EVALUATION OF SANITARY SEWER OVERFLOWS AND UNPERMITTED DISCHARGES ASSOCIATED WITH HURRICANES HERMINE & MATTHEW JANUARY 6, 2017 THIS PAGE WAS LEFT BLANK INTENTIONALLY EVALUATION OF SANITARY SEWER OVERFLOWS AND UNPERMITTED DISCHARGES ASSOCIATED WITH HURRICANES HERMINE & MATTHEW Financial Project No.: January 6, 2017 PR9792143-V2 RS&H No.: 302-0032-000 Prepared by RS&H, Inc. at the direction of the Florida Department of Environmental Protection ii THIS PAGE WAS LEFT BLANK INTENTIONALLY TABLE OF CONTENTS Chapter 1 INTRODUCTION ............................................................................................................................................................... 1 1.1 SCOPE OF THE EVALUATIONS..................................................................................................................................... 1 1.2 METHODOLOGY ............................................................................................................................................................... 2 1.3 DOCUMENT OVERVIEW ................................................................................................................................................ 2 Chapter 2 STORMWATER AND WATER LEVEL ANALYSIS .................................................................................................... 3 2.1 PRECIPITATION DATA .................................................................................................................................................... 3 2.1.1 Hurricane Hermine .................................................................................................................................................... 3 2.1.2 Hurricane Matthew ................................................................................................................................................... 6 2.2 TIDAL SURGE ................................................................................................................................................................... 11 2.2.1 Hurricane Hermine ................................................................................................................................................. 11 2.2.2 Hurricane Matthew ................................................................................................................................................ 14 2.3 FEDERAL INSURANCE RATE MAPS ......................................................................................................................... 18 Chapter 3 UTILITY, HURRICANE IMPACTS AND SSO DISCUSSIONS ............................................................................ 22 3.1 CITY OF ST. PETERSBURG ........................................................................................................................................... 22 3.1.1 Utility Description ................................................................................................................................................... 22 3.1.2 Conditions Associated with Hurricane Hermine .......................................................................................... 24 3.1.3 Unauthorized Discharge Overview and Review of FDEP Reported Data .......................................... 24 3.1.4 Interviews with the City of St. Petersburg Water Resources Department ......................................... 25 3.2 CITY OF GULFPORT ...................................................................................................................................................... 27 3.2.1 Utility Description ................................................................................................................................................... 27 3.2.2 Conditions Associated with Hurricane Hermine .......................................................................................... 29 3.2.3 SSO Overview and Review of FDEP Reported Data.................................................................................... 29 3.2.4 Interviews with the City of Gulfport Public Works Department ............................................................ 29 3.3 CITY OF LARGO .............................................................................................................................................................. 30 3.3.1 Utility Description ................................................................................................................................................... 30 3.3.2 Conditions Associated with Hurricane Hermine .......................................................................................... 31 3.3.3 SSO Overview and Review of FDEP Reported Data.................................................................................... 31 3.3.4 Interviews with the City of Largo Public Works Department ................................................................. 31 3.4 PINELLAS COUNTY ........................................................................................................................................................ 32 3.4.1 Utility Description ................................................................................................................................................... 32 3.4.2 Conditions Associated with Hurricane Hermine .......................................................................................... 32 3.4.3 SSO Overview and Review of FDEP Reported Data.................................................................................... 33 3.4.4 Interviews with Pinellas County Utilities ......................................................................................................... 33 3.5 CITY OF CLEARWATER ................................................................................................................................................. 34 i THIS PAGE WAS LEFT BLANK INTENTIONALLY 3.5.1 Utility Description ................................................................................................................................................... 34 3.5.2 Conditions Associated with Hurricane Hermine .......................................................................................... 35 3.5.3 SSO Overview and Review of FDEP Reported Data.................................................................................... 35 3.5.4 Interviews with the City of Clearwater Public Works ................................................................................. 35 3.6 JEA ....................................................................................................................................................................................... 37 3.6.1 Utility Description ................................................................................................................................................... 37 3.6.2 Conditions Associated with Hurricane Matthew ......................................................................................... 39 3.6.3 SSO Overview and Review of FDEP Reported Data .................................................................................... 39 3.6.4 Interviews with the JEA Representatives ......................................................................................................... 40 3.7 CITY OF ST. AUGUSTINE ............................................................................................................................................. 44 3.7.1 Utility Description ................................................................................................................................................... 44 3.7.2 Conditions Associated with Hurricane Matthew ......................................................................................... 45 3.7.3 SSO Overview and Review of FDEP Reported Data.................................................................................... 46 3.7.4 Interviews with the City of St. Augustine Public Works Department .................................................. 47 3.8 SUMMARY OF FAILURE MODES ............................................................................................................................. 50 Chapter 4 EMERGENCY RESPONSE PLANS AND INDUSTRY BMPS .............................................................................. 53 4.1 TEN STATE STANDARDS ............................................................................................................................................ 53 4.2 EPA GUIDELINES ............................................................................................................................................................ 54 4.3 EMERGENCY RESPONSE PLANS RELATIVE TO FAILURE MODES ............................................................... 55 4.3.1 City of St. Petersburg ............................................................................................................................................. 55 4.3.2 City of Gulfport ......................................................................................................................................................... 56 4.3.3 City of Largo ............................................................................................................................................................... 56 4.3.4 Pinellas County ........................................................................................................................................................