the screening level, the parameter is identified as a pollutant contributing to the exceedances. Table 4.6: Screening Level Values (70th Percentile) Based on STORET Data from 1970 to 1987 BOD (mg/L) TN (mg/L) TP (mg/L) Streams 2.0 1.6 0.22 Lakes 2.9 1.7 0.11 Estuaries 2.1 1.0 0.19 Source: Friedemann, F., and J. Hand, 1989.
Water Quality Assessment Report: Middle St. Johns 179 Table 4.7 provides causative factors of DO impairment, status of annual average chlorophyll a concentration (if a stream was identified as being impaired by the nutrient as well as DO), status of annual average Trophic State Index (TSI) (if a lake was identified as being impaired by the nutrient as well as DO), BOD5 median (if exceeded the screening level), or TN and/or TP medians (if a given water segment was not identified as being impaired by nutrient based on the annual chlorophyll a concentration or annual TSI, but TN and/or TP exceeded the screening level). A water segment has to have a sufficient number of DO exceedances and a causative factor to be placed on the Verified List. If a water has a sufficient number of exceedances for placement on the Verified List but does not have an identified causative factor, the DO for that segment is included on the Planning List. Table 4.7: Middle St. Johns Basin Median Values for the Verified Period WBID 2893A2 2893D (Called 2893D [and 2893C] on 1998 303[d] List) 2893E 2893F Waterbody Segment St. Johns River Above Lake George Lake Monroe St. Johns River Above Lake Monroe St. Johns River Above Lake Jesup 2962 Smith Canal 2964A Lake Harney 2973 DeForest Lake Outlet 2985 Chub Creek Waterbody Type Causative Factor Identified BOD 5 Day Median (mg/L) Annual Mean Chlorophyll a (µg/L) Stream Nutrients — Exceeded 20 Annual Mean TSI Lake Nutrients — — Exceeded 60 Stream Nutrients — Exceeded 20 Stream Nutrients — Exceeded 20 Total Nitrogen Median (mg/L) — — — — — — — — — — — Stream BOD 2.1 — — — — Lake Nutrients — — Exceeded 60 — — Stream BOD 3.8 — — — — Stream Nitrogen Phosphorus — — — 2.3 0.37 2990 Salt Creek Stream Nitrogen — — — 1.71 — Total Phosphorus Median (mg/L)
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Middle St. Johns - Florida Department of Environmental Protection

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