# FLORIDA DEPARTMENT OF ENVIRONMENTAL PROTECTION

Division of Water Resource Management, Bureau of Watershed Management



## NORTHEAST DISTRICT • UPPER EAST COAST BASIN 

# Final TMDL Report 

# Dissolved Oxygen and Nutrient TMDL for Spruce Creek, WBID 2674A

Wayne Magley, Ph.D., P.E.

April 2008Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



# Acknowledgments

Editorial assistance provided by: Jan Mandrup-Poulsen and Linda Lord. Geographic information assistance (GIS) provided by: Janis Paulsen and Latrincy Whitehurst. For additional information on the watershed management approach and impaired waters in the Upper East Coast Basin, contact: Jennifer Gihring Florida Department of Environmental Protection Bureau of Watershed Management Watershed Planning and Coordination Section 2600 Blair Stone Road, Mail Station 3565 Tallahassee, FL 32399-2400 Email: jennifer.gihring@dep.state.fl.us Phone: (850) 245–8418 Fax: (850) 245–8434 Access to all data used in the development of this report can be obtained by contacting: Wayne Magley Florida Department of Environmental Protection Bureau of Watershed Management Watershed Assessment Section 2600 Blair Stone Road, Mail Station 3555 Tallahassee, FL 32399-2400 Email: wayne.magley@dep.state.fl.us Phone: (850) 245–8463 Fax: (850) 245–8444

Florida Department of Environmental Protection iiFinal TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



# Contents

Chapter 1: INTRODUCTION___________________________________1 1.1 Purpose of Report ______________________________________________1 1.2 Identification of Waterbody_______________________________________1 1.3 Background ___________________________________________________5 

# Chapter 2: DESCRIPTION OF WATER QUALITY PROBLEM ________6 2.1 Statutory Requirements a nd Rulemaking History ____________________6 2.2 Information on Veri fied Impairment ________________________________6 

# Chapter 3. DESCRIPTION OF APPLICABLE WATER QUALITY STANDARDS AND TARGETS _______________________9 3.1 Classification of the Wa terbody and Criteria App licable to the TMDL ____9 3.2 Applicable Water Quality Standards and Numeric Water Quality Target_________________________________________________________9 3.2.1 Dissolved Oxy gen Criterion __________________________________9 

# Chapter 4: ASSESSMENT OF SOURCES_______________________11 4.1 Types of Sources ______________________________________________11 4.2 Potential Sources of Nutrients in the Spruce Creek Watershed ________11 4.2.1 Point Sources _____________________________________________11 4.2.2 Land Uses and Nonpoint Sources _____________________________13 4.3 Source Summary ______________________________________________22 4.3.1 Summary of Nutrient Loadings to Spruce Creek from Various Sources __________________________________________________22 

# Chapter 5: DETERMINATION OF ASSIMILATIVE CAPACITY_______25 5.1 Determination of Loading Capacity________________________________25 5.1.1 Data Used in the Dete rmination of the TMDL_____________________26 5.1.2 TMDL Development Process _________________________________32 5.1.3 Critical Condit ions/Seasonality ________________________________39 

# Chapter 6: DETERMINATION OF THE TMDL ____________________41 6.1 Expression and Allocat ion of the TMDL ___________________________41 6.2 Load Allocation _______________________________________________42 6.3 Wasteload Allocation___________________________________________42 6.3.1 NPDES Wastewater Discharges ______________________________42 6.3.2 NPDES Stormwater Discharges_______________________________42

Florida Department of Environmental Protection iiiFinal TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



## 6.4 Margin of Safety _______________________________________________42 

# Chapter 7: NEXT STEPS: IMPLEMENTATION PLAN DEVELOPMENT AND BEYOND _____________________43 7.1 Basin Management Action Plan __________________________________43 

# References _______________________________________________44 Appendices _______________________________________________45 Appendix A: Background Information on Federal and State Stormwater Programs_____________________________________________________45 Appendix B: Historical DO, Corrected Chla, TN, and TP Observations in Spruce Creek, 1991–2006 _______________________________________46 Appendix C: Kruskal–Wallis Analysis of DO, DOSAT, Corrected Chla, TN, and TP Observations versus Season in Spruce Creek ____________60 Appendix D: Kruskal–Wallis Analysis of DO, DOSAT, Corrected Chla, TN, and TP Observations versus Month in Spruce Creek _____________62 Appendix E: Chart of DO, DOSA T, Corrected Chla, TN, and TP Observations by Season, Station, and Year in Spruce Creek __________65 Appendix F: Chart of Rainfall fo r Daytona International Airport, 1948– 2006 _________________________________________________________75 Appendix G: Spearman Correlation Ma trix Analysis for Water Quality Parameters in Spruce Creek _____________________________________76 Appendix H: Linear Regression Analysis of DO and Corrected Chla Observations versus Nutrients and BOD in Spruce Creek ____________80 Appendix I: Monthly a nd Annual Precipitation at Daytona International Airport, 1948–2006 _____________________________________________85 Appendix J: Annual and Monthly Average Precipitation at Daytona International Airport ____________________________________________87 Appendix K: Response to Comment s Following the January 15, 2008 Public Meeting ________________________________________________88

Florida Department of Environmental Protection ivFinal TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



# List of Tables

Table 2.1. Summary of DO Data by M onth for the Verified Period (January 1, 1999 – June 30, 2006) _____________________________7 Table 2.2. Summary of DO Data by Season for the Verified Period (January 1, 1999 – June 30, 2006) _____________________________7 Table 2.3. Summary of DO Data by Year for the Verified Period (January 1, 1999 – June 30, 2006) _____________________________7 Table 2.4. Summary of Annual Average Corrected Chla for the Verified Period (January 1, 1999 – June 30, 2006) _________________8 Table 4.1. Classification of Land Use Categories in the Spruce Creek Watershed _______________________________________________14 Table 4.2. Description of Hydrologic So il Classes from the SSURGO Database ________________________________________________17 Table 4.3. Estimated Average Household Si ze in the Spruce Creek Watershed _______________________________________________21 Table 4.4. Estimated Nitrogen and Phosph orus Annual Loading from Septic Tanks in the Spruce Creek Watershed ____________________21 Table 4.5. Estimated Loading from Wastew ater Collection Systems in the Spruce Creek Watershed_______________________________21 Table 4.6. Estimated Annual Average TN and TP Loads from Agriculture in the Spruce Creek Watershed______________________22 Table 4.7. Estimated Urban and Built -up Annual Nitrogen and Phosphorus Loading in the Spruce Creek Watershed______________23 Table 4.8. Estimated Annual Nitrogen and Phosphorus Loading to WBID 2674A from WBID 2674, 1991–2005______________________23 Table 4.9. Summary of Estimated Potential Annual Nitrogen and Phosphorus Loading from Various Sources in the Spruce Creek Watershed __________________________________________24 Table 5.1. Physical and Statistical Summaries for USGS Gaging Sites in the Spruce Creek Watershed __________________________26 Table 5.2. Sampling Station Summary for the Spruce Creek Watershed _______________________________________________27 Table 5.3. Statistical Summary of Historical Data for Spruce Creek____________28 Table 5.4. Calculation of TP Reductions for the DO TMDL for Spruce Creek ___________________________________________________35 Table 5.5. Calculation of BOD Reductions for the DO TMDL for Spruce Creek _____________________________________________39 Table 5.6. Monthly and Seasonal Exceedance Rates for DO_________________40 Table 6.1. TMDL Components for Spruce Creek __________________________42

Florida Department of Environmental Protection vFinal TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



# List of Figures Figure 1.1. Location of Spruce Creek and Major Geopolitical Features in the Upper East Coast Basin_________________________________2 Figure 1.2. Spruce Creek, WBID 2674A __________________________________3 Figure 1.3. WBIDs in the Halifax River Planning Unit ________________________4 Figure 4.1. Location of Permitted Facilities in the Spruce Creek Watershed _______________________________________________12 Figure 4.2. Jurisdictional Areas of Phase II NPDES MS4 Permits in the Spruce Creek Watershed_________________________________13 Figure 4.3. Principal Land Uses in the Spruce Creek Watershed ______________16 Figure 4.4. Hydrologic Soil Groups Distri bution in the Spruce Creek Watershed _______________________________________________18 Figure 5.1. Daily Discharge Recorded at USGS Gage 02248053: Spruce Creek Near New Smyrna Beach ________________________25 Figure 5.2. Historical Sampling Sites in the Spruce Creek Watershed __________29 Figure 5.3. Historical DO Observations for Spruce Creek ____________________30 Figure 5.4. Historical Corrected Chla Observations for Spruce Creek___________30 Figure 5.5. Historical TN Observations for Spruce Creek ____________________31 Figure 5.6. Historical TP Observations for Spruce Creek ____________________31 Figure 5.7. Relationship Between DO and TP Observations for Spruce Creek _____________________________________________33 Figure 5.8. Relationship Between DO and BOD Observations for Spruce Creek _____________________________________________34

Florida Department of Environmental Protection viFinal TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



### Florida Department of Environmental Protection vii 

# Websites Florida Department of Environmental Protection, Bureau of Watershed Management

TMDL Program http://www.dep.state.fl.us/water/tmdl/index.htm Identification of Impaired Surface Waters Rule http://www.dep.state.fl.us/wa ter/tmdl/docs/AmendedIWR.pdf STORET Program http://www.dep.state.fl.us/water/storet/index.htm 2006 305(b) Report http://www.dep.state.fl.us/water/ tmdl/docs/2006_Integrated_Report.pdf Criteria for Surface Wate r Quality Classifications http://www.dep.state.fl.u s/water/wqssp/classes.htm Basin Status Report for the Upper East Coast Basin http://www.dep.state.fl.us/wate r/basin411/uppereast/status.htm 

# U.S. Environmental Protection Ag ency, National STORET Program

http://www.epa.gov/storet/Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



# Chapter 1: INTRODUCTION

1.1 Purpose of Report This report presents the Total Maximum Daily Load (TMDL) for dissolved oxygen (DO) and nutrients for Spruce Creek in the Halifax River Planning Unit of the Upper East Coast Basin. The creek was verified as impaired for both DO and nutrients, and was included on the Verified List of impaired waters for the Upper East Coast Basin that was adopted by Secretarial Order in December 2007. This TMDL establishes the allowable loadings to Spruce Creek that would restore the waterbody so that it meets its applicable water quality criteria for both DO and nutrients. 

## 1.2 Identification of Waterbody Spruce Creek is located in Volusia County, in east-central Florida, near New Smyrna Beach. It forms in wetlands west of New Smyrna Beach and flows north, then turns east and discharges to the Intracoastal Waterway (ICWW) ( Figures 1.1 and 1.2 ). Spruce Creek is approximately 20.1 miles long and is a second-order stream that is tidally influenced in its lower reaches. Additional information about the creek’s hydrology and geology are available in the Basin Status Report for the Upper East Coast Basin (Flo rida Department of Environmental Protection [Department], 2005). Spruce Creek and certain tributaries were designated as Outstanding Florida Waters (OFWs) in 1991. Volusia County initiated a study in May 1994 to evaluate the impact of stormwater on overall water quantity and water quality in the designated OFW areas of Spruce Creek and Rose Bay (Volusia County, 1996). OFW provisions require 50 percent greater treatment for the direct discharge of stormwater to an OFW. Volusia County is currently working on an update to the Spruce Creek/Rose Bay master plan. For assessment purposes, the Department has divided the Upper East Coast Basin into water assessment polygons with a unique w ater b ody id entification (WBID) number for each watershed or stream reach. Spruce Creek consists of two segments, WBIDs 2674 and 2674A, as shown in Figure 1.1 ; this TMDL addresses the DO and nutrient impairments in WBID 2674A. The combined drainage area of WBIDs 2674 (17.67 square miles) and 2674A (13.10 square miles) is 30.77 square miles. Note that the USGS gaging site on Spruce Creek (Gage 02248053) discussed in Chapter 5 has a drainage area of 60.7 square miles and represents additional contributions outside these two WBIDs. Spruce Creek is part of the Halifax River Planning Unit. Planning units are groups of smaller watersheds (WBIDs) that are part of a larger basin unit, in this case the Upper East Coast Basin. The Halifax River Planning Unit consists of 53 WBIDs. Figure 1.3 shows the locations of these WBIDs, Spruce Creek’s location in the planning unit, and a list of the other WBIDs in the planning unit. Since both WBIDs are listed as Spruce Creek, for clarity a number of the figures refer to WBID 2674A as Spruce Creek North.

Florida Department of Environmental Protection 1Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



### Figure 1.1. Location of Spruce Creek and Major Geopolitical Features in the Upper East Coast Basin

Florida Department of Environmental Protection 2Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



### Figure 1.2. Spruce Creek, WBID 2674A

Florida Department of Environmental Protection 3Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



### Figure 1.3. WBIDs in the Halifax River Planning Unit

Florida Department of Environmental Protection 4Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



## 1.3 Background This report was developed as part of the Department’s watershed management approach for restoring and protecting state waters and addressing TMDL Program requirements. The watershed approach, which is implemented using a cyclical management process that rotates through the state’s 52 river basins over a 5-year cycle, provides a framework for implementing the TMDL Program–related requirements of the 1972 federal Clean Water Act and the 1999 Florida Watershed Restoration Act (FWRA) (Chapter 99-223, Laws of Florida). A TMDL represents the maximum amount of a given pollutant that a waterbody can assimilate and still meet water quality standards, including its applicable water quality criteria and its designated uses. TMDLs are developed for waterbodies that are verified as not meeting their water quality standards. They provide important water quality restoration goals that will guide restoration activities. This TMDL Report will be followed by the development and implementation of a Basin Management Action Plan, or BMAP, to reduce the amount of nutrients that caused the verified impairment of Spruce Creek. These activities will depend heavily on the active participation of the St. Johns River Water Management District (SJRWMD), Volusia County, local governments, local businesses, and other stakeholders. The Department will work with these organizations and individuals to undertake or continue reductions in the discharge of pollutants and achieve the established TMDLs for impaired waterbodies.

Florida Department of Environmental Protection 5Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



# Chapter 2: DESCRIPTION OF WATER QUALITY PROBLEM

2.1 Statutory Requirement s and Rulemaking History Section 303(d) of the federal Clean Water Act requires states to submit to the U.S. Environmental Protection Agency (EPA) a list of surface waters that do not meet applicable water quality standards (impaired waters) and establish a TMDL for each pollutant causing impairment of these waters on a schedule. The Department has developed such lists, commonly referred to as 303(d) lists, since 1992. The list of impaired waters in each basin, referred to as the Verified List, is also required by the FWRA (Subsection 403.067[4], Florida Statutes [F.S.]), and the state’s 303(d) list is amended annually to include basin updates. Florida’s 1998 303(d) list included 15 waterbodies and 50 parameters in the Upper East Coast Basin. However, the FWRA (Section 403.067, F.S.) stated that all previous Florida 303(d) lists were for planning purposes only and directed the Department to develop, and adopt by rule, a new science-based methodology to identify impaired waters. After a long rule-making process, the Environmental Regulation Commission adopted the new methodology as Rule 62-303, Florida Administrative Code (F.A.C.) (Identification of Impaired Surface Waters Rule, or IWR), in April 2001; the rule was revised in 2006 and 2007.



## 2.2 Information on Ve rified Impairment The Department used the IWR to assess water quality impairments in Spruce Creek and has verified that the creek is impaired for DO and nutrients, based on data in the Department’s IWR database. Tables 2.1 through 2.3 summarize the DO data for the verification period, which for Group 5 waters was January 1, 1999, through June 30, 2006, by month, season, and year, respectively. There is a 23.4 percent overall exceedance rate for DO in Spruce Creek during the verified period. Exceedances occur in all seas ons and in all months except March ( Tables 2.1 and 2.2 ). During the verified period, samples ranged from 0.01 to 9.20 milligrams per liter (mg/L). As DO solubility is influenced by both salinity and water temperature, ranges in DO saturation were also evaluated. DO saturation ranged from 0.1 to 120.9 percent, with fewer than 10 percent of the saturation values greater than 100 percent. Fewer than 10 percent of the DO saturation values were less than 34 percent. When aggregating data by season, the lowest percentage of exceedances occurred in the winter and the highest in spring. Possible relationships between DO and other water quality parameters will be further assessed using the complete historical dataset in Chapter 5. Of the 17 sites with historical data, 10 were sampled during the verified period. Section 5.1 discusses the sampling stations further.

Florida Department of Environmental Protection 6Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



### Table 2.1. Summary of DO Data by Month for the Verified Period (January 1, 1999 – June 30, 2006)

Month N Minimum Maximum Median Mean No. of Exceedances % Exceedance Mean Precipitation January 11 2.43 8.72 6. 64 5.70 4 36.36% 2.51 February 21 0.01 8.97 5. 73 5.75 3 14.29% 2.89

March 12 1.83 9.2 7. 13 6.78 1 8.33% 3.61 April 15 4.13 7.72 6. 38 6.03 0 0.00% 2.35 May 15 0.53 7.18 4.92 4.19 6 40.00% 2.86 June 17 0.95 7.1 3.76 4.11 9 52.94% 6.15 July 7 0.79 6.03 4. 10 3.96 2 28.57% 5.65 August 24 0.22 6.93 4. 33 4.45 3 12.50% 6.48 September 7 0.28 6.69 4.40 3.85 3 42.86% 6.92

October 11 2.77 6.17 3. 54 4.06 6 54.55% 4.9 November 16 2.64 7.4 5.74 5.51 2 12.50% 2.66 December 15 3.51 9.2 6.42 6.21 1 6.67% 2.48 DO units are mg/L. Mean precipitation is for Daytona Beach International Airport, in inches.



### Table 2.2. Summary of DO Data by Season for the Verified Period (January 1, 1999 – June 30, 2006)

Season N Minimum Maximum Median Mean No. of Exceedances % Exceedance Mean Total Precipitation Winter 44 0.01 9.2 6.22 6.020568 8 18.18% 9.01 Spring 47 0.53 7.72 5.19 4.750213 15 31.91% 11.36 Summer 38 0.22 6.93 4.33 4.248026 8 21.05% 19.05 Fall 42 2.64 9.2 5.46 5. 382143 9 21.43% 10.04 DO units are mg/L. Mean total precipitation is for Daytona Beach International Airport, in inches.



### Table 2.3. Summary of DO Data by Year for the Verified Period (January 1, 1999 – June 30, 2006)

Year N Minimum Maximum Median Mean No. of Exceedances % Exceedance Total Precipitation 1999 44 0.22 8.31 4.39 4.46 14 31.82% 46.37 2000 14 0.79 8.14 4.22 4.41 6 42.86% 40.16 2001 16 0.01 8.97 4.84 4.28 5 31.25% 58.27 2002 7 4.69 7.73 7.02 6.43 0 0.00% 59.94 2003 27 2.53 8.5 5.28 5.23 7 25.93% 57.3 2004 14 3.08 9.2 5.56 5.71 3 21.43% 62.97 2005 43 3.68 8.52 5.95 5.64 5 11.63% 65.77 2006 6 5.34 8.72 6.45 6.74 0 0.00% 31.36 DO units are mg/L. Total precipitation is for Daytona Beach International Airport, in inches.



### Florida Department of Environmental Protection 7Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



### Table 2.4 summarizes annual average corrected chlorophyll a (chla) concentrations based on the IWR. During the verified period, the 11 micrograms per liter ( μ g/L) threshold was exceeded in 2003. In 2002, 2004, and 2006, there were insufficient data to calculate an annual average.

Table 2.4. Summary of Annual Average Corrected Chla for the Verified Period (January 1, 1999 – June 30, 2006)

Year Mean Exceedance 1999 5.30 no 2000 3.82 no 2001 5.96 no 2002 2003 12.05 yes 2004 2005 2.95 no 2006 Corrected chla units are ug/L. Historical threshold is 5.60 μ g/L based on the 1991–1995 period.



### Florida Department of Environmental Protection 8Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



# Chapter 3. DESCRIPTION OF APPLICABLE WATER QUALITY STANDARDS AND TARGETS

3.1 Classification of the Waterbody and Criteria Ap plicable to the TMDL Florida’s surface waters are protected for five designated use classifications, as follows: Class I Potable water supplies Class II Shellfish propagation or harvesting Class III Recreation, propagation, and maintenance of a healthy, wellbalanced population of fish and wildlife Class IV Agricultural water supplies Class V Navigation, utility, and industrial use (there are no state waters currently in this class) Spruce Creek (WBID 2674A) is a Class III marine waterbody, with a designated use of recreation, propagation, and the maintenance of a healthy, well-balanced population of fish and wildlife. The Class III water quality criteria applicable to the impairment addressed by this TMDL are for DO and nutrients.



## 3.2 Applicable Water Quality Standa rds and Numeric Water Quality Target 3.2.1 Dissolved Oxygen Criterion Numeric criteria for DO are expressed in terms of minimum and daily average concentrations. The water quality criterion for the protection of Class III marine waters, as established by Rule 62-302, F.A.C., states the following: Dissolved Oxygen Criteria: Shall not average less than 5.0 in a 24-hour period and shall never be less than 4.0. Normal daily and seasonal fluctuations above these levels shall be maintained. The nutrient criterion in Rule 62-302, F.A.C., is expressed as a narrative:

Nutrients: In no case shall nutrient concentrations of a body of water be altered so as to cause an imbalance in natural populations of aquatic flora or fauna [Note: For Class III waters in the Everglades Protection Area, this criterion has been numerically interpreted for phosphorus in Section 62-302.540, F.A.C.]. To assess whether this narrative criterion was being exceeded, the IWR provides thresholds for nutrient impairment in estuaries based on annual average chla levels. The following language is found in Rule 62-303, F.A.C.:

Florida Department of Environmental Protection 9Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



### 62-303.353 Nutrients in Estuaries and Open Coastal Waters. Estuaries, estuary segments, or open coastal waters shall be included on the planning list for nutrients if their annual mean chlorophyll a for any year is greater than 11 μ g/l or if data indicate annual mean chlorophyll a values have increased by more than 50% over historical values for at least two consecutive years. 62-303.450 Interpretation of Narrative Nutrient Criteria. (1) A water shall be placed on the verified list for impairment due to nutrients if there are sufficient data from the last five years preceding the planning list assessment, combined with historical data (if needed to establish historical chlorophyll a levels or historical TSIs), to meet the data sufficiency requirements of subsection 62-303.350(2), FA.C. If there are insufficient data, additional data shall be collected as needed to meet the requirements. Once these additional data are collected, the Department shall determine if there is sufficient information to develop a site-specific threshold that better reflects conditions beyond which an imbalance in flora or fauna occurs in thewater segment. If there is sufficient information, the Department shall reevaluate the data using the site-specific thresholds. If there is insufficient information, the Department shall re-evaluate the data using the thresholds provided in Rules 62-303.351-.353, F.A.C., for streams, lakes, and estuaries, respectively. In any case, the Department shall limit its analysis to the use of data collected during the five years preceding the planning list assessment and the additional data collected in the second phase. If alternative thresholds are used for the analysis, the Department shall provide the thresholds for the record and document how the alternative threshold better represents conditions beyond which an imbalance in flora or fauna is expected to occur.

Florida Department of Environmental Protection 10Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



# Chapter 4: ASSESSMENT OF SOURCES

4.1 Types of Sources An important part of the TMDL analysis is the identification of pollutant source categories, source subcategories, or individual sources of pollutants in the watershed and the amount of pollutant loading contributed by each of these sources. Sources are broadly classified as either “point sources” or “nonpoint sources.” Historically, the term “point sources” has meant discharges to surface waters that typically have a continuous flow via a discernable, confined, and discrete conveyance, such as a pipe. Domestic and industrial wastewater treatment facilities (WWTFs) are examples of traditional point sources. In contrast, the term “nonpoint sources” was used to describe intermittent, rainfall-driven, diffuse sources of pollution associated with everyday human activities, incl uding runoff from urban land uses, agriculture, silviculture, and mining; discharges from failing septic systems; and atmospheric deposition. However, the 1987 amendments to the Clean Water Act redefined certain nonpoint sources of pollution as point sources subject to regulat ion under the EPA’s National Pollutant Discharge Elimination System (NPDES) Program. These nonpoint sources included certain urban stormwater discharges, including those from local government master drainage systems, construction sites over five acres, and a wide variety of industries (see Appendix A for background information on the federal and state stormwater programs). To be consistent with Clean Water Act definitions, the term “point source” will be used to describe traditional point sources (such as domestic and industrial wastewater discharges) AND stormwater systems requiring an NPDES stormwater permit when allocating pollutant load reductions required by a TMDL (see Section 6.1 ). However, the methodologies used to estimate nonpoint source loads do not distinguish between NPDES stormwater discharges and non-NPDES stormwater discharges, and as such, this source assessment section does not make any distinction between the two types of stormwater.



## 4.2 Potential Sources of Nutrie nts in the Spruce Creek Watershed

4.2.1 Point Sources There are no NPDES wastewater facilities located in the watershed. Figure 4.1 shows the location of a state-permitted industrial facility along with partial coverage of septic tanks. The Volusia County Department of Public Works Spruce Creek Reverse Osmosis Facility (FLA0185086) discharges demineralization concentrate to a land application system (a 2.3-acre impoundment). It has a monthly design discharge flow of 0.15 million gallons per day (mgd). As shown in Figure 4.1 , the city of Port Orange provides sewer service to portions of the watershed. There are currently approximately 4,700 households connected to the city’s wastewater system in WBID 2674A, and there are also private sewer lines in the Spruce Creek Fly-In subdivision (a portion of which is included in this WBID) (C. Craig, city of Port Orange, personal communication).

Florida Department of Environmental Protection 11Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



### Figure 4.1. Location of Permitt ed Facilities in the Spruce Creek Watershed

Florida Department of Environmental Protection 12Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



### Municipal Separate Storm Sewer System Permittees Volusia County, Port Orange, Ponce Inlet, and New Smyrna Beach have Phase II NPDES municipal separate storm sewer system (MS4) permits (FLR04E033, FLR04E014, FLR04E071, and FLR04E035, respectively) that may cover portions of the Spruce Creek watershed. Figure 4.2, provided by BCI Engineers & Scientists, Inc. (C. Farmer, personal communication), illustrates the juridictional areas for each permittee.

Figure 4.2. Jurisdictional Areas of Phase II NPDES MS4 Permits in the Spruce Creek Watershed



## 4.2.2 Land Uses and Nonpoint Sources Nutrient loadings to Spruce Creek are generated from nonpoint sources in the watershed. These potential sources include loadings from surface runoff, ground water inflow, leakage from collection systems, and septic tanks.

Land Uses The spatial distribution and acreage of different land use categories were identified using the 2004 land use coverage contained in the Department’s geographic information system (GIS) library, initially provided by the SJRWMD. Land use categories and acreages in the watershed

Florida Department of Environmental Protection 13Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



### were aggregated using the Level 3 codes tabulated in Table 4.1. Figure 4.3 shows the principal land uses in the watershed aggregated to the Level 1 land use codes. The Spruce Creek watershed is an area that is facing increased development pressures. As Table 4.1 shows, urban and built-up areas represent 38.4 percent of the area (medium-density residential, 14.7 percent) followed by forest (22.2 percent), and wetlands (21.3 percent).

Table 4.1. Classification of Land Use Categories in the Spruce Creek Watershed

Level 3 Land Use Code Attribute Acres % of Total

1200 Residential, medium density–2- 5 dwelling units/acre 1,174.93 14.73 4110 Pine flatwoods 786.93 9.87 4340 Upland mixed coniferous/hardwood 782.61 9.81 6420 Saltwater marshes 752.96 9.44 1100 Residential, low density–less than 2 dwelling units/acre 593.39 7.44 1300 Residential, high density–6 or more dwelling units/acre 398.58 5.00 6170 Mixed wetland hardwoods 384.12 4.82 5300 Reservoirs–pits, ret ention ponds, dams 251.94 3.16 1820 Golf courses 233.09 2.92 1180 Rural residential 227 2.85 2130 Woodland pastures 187.42 2.35 6300 Wetland forested mixed 176.85 2.22 8140 Roads and highways (divided 4-lanes with medians) 174.32 2.19 1290 Medium density under construction 170.21 2.13 2110 Improved pastures (monoculture, planted forage crops) 167.94 2.11 6120 Mangrove swamps 151.72 1.90
3200 Shrub and brushland (wax myrtle or saw palmetto, occasionally scrub) 126.83 1.59

5100 Streams and waterways 123.03 1.54 1400 Commercial and services 109.41 1.37 3300 Mixed upland nonforested 106.02 1.33 3100 Herbaceous upland nonforested 91.91 1.15 8110 Airports 86.42 1.08 6460 Mixed scrub-shrub wetland 85.51 1.07 6210 Cypress 70.64 0.89 4200 Upland hardwood forests 69.52 0.87 1700 Institutional 57.13 0.72 4130 Sand pine 53.55 0.67 4410 Coniferous pine 52.89 0.66 2510 Horse farms 48.97 0.61 1390 High density under construction 40.1 0.50 1190 Low density under construction 30.79 0.39



### Florida Department of Environmental Protection 14Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients

Level 3 Attribute Acres % of Total Land Use Code 6410 Freshwater marshes 30.16 0.38 4430 Forest regeneration 25.28 0.32 1900 Open land 22.73 0.28 1850 Parks and zoos 19.87 0.25 6250 Hydric pine flatwoods 19.59 0.25 5200 Lakes 18.06 0.23 6440 Emergent aquatic vegetation 13.98 0.18 7430 Spoil areas 12.03 0.15 2430 Ornamentals 9.63 0.12 6180 Cabbage palm hammock 7.62 0.10 1860 Community recreational facilities 7.52 0.09 8330 Water supply plants 4.81 0.06 5400 Bays and estuaries 4.62 0.06 8310 Electrical power facilities 4.57 0.06 6430 Wet prairies 3.38 0.04 8370 Surface water collection basins 3.29 0.04 4400 Tree plantations 2.32 0.03 TOTAL: 7,976.19 100.00%



### Florida Department of Environmental Protection 15Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



### Figure 4.3. Principal Land Uses in the Spruce Creek Watershed

Florida Department of Environmental Protection 16Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



### Soil Characteristics The Soil Survey Geographic Database (SSURGO) in the Department’s GIS database from the SJRWMD was accessed to provide coverage of hydrologic soil groups in the Spruce Creek watershed ( Figure 4.4 ). Table 4.2 briefly describes the major hydrology soil classes. Soil groups A and B/D are the most common in the watershed, with type D found in the lower portion of the watershed and along the stream corridor.

Table 4.2. Description of Hydrologic Soil Classes from the SSURGO Database

Hydrology Class Description



### A High infiltration rates. Soils are deep, well-drained to excessively drained sands and gravels. A/D Drained/undrained hydrology class of soils that can be drained and are classified.

B Moderate infiltration rates. Deep and moderately deep, moderately well- and well-drained soils that have moderately coarse textures. B/D Drained/undrained hydrology class of soils that have moderately coarse textures.

C Slow infiltration rates. Soils with layers impeding downward movement of water, or soils that have moderately fine or fine textures. C/D Drained/undrained hydrology class of soils that can be drained and classified.

D Very slow infiltration rates. Soils are clayey, have a high water table, or are shallow to an impervious layer.



### Population According to the U.S Census Bureau, census block population densities in the Spruce Creek watershed in 2000 ranged from 0 to 12,019 persons per square mile, with an average of 600 persons per square mile ( Figure 4.5 ). Based on this average, the estimated population in the Spruce Creek watershed is 7,472. A more detailed analysis was completed by obtaining population and housing unit information from the 2000 Census at the block level and using GIS to estimate the fraction of each block in the watershed. The fractional area was then applied to the block information to estimate the population and number of housing units. Based on Table 4.3 , the population in the watershed is estimated at 8,587 along with 3,666 housing units. The Census Bureau reports that, for all of Volusia County, the total population for 2000 was approximately 443,343, with 211,938 housing units and an average occupancy rate of 87.2 percent (184,723 units). For all of Volusia County, the bureau reported a housing density of 192 houses per square mile. Thus Volusia County ranks 13 th 

### in housing densities and population in Florida (U.S. Census Bureau Website, 2000). The estimated average housing density in Spruce Creek is 280 residences per square mile, based on population.

Florida Department of Environmental Protection 17Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



### Figure 4.4. Hydrologic Soil Groups Distribution in the Spruce Creek Watershed

Florida Department of Environmental Protection 18Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



### Figure 4.5. Population Density in the Spruce Creek Watershed

Florida Department of Environmental Protection 19Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



### Septic Tanks Based on the 2000 Census figure of 211,938 housing units and the Florida Department of Health (FDOH) estimate of 96,633 permitted septic tanks in Volusia County, approximately 45 percent of the households in the county are using septic tanks. FDOH reports that as of fiscal year 2005–06, there were 96,633 permitted septic tanks in Volusia County (FDOH Website, 2006). From fiscal years 1991–2006 (missing 1992–93), 13,436 permits for repairs were issued, for an average of approximately 960 repairs annually (FDOH Website, 2006) countywide. Simply dividing the number of septic tank repairs by the total number of septic tanks yields an estimated failure rate of 13.9 percent. Assuming that this failure rate is representative of the 14-year period for which data are available, this suggests a rate of 1 percent per year. As noted previously, there were an estimated 8,587 persons and 3,666 households in the Spruce Creek watershed. The average household in the watershed has 2.34 persons (see Table 4.3 ). There are no permitted domestic wastewater facilities in the watershed; however, the city of Port Orange provides sewer service to portions of the watershed. Since the city is experiencing rapid population growth, information on its gravity sewer lines (C. Craig, personal communication) was overlaid on a 2004 aerial of the watershed to obtain an estimate of the number of households connected to the city wast ewater system for comparison with the 2000 Census data. The number of residences conne cted to the city wastewater system was approximately 3,050. Using this estimate, along with the 2000 Census calculation of 3,666 households, suggests that approximately 616 residences are using septic tanks (the partial coverage in Figure 4.1 included 219 septic tanks). This indicates that approximately 17 percent of the households are using septic tanks, or about one-third of the countywide estimate. Using 70 gallons/day/person (EPA, 1999), and drainfield total nitrogen (TN) and total phosphorus (TP) concentrations of 36 mg/L and 15 mg/L, respectively, potential annual ground water loads of TN and TP were calculated. As in the case of earlier estimates, this is a screening level calculation, and soil types, the age of the system, veget ation, proximity to a receiving water, and other factors will influence the degree of attenuation of this load ( Table 4.4 ).

Leaking or Overflowing Wastewater Collection Systems Earlier it was estimated that approximately 3,050 households in the watershed are connected to the city of Port Orange wastewater facility. Using 2.34 people per home and a 70 gallon per person per day discharge, a daily flow of approximately 1.89 x 10 5 

### L is transported through the collection system. An EPA Region 4 memorandum on estimating water quality loadings from MS4 areas (EPA, 2002) suggests that a 5 percent leakage rate from collection systems is realistic. This information and EPA values for nitrogen and phosphorus concentrations in raw sewage yield potential annual loadings of nitrogen and phosphorus of 2,739 lbs/yr and 1,141 lbs/yr, respectively ( Table 4.5 ).

Florida Department of Environmental Protection 20Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



### Table 4.3. Estimated Average Household Size in the Spruce Creek Watershed

Tract Block Population Housing Units 824.10 1 0 0 825.05 1 617 213 825.05 2 2188 757 825.05 3 835 225 825.07 1 101 51

828 1 744 397 829.01 1 65 22 832.04 3 4337 2001 Total 8,587 3,666 AVERAGE HOUSEHOLD SIZE: 

### 2.34 Data from U.S. Census Bureau Website, 2005, based on Volusia County blocks that are present in the Spruce Creek watershed.



### Table 4.4. Estimated Nitrogen and Phosphorus Annual Loading from Septic Tanks in the Spruce Creek Watershed

Estimated No. Households

on Septic Estimated No. Persons Per Household 1 Gallons/ Person/

Day 2 TN in Drainfield

(mg/L) TP in Drainfield

(mg/L) Estimated Annual TN Load (lbs/yr) Estimated Annual TP Load (lbs/yr)

616 2.34 70 36 15 11,065 4,611

1 U.S Census Bureau; see Table 4.3 for more information on this estimate. 2 EPA, 1999.



### Table 4.5. Estimated Loading from Wastewater Collection Systems in the Spruce Creek Watershed

Parameter Estimated Homes on

Central Sewer Estimated Daily Flow (L) Daily Leakage (L) Raw Sewage (mg/L) Estimated Load (lbs/yr)
Nitrogen 3,050 1.89 x 10 6 9.45 x 10 4 36 2,739 Phosphorus 3,050 1.89 x 10 6 9.45 x 10 4 15 1,141



### Florida Department of Environmental Protection 21Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



## 4.3 Source Summary 4.3.1 Summary of Nutrient Load ings to Spruce Creek from Various Sources Agriculture Aggregating land use to Level 1 for the Spruce Creek watershed yields 414 acres in agriculture. Harper et al. (2003) summarized a number of stormwater studies conducted in Florida, and based on those studies provided mean stormwater water quality parameters and hydrologic characteristics for a variety of land uses, including pastureland. According to Harper et al. (2003), mean stormwater concentrations for TN, TP, and biochemical oxygen demand (BOD) from pastureland are 2.48 mg/L, 0.476 mg/L, and 5.1 mg/L, respectively. The report also gave a mean runoff coefficient of 0.355. A more detailed loading analysis could be performed based on soil types, annual rainfall amounts, and specific agricultural activities in the watershed. However, as a screening analysis, annual loads taken from the BASINS 3.0 User Manual, Appendix IV (EPA, 2001), for pasturelands in Florida were used as preliminary estimates ( Table 4.6 ).

Table 4.6. Estimated Annual Average TN and TP Loads from Agriculture in the Spruce Creek Watershed

Agricultural

Acreage TN (lbs/ac/yr) TN load (lbs/yr) TP (lbs/ac/yr) TP load (lbs/yr)

414 5.60 2,318 0.60 248

Source: EPA, 2001.



### Urban Areas There are 3,085 acres in the Level 1 category of urban and built-up in the watershed and 174 acres of highways. According to Harper et al. (2003), mean stormwater concentrations for TN, TP, and BOD from single-family residential lands are 2.18 mg/L, 0.335 mg/L, and 7.4 mg/L, respectively. The report also gave a mean runo ff coefficient of 0.33. Mean stormwater concentrations for TN, TP, and BOD from multifamily residential lands are 2.42 mg/L, 0.49 mg/L, and 11.0 mg/L, respectively. The report also gave a mean runoff coefficient of 0.675. A more detailed loading analysis could be performed based on soil types, annual rainfall amounts, and specific agricultural activities in the watershed. However, as a screening analysis, annual loads taken from the BASINS 3.0 User Manual, Appendix IV (EPA, 2001), for pasturelands in Florida were used ( Table 4.7) . Medium- and high-density land uses were combined into the multifamily category, and some land uses in Level 1 were not included in the loading estimate (for example, golf courses).

Florida Department of Environmental Protection 22Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



### Table 4.7. Estimated Urban and Built-up Annual Nitrogen and Phosphorus Loading in the Spruce Creek Watershed

Urban Category Acreage 

### TN (lbs/ac/yr) TN load (lbs/yr) TP (lbs/ac/yr) TP load (lbs/yr) Low-Density

residential 851.2 4.43 3,771 0.47 400 Multifamily residential 1,783.8 7.07 12, 612 1.97 3,514

Commercial 109.4 9.48 1,037 2.05 224

Highway 174.3 6.25 1,089 2.50 436 Open Lands 22.7 2.32 53 0.16 4 Totals 2,941.4 18,562 4,578 Source: BASINS 3.0 Users Manual, Appendix IV.



### Upstream Drainage Area of Spruce Creek As discussed earlier, Spruce Creek is divided into two WBIDs, and this TMDL focuses on the lower WBID (2674A). A simple estimate of annual TN and TP loading from the upper WBID was obtained by multiplying annual average flows from U.S. Geological Survey (USGS) Gage 02248000 and nutrient concentrations ( Table 4.8 ).

Table 4.8. Estimated Annual Nitrogen and Phosphorus Loading to WBID 2674A from WBID 2674, 1991–2005

Year # TN Samples Mean TN (mg/L) # TP Samples Mean TP (mg/L) Avg. Flow (cfs) TN Load (lbs/yr) TP Load (lbs/yr) 1991 7 1.49 7 0.159 53. 9 158,420.3 16,827.4 1992 5 1.42 5 0.152 23 64,301.3 6,883.0 1993 3 0.98 3 0.147 13. 2 25,373.2 3,811.6 1995 40 1.23 40 0.213 41. 1 99,911.6 17,261.9 1996 42 0.92 42 0.188 37. 7 67,960.2 13,957.7 1997 43 0.99 43 0.141 15. 3 29,759.2 4,241.0 1998 43 1.23 43 0.119 47. 1 114,184.1 11,035.0 1999 43 1.00 42 0.118 41 80,790.7 9,515.5 2000 41 0.88 41 0.085 4.6 7,937.9 770.5 2001 42 1.08 42 0.120 63. 7 135,359.7 15,048.1 2002 42 0.92 42 0.095 25. 3 45,609.0 4,740.3 2003 42 1.08 42 0.101 39. 1 82,778.6 7,805.3 2004 37 1.07 37 0.112 42. 3 88,931.1 9,321.5 2005 50 1.32 50 0.141 50. 5 131,241.9 14,020.9 Average 1.08 0.131 80,897 9,660 cfs – Cubic feet per second.



### Florida Department of Environmental Protection 23Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



### Table 4.9 summarizes the various estimates from various anthropogenic sources. It is important to note that this is not a complete list and represents estimates of potential loadings. In addition, proximity to the waterbody, soil characteristics, and rainfall frequency and magnitude are just a few of the factors that could influence and determine the actual loadings from these sources that reach Spruce Creek. For example, where are the improved pasture and high-density residential areas relative to Spruce Creek, and is there a riparian buffer area between these land uses and the stream? What types of best management practices (BMPs), both structural and nonstructural, have been implemented for specific land uses in the watershed that reduce the actual nutrient loads delivered to Spruce Creek? Finally, what is the age and condition of the septic and collection systems and drainage characteristics in the watershed compared with the county overall that could affect assumptions about the assimilation and/or retention of nutrients?

Table 4.9. Summary of Estimated Potential Annual Nitrogen and Phosphorus Loading from Various Sources in the Spruce Creek Watershed

Source Total Nitrogen (lbs/yr) Total Phosphorus (lbs/yr) Septic Tanks 11,065 4,611 Urban and Built-up 18,562 4,578 Leaking Collection Systems 2,739 1.141 Agriculture 2,318 248 Upstream WBID 80,897 9,660



### Florida Department of Environmental Protection 24Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



# Chapter 5: DETERMINATION OF ASSIMILATIVE CAPACITY

5.1 Determination of Loading Capacity A USGS gaging site on Spruce Creek (02248053) has daily discharge data over the period from December 27, 2000, to September 30, 2006. As seen in Figure 5.1 , the stream is tidally influenced at this location, with over 70 percent of the daily flows suggesting upstream transport. Another USGS gaging site farther upstream on Spruce Creek (02248000) has operated since 1951 and is not tidally influenced. Table 5.1 provides physical and streamflow statistics for these two gages. Due to the tidal influence and limited period of record, annual nutrient loads were not estimated for WBID 2674A based on flow and instream nutrient measurements. The upstream gage flows were paired with observations as part of the correlation analysis and for the calculation of nutrient loads contributed from WBID 2674 to WBID 2674A. To determine the TMDL, relationships between DO and nutrients were examined to identify the reductions that would be required to meet applicable criteria.

Figure 5.1. Daily Discharge Recorded at USGS Gage 02248053: Spruce Creek Near New Smyrna Beach



# USGS 02248053

-500 0 500 1000 1500 2000 2500 3000

3/15/ 2000 1/9/20 01

1 1/5/ 2001 9/1/20 02 6/28 / 2003 4/23/ 20

04 2/17/ 2005

1 2/14/2 005

1 0/10/2006



## DATEDISCHARGE (CFS)



### Florida Department of Environmental Protection 25Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



### Table 5.1. Physical and Statistical Summaries for USGS Gaging Sites in the Spruce Creek Watershed USGS Gages Gage # 02248000 02248053 Drainage Area (square miles) 33.4 60.7 Period of Record 10/2/1951 – Present 12/27/2000 – 9/30/2006 Mean Basin Elevation (feet) 28

Stream slope (feet/mile) 0.6 Flow Duration 1% (cfs) 372 1,102.6 5% (cfs) 160 379.3 10% (cfs) 83 255.7 20% (cfs) 35 180 25% (cfs) 25 154 50% (cfs) 6.3 47.5 70% (cfs) 2.4 -18 75% (cfs) 1.9 -36.5 90% (cfs) 0.92 -106.4 95% (cfs) 0.59 -138.3 99% (cfs) 0.29 -208.8



## 5.1.1 Data Used in the Determination of the TMDL Seventeen sampling stations on Spruce Creek have historical DO observations ( Figure 5.2 ). Five of the Department stations were established and sampled during 2005. Table 5.2 contains summary information on each of the stations. Table 5.3 provides a statistical summary of DO observations at each station, and Appendix B contains historical DO, corrected chla, TN, and TP observations from the sites for the planning and verified periods for WBID 2674A. Figure 5.3 displays the historical observations of DO over time. DO exceedance rates by station range between 20 and 60 percent. A linear regression of DO versus sampling date in Figure 5.3 indicates no significant trend over time (R 2 

### = 0.0009). Appendix E contains plots of DO by season, station, and year. Figures 5.4 through 5.6 present historical corrected chla, TN, and TP observations, respectively. Linear regressions of each parameter versus sampling date indicate no significant trend over time (R 2 

### values for each < 0.08). Appendix E contains additional plots.

Florida Department of Environmental Protection 26Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



### Table 5.2. Sampling Station Summary for the Spruce Creek Watershed

Station STORET ID Station Owner Years With Data N

Spruce Creek Center Bridge on U.S. Hwy 1 21FLVEMDSC01 Volusia County 1991–98 77 Spruce Creek West of SSC Railroad 21FLVEMDSC02 Volusia County 1991–98 77

Spruce Creek West of Airport Rd 21FLVEMDSC04 Volusia County 1991–98 78 Spruce Creek at Dock at Gamble Place 21FLVEMDSC05 Volusia County 1991–98 78 Spruce Creek 100 M Upstream from ICWW 21FLSJWMSPRCR SJRWMD 1992 1 Spruce Creek at Airport Rd 21FLSJWMUEC014 SJRWMD 1992–93 5 Spruce Creek, from W. Side of Center Bridge on U.S. 1 21FLVEMDVC-071 Volusia County 1999–2006 35 Spruce Creek, from Dock at Riverwood, W. of SCL Railroad 21FLVEMDVC-072 Volusia County 1999–2006 39 Spruce Creek, from W. Side of Moody Bridge on Airport Rd 21FLVEMDVC-073 Volusia County 1999–2006 35 Spruce Creek, from Dock at Gamble Place 21FLVEMDVC-074 Volusia County 1999–2005 28 Spruce Creek @ Cypress Head Development 21FLWPB 20010737 Department 2003 6 Spruce Creek @ Airport Rd 21FLWPB 20010738 Department 2003 6 Spruce Creek @ 675M Upstream of RR Bridge 21FLCEN 27010193 Department 2005 5 Spruce Creek @ 0.68 Miles Upstream of RR Bridge 21FLCEN 27010194 Department 2005 6 Spruce Creek @ 0.87 Miles Upstream of RR Bridge 21FLCEN 27010195 Department 2005 5 Spruce Creek @ 1.07 Miles Upstream of RR Bridge 21FLCEN 27010196 Department 2005 5 Spruce Creek @ 1.3 Miles Upstream of RR Bridge 21FLCEN 27010197 Department 2005 6



### Florida Department of Environmental Protection 27Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



### Table 5.3. Statistical Summary of Historical Data for Spruce Creek

Station N Minimum Maximum Median Mean Exceedances % Exceedance Spruce Creek Center Bridge on U.S. Hwy 1 77 3.69 9.99 6.20 6.37 2 2.60% Spruce Creek West of SSC Railr oad 77 3.59 8.36 5. 51 5.79 2 2.60%

Spruce Creek West of Airport Rd 78 0.07 7.99 3. 23 3.29 49 62.82% Spruce Creek at Dock at Gamble Place 78 0.15 7.99 3.96 3.78 42 53.58% Spruce Creek 100 M Upstream from ICWW 1 5.1 5.1 5.10 5.10 0 0.00% Spruce Creek at Airport Rd 5 1.7 6.4 2. 70 3.48 3 60.00% Spruce Creek, from W. Side of Center Bridge on U.S. 1 35 0.53 9.20 6.48 6.48 1 2.86% Spruce Creek, from Dock at Riverwood, W. of SCL Railroad 39 3.34 9.2 5.99 6.00 2 5.13% Spruce Creek, from W. Side of

Moody Bridge on Airport Rd 35 0.04 7.09 4.16 3.86 16 45.71%

Spruce Creek, from Dock at Gamble Place 28 0.01 6.42 3.56 3.45 15 53.57% Spruce Creek @ Cypress Head Development 6 6.17 7.505 6.93 6.89 0 0.00% Spruce Creek @ Airport Rd 6 2.53 5.88 4.05 4.10 3 50.00% Spruce Creek @ 675M Upstream of RR Bridge 5 3.68 6.5 6.05 5.34 1 20.00% Spruce Creek @ 0.68 Miles

Upstream of RR Bridge 6 3.7 6.38 5.82 5.35 1 16.67% Spruce Creek @ 0.87 Miles

Upstream of RR Bridge 5 3.72 6.44 5.65 5.29 1 20.00% Spruce Creek @ 1.07 Miles

Upstream of RR Bridge 5 3.76 6.42 5.73 5.27 1 20.00% Spruce Creek @ 1.3 Miles

Upstream of RR Bridge 6 3.7 6.54 4.73 5.06 1 16.67% DO concentrations are mg/L.



### Florida Department of Environmental Protection 28Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



### Figure 5.2. Historical Sampling Sites in the Spruce Creek Watershed

Florida Department of Environmental Protection 29Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



## DO VERSUS SAMPLE DATE

0 2 4 6 8 10 12

SAMPLE DATEDISSOLVEDOXYGEN (MG/L)

CEN 27010193 CEN 27010194 CEN 27010195 CEN 27010196 VEMDSC01 VEMDSC02 VEMDSC04 VEMDSC05 SJWMSPRCR SJWMUEC014 VEMDVC-072 VEMDVC-073 VEMDVC-074 WPB 20010737 WPB 20010738 CEN 27010197 CRITERION VEMDVC-071



### Figure 5.3. Historical DO Observations for Spruce Creek



## CORR CHLA VERSUS SAMPLE DATE

0 5 10 15 20 25 30 35 40 45 50

1/1/91 1/1 / 92 1/1 /9

3 1/1/94 1 /1 /95 1 / 1/96 1/1 /9

7 1/1/ 9 8 1 /1 /99 1 / 1/00 1 /1

/01 1/1/ 0 2 1 /1 /03 1/1/04 1/1/05 1/1/06 1/1/07



### SAMPLE DATECORR CHLA (UG/L)

VEMDSC01 VEMDSC02 VEMDSC04 VEMDSC05 SJWMSPRCR SJWMUEC014 VEMDVC-072 VEMDVC-073 VEMDVC-074 WPB 20010737 WPB 20010738 CEN 27010193 CEN 27010194 CEN 27010195 CEN 27010196 CEN 27010197



### Figure 5.4. Historical Corrected Chla Observations for Spruce Creek

Florida Department of Environmental Protection 30Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



## TN VERSUS SAMPLING DATE

0.00 0.40 0.80 1.20 1.60 2.00 2.40 2.80 3.20 3.60 4.00

1/1/91 1/1/92 1/ 1 /93 1/ 1 /94 1/ 1/ 9 5 1/ 1 /96 1/ 1/ 9 7 1 /1 / 9 8 1/1/99 1 /1 / 00 1/1/01 1/ 1 /02 1/1/03 1/ 1 /04 1/ 1/ 0 5 1/ 1/ 06 1 / 1/ 0 7



### SAMPLING DATETOTAL NITROGEN(MG/L)

VEMDSC01 VEMDSC02 VEMDSC04 VEMDSC05 SJWMSPRCR SJWMUEC014 VEMDVC-072 VEMDVC-073 VEMDVC-074 WPB 20010737 WPB 20010738 CEN 27010193 CEN 27010194 CEN 27010195 CEN 27010196 CEN 27010197



### Figure 5.5. Historical TN Observations for Spruce Creek



## TP VERSUS SAMPLING DATE

0 0.2 0.4 0.6 0.8

5 /7 / 9 0 9/19/91

1 /3

1 / 93 6 /1

5 / 94 10/28/95 3/11/97 7/24/98

1 2 /6 / 9 9 4/19/ 0 1 9/1 / 0 2 1/14/04 5 / 2 8 / 05

1 0 /1

0 / 0 6 2 /2 2 / 08



### SAMPLE DATETOTALPHOSPHORUS(MG/L)

VEMDSC01 VEMDSC02 VEMDSC04 VEMDSC05 SJWMSPRCR SJWMUEC014 VEMDVC-072 VEMDVC-073 VEMDVC-074 WPB 20010737 WPB 20010738 CEN 27010193 CEN 27010194 CEN 27010195 CEN 27010196 CEN 27010197



### Figure 5.6. Historical TP Observations for Spruce Creek

Florida Department of Environmental Protection 31Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



## 5.1.2 TMDL Development Process A Spearman correlation matrix was used to assess potential relationships between DO and other water quality parameters ( Appendix G ). At an alpha ( α ) level of 0.05, correlations between DO and TP, nitrogen ammonia (NH 4 

### ), and BOD were significant. Figure 5.7 illustrates the relationship and the regression equation between DO and TP. As discussed in the standards section of the report, the DO criterion for Class III marine waters allows a minimum concentration of 4.0 mg/L, as long as a daily average of 5.0 mg/L is maintained. Although the impairment decision was based on exceedances below the 4.0 mg/L minimum, the TMDL target for TP was selected as the level predicted to achieve a minimum DO of 5.0 mg/L in order to add an implicit margin of safety and ensure that both components of the criteria are met. Based on the regression equation, DO concentrations of 5.0 mg/L or greater would be related to TP concentrations less than 0.16 mg/L. For each individual observation of TP greater than 0.16 mg/L, an individual required reduction was calculated using the following:

[(observed value) – (0.15)] x 100 (observed value) 

### After the individual results were calculated, the median of the individual values was calculated, which is 27 percent ( Table 5.4 ). Use of the median was considered adequately protective since the calculations were based only on measurements above 0.16 mg/L and half of the observations were already at or below 0.16 mg/L. Although the correlation between DO and NH 4 

### was significant at an alpha ( α ) level of 0.05 (68 paired samples), the correlation between DO and TN was not significant (p = 0.172, 343 paired samples). Ammonia represented 7 percent or less of the TN in 80 percent of the available observations. Consequently, requiring reductions in NH 4 

### as part of the TMDL would have minimal effects on improving DO or reducing algal biomass. Figure 5.8 illustrates the relationship and the regression equation between DO and BOD. As in the case with TP, the TMDL considered BOD reductions necessary to achieve a DO concentration of 5.0 mg/L. Based on the regression equation, DO concentrations of 5.0 mg/L or greater would be related to BOD concentrations less than 2.17 mg/L. For each individual observation of BOD greater than 2.17 mg/L, an individual required reduction was calculated using the following:

[(observed value) – (2.17)] x 100 (observed value) 

### After the individual results were calculated, the median of the individual values was calculated, which is 25 percent ( Table 5.5 ). Note there were only 27 measurements of BOD, and all of the samples were collected during 2005 over 7 sampling dates; where 5 stations were sampled on the same day for 5 of the 7 sampling dates. Additional BOD monitoring is recommended to augment the TMDL. Spruce Creek was also impaired for nutrients based on an annual chlorophyll of 12.05 μ g/l in 2003. Comparing the 2003 average with the 11 μ g/L threshold suggests that less than a 9 percent reduction in the annual average is necessary to meet the threshold. A cumulative frequency distribution of corrected chlorophyll can be found in Appendix E. Ninety percent of

Florida Department of Environmental Protection 32Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



### the nearly 400 chlorophyll observations are less than 11.7 μ g/L. The Spearman correlation between DO and corrected chla was negative (inverse relationship), and the linear regression was significant at an alpha ( α ) level of 0.05. A 27 percent reduction of total phosphorus to Spruce Creek will result in lower algal biomass and is believed to be sufficient to result in an annual average chla concentration below the 11 μ g/L threshold.

Figure 5.7. Relationship Between DO and TP Observations for Spruce Creek



## DISSOLVED OXYGEN VERSUS TP

y = -8.9405x + 6.389 R 2 

### = 0.1785

0 2 4 6 8 10 12

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 TOTAL PHOSPHORUS (MG/L)DISSOLVED OXYGEN(MG/L)



### Florida Department of Environmental Protection 33Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



# DISSOLVED OXYGEN VERSUS BOD

y = -0.8918x + 6.9383 R

2 

## = 0.6848 0 1 2 3 4 5 6 7

012345 BOD (MG/L)DISSOLVED OXYGEN(MG/L)



### Figure 5.8. Relationship Between DO and BOD Observations for Spruce Creek

Florida Department of Environmental Protection 34Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



### Table 5.4. Calculation of TP Reductions for the DO TMDL for Spruce Creek

Sample Date Station Observed TP Value (mg/L) % Reduction

1/6/1992 VEMDSC05 0.21 23.81% 3/2/1992 VEMDSC04 0.19 15.79% 3/2/1992 VEMDSC05 0.22 27.27% 4/6/1992 VEMDSC04 0.18 11.11% 4/6/1992 VEMDSC05 0.27 40.74% 5/4/1992 VEMDSC02 0.22 27.27% 5/4/1992 VEMDSC04 0.24 33.33% 5/4/1992 VEMDSC05 0.25 36.00% 6/1/1992 VEMDSC05 0.25 36.00% 7/6/1992 VEMDSC02 0.19 15.79% 7/6/1992 VEMDSC01 0.19 15.79% 7/6/1992 VEMDSC04 0.22 27.27% 8/3/1992 VEMDSC01 0.26 38.46% 8/3/1992 VEMDSC05 0.27 40.74% 8/3/1992 VEMDSC02 0.35 54.29% 9/9/1992 VEMDSC02 0.17 5.88% 9/9/1992 VEMDSC02 0.17 5.88% 10/5/1992 VEMDSC05 0.22 27.27% 10/5/1992 VEMDSC01 0.28 42.86% 10/5/1992 VEMDSC02 0.33 51.52% 1/4/1993 VEMDSC04 0.18 11.11% 1/4/1993 VEMDSC02 0.2 20.00% 5/4/1993 VEMDSC04 0.69 76.81% 6/8/1993 VEMDSC02 0.21 23.81% 6/8/1993 VEMDSC04 0.3 46.67% 6/8/1993 VEMDSC05 0.3 46.67% 7/7/1993 VEMDSC04 0.23 30.43% 7/7/1993 VEMDSC05 0.26 38.46% 7/7/1993 VEMDSC01 0.27 40.74% 8/2/1993 VEMDSC02 0.18 11.11% 8/2/1993 VEMDSC05 0.28 42.86% 8/2/1993 VEMDSC04 0.4 60.00% 9/8/1993 VEMDSC04 0.66 75.76% 10/4/1993 VEMDSC02 0.17 5.88% 10/4/1993 VEMDSC05 0.22 27.27% 10/4/1993 VEMDSC04 0.24 33.33% 11/1/1993 VEMDSC05 0.23 30.43% 1/3/1994 VEMDSC04 0.3 46.67% 1/3/1994 VEMDSC05 0.375 57.33% 4/4/1994 VEMDSC05 0.17 5.88% 4/4/1994 VEMDSC04 0.22 27.27% 5/2/1994 VEMDSC01 0.17 5.88% 5/2/1994 VEMDSC02 0.245 34.69%



### Florida Department of Environmental Protection 35Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients

Observed TP Value Sample Date Station % Reduction (mg/L) 5/2/1994 VEMDSC04 0.27 40.74% 5/2/1994 VEMDSC05 0.36 55.56% 6/6/1994 VEMDSC02 0.205 21.95% 6/6/1994 VEMDSC05 0.28 42.86% 6/6/1994 VEMDSC04 0.38 57.89% 7/6/1994 VEMDSC04 0.17 5.88% 7/6/1994 VEMDSC02 0.23 30.43% 8/1/1994 VEMDSC02 0.265 39.62% 8/1/1994 VEMDSC05 0.53 69.81% 8/1/1994 VEMDSC04 0.61 73.77% 9/6/1994 VEMDSC05 0.19 15.79% 9/6/1994 VEMDSC04 0.22 27.27% 10/3/1994 VEMDSC04 0.19 15.79% 10/3/1994 VEMDSC05 0.22 27.27% 10/3/1994 VEMDSC02 0.29 44.83% 11/1/1994 VEMDSC01 0.19 15.79% 11/1/1994 VEMDSC02 0.25 36.00% 11/1/1994 VEMDSC05 0.42 61.90% 11/1/1994 VEMDSC04 0.625 74.40% 12/5/1994 VEMDSC04 0.17 5.88% 1/9/1995 VEMDSC04 0.2 20.00% 5/1/1995 VEMDSC02 0.22 27.27% 5/1/1995 VEMDSC01 0.23 30.43% 5/1/1995 VEMDSC04 0.34 52.94% 6/5/1995 VEMDSC02 0.2 20.00% 6/5/1995 VEMDSC05 0.26 38.46% 6/5/1995 VEMDSC04 0.275 41.82% 6/5/1995 VEMDSC01 0.32 50.00% 7/10/1995 VEMDSC02 0.2 20.00% 7/10/1995 VEMDSC04 0.32 50.00% 8/7/1995 VEMDSC05 0.2 20.00% 8/7/1995 VEMDSC02 0.24 33.33% 8/7/1995 VEMDSC01 0.25 36.00% 9/5/1995 VEMDSC01 0.2 20.00% 9/5/1995 VEMDSC05 0.2 20.00% 9/5/1995 VEMDSC02 0.22 27.27% 9/5/1995 VEMDSC04 0.255 37.25% 10/2/1995 VEMDSC04 0.17 5.88% 10/2/1995 VEMDSC01 0.19 15.79% 10/2/1995 VEMDSC02 0.23 30.43% 11/6/1995 VEMDSC02 0.25 36.00% 11/6/1995 VEMDSC01 0.3 46.67% 2/5/1996 VEMDSC04 0.24 33.33% 3/4/1996 VEMDSC01 0.2 20.00% 3/4/1996 VEMDSC04 0.41 60.98% 4/1/1996 VEMDSC05 0.165 3.03% 4/1/1996 VEMDSC04 0.22 27.27%



### Florida Department of Environmental Protection 36Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients

Observed TP Value Sample Date Station % Reduction (mg/L) 4/1/1996 VEMDSC02 0.24 33.33% 4/1/1996 VEMDSC01 0.34 52.94% 5/6/1996 VEMDSC04 0.175 8.57% 6/3/1996 VEMDSC01 0.23 30.43% 6/3/1996 VEMDSC02 0.33 51.52% 7/8/1996 VEMDSC01 0.2 20.00% 7/8/1996 VEMDSC05 0.235 31.91% 7/8/1996 VEMDSC04 0.34 52.94% 7/8/1996 VEMDSC02 0.4 60.00% 8/5/1996 VEMDSC04 0.17 5.88% 9/3/1996 VEMDSC01 0.17 5.88% 9/3/1996 VEMDSC04 0.26 38.46% 10/7/1996 VEMDSC01 0.23 30.43% 10/7/1996 VEMDSC02 0.29 44.83% 10/7/1996 VEMDSC05 0.43 62.79% 10/7/1996 VEMDSC04 0.53 69.81% 1/6/1997 VEMDSC05 0.2 20.00% 1/6/1997 VEMDSC01 0.22 27.27% 2/3/1997 VEMDSC04 0.2 20.00% 3/3/1997 VEMDSC01 0.17 5.88% 4/7/1997 VEMDSC02 0.17 5.88% 4/7/1997 VEMDSC04 0.17 5.88% 4/7/1997 VEMDSC05 0.2 20.00% 6/2/1997 VEMDSC05 0.17 5.88% 6/2/1997 VEMDSC04 0.19 15.79% 7/7/1997 VEMDSC04 0.21 23.81% 7/7/1997 VEMDSC05 0.35 54.29% 8/4/1997 VEMDSC05 0.21 23.81% 8/4/1997 VEMDSC04 0.21 23.81% 9/8/1997 VEMDSC05 0.18 11.11% 9/8/1997 VEMDSC02 0.21 23.81% 9/8/1997 VEMDSC04 0.22 27.27% 10/6/1997 VEMDSC04 0.19 15.79% 11/3/1997 VEMDSC02 0.26 38.46% 11/3/1997 VEMDSC05 0.27 40.74% 11/3/1997 VEMDSC04 0.44 63.64% 3/2/1998 VEMDSC02 0.17 5.88% 3/2/1998 VEMDSC04 0.2 20.00% 5/4/1998 VEMDSC05 0.19 15.79% 6/1/1998 VEMDSC04 0.17 5.88% 6/1/1998 VEMDSC05 0.51 68.63% 7/6/1998 VEMDSC01 0.175 8.57% 7/6/1998 VEMDSC02 0.18 11.11% 7/6/1998 VEMDSC04 0.43 62.79% 7/6/1998 VEMDSC05 0.64 75.00% 8/3/1998 VEMDSC02 0.19 15.79% 8/3/1998 VEMDSC05 0.44 63.64%



### Florida Department of Environmental Protection 37Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients

Sample Date Station Observed TP Value (mg/L) % Reduction

8/3/1998 VEMDSC04 0.51 68.63% 9/8/1998 VEMDSC02 0.165 3.03% 9/8/1998 VEMDSC05 0.24 33.33% 9/8/1998 VEMDSC04 0.35 54.29% 10/6/1998 VEMDSC02 0.18 11.11% 10/6/1998 VEMDSC05 0.23 30.43% 10/6/1998 VEMDSC04 0.24 33.33% 11/2/1998 VEMDSC04 0.17 5.88% 11/2/1998 VEMDSC05 0.17 5.88% 12/2/1998 VEMDSC05 0.18 11.11% 2/1/1999 VEMDVC-072 0.17 5.88% 2/1/1999 VEMDVC-074 0.18 11.11% 3/1/1999 VEMDVC-072 0.4 60.00% 4/5/1999 VEMDVC-074 0.24 33.33% 5/3/1999 VEMDVC-071 0.19 15.79% 5/3/1999 VEMDVC-072 0.19 15.79% 5/3/1999 VEMDVC-073 0.21 23.81% 5/3/1999 VEMDVC-074 0.3 46.67% 6/7/1999 VEMDVC-072 0.17 5.88% 6/7/1999 VEMDVC-074 0.29 44.83% 6/7/1999 VEMDVC-073 0.3 46.67% 7/7/1999 VEMDVC-073 0.18 11.11% 7/7/1999 VEMDVC-071 0.19 15.79% 7/7/1999 VEMDVC-072 0.21 23.81% 8/2/1999 VEMDVC-072 0.18 11.11% 8/2/1999 VEMDVC-073 0.43 62.79% 9/7/1999 VEMDVC-074 0.25 36.00% 10/4/1999 VEMDVC-071 0.2 20.00% 10/4/1999 VEMDVC- 072 0.28 42.86% 10/4/1999 VEMDVC- 073 0.32 50.00% 11/1/1999 VEMDVC- 072 0.19 15.79% 11/1/1999 VEMDVC- 071 0.19 15.79% 4/3/2000 VEMDVC-074 0.19 15.79% 4/3/2000 VEMDVC-071 0.2 20.00% 4/3/2000 VEMDVC-073 0.22 27.27% 4/3/2000 VEMDVC-072 0.25 36.00% 7/10/2000 VEMDVC- 074 0.24 33.33% 7/10/2000 VEMDVC- 073 0.24 33.33% 10/2/2000 VEMDVC-073 0.2 20.00% 2/5/2001 VEMDVC-073 0.25 36.00% 2/5/2001 VEMDVC-074 0.41 60.98% 8/6/2001 VEMDVC-072 0.22 27.27% 8/6/2001 VEMDVC-071 0.22 27.27% 8/6/2001 VEMDVC-073 0.31 48.39% 8/6/2001 VEMDVC-074 0.31 48.39% 11/5/2001 VEMDVC- 071 0.19 15.79% 9/9/2002 VEMDVC-071 0.2 20.00%



### Florida Department of Environmental Protection 38Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients

Observed TP Value (mg/L) % Reduction Sample Date Station

5/5/2003 VEMDVC-071 0.18 11.11% 8/4/2003 VEMDVC-071 0.19 15.79% 8/13/2003 WPB 20010738 0.236 32.20% 8/26/2003 WPB 20010738 0.325 50.77% 10/9/2003 WPB 20010738 0.195 17.95% 6/13/2005 CEN 27010195 0.27 40.74% 6/13/2005 CEN 27010194 0.29 44.83% 6/13/2005 CEN 27010193 0.315 49.21% 8/8/2005 CEN 27010195 0.31 48.39% 8/8/2005 CEN 27010193 0.35 54.29% 8/8/2005 CEN 27010194 0.36 55.56% 4/3/2006 VEMDVC-071 0.22 27.27% 10/3/2006 VEMDVC- 073 0.21 23.81% MEDIAN: 27.27%



### Table 5.5. Calculation of BOD Reductions for the DO TMDL for Spruce Creek

Sample Date Station Observed BOD value (mg/L) % Reduction

8/8/2005 CEN 27010194 2.3 5.65 8/8/2005 CEN 27010193 2.4 9.58 8/8/2005 CEN 27010195 2.5 13.20 4/5/2005 CEN 27010194 2.6 16.54 8/8/2005 CEN 27010196 2.8 22.50 8/8/2005 CEN 27010197 2.9 25.17 6/13/2005 CEN 27010196 3 27.67 6/13/2005 CEN 27010197 3 27.67 6/13/2005 CEN 27010193 3.1 30.00 6/13/2005 CEN 27010195 3.5 38.00 6/13/2005 CEN 27010194 4.2 48.33 MEDIAN: 25.17



## 5.1.3 Critical Conditions/Seasonality A nonparametric test (Kruskal-Wallis) was applied to the DO, DO saturation (DOSAT), corrected chla, TN, and TP datasets to determine whether there were significant differences among months or seasons. At an alpha ( α ) level of 0.05, there were significant differences among seasons or months for all the parameters ( Appendices C and D ). As seen in Table 5.6 , all seasons had at least a 21 percent exceedance rate. All months had exceedance rates of at least 11 percent, while June, July, and September had the highest exceedance rates. Consequently, the percent reductions were calculated throughout the year and covered all months and seasons.

Florida Department of Environmental Protection 39Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



### Rainfall records for Daytona Beach International Airport ( Appendices F and I) were used to determine rainfall amounts associated with individual sampling dates. Rainfall recorded on the day of sampling (PRECIP) and the cumulative total for the day of and the previous two days (RAINDAY3) were paired with the respective DO observation. The simple correlations (r values in the Spearman correlation table) between both DO and the PRECIP and RAINDAY3 rainfall totals were negative (inverse relationship); however, they were not significant at an alpha ( α ) level of 0.05.

Table 5.6. Monthly and Seasonal Exceedance Rates for DO

# of Observations # of Exceedances % Exceedance Month January 36 10 27.8% February 45 8 17.8%

March 33 6 18.2% April 36 4 11.1% May 30 9 23.3% June 43 21 48.8% July 32 14 43.8% August 34 11 32.3% September 24 12 50.0%

October 36 10 27.8% November 36 8 22.2% December 38 11 28.9% # of Observations # of Exceedances % Exceedance Season Winter 114 24 21.0% Spring 109 34 31.2% Summer 90 37 41.1% Fall 110 29 26.4%



### Florida Department of Environmental Protection 40Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



# Chapter 6: DETERMINATION OF THE TMDL

6.1 Expression and Allocation of the TMDL The objective of a TMDL is to provide a basis for allocating acceptable loads among all of the known pollutant sources in a watershed so that appropriate control measures can be implemented and water quality standards achieved. A TMDL is expressed as the sum of all point source loads (Wasteload Allocations, or WLAs), nonpoint source loads (Load Allocations, or LAs), and an appropriate margin of safety (MOS), which takes into account any uncertainty concerning the relationship between effluent limitations and water quality:

TMDL = ∑

 WLAs + ∑

 LAs + MOS As discussed earlier, the WLA is broken out into separate subcategories for wastewater discharges and stormwater discharges regulated under the NPDES Program:

TMDL ≅ ∑

 WLAs wastewater 

### + ∑

 WLAs NPDES Stormwater 

### + ∑

 LAs + MOS It should be noted that the various components of the revised TMDL equation may not sum up to the value of the TMDL because (a) the WLA for NPDES stormwater is typically based on the percent reduction needed for nonpoint sources and is also accounted for within the LA, and (b) TMDL components can be expressed in different term s (for example, the WLA for stormwater is typically expressed as a percent reduction, and the WLA for wastewater is typically expressed as mass per day). WLAs for stormwater discharges are typically expressed as “percent reduction” because it is very difficult to quantify the loads from MS4s (given the numerous discharge points) and to distinguish loads from MS4s from other nonpoint sources (given the nature of stormwater transport). The permitting of stormwater discharges also differs from the permitting of most wastewater point sources. Because stormwater discharges cannot be centrally collected, monitored, and treated, they are not subject to the same types of effluent limitations as wastewater facilities, and instead are required to meet a performance standard of providing treatment to the “maximum extent practi cal” through the implementation of BMPs. This approach is consistent with federal regulations (40 CFR § 130.2[I]), which state that TMDLs can be expressed in terms of mass per time (e.g., pounds per day), toxicity, or other appropriate measure . TMDLs for Spruce Creek are expressed in terms of a percent reduction in total phosphorus, to meet both the DO and nutrient criteria ( Table 6.1 )

.

Florida Department of Environmental Protection 41Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



### Table 6.1. TMDL Components for Spruce Creek

WLA

WBID Parameter TMDL (mg/L) Wastewater (mg/L) NPDES Stormwater (% Reduction) 1 LA (% Reduction) 1 MOS

2674A TP 0.16 N/A 27% 27% Implicit

2674A BOD 2.17 NA 25% 25% Implicit

1 As the TMDL represents a percent reduction, it also complies with EPA requirements to express the TMDL on a daily basis.



## 6.2 Load Allocation A TP reduction of 27 percent and a 25 percent reduction in BOD are required from nonpoint sources. It should be noted that the load allocation includes loading from stormwater discharges that are not part of the NPDES Stormwater Program.



## 6.3 Wasteload Allocation 6.3.1 NPDES Wastewater Discharges There are currently no permitted NPDES discharges in the Spruce Creek watershed; however, any future discharge permits issued in the watershed will also be required to meet the state’s Class III criterion for DO and contain appropriate discharge limitations on phosphorus that will comply with the TMDL as well as existing state requirements related to discharges to OFWs.



## 6.3.2 NPDES Stormwater Discharges Volusia County (FLR04E033), Port Orange (FLR04E014), Ponce Inlet (FLR04E071), and New Smyrna Beach (FLR04E035) have Phase II MS4 permits that may include portions of the Spruce Creek watershed and would be responsible for a 27 percent reduction in current anthropogenic TP loading and a 25 percent reduction in current anthropogenic BOD loading. It should be noted that any MS4 permittee is only responsible for reducing the loads associated with stormwater outfalls that it owns or otherwise has responsible control over, and it is not responsible for reducing other nonpoint source loads in its jurisdiction.



## 6.4 Margin of Safety Consistent with the recommendations of the Allocation Technical Advisory Committee (Department, 2001), an implicit MOS was used in t he development of this TMDL. An MOS was included in the TMDL by not allowing any exceedances of the state criteria, even though intermittent natural exceedances of the criteria would be expected and would be taken into account when determining impairment. Additionally, the TMDL calculated for DO was based on meeting a DO of 5.0 mg/L, rather than the marine minimum of 4.0 mg/L.

Florida Department of Environmental Protection 42Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



# Chapter 7: NEXT STEPS: IMPLEMENTATION PLAN DEVELOPMENT AND BEYOND

7.1 Basin Management Action Plan Following the adoption of this TMDL by rule, the next step in the TMDL process is to develop an implementation plan for the TMDL, referred to as the BMAP. This document will be developed over the next year in cooperation with local stakeholders, who will attempt to reach consensus on detailed allocations and on how load reductions will be accomplished. The BMAP will include, among other things:

• Appropriate load reduction allocations among the affected parties,

• A description of the load reduction activities to be undertaken, including structural projects, nonstructural BMPs, and public education and outreach,

• A description of further research, data collection, or source identification needed in order to achieve the TMDL,

• Timetables for implementation,

• Confirmed and potential funding mechanisms,

• Any applicable signed agreement(s),

• Local ordinances defining actions to be taken or prohibited,

• Any applicable local water quality standards, permits, or load limitation agreements,

• Milestones for implementation and water quality improvement, and

• Implementation tracking, water quality monitoring, and follow-up measures.

An assessment of progress toward the BMAP milestones will be conducted every five years, and revisions to the plan will be made as appropriate, in cooperation with basin stakeholders. Earlier in the document a Spruce Creek/Rose Bay Watershed Master Plan (Volusia County, 1996) was referenced, along with current plans for the county to update the document. Implementation measures that reduce stormwater impacts to both water quantity and water quality in the Spruce Creek watershed should be recognized in the BMAP. In addition, as noted in Chapter 5, the relationship develo ped between BOD and DO was based on measurements collected in a single year. Additional moni toring as part of the BMAP could improve the understanding of sources of BOD from the contributing watershed and impacts on DO. Chapter 4 summarized potential contributions of TN and TP from various sources in WBID 2674A and the upstream portion of Spruce Creek (WBID 2674). Elements of the BMAP can also focus efforts to better quantify the actual loads from the sources identified as well as evaluate contributions from the drainage area outside the two Spruce Creek WBIDs. As noted in Chapter 5, the USGS gage located on Spruce Creek near the railroad bridge (Gage 02248053) had an estimated drainage area of 60.7 square miles and was tidally influenced.

Florida Department of Environmental Protection 43Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



### Florida Department of Environmental Protection 44 

# References

Florida Administrative Code. Rule 62-302, Surface water quality standards.

———. Rule 62-303, Identification of impaired surface waters. Florida Department of Environmental Protection. February 2001. A report to the Governor and the Legislature on the allocation of Total Maximum Daily Loads in Florida. Tallahassee, Florida: Bureau of Watershed Management.

———. 2005. Upper East Coast Basin status report. Tallahassee, Florida. Available: http://www.dep.state.fl.us/water/basin411/uppereast/status.htm

. Florida Department of Health Website. 2006. Available: http://www.doh.state.fl.us/

. ———. 2006. Available: http://www.doh.state.fl.us/environment/O STDS/statistics/newInstallations.pdf

. ———. 2006. Available: http://www.doh.state.fl.us/environment/OSTDS/statistics/repairs.pdf

. Florida Watershed Restoration Act. Chapter 99-223, Laws of Florida. Harper, H.H., and D.M. Baker. 2003. Evaluation of alternative stormwater regulations for southwest Florida. Orlando, Florida: Environmental Research & Design, Inc.

U. S. Census Bureau Website. 2000. Available: http://www.census.gov/

. U. S. Environmental Protection Agency. 1999. Protocol for developing nutrient TMDLs. First Edition. EPA 841–B–99–007.

———. June 2001. BASINS Version 3.0 user manual. Office of Water. Available: http://www.epa.gov/waterscience/basins/bsnsdocs.html

. U. S. Environmental Protection Agency Region 4. 2002. Estimating water quality loadings from MS4 areas. Volusia County. April 1996. Spruce Creek/Rose Bay OFW watershed master plan. Prepared by Marshall, Provost & Associates.Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



# Appendices

Appendix A: Background Information on Federal and State Stormwater Programs In 1982, Florida became the first state in the country to implement statewide regulations to address the issue of nonpoint source pollution by requiring new development and redevelopment to treat stormwater before it is discharged. The Stormwater Rule, as authorized in Chapter 403, F.S., was established as a technology-based program that relies on the implementation of BMPs that are designed to achieve a specific level of treatment (i.e., performance standards) as set forth in Rule 62-40, F.A.C. In 1994, the Department’s stormwater treatment requirements were integrated with the stormwater flood control requirements of the water management districts, along with wetland protection requirements, into the Environmental Resource Permit regulations. Rule 62-40 also requires the state’s water management districts to establish stormwater pollutant load reduction goals (PLRGs) and adopt them as part of a Surface Water Improvement and Management (SWIM) plan, other watershed plan, or rule. Stormwater PLRGs are a major component of the load allocation part of a TMDL. To date, stormwater PLRGs have been established for Tampa Bay, Lake Thonotosassa, the Winter Haven Chain of Lakes, the Everglades, Lake Okeechobee, and Lake Apopka. In 1987, the U.S. Congress established Section 402(p) as part of the federal Clean Water Act Reauthorization. This section of the law amended the scope of the federal NPDES permitting program to designate certain stormwater discharges as “point sources” of pollution. The EPA promulgated regulations and began implementing t he Phase I NPDES stormwater program in 1990. These stormwater discharges include certain discharges that are associated with industrial activities designated by specific standard industr ial classification (SIC) codes, construction sites disturbing 5 or more acres of land, and master drainage systems of local governments with a population above 100,000, which are better known as MS4s. However, because the master drainage systems of most local governments in Florida are interconnected, the EPA implemented Phase I of the MS4 permitting program on a countywide basis, which brought in all cities (incorporated areas), Chapter 298 urban water control districts, and the Florida Department of Transportation throughout the 15 counties meeti ng the population criteria. The Department received authorization to implement the NPDES stormwater program in 2000. An important difference between the federal NPDES and the state’s stormwater/environmental resource permitting programs is that the NPDES Program covers both new and existing discharges, while the state’s program focus on new discharges only. Additionally, Phase II of the NPDES Program, implemented in 2003, expands the need for these permits to construction sites between 1 and 5 acres, and to local governments with as few as 1,000 people. While these urban stormwater discharges are now technically referred to as “point sources” for the purpose of regulation, they are still diffuse sources of pollution that cannot be easily collected and treated by a central treatment facility, as are other point sources of pollution such as domestic and industrial wastewater discharges. It should be noted that all MS4 permits issued in Florida include a reopener clause that allows permit revisions to implement TMDLs when the implementation plan is formally adopted.

Florida Department of Environmental Protection 45Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



## Appendix B: Historical DO, Correct ed Chla, TN, and TP Observations in Spruce Creek, 1991–2006

Station Sample Date DO (mg/L) DOSAT (%) Corr Chla ( μ g/L) TN (mg/L) TP (mg/L)

VEMDSC04 12/2/1991 1.3 14.1304 25.8 0.92 0.13 VEMDSC05 12/2/1991 1. 8 20.4545 1 0.91 0.14 VEMDSC02 12/2/1991 6. 8 80 7.8 1.18 0.13 VEMDSC01 12/2/1991 7.33 87.2619 8.7 1.14 0.13 VEMDSC05 1/6/1992 0. 37 3.9697 0.63 0.21 VEMDSC04 1/6/1992 3. 08 31.7525 0.8 0.14 VEMDSC02 1/6/1992 8. 01 78.5294 2.01 0.05 VEMDSC01 1/6/1992 8.37 83.7 1 0.09 VEMDSC05 2/3/1992 1.78 18.7368 4.7 2.76 0.15 VEMDSC04 2/3/1992 2.79 28.7628 27.6 1.12 0.14 VEMDSC02 2/3/1992 7. 94 79.4 1.8 0.08 VEMDSC01 2/3/1992 9. 31 93.1 1 1.63 0.07 VEMDSC04 3/2/1992 2. 91 30.6315 1 1.41 0.19 VEMDSC05 3/2/1992 5. 15 53.0928 1 1.03 0.22 VEMDSC02 3/2/1992 8. 09 86.0638 2 1.4 0.12 VEMDSC01 3/2/1992 9.77 103.936 1.6 2.22 0.13 VEMDSC05 4/6/1992 0. 2 2.22222 7.1 0.27 VEMDSC04 4/6/1992 2.58 28.6666 3.5 1.14 0.18 VEMDSC01 4/6/1992 6. 98 74.2553 3 0.09 VEMDSC02 4/6/1992 7. 04 74.8936 5.9 0.12 VEMDSC05 5/4/1992 0. 3 3.44827 1.23 0.25 VEMDSC04 5/4/1992 1. 8 21.1765 2.58 0.24 VEMDSC02 5/4/1992 5. 9 69.4117 0.22 VEMDSC01 5/4/1992 6. 2 71.2643 0.15 SJWMSPRCR 5/28/1992 5. 1 75.9018 0.612 0.097

VEMDSC05 6/1/1992 0.19 2.2619 6.9 0.91 0.25 VEMDSC04 6/1/1992 1.21 14.9383 11.8 1.15 0.16 VEMDSC02 6/1/1992 5. 2 65.8228 11.3 0.14 VEMDSC01 6/1/1992 6. 06 76.7088 4.7 0.07 VEMDSC05 7/6/1992 0. 15 1.85185 1.9 VEMDSC04 7/6/1992 2.06 25.4321 4.9 1.58 0.22 VEMDSC02 7/6/1992 4.13 55.0666 9.5 1.21 0.19 VEMDSC01 7/6/1992 5.06 68.3783 9.2 1.29 0.19 SJWMUEC014 7/22/1992 1. 7 20.9876 25.527

VEMDSC04 8/3/1992 0. 14 1.8421 10.6 VEMDSC05 8/3/1992 3.03 36.0714 1.1 1.33 0.27 VEMDSC01 8/3/1992 4.14 53.0769 5.6 1.86 0.26



### Florida Department of Environmental Protection 46Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients

Corr Chla DO DOSAT TN TP Station Sample Date



### Florida Department of Environmental Protection 47 (mg/L) (%) ( μ g/L) (mg/L) (mg/L)

VEMDSC02 8/3/1992 5. 4 71.0526 11.7 0.35 VEMDSC04 9/9/1992 3.07 36.5476 1.7 1.38 0.1 VEMDSC04 9/9/1992 3. 1 38 1.7 1.36 0.1 VEMDSC05 9/9/1992 4. 25 50.5952 1 1.51 0.06 VEMDSC05 9/9/1992 4. 3 52.1 0.1 1.56 0.06 VEMDSC02 9/9/1992 4.18 52.9114 5.2 2.45 0.17 VEMDSC02 9/9/1992 4. 2 59.5 5.2 2.45 0.17 VEMDSC01 9/9/1992 4.95 63.4615 5.6 3.19 0.15 VEMDSC01 9/9/1992 5 74.1 5.6 3.19 0.15 VEMDSC05 10/5/1992 4. 92 56.5517 1 0.22 VEMDSC04 10/5/1992 5. 07 59.647 1.4 1.43 VEMDSC02 10/5/1992 5.43 63.8823 1.4 1.45 0.33 VEMDSC01 10/5/1992 5.54 65.9523 3.2 1.49 0.28 VEMDSC04 11/2/1992 3.05 33.8889 1.1 1.1 0.13 VEMDSC05 11/2/1992 4. 26 47.3333 1 1.24 0.06 VEMDSC02 11/2/1992 5. 59 66.5476 4 0.13 VEMDSC01 11/2/1992 5. 94 70.7142 4 1.35 0.14 VEMDSC04 12/7/1992 5.89 57.7451 VEMDSC05 12/7/1992 6.25 61.2745 VEMDSC02 12/7/1992 7.67 79.0721 VEMDSC01 12/7/1992 8.27 87.0526 VEMDSC05 1/4/1993 2.77 30.10865 1 1.06 0.135 VEMDSC04 1/4/1993 4.41 47.9348 3.2 0.83 0.18 VEMDSC02 1/4/1993 7.36 81.7777 4.3 0.56 0.2 VEMDSC01 1/4/1993 7.54 83.7777 3.1 0.8 0.16 VEMDSC05 2/1/1993 6.51 62.59615 1 1.3335 0.031 VEMDSC04 2/1/1993 6. 92 69.2 1 1.415 0.063 VEMDSC02 2/1/1993 7. 41 76.3917 1 1.356 0.113 VEMDSC01 2/1/1993 8. 1 81 1.6 1.171 0.12 VEMDSC04 3/1/1993 7. 06 66.6037 1 1.11 0.1 VEMDSC02 3/1/1993 7.21 70.6862 1.9 1.236 0.11 VEMDSC05 3/1/1993 7. 51 72.2115 1 1.125 0.09 VEMDSC01 3/1/1993 8.75 85.7843 1.4 1.22 0.1 VEMDSC04 4/5/1993 4. 58 48.7234 1.42 0.132 VEMDSC02 4/5/1993 5. 86 65.1111 0.688 0.149 VEMDSC01 4/5/1993 6. 87 76.3333 0.463 0.129 VEMDSC05 4/5/1993 7.66 81.48935 1.4015 0.102 VEMDSC04 5/4/1993 4. 58 48.7234 11 1.855 0.69 VEMDSC02 5/4/1993 5.86 65.1111 3.8 1.252 0.12 VEMDSC01 5/4/1993 6.87 76.3333 3.6 1.213 0.1 VEMDSC05 5/4/1993 7.66 81.48935 44.2 0.963 0.125Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients

Corr Chla DO DOSAT TN TP Station Sample Date



### Florida Department of Environmental Protection 48 (mg/L) (%) ( μ g/L) (mg/L) (mg/L)

SJWMUEC014 5/19/1993 6.4 81.1523 6.148

VEMDSC04 6/8/1993 0. 54 6.92307 7 0.969 0.3 VEMDSC05 6/8/1993 3.51 42.80485 9.25 1.058 0.3 VEMDSC01 6/8/1993 4.43 56.7948 3.5 1.972 0.14 VEMDSC02 6/8/1993 4.63 60.921 6.2 1.441 0.21 SJWMUEC014 6/16/1993 2. 7 36.0269 2.94 0.567

VEMDSC04 7/7/1993 0. 22 3.2 10.9 0.777 0.23 VEMDSC05 7/7/1993 0. 31 4.1 19.5 1.014 0.26 VEMDSC01 7/7/1993 3. 69 58.7 3.5 1.678 0.27 VEMDSC02 7/7/1993 4. 57 70 8.9 1.176 0.16 SJWMUEC014 7/14/1993 4. 4 57.7913 21.5 1.16

VEMDSC04 8/2/1993 2. 53 33.5 81.6 1.292 0.4 VEMDSC05 8/2/1993 3. 79 47.1 2.3 1.085 0.28 VEMDSC02 8/2/1993 4. 51 69.7 8.6 1.381 0.18 VEMDSC01 8/2/1993 4. 66 74.3 4.5 2.055 0.11 SJWMUEC014 8/25/1993 2.2 27.7413 1.189

VEMDSC04 9/8/1993 0. 22 3 5.9 0.686 0.66 VEMDSC05 9/8/1993 3. 14 38.2 3.3 0.797 VEMDSC01 9/8/1993 4. 03 61.1 6.6 0.504 0.08 VEMDSC02 9/8/1993 4. 33 62.7 13.4 0.724 0.078 VEMDSC04 10/4/1993 0. 44 5.9 36.3 1.186 0.24 VEMDSC05 10/4/1993 2. 52 29.7 2.7 0.832 0.22 VEMDSC02 10/4/1993 5. 28 76.8 5.5 1.198 0.17 VEMDSC01 10/4/1993 5. 87 88.5 5.2 1.632 0.12 VEMDSC04 11/1/1993 1. 33 16.4 0.4 0.857 0.16 VEMDSC05 11/1/1993 4. 54 46.5 0.3 1.342 0.23 VEMDSC02 11/1/1993 6. 22 73.7 8.6 1.333 0.13 VEMDSC01 11/1/1993 6. 54 85.4 3.7 1.206 0.09 VEMDSC04 12/6/1993 1. 34 15.8 12.7 0.936 0.13 VEMDSC05 12/6/1993 1. 59 18.5 0.5 0.805 0.15 VEMDSC02 12/6/1993 6. 05 73.7 7.9 1.161 0.1 VEMDSC01 12/6/1993 6. 53 83.7 1.9 1.411 0.07 VEMDSC04 1/3/1994 3. 66 36.6 2.12 1.269 0.3 VEMDSC05 1/3/1994 5.565 57.3711 2.54 1.3375 0.375 VEMDSC01 1/3/1994 7.52 77.5257 2.08 1.281 0.07 VEMDSC02 1/3/1994 8.28 85.3608 26.38 1.002 0.1 VEMDSC04 2/7/1994 5. 41 54.1 1 1.76 0.15 VEMDSC05 2/7/1994 5. 61 57.835 1 1.672 0.13 VEMDSC02 2/7/1994 6.27 66.70205 2.36 1.836 0.14 VEMDSC01 2/7/1994 7.35 77.3684 3.05 1.845 0.11 VEMDSC01 3/7/1994 3.33 1.628 0.08Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients

Corr Chla DO DOSAT TN TP Station Sample Date



### Florida Department of Environmental Protection 49 (mg/L) (%) ( μ g/L) (mg/L) (mg/L)

VEMDSC02 3/7/1994 2.345 1.677 0.12 VEMDSC04 3/7/1994 1 1.675 0.09 VEMDSC05 3/7/1994 1 1.763 0.06 VEMDSC05 4/4/1994 3. 02 32.5 0.5 1.048 0.17 VEMDSC04 4/4/1994 4. 56 52.8 5.4 1.346 0.22 VEMDSC02 4/4/1994 5. 62 72.6 2.3 1.883 0.12 VEMDSC01 4/4/1994 5. 96 78.4 2 2.071 0.11 VEMDSC01 5/2/1994 3.19 1.483 0.17 VEMDSC02 5/2/1994 8.73 1.0705 0.245 VEMDSC04 5/2/1994 21.3 1.019 0.27 VEMDSC05 5/2/1994 23.91 1.005 0.36 VEMDSC04 6/6/1994 1.1 13.924 6.32 0.841 0.38 VEMDSC05 6/6/1994 2.68 31.5294 1.85 1.41 0.28 VEMDSC02 6/6/1994 5.05 66. 44735 10.455 1.982 0.205 VEMDSC01 6/6/1994 5.99 78.8158 7.35 1.481 0.15 VEMDSC04 7/6/1994 3.4 40.4762 5.92 1.914 0.17 VEMDSC05 7/6/1994 4. 3 51.1904 1 2.172 0.16 VEMDSC02 7/6/1994 4.42 56.6666 9.86 1.578 0.23 VEMDSC01 7/6/1994 4.91 62.9487 5.9 1.439 0.15 VEMDSC01 8/1/1994 10.39 VEMDSC02 8/1/1994 44.785 1.7185 0.265 VEMDSC04 8/1/1994 1 2.294 0.61 VEMDSC05 8/1/1994 1 2.349 0.53 VEMDSC04 9/6/1994 3. 44 40.9523 1 2.04 0.22 VEMDSC05 9/6/1994 4.26 50.1176 1.24 1.94 0.19 VEMDSC02 9/6/1994 4.37 53.9506 3.49 0.952 0.15 VEMDSC01 9/6/1994 5.49 69.4936 5.19 0.478 0.09 VEMDSC04 10/3/1994 4. 25 50.5952 1 2.717 0.19 VEMDSC05 10/3/1994 4.715 56.1309 1 2.4305 0.22 VEMDSC02 10/3/1994 5.31 64.7561 3.61 1.526 0.29 VEMDSC01 10/3/1994 5.61 68.4146 3.45 1.643 0.16 VEMDSC04 11/1/1994 4.285 49.2528 1.765 1.746 0.625 VEMDSC02 11/1/1994 4.55 54.1666 1.77 1.226 0.25 VEMDSC05 11/1/1994 4.92 56.5517 1.01 3.648 0.42 VEMDSC01 11/1/1994 5.19 61.7857 2.87 0.944 0.19 VEMDSC04 12/5/1994 3. 87 43 1.78 0.872 0.17 VEMDSC05 12/5/1994 4. 55 50.5555 1 1.145 0.15 VEMDSC02 12/5/1994 5. 22 60 1.37 1.163 0.14 VEMDSC01 12/5/1994 6.29 72.2988 5.68 0.949 0.11 VEMDSC04 1/9/1995 6.24 60 1 1.448 0.2 VEMDSC05 1/9/1995 6. 79 64.0566 1 1.519 0.07Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients

Corr Chla DO DOSAT TN TP Station Sample Date



### Florida Department of Environmental Protection 50 (mg/L) (%) ( μ g/L) (mg/L) (mg/L)

VEMDSC02 1/9/1995 6.59 64.6078 1.15 1.054 0.14 VEMDSC01 1/9/1995 7.6 73.0769 3.79 0.801 0.12 VEMDSC04 2/6/1995 2. 98 29.8 1 1.071 0.08 VEMDSC05 2/6/1995 5. 65 54.3269 1 0.918 0.07 VEMDSC01 2/6/1995 7.9 73.1481 1.73 0.542 0.08 VEMDSC02 2/6/1995 8.14 76.7924 3.63 0.848 0.09 VEMDSC05 3/6/1995 3.21 34.1489 3.475 1.016 0.12 VEMDSC04 3/6/1995 3.9 41.4893 13.19 0.851 0.13 VEMDSC01 3/6/1995 5.9 64.1304 2.43 0.555 0.1 VEMDSC02 3/6/1995 6.5 72.2222 5.43 0.626 0.07 VEMDSC05 4/3/1995 3. 71 38.2474 1 1.239 0.12 VEMDSC04 4/3/1995 4.05 42.6315 4.77 0.949 0.16 VEMDSC01 4/3/1995 6.2 65.9574 1.85 0.397 0.11 VEMDSC02 4/3/1995 6.075 66.03255 3.435 0.584 0.11 VEMDSC04 5/1/1995 2.1 25.6097 20.08 0.572 0.34 VEMDSC05 5/1/1995 2.8 32.1839 8.05 0.872 0.13 VEMDSC01 5/1/1995 4.72 57.5609 3.21 0.576 0.23 VEMDSC02 5/1/1995 5.24 64.6913 5.16 0.422 0.22 VEMDSC04 6/5/1995 1.45 15.2791 9.06 1.1025 0.275 VEMDSC05 6/5/1995 4.7 55.9523 3.76 0.93 0.26 VEMDSC02 6/5/1995 5.5 69.6203 10.38 1.048 0.2 VEMDSC01 6/5/1995 6.4 79.0123 6.59 0.56 0.32 VEMDSC04 7/10/1995 2.17 27.8205 23.32 1.1755 0.32 VEMDSC05 7/10/1995 3. 12 39.4936 41.42 VEMDSC01 7/10/1995 4.88 62.5641 3.58 0.068 0.16 VEMDSC02 7/10/1995 4.97 65.3947 5.96 0.096 0.2 VEMDSC04 8/7/1995 3. 23 39.8765 1 1.782 0.14 VEMDSC05 8/7/1995 3. 94 48.0488 1 1.922 0.2 VEMDSC02 8/7/1995 4.3 56.5789 26.41 1.939 0.24 VEMDSC01 8/7/1995 4.31 57.4666 5.78 1.229 0.25 VEMDSC01 9/5/1995 3.87 1.334 0.2 VEMDSC02 9/5/1995 1 1.507 0.22 VEMDSC04 9/5/1995 1 1.6725 0.255 VEMDSC05 9/5/1995 1.77 1.862 0.2 VEMDSC04 10/2/1995 3. 8 46.9135 1.457 0.17 VEMDSC02 10/2/1995 4. 3 54.4303 1.429 0.23 VEMDSC05 10/2/1995 4. 6 56.7901 1.585 0.14 VEMDSC01 10/2/1995 5. 1 64.5569 1.368 0.19 VEMDSC04 11/6/1995 3.32 37.7272 1.01 1.38 0.08 VEMDSC05 11/6/1995 4.15 46.1111 1.64 1.39 0.05 VEMDSC02 11/6/1995 6.03 69.3103 3.2 0.862 0.25Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients

Corr Chla DO DOSAT TN TP Station Sample Date



### Florida Department of Environmental Protection 51 (mg/L) (%) ( μ g/L) (mg/L) (mg/L)

VEMDSC01 11/6/1995 6.42 75.5294 4.57 0.595 0.3 VEMDSC04 12/4/1995 2.75 29.2553 3.12 0.764 0.14 VEMDSC01 12/4/1995 7.17 81.4772 2.85 0.714 0.16 VEMDSC02 12/4/1995 1 0.908 0.16 VEMDSC04 1/8/1996 7.67 69.45945 1 1.201 0.07 VEMDSC05 1/8/1996 7. 99 70.7079 1 1.174 0.07 VEMDSC02 1/8/1996 8.36 73.9823 2.72 1.128 0.08 VEMDSC01 1/8/1996 8.76 81.1111 8.3 0.683 0.15 VEMDSC04 2/5/1996 5. 85 55.1886 1 1.491 0.24 VEMDSC05 2/5/1996 6. 8 61.2612 1 1.326 0.11 VEMDSC02 2/5/1996 8.155 73.46845 2.31 0.824 0.14 VEMDSC01 2/5/1996 8.44 76.036 2.42 0.622 0.11 VEMDSC05 3/4/1996 4.97 49.1784 1.365 1.32 0.15 VEMDSC04 3/4/1996 5. 54 55.4 2.99 2.22 0.41 VEMDSC02 3/4/1996 7.1 74.7368 1.85 0.645 0.14 VEMDSC01 3/4/1996 7.55 79.4736 1.81 0.483 0.2 VEMDSC05 4/1/1996 5.325 57.8804 1.76 1.007 0.165 VEMDSC02 4/1/1996 5.37 58.3695 1.54 0.986 0.24 VEMDSC04 4/1/1996 5.59 60.7608 1.07 1.01 0.22 VEMDSC01 4/1/1996 6.07 68.9772 2.12 0.522 0.34 VEMDSC05 5/6/1996 4.02 46.2069 10.33 1.026 0.12 VEMDSC04 5/6/1996 5.035 61.4024 74.98 1.139 0.175 VEMDSC01 5/6/1996 5. 33 65 2.19 0.355 0.13 VEMDSC02 5/6/1996 5.86 75.1282 3.52 0.482 0.1 VEMDSC05 6/3/1996 1.8 20.9317 232.985 0.413 0.08 VEMDSC04 6/3/1996 4.46 54.3902 12.4 0.476 0.1 VEMDSC02 6/3/1996 5.17 63.0488 3.37 0.309 0.33 VEMDSC01 6/3/1996 5.41 64.4047 2.49 0.322 0.23 VEMDSC02 7/8/1996 3.89 48.0247 6.89 1.328 0.4 VEMDSC01 7/8/1996 3.92 48.395 1.67 0.94 0.2 VEMDSC04 7/8/1996 4.59 54.6428 2.19 1.352 0.34 VEMDSC05 7/8/1996 5.04 59. 99995 1.705 1.4835 0.235 VEMDSC01 8/5/1996 3.8 0.477 0.16 VEMDSC02 8/5/1996 2.62 0.529 0.13 VEMDSC04 8/5/1996 61.13 0.612 0.17 VEMDSC05 8/5/1996 21.2 0.794 0.125 VEMDSC04 9/3/1996 0.52 6.58228 31.15 0.661 0.26 VEMDSC05 9/3/1996 1.9 22.619 4.35 0.858 0.15 VEMDSC01 9/3/1996 4. 94 65 4.97 0.62 0.17 VEMDSC02 9/3/1996 5.06 66.5789 7.9 0.603 0.13 VEMDSC02 10/7/1996 4.96 58.3529 2.26 0.977 0.29Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients

Station Sample Date DO (mg/L) DOSAT (%) Corr Chla ( μ g/L) TN (mg/L) TP (mg/L)

VEMDSC01 10/7/1996 5.03 59.1764 2.56 0.641 0.23 VEMDSC04 10/7/1996 5.33 61.2643 1.95 1.276 0.53 VEMDSC05 10/7/1996 5.77 66.3218 1.09 1.319 0.43 VEMDSC04 11/4/1996 2. 79 31.7045 1 0.949 0.12 VEMDSC05 11/4/1996 3. 59 39.0217 1 1.044 0.08 VEMDSC02 11/4/1996 6.43 73.0681 2.38 0.874 0.12 VEMDSC01 11/4/1996 6.82 75.7777 2.55 0.665 0.13 VEMDSC05 12/2/1996 2. 75 29.2553 1 0.475 0.11 VEMDSC04 12/2/1996 3.05 33.1521 1.99 0.58 0.11 VEMDSC02 12/2/1996 7.23 80.3333 5.42 0.601 0.12 VEMDSC01 12/2/1996 7.69 83.5869 14.35 0.43 0.1 VEMDSC04 1/6/1997 0.69 7.66666 1.14 0.59 0.12 VEMDSC05 1/6/1997 2. 72 28.9361 1 0.425 0.2 VEMDSC02 1/6/1997 5.51 61.2222 4.14 0.357 0.12 VEMDSC01 1/6/1997 7.07 78.5555 2.82 0.298 0.22 VEMDSC05 2/3/1997 0.295 3.138295 1.035 0.597 0.095 VEMDSC04 2/3/1997 0.32 3.40425 1.54 0.876 0.2 VEMDSC02 2/3/1997 7.56 79.5789 3.24 0.588 0.1 VEMDSC01 2/3/1997 9.99 105.158 1.26 0.416 0.1 VEMDSC05 3/3/1997 0.57 6.47727 11.11 0.648 0.11 VEMDSC04 3/3/1997 0. 7 8.04597 3.06 VEMDSC02 3/3/1997 6.66 79.2857 5.23 0.488 0.12 VEMDSC01 3/3/1997 7.45 87.647 3.96 0.454 0.17 VEMDSC05 4/7/1997 0.72 8.47059 22.18 0.583 0.2 VEMDSC02 4/7/1997 5.075 58.3333 3.16 0.502 0.17 VEMDSC04 4/7/1997 5.12 60.2353 10.94 0.703 0.17 VEMDSC01 4/7/1997 7.32 84.1379 1.97 0.411 0.12 VEMDSC01 5/5/1997 4.34 0.467 0.12 VEMDSC02 5/5/1997 4.01 0.5035 0.115 VEMDSC04 5/5/1997 3.61 0.466 0.14 VEMDSC05 5/5/1997 8.08 0.459 0.14 VEMDSC05 6/2/1997 0.61 7.17647 1.44 0.664 0.17 VEMDSC04 6/2/1997 4. 77 56.1176 0.628 0.19 VEMDSC02 6/2/1997 4.805 58. 59755 5.525 0.5415 0.135 VEMDSC01 6/2/1997 5.88 71.7073 3.86 0.47 0.12 VEMDSC04 7/7/1997 1. 43 17.6543 1 0.77 0.21 VEMDSC05 7/7/1997 2. 42 28.4706 1 1.685 0.35 VEMDSC01 7/7/1997 5.04 66.3158 1.84 0.644 0.12 VEMDSC02 7/7/1997 5.065 66.6447 2.2 0.621 0.145 VEMDSC05 8/4/1997 3. 65 43.4523 1 1.586 0.21 VEMDSC01 8/4/1997 6.62 0.714 0.13



### Florida Department of Environmental Protection 52Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients

Station Sample Date DO (mg/L) DOSAT (%) Corr Chla ( μ g/L) TN (mg/L) TP (mg/L)

VEMDSC02 8/4/1997 10.19 0.713 0.145 VEMDSC04 8/4/1997 3.84 1.312 0.21 VEMDSC04 9/8/1997 3. 24 38.1176 1 1.238 0.22 VEMDSC02 9/8/1997 3.59 43.7805 6.02 1.169 0.21 VEMDSC05 9/8/1997 3. 89 45.7647 1 1.249 0.18 VEMDSC01 9/8/1997 4.42 0.764 0.13 VEMDSC04 10/6/1997 0.24 2.92683 9.29 0.919 0.19 VEMDSC05 10/6/1997 3. 12 35.862 1 0.891 0.09 VEMDSC02 10/6/1997 5.875 71.6463 3.57 0.758 0.1 VEMDSC01 10/6/1997 6.1 75.3086 3.07 0.571 0.04 VEMDSC04 11/3/1997 4. 69 52.1111 1 1.485 0.44 VEMDSC05 11/3/1997 5. 44 57.8723 1 1.156 0.27 VEMDSC02 11/3/1997 5.57 64.0229 1.96 1.254 0.26 VEMDSC01 11/3/1997 7.54 88.7058 3.32 0.716 0.15 VEMDSC04 12/1/1997 3.18 33.8298 17.29 0.823 0.14 VEMDSC05 12/1/1997 3. 63 38.617 1 0.847 0.14 VEMDSC02 12/1/1997 6. 81 72.4468 1 0.797 0.1 VEMDSC01 12/1/1997 7.08 76.9565 1.29 0.55 0.09 VEMDSC04 1/5/1998 6. 48 66.8041 1 1.057 0.12 VEMDSC05 1/5/1998 6. 85 70.6185 1 1.107 0.1 VEMDSC02 1/5/1998 6.89 72.5263 1.01 1.091 0.11 VEMDSC01 1/5/1998 7.67 81.5957 2.29 1.1 0.12 VEMDSC04 2/2/1998 6. 42 62.9411 1 1.103 0.15 VEMDSC05 2/2/1998 6. 57 64.4117 1 1.096 0.11 VEMDSC02 2/2/1998 7.625 76.25 1.005 0.7125 0.07 VEMDSC01 2/2/1998 7. 79 77.9 1 0.489 0.05 VEMDSC02 3/2/1998 6. 09 64.1052 1 0.885 0.17 VEMDSC04 3/2/1998 6. 3 64.9484 1 1.079 0.2 VEMDSC05 3/2/1998 6.79 70 1 1.122 0.16 VEMDSC01 3/2/1998 7. 06 74.3158 1 0.07 VEMDSC05 4/6/1998 4. 4 46.8085 1 1.034 0.07 VEMDSC04 4/6/1998 4.3 47.7777 3.58 0.901 0.08 VEMDSC02 4/6/1998 4. 4 48.8889 3 0.6 0.13 VEMDSC01 4/6/1998 7 79.5455 2.44 0.418 0.1 VEMDSC01 5/4/1998 2.63 0.563 0.1 VEMDSC02 5/4/1998 3.45 0.11 VEMDSC04 5/4/1998 0.551 0.1 VEMDSC05 5/4/1998 5.52 0.692 0.19 VEMDSC04 6/1/1998 1.57 20.1282 9.46 0.502 0.17 VEMDSC05 6/1/1998 2.22 27.4074 8.02 0.794 0.51 VEMDSC02 6/1/1998 5.36 70.5263 3.81 0.517 0.15



### Florida Department of Environmental Protection 53Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients

Station Sample Date DO (mg/L) DOSAT (%) Corr Chla ( μ g/L) TN (mg/L) TP (mg/L)

VEMDSC01 6/1/1998 5.95 78.2894 4.6 0.461 0.13 VEMDSC05 7/6/1998 0.15 1.97368 8.41 1.128 0.64 VEMDSC04 7/6/1998 0. 85 11.3333 11.58 0.43 VEMDSC02 7/6/1998 4.7 62.6666 5.66 0.521 0.18 VEMDSC01 7/6/1998 5.505 73.4 3.82 0.4845 0.175 VEMDSC04 8/3/1998 0.07 0.933333 48.48 1.468 0.51 VEMDSC05 8/3/1998 1.52 18.5366 1.7 1.459 0.44 VEMDSC02 8/3/1998 4.61 60.6579 6.89 0.562 0.19 VEMDSC01 8/3/1998 6.07 79.8684 4.24 0.3368 0.14 VEMDSC04 9/8/1998 2.39 29.1463 8.09 1.2764 0.35 VEMDSC05 9/8/1998 2.84 34.6341 1 1.3095 0.24 VEMDSC02 9/8/1998 4.745 60.83335 5.04 0.595 0.165 VEMDSC01 9/8/1998 5.16 63.7037 4.13 0.2286 0.08 VEMDSC04 10/5/1998 4. 02 49.0244 1.27 VEMDSC05 10/5/1998 4.27 52.0731 1 VEMDSC02 10/5/1998 4. 3 54.4303 4.15 VEMDSC01 10/5/1998 4. 9 62.8205 4.45 VEMDSC01 10/6/1998 0.11 VEMDSC02 10/6/1998 0.18 VEMDSC04 10/6/1998 0.24 VEMDSC05 10/6/1998 0.23 VEMDSC04 11/2/1998 3.68 40.8889 4.89 1.102 0.17 VEMDSC05 11/2/1998 3. 97 44.1111 1 1.335 0.17 VEMDSC02 11/2/1998 5.01 59.6428 2.89 0.723 0.09 VEMDSC01 11/2/1998 5.63 67.0238 4.33 0.53 0.09 VEMDSC05 12/2/1998 0.35 3.88889 1.3 0.827 0.18 VEMDSC04 12/2/1998 3.68 40.8889 263.06 0.723 0.14 VEMDSC02 12/2/1998 6.6 75.862 3.73 0.368 0.12 VEMDSC01 12/2/1998 6.55 77.0588 3.92 0.304 0.1 VEMDVC-074 1/4/1999 3. 57 37.90316 1 0.527 0.14 VEMDVC-073 1/4/1999 3. 26 39.8186 2.285 0.462 0.11 VEMDVC-072 1/4/1999 6.64 87.66389 1.28 0.306 0.1 VEMDVC-071 1/4/1999 7. 27 93.1 3.2 0.487 0.01 VEMDVC-074 2/1/1999 3.05 35.83873 1.11 0.813 0.18 VEMDVC-073 2/1/1999 4.18 51.94915 2.88 0.675 0.13 VEMDVC-071 2/1/1999 5. 63 74.6 2.2 0.253 0.1 VEMDVC-072 2/1/1999 5. 71 83.02783 0.229 0.17 VEMDVC-074 3/1/1999 1. 83 22.47503 1 0.657 0.14 VEMDVC-073 3/1/1999 6.03 72.57485 6.04 0.704 0.12 VEMDVC-071 3/1/1999 8. 31 102.7 1.1 0.242 0.12 VEMDVC-072 3/1/1999 8. 31 113.2818 1.73 0.256 0.4



### Florida Department of Environmental Protection 54Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients

Station Sample Date DO (mg/L) DOSAT (%) Corr Chla ( μ g/L) TN (mg/L) TP (mg/L)

VEMDVC-072 4/5/1999 5. 27 84.6 2.76 0.447 0.1 VEMDVC-071 4/5/1999 6. 35 94.3 3.3 0.274 0.09 VEMDVC-073 4/5/199 9 5 0.425 0.12 VEMDVC-074 4/5/1999 3.8 0.82 0.24 VEMDVC-074 5/3/1999 1. 27 17.32478 1 0.847 0.3 VEMDVC-073 5/3/1999 1.79 24.83932 3.87 0.658 0.21 VEMDVC-071 5/3/1999 6. 48 89.5 2.6 0.338 0.19 VEMDVC-072 5/3/1999 6.4 94.93836 2.86 0.372 0.19 VEMDVC-073 6/7/1999 0.95 14.84744 12.2 0.749 0.3 VEMDVC-074 6/7/1999 1.55 22.03065 13.2 0.632 0.29 VEMDVC-072 6/7/1999 4.96 82.10178 6.7 0.594 0.17 VEMDVC-071 6/7/1999 5. 6 85.6 5.7 0.486 0.14 VEMDVC-074 7/7/1999 4.04 54.28378 1.7 1.546 0.15 VEMDVC-073 7/7/1999 4.1 56.66585 8.6 1.716 0.18 VEMDVC-071 7/7/1999 5.24 83 10.1 0.917 0.19 VEMDVC-072 7/7/1999 6. 03 93.70771 63 1.26 0.21 VEMDVC-073 8/2/1999 0.22 3.198505 5.8 1.137 0.43 VEMDVC-072 8/2/1999 4.07 70.23625 3.53 0.579 0.18 VEMDVC-071 8/2/1999 5. 39 85.8 6.6 0.416 0.14 VEMDVC-074 9/7/1999 0. 28 4.2 1.3 0.848 0.25 VEMDVC-073 9/7/1999 1. 5 22.4 3.2 0.851 0.15 VEMDVC-072 9/7/1999 4. 4 74.1 7.6 0.455 0.15 VEMDVC-071 9/7/1999 5. 11 81.1 5.5 0.417 0.16 VEMDVC-072 10/4/1999 3. 34 45.5 1.4 1.643 0.28 VEMDVC-073 10/4/1999 3. 5 47.1 1.11 1.973 0.32 VEMDVC-071 10/4/1999 4. 11 54.0 1.8 1.507 0.2 VEMDVC-074 10/4/1999 VEMDVC-074 11/1/1999 4.14 52.5 1 1.427 0.13 VEMDVC-073 11/1/1999 4.34 55.3 1 1.387 0.15 VEMDVC-072 11/1/1999 4. 46 59.2 2.5 1.283 0.19 VEMDVC-071 11/1/1999 5. 64 73.9 2.5 1.283 0.19 VEMDVC-074 12/6/1999 3.51 40.9 1 0.88 0.11 VEMDVC-073 12/6/1999 4. 37 50.0 2.7 0.91 0.15 VEMDVC-072 12/6/1999 6. 74 91.0 1.2 0.54 0.1 VEMDVC-071 12/6/1999 7. 39 94.5 1.4 0.534 0.08 VEMDVC-073 1/3/2000 2.43 28.3 1 0.81 0.09 VEMDVC-074 1/3/2000 2.89 34.4 1 0.83 0.09 VEMDVC-072 1/3/2000 6. 95 91.3 2.55 0.64 0.09 VEMDVC-071 1/3/2000 8. 14 104.3 1.66 0.397 0.07 VEMDVC-073 4/3/2000 4. 13 51.7 3.27 1.08 0.22 VEMDVC-074 4/3/2000 4. 3 53.7 1.55 1.01 0.19



### Florida Department of Environmental Protection 55Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients

Station Sample Date DO (mg/L) DOSAT (%) Corr Chla ( μ g/L) TN (mg/L) TP (mg/L)

VEMDVC-072 4/3/2000 6. 07 81.9 4.88 0.93 0.25 VEMDVC-071 4/3/2000 7. 72 102.1 7.51 0.553 0.2 VEMDVC-074 7/10/2000 0. 79 11.3 14.76 0.76 0.24 VEMDVC-073 7/10/2000 2. 74 39.8 4.43 0.66 0.24 VEMDVC-072 7/10/2000 4. 79 79.4 2.56 0.518 0.14 VEMDVC-073 10/2/2000 2. 77 36.2 4.06 1.07 0.2 VEMDVC-074 10/2/2000 3. 54 46.0 1.06 1.09 0.16 VEMDVC-072 10/2/2000 4. 49 66.2 4.72 0.76 0.14 VEMDVC-074 2/5/2001 0.01 0.1 1 0.73 0.41 VEMDVC-073 2/5/2001 0. 04 0.5 23.36 1.01 0.25 VEMDVC-072 2/5/2001 6. 85 88.9 2.05 0.46 0.08 VEMDVC-071 2/5/2001 8. 97 111.1 0.86 0.281 0.07 VEMDVC-071 5/7/2001 0. 53 7.9 3.44 0.271 0.12 VEMDVC-074 5/7/2001 0. 91 12.2 20.67 0.72 0.16 VEMDVC-073 5/7/2001 4. 92 67.3 7.5 0.59 0.16 VEMDVC-072 5/7/2001 5. 19 83.0 3.85 0.36 0.12 VEMDVC-072 8/6/2001 3. 81 51.9 7.52 1.63 0.22 VEMDVC-073 8/6/2001 4.46 59.6 1 1.77 0.31 VEMDVC-074 8/6/2001 4.76 63.1 1.55 2 0.31 VEMDVC-071 8/6/2001 4. 34 63.6 5.8 0.938 0.22 VEMDVC-073 11/5/2001 4.94 62.1 1 1.36 0.04 VEMDVC-074 11/5/2001 5.25 65.7 1 1.33 0.05 VEMDVC-072 11/5/2001 6.23 88.6 1 0.85 0.07 VEMDVC-071 11/5/2001 7. 19 103.2 1.69 0.303 0.19 VEMDVC-072 3/4/200 2 7.24 86.6 1 VEMDVC-071 3/4/2002 7. 02 86.8 0.8 0.363 0.06 VEMDVC-072 6/3/2002 4.69 80.2 6.1 VEMDVC-071 6/3/2002 5. 35 86.1 4.4 0.468 0.15 VEMDVC-071 9/9/2002 5.75 89.9 0.2 VEMDVC-072 12/2/2002 7.22 94.6 VEMDVC-071 12/2/2002 7.73 99.2 1.9 0.027 VEMDVC-074 2/3/2003 5.13 55.6 0.913 0.08 VEMDVC-073 2/3/2003 5.57 59.9 0.821 0.09 VEMDVC-071 2/3/2003 8. 48 103.9 2.58 0.316 0.1 VEMDVC-072 2/3/2003 8.5 108.0 0.536 0.08 WPB 20010738 3/12/2003 5.88 72.0 1 1.158 0.133 WPB 20010737 3/12/2003 7.505 95.2 33.39722 1.222 0.148 VEMDVC-074 5/5/2003 2.54 33.0 1.024 0.15 VEMDVC-073 5/5/2003 3.45 46.2 0.914 0.15 VEMDVC-072 5/5/2003 5.73 90.5 0.582 0.16 VEMDVC-071 5/5/2003 2.72 0.356 0.18



### Florida Department of Environmental Protection 56Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients

Station Sample Date DO (mg/L) DOSAT (%) Corr Chla ( μ g/L) TN (mg/L) TP (mg/L)

WPB 20010738 6/4/2003 2. 53 38.2 8.99 0.573 0.1 WPB 20010737 6/4/2003 7. 1 95.8 13.92 1.125 0.093 VEMDVC-072 8/4/2003 4.01 58.0 VEMDVC-073 8/4/2003 4.31 58.1 VEMDVC-071 8/4/2003 4. 32 61.9 2.69 0.923 0.19 VEMDVC-074 8/4/2003 4.74 63.8 WPB 20010738 8/13/2003 4. 86 66.2 1.89 1.262 0.236 WPB 20010737 8/13/2003 6. 925 99.9 24.53 1.069 0.089 WPB 20010738 8/26/2003 2. 8 38.1 11.71 1.685 0.325 WPB 20010737 8/26/2003 6. 93 103.5 7.18 0.9 0.059 WPB 20010738 9/15/2003 3. 23 43.0 1.41 1.081 0.122 WPB 20010737 9/15/2003 6. 69 96.4 19.19 0.934 0.076 WPB 20010738 10/9/2003 5.28 68.6 1 1.188 0.195 WPB 20010737 10/9/2003 6. 17 84.3 16.14 1.085 0.091 VEMDVC-074 11/3/2003 2.64 34.0 VEMDVC-073 11/3/2003 3.27 42.6 VEMDVC-072 11/3/2003 5.83 88.3 VEMDVC-071 11/3/2003 6.87 102.1 3.34 0.08 VEMDVC-074 3/1/2004 6.29 69.7 1.12 VEMDVC-073 3/1/2004 6.4 71.2 1 VEMDVC-072 3/1/2004 7.32 88.1 1.95 VEMDVC-071 3/1/2004 9.2 107.3 1.64 VEMDVC-073 6/7/2004 3.08 42.7 VEMDVC-071 6/7/2004 5.53 83.3 VEMDVC-072 6/7/2004 5.58 88.2 VEMDVC-073 10/11/2004 3.1 40.9 VEMDVC-074 10/11/2004 3.42 45.0 VEMDVC-072 10/11/2004 4.95 69.4 VEMDVC-074 12/6/2004 4.21 48.7 VEMDVC-073 12/6/2004 4.74 55.2 VEMDVC-071 12/6/2004 6.87 91.4 VEMDVC-072 12/6/2004 9.2 120.9 VEMDVC-074 2/7/2005 5.95 67.3 VEMDVC-073 2/7/2005 7.09 83.0 VEMDVC-071 2/7/2005 8. 52 107.1 2.16 0.345 0.07 VEMDVC-072 2/7/2005 8.51 115.6 CEN 27010197 2/9/2005 5.07 65.6 2. 88 0.761 0.081 CEN 27010195 2/9/2005 5.65 74.1 3.96 0.729 0.08 CEN 27010196 2/9/2005 5.73 74.5 4. 54 0.743 0.077 CEN 27010194 2/9/2005 6.05 79.5 1.43 0.648 0.07 CEN 27010193 2/9/2005 6. 15 81.2 3.18 0.646 0.0585



### Florida Department of Environmental Protection 57Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients

Station Sample Date DO (mg/L) DOSAT (%) Corr Chla ( μ g/L) TN (mg/L) TP (mg/L)

CEN 27010194 4/5/200 5 5.6 1 1.207 0.092 CEN 27010194 4/18/2005 6.38 83.6 CEN 27010196 4/18/2005 6.42 84.1 CEN 27010197 4/18/2005 6.46 84.3 CEN 27010195 4/18/2005 6.44 84.5 CEN 27010193 4/18/2005 6.5 85.4 VEMDVC-074 5/2/2005 4.25 53.2 VEMDVC-073 5/2/2005 5.16 65.9 VEMDVC-071 5/2/2005 7. 18 99.5 7.14 0.473 0.13 VEMDVC-072 5/2/2005 7.09 100.3 CEN 27010193 6/13/2005 3.68 3.475 1.381 0.315 CEN 27010194 6/13/2005 3.7 4.04 1.228 0.29 CEN 27010195 6/13/2005 3.72 3.98 1.229 0.27 CEN 27010196 6/13/2005 3.76 CEN 27010197 6/13/2005 3.7 CEN 27010197 6/29/2005 4.38 61.5 VEMDVC-072 8/8/2005 4.19 60.3 4.21 VEMDVC-073 8/8/2005 5.01 67.5 2.29 VEMDVC-074 8/8/2005 5.34 71.8 1.43 VEMDVC-071 8/8/2005 4.92 73.5 1.79 CEN 27010193 8/8/2005 4.34 2.37 1.438 0.35 CEN 27010194 8/8/2005 4.31 3.42 1.237 0.36 CEN 27010195 8/8/2005 4.21 3.42 1.236 0.31 CEN 27010196 8/8/2005 4.29 CEN 27010197 8/8/2005 4.18 VEMDVC-074 11/7/2005 6.42 78.8 VEMDVC-073 11/7/2005 6.43 80.7 VEMDVC-072 11/7/2005 7.13 97.6 VEMDVC-071 11/7/2005 7.4 100.8 3.87 0.09 CEN 27010193 12/12/2005 6.05 69.1 2.55 0.13 CEN 27010196 12/12/2005 6.17 69.2 CEN 27010194 12/12/2005 6.04 69.3 2.71 0.14 CEN 27010195 12/12/2005 6.42 72.8 2.63 0.1 CEN 27010197 12/12/2005 6.54 72.8 VEMDVC-073 1/9/2006 5.34 56.7 2.45 VEMDVC-072 1/9/2006 7.52 90.2 1.58 VEMDVC-071 1/9/2006 8.72 102.1 1.04 0.223 0 VEMDVC-073 4/3/2006 5.97 77.8 VEMDVC-071 4/3/2006 6. 48 85.9 1.03 0.27 0.22 VEMDVC-071 7/10/2006 2.07 VEMDVC-072 7/10/2006 5.29



### Florida Department of Environmental Protection 58Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients

Station Sample Date DO (mg/L) DOSAT (%) Corr Chla ( μ g/L) TN (mg/L) TP (mg/L)

VEMDVC-073 7/10/20 06 17.88 0.03 VEMDVC-073 10/3/2006 2.79 36 13.29 0.21 VEMDVC-073 10/3/2006 2.79 39.5 13.29 VEMDVC-072 10/3/2006 5.99 88.5 6.72 0.12 VEMDVC-072 10/3/2006 5.99 96.8 6.72 VEMDVC-071 10/3/2006 6.35 97.3 7.01 0.09



### Florida Department of Environmental Protection 59Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



## Appendix C: Kruskal–Wallis Analysis of DO, DOSAT, Corrected Chla, TN, and TP Observations versus Season in Spruce Creek

Kruskal-Wallis One-Way Analysis of Variance for 492 cases Dependent variable is DO Grouping variable is SEASON$ Group Count Rank Sum

FALL 133 33366.000 SPRING 122 28163.500 SUMMER 113 18079.000 WINTER 124 41669.500

Kruskal-Wallis Test Statistic = 92.632 Probability is 0.000 assuming Chi-square distribution with 3 df

Kruskal-Wallis One-Way Analysis of Variance for 481 cases Dependent variable is DOSAT Grouping variable is SEASON$ Group Count Rank Sum

FALL 133 32272.500 SPRING 116 28035.500 SUMMER 108 20317.500 WINTER 124 35295.500

Kruskal-Wallis Test Statistic = 27.874 Probability is 0.000 assuming Chi-square distribution with 3 df

Kruskal-Wallis One-Way Analysis of Variance for 459 cases Dependent variable is CHLAC Grouping variable is SEASON$ Group Count Rank Sum

FALL 110 21742.500 SPRING 107 31267.500 SUMMER 125 34480.000 WINTER 117 18080.000

Kruskal-Wallis Test Statistic = 83.378 Probability is 0.000 assuming Chi-square distribution with 3 df



### Florida Department of Environmental Protection 60Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



### Kruskal-Wallis One-Way Analysis of Variance for 435 cases Dependent variable is TN Grouping variable is SEASON$ Group Count Rank Sum

FALL 97 23811.000 SPRING 111 18692.500 SUMMER 112 29324.000 WINTER 115 23002.500

Kruskal-Wallis Test Statistic = 37.870 Probability is 0.000 assuming Chi-square distribution with 3 df

Kruskal-Wallis One-Way Analysis of Variance for 459 cases Dependent variable is TP Grouping variable is SEASON$ Group Count Rank Sum

FALL 111 24608.500 SPRING 118 29985.500 SUMMER 113 33349.000 WINTER 117 17627.000

Kruskal-Wallis Test Statistic = 73.545 Probability is 0.000 assuming Chi-square distribution with 3 df



### Florida Department of Environmental Protection 61Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



## Appendix D: Kruskal–Wallis Analysis of DO, DOSAT, Corrected Chla, TN, and TP Observations versus Month in Spruce Creek

Kruskal-Wallis One-Way Analysis of Variance for 492 cases Dependent variable is DO Grouping variable is MONTH Group Count Rank Sum

1 39 12790.500 2 49 16398.500 3 36 12480.500 4 43 12387.000 5 33 7512.500 6 46 8264.000 7 37 5457.000 8 42 7277.500 9 34 5344.500 10 44 9041.000 11 44 11385.000 12 45 12940.000

Kruskal-Wallis Test Statistic = 114.195 Probability is 0.000 assuming Chi-square distribution with 11 df

Kruskal-Wallis One-Way Analysis of Variance for 481 cases Dependent variable is DOSAT Grouping variable is MONTH Group Count Rank Sum

1 39 10571.500 2 49 13963.500 3 36 10760.500 4 42 11531.000 5 33 7864.500 6 41 8640.000 7 37 6333.500 8 37 7832.000 9 34 6152.000 10 44 9542.000 11 44 11036.500 12 45 11694.000

Kruskal-Wallis Test Statistic = 37.086 Probability is 0.000 assuming Chi-square distribution with 11 df



### Florida Department of Environmental Protection 62Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



### Kruskal-Wallis One-Way Analysis of Variance for 459 cases Dependent variable is CHLAC Grouping variable is MONTH Group Count Rank Sum

1 35 5485.500 2 42 6308.500 3 40 6286.000 4 34 7477.000 5 34 10673.500 6 39 13117.000 7 40 12218.500 8 47 13079.500 9 38 9182.000 10 37 8333.000 11 38 6000.000 12 35 7409.500

Kruskal-Wallis Test Statistic = 108.868 Probability is 0.000 assuming Chi-square distribution with 11 df

Kruskal-Wallis One-Way Analysis of Variance for 435 cases Dependent variable is TN Grouping variable is MONTH Group Count Rank Sum

1 37 6797.000 2 45 8781.000 3 33 7424.500 4 35 6221.500 5 39 5920.500 6 37 6550.500 7 33 8281.500 8 41 11510.500 9 38 9532.000 10 31 9297.500 11 35 9272.000 12 31 5241.500

Kruskal-Wallis Test Statistic = 60.474 Probability is 0.000 assuming Chi-square distribution with 11 df



### Florida Department of Environmental Protection 63Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



### Kruskal-Wallis One-Way Analysis of Variance for 459 cases Dependent variable is TP Grouping variable is MONTH Group Count Rank Sum

1 37 5820.500 2 46 5747.500 3 34 6059.000 4 38 8386.000 5 42 10459.000 6 38 11140.500 7 34 10831.000 8 41 13389.000 9 38 9129.000 10 38 11002.500 11 38 8048.500 12 35 5557.500

Kruskal-Wallis Test Statistic = 110.555 Probability is 0.000 assuming Chi-square distribution with 11 df



### Florida Department of Environmental Protection 64Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



## Appendix E: Chart of DO, DOSA T, Corrected Chla, TN, and TP Observations by Season, Station, and Year in Spruce Creek

C

E N

2 7 0 1 0 1 9 3

C

E N

2 7 0 1 0 1 9 4

C

E N

2 7 0 1 0 1 9 5

C

E N

2 7 0 1 0 1 9 6

C

E N

2 7 0 1 0 1 9 7

S J W

M

S P R C

R

S J W

M

U

E C 0 1 4

V

E M

D S C

0 1
V

E M

D S C 0 2

V

E M

D S C

0 4

V

E M

D S C 0 5

V

E M

D V C

- 0 7 1

V

E M

D V C

- 0 7 2

V

E M

D V C

- 0 7 3

V

E M

D V C

- 0 7 4

W

P B

2 0 0 1 0 7 3 7 WP

B

2 0 0 1 0 7 3 8



## STATION 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 10.5 11.0 11.5 12.0

D I S S O L V E D O X Y G E N ( M G / L )



## WINTER SUMMER SPRING FALL SEASON

C

E N

2 7 0 1 0 1 9 3

C

E N

2 7 0 1 0 1 9 4

C

E N

2 7 0 1 0 1 9 5

C

E N

2 7 0 1 0 1 9 6

C

E N

2 7 0 1 0 1 9 7

S J W

M

S P R C

R

S J W

M

U

E C 0 1 4

V

E M

D S C 0 1
V

E M

D S C

0 2

V

E M

D S C

0 4

V

E M

D S C

0 5

V

E M

D V C

- 0 7 1

V

E M

D V C

- 0 7 2

V

E M

D V C

- 0 7 3

V

E M

D V C

- 0 7 4

W

P B

2 0 0 1 0 7 3 7

W

P B

2 0 0 1 0 7 3 8



## STATION 0 7 14 21 28 35 42 49 56 63 70 77 84 91 98 105 112 119 126 133 140

D O S A T ( % )



## WINTER SUMMER SPRING FALL SEASON

Florida Department of Environmental Protection 65Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients

C

E N

2 7 0 1 0 1 9 3

C

E N

2 7 0 1 0 1 9 4

C

E N

2 7 0 1 0 1 9 5

C

E N

2 7 0 1 0 1 9 6

C

E N

2 7 0 1 0 1 9 7

S J W

M

S P R C

R

S J W

M

U E C 0 1 4

V

E M

D S C 0 1
V

E M

D S C

0 2

V

E M

D S C 0 4

V

E M

D S C

0 5

V

E M

D V C

- 0 7 1

V

E M

D V C

- 0 7 2

V

E M

D V C

- 0 7 3

V

E M

D V C

- 0 7 4

W

P B

2 0 0 1 0 7 3 7

W

P B

2 0 0 1 0 7 3 8



## STATION 0.0 4.5 9.0 13.5 18.0 22.5 27.0 31.5 36.0 40.5 45.0 49.5 54.0 58.5 63.0 67.5 72.0 76.5 81.0 85.5 90.0

C O R R C H L A ( U G / L )



## WINTER SUMMER SPRING FALL SEASON

C

E N

2 7 0 1 0 1 9 3

C

E N

2 7 0 1 0 1 9 4

C

E N

2 7 0 1 0 1 9 5

C

E N

2 7 0 1 0 1 9 6

C

E N

2 7 0 1 0 1 9 7

S J W

M

S P R C

R

S J W

M

U E C 0 1 4

V

E M

D S C 0 1
V

E M

D S C

0 2

V

E M

D S C

0 4

V

E M

D S C

0 5

V

E M

D V C

- 0 7 1

V

E M

D V C

- 0 7 2

V

E M

D V C

- 0 7 3

V

E M

D V C

- 0 7 4

W

P B

2 0 0 1 0 7 3 7

W

P B

2 0 0 1 0 7 3 8



## STATION 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0

T O T A L N I T R O G E N ( M G / L )



## WINTER SUMMER SPRING FALL SEASON

Florida Department of Environmental Protection 66Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients

C

E N

2 7 0 1 0 1 9 3

C

E N

2 7 0 1 0 1 9 4

C

E N

2 7 0 1 0 1 9 5

C

E N

2 7 0 1 0 1 9 6

C

E N

2 7 0 1 0 1 9 7

S J W

M

S P R C

R

S J W

M

U

E C

0 1 4

V

E M

D S C 0 1
V

E M

D S C 0 2

V

E M

D S C 0 4

V

E M

D S C

0 5

V

E M

D V C

- 0 7 1

V

E M

D V C

- 0 7 2

V

E M

D V C

- 0 7 3

V

E M

D V C

- 0 7 4

W

P B

2 0 0 1 0 7 3 7

W

P B

2 0 0 1 0 7 3 8



## STATION 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00

T O T A L P H O S P H O R U S ( M G / L )



## WINTER SUMMER SPRING FALL SEASON

1 9 9 0 1 9 9

1 1

9 9 2 1 9 9 3 1 9 9 4 1 9 9 5 1 9 9 6 1 9 9 7 1 9 9 8 1 9 9 9

2 0 0 0

2 0 0

1 2

0 0 2

2 0 0 3

2 0 0 4

2 0 0 5

2 0 0 6

2 0 0 7 

# YEAR 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 10.5 11.0 11.5 12.0

D I S S O L V E D O X Y G E N ( M G / L )



### Florida Department of Environmental Protection 67Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients

1 9 9 0 1 9 9

1 1

9 9 2 1 9 9 3

1 9 9 4 1 9 9 5

1 9 9 6

1 9 9 7

1 9 9 8

1 9 9 9

2 0 0 0

2 0 0

1 2

0 0 2

2 0 0 3

2 0 0 4

2 0 0 5

2 0 0 6

2 0 0 7 

# YEAR 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130

D O S A T ( % )

1 9 9 0 1 9 9

1 1

9 9 2 1 9 9 3 1 9 9 4 1 9 9 5 1 9 9 6 1 9 9 7 1 9 9 8 1 9 9 9

2 0 0 0

2 0 0

1 2

0 0 2

2 0 0 3

2 0 0 4

2 0 0 5

2 0 0 6

2 0 0 7 

# YEAR 0 3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60 63 66 69 72 75 78 81 84 87 90

C O R R C H L A ( U G / L )



### Florida Department of Environmental Protection 68Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients

1 9 9 0

1 9 9

1 1

9 9 2

1 9 9 3

1 9 9 4

1 9 9 5

1 9 9 6

1 9 9 7

1 9 9 8

1 9 9 9

2 0 0 0

2 0 0

1 2

0 0 2

2 0 0 3

2 0 0 4

2 0 0 5

2 0 0 6

2 0 0 7 

# YEAR 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0

T O T A L N I T R O G E N ( M G / L )

1 9 9 0

1 9 9

1 1

9 9 2

1 9 9 3

1 9 9 4

1 9 9 5

1 9 9 6

1 9 9 7

1 9 9 8

1 9 9 9

2 0 0 0

2 0 0

1 2

0 0 2

2 0 0 3

2 0 0 4

2 0 0 5

2 0 0 6

2 0 0 7 

# YEAR 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00

T O T A L P H O S P H O R U S ( M G / L )



### Florida Department of Environmental Protection 69Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients

0
.

0 0
. 4 0
. 8 1 . 2 1 . 6 2
. 0 2
. 4 2
. 8 3
. 2 3
. 6 4
. 0 4
. 4 4
. 8 5
. 2 5
. 6 6
. 0 6
. 4 6
. 8 7
. 2 7
. 6 8
. 0 8
. 4 8
. 8 9
. 2 9
. 6 1 0
.

0 

# DISSOLVED OXYGEN (MG/L) 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00

F R A C T I O N O F D A T A

0 5 1 0 1 5 2 0 2 5 3 0 3 5 4 0 4 5 5 0 5 5 6 0 6 5 7 0 7 5 8 0 8 5 9 0 9 5

1 0 0

1 0 5

1 1 0

1 1 5

1 2 0

1 2 5

1 3 0 

# DOSAT (%) 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00

F R A C T I O N O F D A T A



### Florida Department of Environmental Protection 70Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients

0 3 6 9 1 2 1

5 1

8 2

1 2

4 2

7 3

0 3

3 3

6 3

9 4

2 4

5 4

8 5

1 5

4 5

7 6

0 6

3 6

6 6

9 7

2 7

5 7

8 8

1 8

4 8

7 9

0 

# CORR CHLA (UG/L) 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00

F R A C T I O N O F D A T A

0
. 0 0
. 2 0
. 4 0
. 6 0
. 8 1 . 0 1 . 2 1 . 4 1 . 6 1 . 8 2
. 0 2
. 2 2
. 4 2
. 6 2
. 8 3
. 0 3
. 2 3
. 4 3
. 6 3
. 8 4
. 0 

# TOTAL NITROGEN (MG/L) 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00

F R A C T I O N O F D A T A



### Florida Department of Environmental Protection 71Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients

0
.

0 0 0
.

0 4 0
.

0 8 0
.

1 2 0
.

1 6 0
.

2 0 0
.

2 4 0
.

2 8 0
.

3 2 0
.

3 6 0
.

4 0 0
.

4 4 0
.

4 8 0
.

5 2 0
.

5 6 0
.

6 0 0
.

6 4 0
.

6 8 0
.

7 2 0
.

7 6 0
.

8 0 0
.

8 4 0
.

8 8 0
.

9 2 0
.

9 6 1 .

0 0 

# TOTAL PHOSPHORUS (MG/L) 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00

F R A C T I O N O F D A T A



## DO VERSUS SAMPLING DATE

y = 0.0002x - 0.818 R 2

= 0.0141



## 0 2 4 6 8 10 12

9/19/19 9

1 1/31/ 199 3 6/15/ 199 4 10/ 28/199 5 3/11/1997 7/24/19 9

8 12/ 6/199 9 4/

19/200 1

9

/ 1/2002 1/14/200 4 5/28/2005 10

/ 10

/ 2006 2/22/ 2008



## SAMPLE DATEDISSOLVED OXYGEN(MG/L)



### Florida Department of Environmental Protection 72Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



## CORR CHLA VERSUS SAMPLING DATE

y = -0.0003x + 18.666 R 2

= 0.0006



## 0 10 20 30 40 50 60 70 80 90 100

9/19/19 9

1 1/31/1993

6

/15/199 4 10/28/ 199 5 3/11/ 199 7 7/

24/199 8 12/6/1999 4/19/2 00

1

9

/1

/ 2002 1/14/2004 5/

2

8/200 5 10/10/2006 2/22/200 8



## SAMPLE DATECORR CHLA (UG/L)



## TN VERSUS SAMPLING DATE

y = -0.0002x + 6.361 R 2

= 0.1233



## 0 0.5 1 1.5

2 2.5 3 3.5

4

9/19/19 9

1 1/31/1993

6

/15/199 4 10/28/ 199 5 3/11/ 199 7 7/

24/199 8 12/6/1999 4/19/2 00

1

9

/1

/ 2002 1/14/2004 5/

2

8/200 5 10/10/2006 2/22/200 8



## SAMPLE DATETOTAL NITROGEN (MG/L)



### Florida Department of Environmental Protection 73Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



## TP VERSUS SAMPLING DATE

y = -6E-06x + 0.3858 R 2 = 0.006



## 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8

9/19/ 199 1 1/31/ 1

9

93 6/

1 5/1 9

94 10/28/ 1

995

3/11/1997 7/24/ 1

998

12/6/1999

4

/ 19

/ 200 1

9

/ 1/2002 1/14/2004 5/28/2005 10

/ 10

/ 2006 2/22/200 8



## SAMPLE DATETOTAL PHOSPHORUS(MG/L)

STORET ID Station 

### 21FLVEMDSC01 Spruce Creek Center Bridge on U.S. Hwy 1 21FLVEMDSC02 Spruce Creek West of SSC Railroad 21FLVEMDSC04 Spruce Creek West of Airport Rd 21FLVEMDSC05 Spruce Creek at Dock at Gamble Place 21FLSJWMSPRCR Spruce Creek 100 M Upstream from ICWW 21FLSJWMUEC014 Spruce Creek at Airport Rd 21FLVEMDVC-071 Spruce Creek, from W Side of Center Bridge on U.S. 1 21FLVEMDVC-072 Spruce Creek, from Dock at Riverwood, W. of SCL Railroad 21FLVEMDVC-073 Spruce Creek, from W. Side of Moody Bridge on Airport Rd 21FLVEMDVC-074 Spruce Creek, from Dock at Gamble Place 21FLWPB 20010737 Spruce Creek @ Cypress Head Development 21FLWPB 20010738 Spruce Creek @ Airport Rd 21FLCEN 27010193 Spruce Creek @ 675M Upstream of RR Bridge 21FLCEN 27010194 Spruce Creek @ 0.68 Miles Upstream of RR Bridge 21FLCEN 27010195 Spruce Creek @ 0.87 Miles Upstream of RR Bridge 21FLCEN 27010196 Spruce Creek @ 1.07 Miles Upstream of RR Bridge 21FLCEN 27010197 Spruce Creek @ 1.3 Miles Upstream of RR Bridge



### Florida Department of Environmental Protection 74Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



## Appendix F: Chart of Rainfall for Daytona International Airport, 1948– 2006



# DAYTONA BEACH INTERNATIONAL AIRPORT RAINFALL 1948 - 2006

0.00 2.00 4.00 6.00 8.00 10.001/1/19481/1/19521/1/19561/1/19601/1/19641/1/19681/1/19721/1/19761/1/19801/1/19841/1/19881/1/19921/1/19961/1/20001/1/2004



## DATERAINFALL (INCHES)



### Florida Department of Environmental Protection 75Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



## Appendix G: Spearman Correlation Ma trix Analysis for Water Quality Parameters in Spruce Creek

Spearman correlation matrix

DATE2 TIME DEPTH DO DOSAT DATE2 1.000

TIME 0.284 1.000 DEPTH -0.036 -0.049 1.000 DO 0.087 0.419 -0.157 1.000 DOSAT 0.257 0.501 -0.257 0.918 1.000

CHLA 0.066 0.186 -0.074 -0.097 0.076 CHLAC -0.044 0.099 -0.076 -0.152 0.001 TN -0.401 -0.266 -0.060 -0.184 -0.253 TP -0.065 -0.280 0.061 -0.478 -0.440 COLOR -0.016 -0.272 0.119 -0.244 -0.373

TEMP 0.053 -0.015 -0 .016 -0.412 -0.145

NH4 -0.366 -0.361 0.239 -0.422 -0.538 NO3O2 -0.087 -0.128 0.114 -0.142 -0.276 SECCHI -0.025 0. 160 0.149 0.094 0.114 TKN -0.430 -0.274 -0.059 -0.188 -0.251 BOD -0.175 -0.113 -0.242 -0.847 0.200 TSS -0.050 0.358 -0.116 0.321 0.476 ORTHOP -0.135 -0.404 -0.005 -0.523 -0.547 TURBIDITY 0.128 0. 076 -0.071 0.069 0.163

SALINITY 0.019 0.384 -0.143 0.368 0.528 FLOWCFS 0.020 -0.012 -0.029 0.131 0.037 FLOW3DAYAVE 0.045 -0. 017 -0.012 0.125 0.038 PRECIP -0.030 -0.046 0.086 -0.089 -0.069 RAINDAY3 0.065 -0.057 -0.003 -0.089 -0.080 CHLA CHLAC TN TP COLOR CHLA 1.000 CHLAC 0.950 1.000 TN -0.272 -0.170 1.000 TP 0.073 0.176 0.263 1.000 COLOR -0.437 -0. 391 0.594 0.194 1.000

TEMP 0.564 0.532 0.048 0.401 -0.138

NH4 0.471 0.006 0.322 0.219 0.001 NO3O2 -0.285 -0. 266 0.326 0.063 0.517 SECCHI 0.268 0.239 -0 .539 -0.112 -0.670 TKN -0.241 -0.124 0.992 0.263 0.524 BOD

. 0.300 0.644 0.483

. TSS 0.475 0.390 -0.278 -0.053 -0.610 ORTHOP -0.083 -0 .003 0.456 0.675 0.534 TURBIDITY 0.137 0. 086 0.085 0.222 -0.040

SALINITY 0.439 0.360 -0.557 -0.225 -0.844 FLOWCFS -0.431 -0.395 0.447 0.088 0.644 FLOW3DAYAVE -0.431 -0 .385 0.442 0.092 0.642 PRECIP 0.103 0.053 -0.008 0.162 0.045 RAINDAY3 -0.073 -0 .099 0.082 0.266 0.194



### Florida Department of Environmental Protection 76Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



## Spearman correlation matrix (continued)

TEMP NH4 NO3O2 SECCHI TKN TEMP 1.000

NH4 -0.033 1.000 NO3O2 -0.287 0.528 1.000 SECCHI 0.021 -0. 245 -0.267 1.000 TKN 0.080 0.258 0. 232 -0.514 1.000 BOD 0.671 -0.004 -0 .088 -0.574 0.869 TSS 0.328 -0.160 -0.371 0.258 -0.206 ORTHOP 0.309 0.179 0.307 -0.346 0.405 TURBIDITY 0.198 0. 047 0.019 -0.222 0.108

SALINITY 0.199 -0.438 -0.493 0.536 -0.482 FLOWCFS -0.118 -0.062 0.349 -0.559 0.379 FLOW3DAYAVE -0.097 -0. 058 0.330 -0.534 0.378 PRECIP 0.150 0.054 -0 .009 -0.059 -0.010 RAINDAY3 0.104 -0. 153 0.068 -0.256 0.069 BOD TSS ORTHOP TURBIDITY SALINITY BOD 1.000 TSS

. 1.000 ORTHOP

. -0.340 1.000 TURBIDITY

. 0.492 0.097 1.000

SALINITY 0.763 0.726 -0.523 0.129 1.000 FLOWCFS 0.541 -0.215 0.325 0.105 -0.441 FLOW3DAYAVE 0.483 -0. 232 0.314 0.072 -0.451 PRECIP -0.242 0.123 0.134 0.073 -0.025 RAINDAY3 0.582 0. 019 0.349 0.166 -0.143 FLOWCFS FLOW3DAYAVE PRECIP RAINDAY3 FLOWCFS 1.000 FLOW3DAYAVE 0.969 1.000 PRECIP 0.079 0.017 1.000 RAINDAY3 0.408 0.342 0.507 1.000



### Florida Department of Environmental Protection 77Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



## Pair-wise frequency table

DATE2 TIME DEPTH DO DOSAT DATE2 538

TIME 534 534 DEPTH 528 528 528 DO 492 492 486 492 DOSAT 481 481 475 481 481

CHLA 300 300 296 264 264 CHLAC 459 459 455 421 414 TN 435 435 431 401 394 TP 459 455 454 419 412 COLOR 490 490 484 449 449

TEMP 498 498 492 492 481

NH4 68 68 66 68 61 NO3O2 481 481 477 442 435 SECCHI 463 463 458 423 412 TKN 464 460 455 425 418 BOD 27 27 27 27 16 TSS 439 435 430 399 399 ORTHOP 399 399 399 362 362 TURBIDITY 453 449 443 413 413

SALINITY 449 449 449 444 444 FLOWCFS 538 534 528 492 481 FLOW3DAYAVE 538 534 528 492 481 PRECIP 538 534 528 492 481 RAINDAY3 538 534 528 492 481 CHLA CHLAC TN TP COLOR CHLA 300 CHLAC 299 459 TN 265 410 435 TP 273 428 430 459 COLOR 294 437 421 436 490

TEMP 267 424 401 420 454

NH4 13 55 56 60 51 NO3O2 289 435 435 434 459 SECCHI 287 401 381 391 426 TKN 274 432 435 457 442 BOD 0 15 12 15 0 TSS 264 407 410 429 432 ORTHOP 266 356 348 360 393 TURBIDITY 277 421 423 442 446

SALINITY 244 388 360 382 417 FLOWCFS 300 459 435 459 490 FLOW3DAYAVE 300 459 435 459 490 PRECIP 300 459 435 459 490 RAINDAY3 300 459 435 459 490



### Florida Department of Environmental Protection 78Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



## Pair-wise frequency table (continued)

TEMP NH4 NO3O2 SECCHI TKN TEMP 498

NH4 68 68 NO3O2 445 61 481 SECCHI 429 25 426 463 TKN 425 63 438 394 464 BOD 27 15 12 25 15 TSS 399 36 416 383 436 ORTHOP 365 36 386 351 362 TURBIDITY 413 48 429 384 449

SALINITY 449 41 404 399 382 FLOWCFS 498 68 481 463 464 FLOW3DAYAVE 498 68 481 463 464 PRECIP 498 68 481 463 464 RAINDAY3 498 68 481 463 464 BOD TSS ORTHOP TURBIDITY SALINITY BOD 27 TSS 0 439 ORTHOP 0 363 399 TURBIDITY 0 439 364 453

SALINITY 16 375 346 376 449 FLOWCFS 27 439 399 453 449 FLOW3DAYAVE 27 439 399 453 449 PRECIP 27 439 399 453 449 RAINDAY3 27 439 399 453 449 FLOWCFS FLOW3DAYAVE PRECIP RAINDAY3 FLOWCFS 538 FLOW3DAYAVE 538 538 PRECIP 538 538 538 RAINDAY3 538 538 538 538



### Florida Department of Environmental Protection 79Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



## Appendix H: Linear Re gression Analysis of DO and Corrected Chla Observations versus Nutrients and BOD in Spruce Creek

Dep Var: DO N: 419 Multiple R: 0.422 Squared multiple R: 0.178 Adjusted squared multiple R: 0.177 Standard error of estimate: 1.909

Effect Coefficient Std Error St d Coef Tolerance t P(2 Tail) CONSTANT 6.389 0.188 0.000

. 34.027 0.000 TP -8.941 0.939 -0. 422 1.000 -9.518 0.000 Analysis of Variance

Source Sum-of-Squares df Mean-Square F-ratio P Regression 330.273 1 330.273 90.600 0.000 Residual 1520.124 417 3.645 *** WARNING *** Case 75 has large leverage (Leverage = 0.067) Case 95 has large leverage (Leverage = 0.060) Case 141 has large leverage (Leverage = 0.049) Case 151 has large leverage (Leverage = 0.052) Case 326 has large leverage (Leverage = 0.055)

Durbin-Watson D Statistic 1.581 First Order Autocorrelation 0.204

Dep Var: DO N: 401 Multiple R: 0.109 Squared multiple R: 0.012 Adjusted squared multiple R: 0.009 Standard error of estimate: 2.090

Effect Coefficient Std Error St d Coef Tolerance t P(2 Tail) CONSTANT 5.220 0.230 0.000

. 22.674 0.000 TN -0.438 0.201 -0. 109 1.000 -2.180 0.030 Analysis of Variance

Source Sum-of-Squares df Mean-Square F-ratio P Regression 20.764 1 20.764 4.754 0.030 Residual 1742.565 399 4.367 *** WARNING *** Case 45 has large leverage (Leverage = 0.046) Case 46 has large leverage (Leverage = 0.046) Case 153 has large leverage (Leverage = 0.066)

Durbin-Watson D Statistic 1.465 First Order Autocorrelation 0.263



### Florida Department of Environmental Protection 80Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients

Dep Var: DO N: 421 Multiple R: 0.145 Squared multiple R: 0.021 Adjusted squared multiple R: 0.019 Standard error of estimate: 2.089

Effect Coefficient Std Error St d Coef Tolerance t P(2 Tail) CONSTANT 4.917 0.108 0.000

. 45.608 0.000 CHLAC -0.016 0.005 -0 .145 1.000 -3.001 0.003 Analysis of Variance

Source Sum-of-Squares df Mean-Square F-ratio P Regression 39.303 1 39.303 9.006 0.003 Residual 1828.584 419 4.364 *** WARNING *** Case 226 has large leverage (Leverage = 0.348) Case 351 has large leverage (Leverage = 0.446)

Durbin-Watson D Statistic 1.452 First Order Autocorrelation 0.270

Dep Var: DO N: 68 Multiple R: 0.547 Squared multiple R: 0.299 Adjusted squared multiple R: 0.289 Standard error of estimate: 1.509

Effect Coefficient Std Error Std Coef Toleranc e t P(2 Tail) CONSTANT 5.658 0.284 0.000

. 19.898 0.000 NH4 -18.990 3.578 -0 .547 1.000 -5.307 0.000 Analysis of Variance

Source Sum-of-Squares df Mean-Square F-ratio P Regression 64.109 1 64.109 28.168 0.000 Residual 150.211 66 2.276 *** WARNING *** Case 17 has large leverage (Leverage = 0.176) Case 456 has large leverage (Leverage = 0.177)

Durbin-Watson D Statistic 1.560 First Order Autocorrelation 0.146



### Florida Department of Environmental Protection 81Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients

Dep Var: DO1 N: 27 Multiple R: 0.828 Squared multiple R: 0.685 Adjusted squared multiple R: 0.672 Standard error of estimate: 0.632

Effect Coefficient Std Error St d Coef Tolerance t P(2 Tail) CONSTANT 6.938 0.258 0.000

. 26.842 0.000 BOD -0.892 0.121 -0. 828 1.000 -7.371 0.000 Analysis of Variance

Source Sum-of-Squares df Mean-Square F-ratio P Regression 21.692 1 21.692 54.327 0.000 Residual 9.982 25 0.399 *** WARNING *** Case 466 is an outlier (Studentized Residual = -4.093)

Durbin-Watson D Statistic 1.624 First Order Autocorrelation 0.165

Dep Var: DO N: 442 Multiple R: 0.086 Squared multiple R: 0.007 Adjusted squared multiple R: 0.005 Standard error of estimate: 2.086

Effect Coefficient Std Error St d Coef Tolerance t P(2 Tail) CONSTANT 5.014 0.150 0.000

. 33.524 0.000 NO3O2 -2.801 1.555 -0 .086 1.000 -1.801 0.072 Analysis of Variance

Source Sum-of-Squares df Mean-Square F-ratio P Regression 14.112 1 14.112 3.244 0.072 Residual 1913.820 440 4.350 *** WARNING *** Case 215 has large leverage (Leverage = 0.129) Case 279 has large leverage (Leverage = 0.084)

Durbin-Watson D Statistic 1.368 First Order Autocorrelation 0.313



### Florida Department of Environmental Protection 82Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients

Dep Var: CHLAC N: 428 Multiple R: 0.036 Squared multiple R: 0.001 Adjusted squared multiple R: 0.000 Standard error of estimate: 18.871

Effect Coefficient Std Error St d Coef Tolerance t P(2 Tail) CONSTANT 5.560 1. 808 0.000

. 3.076 0.002 TP 6.556 8.877 0. 036 1.000 0.738 0.461 Analysis of Variance

Source Sum-of-Squares df Mean-Square F-ratio P Regression 194.209 1 194.209 0.545 0.461 Residual 151699.350 426 356.102 *** WARNING *** Case 75 has large leverage (Leverage = 0.061) Case 90 is an outlier (Studentized Residual = 3.985) Case 95 has large leverage (Leverage = 0.054) Case 141 has large leverage (Leverage = 0.044) Case 151 has large leverage (Leverage = 0.047) Case 226 is an outlier (Studentized Residual = 14.825) Case 326 has large leverage (Leverage = 0.050) Case 351 is an outlier (Studentized Residual = 18.093)

Durbin-Watson D Statistic 1.975 First Order Autocorrelation 0.011

Dep Var: CHLAC N: 435 Multiple R: 0.052 Squared multiple R: 0.003 Adjusted squared multiple R: 0.000 Standard error of estimate: 18.724

Effect Coefficient Std Error St d Coef Tolerance t P(2 Tail) CONSTANT 7.624 1. 336 0.000

. 5.705 0.000 NO3O2 -15.558 14.431

- 0.052 1.000 -1.078 0.282 Analysis of Variance

Source Sum-of-Squares df Mean-Square F-ratio P Regression 407.482 1 407.482 1.162 0.282 Residual 151797.347 433 350.571 *** WARNING *** Case 90 is an outlier (Studentized Residual = 4.032) Case 215 has large leverage (Leverage = 0.140) Case 226 is an outlier (Studentized Residual = 14.834) Case 279 has large leverage (Leverage = 0.091) Case 351 is an outlier (Studentized Residual = 18.322)

Durbin-Watson D Statistic 1.967 First Order Autocorrelation 0.015



### Florida Department of Environmental Protection 83Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients

Dep Var: CHLAC N: 55 Multiple R: 0.014 Squared multiple R: 0.000 Adjusted squared multiple R: 0.000 Standard error of estimate: 7.675

Effect Coefficient Std Error St d Coef Tolerance t P(2 Tail) CONSTANT 6.460 1. 527 0.000

. 4.231 0.000 NH4 1.925 19.297 0. 014 1.000 0.100 0.921 Analysis of Variance

Source Sum-of-Squares df Mean-Square F-ratio P Regression 0.586 1 0.586 0.010 0.921 Residual 3122.352 53 58.912 *** WARNING *** Case 17 has large leverage (Leverage = 0.205) Case 443 is an outlier (Studentized Residual = 4.014) Case 456 has large leverage (Leverage = 0.206)

Durbin-Watson D Statistic 2.040 First Order Autocorrelation -0.083

Dep Var: CHLAC N: 428 Multiple R: 0.036 Squared multiple R: 0.001 Adjusted squared multiple R: 0.000 Standard error of estimate: 18.871

Effect Coefficient Std Error St d Coef Tolerance t P(2 Tail) CONSTANT 5.560 1. 808 0.000

. 3.076 0.002 TP 6.556 8.877 0. 036 1.000 0.738 0.461 Analysis of Variance

Source Sum-of-Squares df Mean-Square F-ratio P Regression 194.209 1 194.209 0.545 0.461 Residual 151699.350 426 356.102 *** WARNING *** Case 75 has large leverage (Leverage = 0.061) Case 90 is an outlier (Studentized Residual = 3.985) Case 95 has large leverage (Leverage = 0.054) Case 141 has large leverage (Leverage = 0.044) Case 151 has large leverage (Leverage = 0.047) Case 226 is an outlier (Studentized Residual = 14.825) Case 326 has large leverage (Leverage = 0.050) Case 351 is an outlier (Studentized Residual = 18.093)

Durbin-Watson D Statistic 1.975 First Order Autocorrelation 0.011



### Florida Department of Environmental Protection 84Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



## Appendix I: Monthly a nd Annual Precipitation at Daytona International Airport, 1948–2006

Year(s) Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual Totals 1948 4.52 1.22 5.13 2. 37 0.49 2.4 10.43 7.33 9.82 8.29 1.07 1.93 55 1949 0.37 1.95 2.01 7.12 1.4 4.24 5.97 11.5 6. 26 3.65 1.86 3.93 50.22 1950 0.15 0.59 3.53 2. 79 2.13 6.45 5.56 3.88 5.86 13 0.74 2.54 47.22 1951 0.77 2.46 1.18 3. 28 2.53 2.66 3.8 4.19 14 8.54 3.15 2.88 49.46 1952 0.66 6.76 3.01 1.66 4.39 1.35 1.25 9.02 11. 9 5.41 1.96 0.71 48.1 1953 1.75 3.35 7.75 4. 97 1.46 1.37 8.67 19.9 10 12.9 2.3 4.85 79.29 1954 0.37 0.86 2.33 6.29 3.21 2.35 3.5 3.04 1. 88 4.91 3.98 1.24 33.96 1955 2.47 1.43 1.84 1.78 1.55 7.76 5.67 2.64 6. 66 3.17 2.61 1.22 38.8 1956 2.55 0.9 0.25 2.42 2.48a 7.41 3.01 4.06 1. 94 5.82 0.46 0.06 31.36 1957 0.97 1.62 3.13 1.73 5.65 4.23 10.53 4.01 10. 7 1.8 0.82 1.34 46.48 1958 3.94 4.73 5.52 2. 24 2.27 6.06 1.96 4 2. 19 8.52 1.77 1.95 45.15 1959 4.53 2.13 7.7 3.17 2.4 8.13 5.68 3.6 5. 26 7.12 4.26 2.26 56.24 1960 1.16 9.13 7.52 0. 76 0.62 10.8 8.7 6.84 11 0.97 0.53 1.24 59.18 1961 1.96 3.7 1.17 2.16 2.39 6.81 5.16 7.68 3. 2 2.25 2.85 0.73 40.06 1962 0.9 0.82 1.82 0.78 0.16 7.96 10.04 8.5 8. 84 3.57 2.49 0.71 46.59 1963 2.91 5.83 1.46 1.4 6.82 7.42 6.89 2.01 5. 43 2.71 7.98 2.17 53.03 1964 5.29 2.65 4.84 3.61 2.58 4.73 7.67 10.8 11. 4 3.54 3.13 2.52 62.76 1965 2.22 3 3.05 1 0.08 9 3.72 2.97 4.33 3.65 0.97 2.14 36.13 1966 2.89 5.58 0.36 2.56 6.77 15.2 7.09 7.93 4. 49 4.6 1.19 1.6 60.25 1967 1.26 3.98 0.31 0 0.73 7.51 9.04 3.02 5. 56 0.19 0 2.98 34.58 1968 0.42 1.73 1.79 0.4 4.79 14.4 6.25 11.1 6. 07 7.44 2.43 1.38 58.17 1969 1.53 2.03 2.74 0.12 6.47 2.47 2.61 9.4 8. 89 6.97 1.96 5.03 50.22 1970 3.94 3.79 3.59 2.08 1.68 2.62 3.65 3.61 3. 54 3.87 0.31 0.72 33.4 1971 0.61 5.48 2 2.57 3.12 4.73 3.2 3.97 7. 2 9.53 1.33 2.49 46.23 1972 2.37 3.97 6.66 1.41 4.02 7.06 3.22 8.29 0. 42 3.08 10.96 2.48 53.94 1973 4.66 2.02 2.63 3.09 2.41 4.32 4.69 7.58 5. 14 4.4 0.75 2.54 44.23 1974 0.3 1.1 3.19 0.44 2.66 8.65 6.31 9.96 10. 5 1.42 0.48 2.2 47.21 1975 1.66 2.27 1.52 2. 96 2.99 9 6.89 3.16 6. 61 5.84 1.46 0.83 45.19 1976 0.6 0.7 2.03 4. 27 12.33 11.1 1.07 3.8 5.1 1.9 3.38 6 52.32 1977 4.69 2.45 1.43 0.41 4.61 1.15 2.23 7.91 6. 55 1.46 3.04 4.74 40.67 1978 2.89 5.98 2.31 3.3 0.56 7.48 5.53 7.99 4. 63 8.31 0.07 4.89 53.94 1979 7.1 1.94 4.08 3.96 6.13 3.03 11.69 5.24 15. 2 2.13 7.96 0.56 69.02 1980 3.75 0.76 2.41 2.54 3.62 5.57 5.82 4.13 1. 83 2.42 3.12 1.39 37.36 1981 0.32 5.54 3 0.29 1.74 1.03 4.69 7.19 7. 59 1.08 2.57 4.64 39.68 1982 2.46 2.08 5.81 6.04 4.68 8.29 5.31 3.21 4. 96 3.23 1.58 2.53 50.18 1983 2.51 5.96 7.71 6. 17 3.86 6.37 1.92 6.82 8.57 10.1 2.01 12 73.99 1984 1.46 3.44 1.31 5.29 6.04 2.84 6.77 4.02 10. 7 1.09 3.52 0.2 46.71 1985 0.79 0.58 1.49 3.14 3.42 6.81 2.16 9.83 10. 6 4.08 0.41 2.05 45.38 1986 7.16 1.28 1.85 0.44 0.99 3.5 14.43 3.47 3. 58 3.47 5.08 2.76 48.01 1987 2.21 6.64 7.94 0.28 2.65 3.81 2.78 4.89 5. 63 2.77 5.87 0.25 45.72



### Florida Department of Environmental Protection 85Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients

Annual Year(s) Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Totals

1988 5.36 1.72 4.57 1.68 1.78 2.39 2.94 4.79 6. 81 1.24 6.7 0.93 40.91 1989 6.82 0.64 2.01 2.92 2.02 1.84 2.44 4.47 5. 04 11.6 0.88 3.93 44.65 1990 1.42 5.61 1.94 1. 48 1.45 2.71 5.85 7 1. 61 5.88 0.83 0.34 36.12 1991 2.25 1.65 8.11 5.57 6.79 12.7 11.97 7.6 5. 52 2.94 0.61 1.51 67.19 1992 2.42 1.71 2.28 2.81 3.13 10.6 0.16 8.86 6. 57 5.21 2.15 0.47 46.41 1993 4.29 3.02 5.56 0.33 0.65 2.19 5.05 2.66 2. 74 5.53 1.83 1.86 35.71 1994 5.6 2.66 3.44 5.05 3.09 6.54 6.91 7.08 5. 93 4.72 12.91 2.71 66.64 1995 1.53 1.39 2.01 1.34 1.26 6.61 6.59 10.7 14. 1 3.99 1.44 3.44 54.44 1996 5.53 1.32 12.15 2.22 2.28 11.4 1.9 5.7 3. 92 11.2 0.96 2.01 60.49 1997 2.03 0.46 2.3 3.3 3.77 6.38 7.69 7.91 4. 78 5.29 3.02 7.76 54.69 1998 4.33 7.25 3.97 0.14 0.16 0.83 5.63 7.56 5. 79 1.84 1.66 1.35 40.51 1999 4.88 1.81 1.01 1.48 1.47 8.54 4.03 3.58 7. 05 7.84 3.12 1.56 46.37 2000 1.8 0.65 8.48 1.15 0.32 3.08 5.09 3.17 13. 6 0.93 1.14 0.8 40.16 2001 0.88 0.38 9.98 0.28 1.77 5.26 9.55 3.57 16. 1 3.22 6.92 0.35 58.27 2002 2.01 2.76 1.51 2.53 1.66 12.3 7.35 11.6 3. 86 2.94 1.85 9.61 59.94 2003 0.51 5.17 10.57 0.81 0.96 7.05 7.3 6.55 4. 15 7.95 4.75 1.53 57.3 2004 1.25 4.47 1.1 1. 19 0.49 5.2 10.34 18 16. 5 1.34 0.93 2.24 62.97 2005 2.6 1.25 5.51 3.17 7.97 13.7 2.73 4.29 7. 35 13.5 1.87 1.85 65.77 2006 0.24 4.33 0.08 1.11 0.78 5.72 4.48 4.81 2. 97 2.53 1.1 3.21 31.36

Max value 7.16 9.13 12.15 7.12 12. 33 15.2 14.43 19.9 16. 5 13.5 12.91 12 79.29

Min value 0.15 0.38 0.08 0 0. 08 0.83 0.16 2.01 0. 42 0.19 0 0.06 31.36
Mean 2.52 2.89 3.66 2. 37 2.89 6.15 5.65 6.48 6. 92 4.9 2.66 2.48 49.58 Median 2.21 2.13 2.63 2.22 2.4 6.37 5.56 5.7 5.93 3.87 1.87 2.01 47.22 # years 59 59 59 59 59 59 59 59 59 59 59 59 59

FLAGS: a = 1, b = 2, c = 3, ..., or z = 26 or more missing days Rainfall is in inches, and represents data from Daytona Beach International Airport.



### Florida Department of Environmental Protection 86Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



## Appendix J: Annual and Monthly Average Precipitation at Daytona International Airport



# DIA ANNUAL RAINFALL

0 10 20 30 40 50 60 70 80 9019481951195419571960196319661969197219751978198119841987199019931996199920022005



## YEARRAINFALL (INCHES) LONG-TERM AVERAGE



# MONTHLY AVERAGE RAINFALL

0 1 2 3 4 5 6 7 8

JAN FEB MA R APR M AY JUN J U

L AUG SE P O CT N OV D EC



## MONTHRAINFALL (INCHES)

MONTHLY AVERAGE



### Florida Department of Environmental Protection 87Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



## Appendix K: Response to Comment s Following the January 15, 2008 Public Meeting

Florida Department of Environmental Protection 88Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



### Response to comments on the TMDL for Nutrients and Dissolved Oxygen: WBID 2674A Comment 1. Following the January 15, 2008 public workshop, Ms. Kelly Young of the Volusia County Environmental Health Laboratory provided a spreadsheet of water quality data collected in this WBID. The Department had not assigned station VEMDVC – 071 to this WBID so information contained in Florida STORET from this station was not used in the original assessment or draft TMDL. With the exception of this station, data collected by the County that was part of Legacy STORET or Florida STORET was used. Data from this station along with some additional data that were not previously entered into STORET were incorporated into the present TMDL. As a result, the percent reduction in total phosphorus from anthropogenic sources changed from 32 to 27. Comment 2. Principal land uses illustrated in Figure 4.3 and summarized in Table 4.1 were based on the 2004 land use coverages provided to the Department from the St. Johns Water Management District and represent the most current coverage made available to the Department. The land use figure and table were presented to illustrate the general features of the watershed and were not used in the establishment of the TMDL. The percent reduction calculations were based upon water quality measurements taken at ambient stations located along Spruce Creek. Section 4.3 of the document identified Potential sources that might contribute nutrients and BOD to Spruce Creek. Acreage information from the land use summary was used to obtain estimates of potential nutrient contributions from these activities. As part of the BMAP process, updated and more detailed land use information could assist in further refining pollutant sources and cost effective measures to reduce these pollutants.

Florida Department of Environmental Protection 89Final TMDL Report: Spruce Creek, WBID 2674A, Upper East Coast Basin, Dissolved Oxygen and Nutrients



### Florida Department of Environmental Protection 90 Comment 3. We agree that the linear regression between phosphorus and DO may reflect an indirect relationship, however, it does not mean that the TMDL should be delayed. Monitoring should be a component of the basin management action plan (BMAP), particularly as part of a more detailed source identification element and assessment of cost effective strategies to reduce nutrients and BOD contributions from anthropogenic activities in the watershed. This would provide an opportunity to test and confirm the relationship between DO and phosphorus concentrations and the system response to reductions in these pollutants as best management practices are implemented.

### Florida Department of Environmental Protection Division of Water Resource Management Bureau of Watershed Management 2600 Blair Stone Road, Mail Station 3565 Tallahassee, Florida 32399-2400 www.dep.state.fl.us/water/