Prepared for Paulding County, Georgia Source Water Assessment Plan Richland Creek Reservoir Water Supply Program August 15, 2017 Prepared by Brown and Caldwell 990 Hammond Dr., Suite 400 Atlanta, GA 30328 T: 770.394.2997 F: 770.396.9495 Source Water Assessment Plan for Paulding County Richland Creek Reservoir Water Supply Program Prepared for Paulding County Water, Paulding County, Georgia August 2017 . 990 Hammond Drive, Suite 400 Atlanta, Georgia 30328 Table of Contents List of Figures ............................................................................................................................................... v List of Tables ............................................................................................................................................... vi List of Abbreviations ................................................................................................................................... vii Executive Summary ............................................................................................................................... ES-1 Assessment Process ...................................................................................................................... ES-1 Source Water Assessment Area .................................................................................................... ES-1 Drinking Water Susceptibility ........................................................................................................ ES-3 Reservoir Watershed ........................................................................................................... ES-3 Raw Water Intake Watershed ............................................................................................. ES-3 Recommendations ......................................................................................................................... ES-3 1. Project Overview ................................................................................................................................1-1 1.1 Background Information.........................................................................................................1-1 1.1.1 Richland Creek Reservoir Water Supply Program ..................................................1-1 1.1.2 Water Withdrawal Permits .......................................................................................1-3 1.1.3 Water Supply Watershed Description .....................................................................1-3 1.2 Distributing Plan to Public ......................................................................................................1-8 1.3 Regulatory Requirements for Source Water Assessment Plans ..........................................1-8 1.3.1 Responsibility for Conducting Source Water Assessments ...................................1-8 1.3.2 Assessment Area ......................................................................................................1-8 1.3.3 Assessment Requirements ................................................................................... 1-10 2. Source Water Assessment Methodology .........................................................................................2-1 2.1 Watershed Delineation ...........................................................................................................2-1 2.1.1 Reservoir Watershed ................................................................................................2-1 2.1.2 Raw Water Intake Watershed ..................................................................................2-1 2.2 Available Water Quality Data ..................................................................................................2-3 2.2.1 303(d) Listed Waters ...............................................................................................2-3 2.2.2 Cryptosporidium and Giardia ...................................................................................2-5 2.2.3 Other Water Quality Data .........................................................................................2-5 2.3 Potential Pollution and Contaminant Source Inventory .......................................................2-6 2.3.1 Land Cover ................................................................................................................2-7 2.4 Susceptibility Determination ..................................................................................................2-7 2.4.1 Point Sources ............................................................................................................2-8 2.4.2 Overall Susceptibility Ranking .................................................................................2-9 ii DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the end of this document. SWAP_Paulding_Final.docx Source Water Assessment Plan – Paulding County Richland Creek Reservoir Table of Contents 2.5 Assessment Assumptions ................................................................................................... 2-10 2.5.1 General Assumptions ............................................................................................ 2-10 2.5.2 Industrial Point Sources ........................................................................................ 2-11 2.6 Non-Point Pollution Sources Assessed ............................................................................... 2-11 2.6.1 Agriculture .............................................................................................................. 2-11 2.6.2 Forestry .................................................................................................................. 2-11 2.6.3 Urban ...................................................................................................................... 2-12 2.6.4 Non-Sewer (Septic) ................................................................................................ 2-12 2.7 Point Pollution Sources Assessed....................................................................................... 2-12 2.7.1 Agricultural Waste Lagoons .................................................................................. 2-12 2.7.2 Confined Animal Feedlot Operations ................................................................... 2-12 2.7.3 Airports ................................................................................................................... 2-12 2.7.4 Industries, Manufacturing Facilities, and Businesses ........................................ 2-13 2.7.5 Landfills and Garbage Transfer Stations ............................................................. 2-13 2.7.6 Lift Stations ............................................................................................................ 2-13 2.7.7 Land Application Systems ..................................................................................... 2-13 2.7.8 Mining .................................................................................................................... 2-14 2.7.9 Roadways ............................................................................................................... 2-14 2.7.10 Railways ................................................................................................................. 2-15 2.7.11 Sewer Pipelines Adjacent to or Crossing Streams/Sewer Areas ........................ 2-15 2.7.12 Oil Pipelines Adjacent to or Crossing Streams .................................................... 2-15 3. Susceptibility Results ........................................................................................................................3-1 3.1 Reservoir Watershed ..............................................................................................................3-1 3.1.1 Roadways ..................................................................................................................3-1 3.1.2 Non-Sewer Areas (Septic) ........................................................................................3-1 3.2 Raw Water Intake Watershed ................................................................................................3-2 3.2.1 Non-Point Source Assessment ................................................................................3-2 3.2.2 Urban .........................................................................................................................3-2 3.2.3 Non-Sewer (Septic) ...................................................................................................3-2 3.3 Point Source Assessment.......................................................................................................3-9 3.3.1 Confined Animal Feedlot Operations ......................................................................3-9 3.3.2 Agricultural Waste Lagoons .....................................................................................3-9 3.3.3 Airports ......................................................................................................................3-9 3.3.4 Roadways ..................................................................................................................3-9 3.3.5 Railways ................................................................................................................. 3-12 3.3.6 Industries, Manufacturing and Businesses ........................................................