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Magnolia Estates Public Water Supply (Serving: Magnolia Estates Subdivision )

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Magnolia Estates Public Water Supply (Serving: Magnolia Estates Subdivision ) Magnolia Estates Public Water Supply (serving: Magnolia Estates Subdivision ) PWS ID # MT0004021 SOURCE WATER DELINEATION AND ASSESSMENT REPORT Date of Report: April 2008 Report Prepared For: Magnolia Estates Jeff McCleary, Operator Barbara Howell, Administrative Contact 7501 Gardenia Drive Missoula, Montana 59808 Report Prepared By: Jeffrey Frank Herrick Source Water Protection Program Montana Department of Environmental Quality P.O. Box 200901 Helena, Montana 59620-0901 Magnolia Estates PWS # MT0004021 Draft SWDAR TABLE OF CONTENTS TABLE OF CONTENTS .........................................................................................................................II INTRODUCTION..................................................................................................................................... 4 PURPOSE .................................................................................................................................................. 4 LIMITATIONS............................................................................................................................................ 4 BACKGROUND ....................................................................................................................................... 5 THE COMMUNITY..................................................................................................................................... 5 GEOGRAPHIC SETTING ............................................................................................................................. 5 Table 1. Climatic Data .................................................................................................................... 5 DESCRIPTION OF THE SOURCE WATER ..................................................................................................... 5 THE PUBLIC WATER SUPPLY ................................................................................................................... 6 Table 2. PWS Facilities and Well Information.............................................................................. 7 WATER QUALITY ..................................................................................................................................... 7 DELINEATION ........................................................................................................................................ 8 DELINEATION PROCESS............................................................................................................................ 8 HYDROGEOLOGIC CONDITIONS................................................................................................................ 8 Table 3. Sources of Hydrogeologic Information ............................................................................ 8 Geologic Setting.................................................................................................................................. 9 Aquifer Properties............................................................................................................................. 10 Table 4. Summary of Aquifer Test Results .................................................................................. 11 PWS SOURCE INFORMATION ................................................................................................................. 12 Table 5. PWS Source/Well Information ...................................................................................... 12 Table 6. Summary of Inputs and Results for Time-of-Travel Calculation................................... 13 DELINEATION RESULTS.......................................................................................................................... 13 LIMITING FACTORS ................................................................................................................................ 13 INVENTORY .......................................................................................................................................... 15 INVENTORY METHOD............................................................................................................................. 15 INVENTORY RESULTS............................................................................................................................. 16 Control Zone ..................................................................................................................................... 16 Inventory Region............................................................................................................................... 16 Recharge Region............................................................................................................................... 17 Table 7. Potential Contaminant Sources...................................................................................... 17 INVENTORY UPDATE.............................................................................................................................. 18 INVENTORY LIMITATIONS ...................................................................................................................... 18 SUSCEPTIBILITY ASSESSMENT ..................................................................................................... 19 GENERAL DISCUSSION ........................................................................................................................... 19 HAZARD DETERMINATION ..................................................................................................................... 19 Table 8. Determination of Hazard for potential contaminant sources......................................... 19 Table 9. Susceptibility, Based on Hazard and Barriers ............................................................... 20 DISCUSSION OF SUSCEPTIBILITY ............................................................................................................ 20 Page ii of 35 Magnolia Estates PWS # MT0004021 Draft SWDAR SUMMARY OF SUSCEPTIBILITY ASSESSMENT ......................................................................................... 20 Table 10. Susceptibility Assessment............................................................................................ 22 REFERENCES........................................................................................................................................ 27 GLOSSARY............................................................................................................................................. 29 FIGURES................................................................................................................................................. 31 APPENDICES......................................................................................................................................... 32 APPENDIX A........................................................................................................................................... 32 DEQ PWS’s Database Output (for Magnolia Estates)..................................................................... 32 List of PWS Facilities................................................................................................................... 32 Sampling Schedule........................................................................................................................ 32 Water Quality Data ....................................................................................................................... 32 APPENDIX B........................................................................................................................................... 33 Sanitary Surveys................................................................................................................................33 Well Log Information........................................................................................................................ 33 Other Relevant Well Information...................................................................................................... 33 APPENDIX C........................................................................................................................................... 34 Concurrence Letter ........................................................................................................................... 34 APPENDIX D........................................................................................................................................... 35 PWS-6 Report / SWDAR for Flying H Event Center (2007)............................................................ 35 Page iii of 35 Magnolia Estates PWS # MT0004021 Draft SWDAR INTRODUCTION This Delineation and Assessment Report was completed by Jeffrey Frank Herrick, a hydrogeologist with the Montana Department of Environmental Quality (DEQ) – Source Water Protection Program (SWPP). This report was prepared for: Magnolia Estates – Public Water Supply providing water to the Magnolia Estates Subdivision 7501 Gardenia Drive Missoula, Montana 59808 Purpose This report is intended to meet the technical requirements for the completion of the delineation and assessment report for the Magnolia Estates PWS (public water supply), which provides water to Magnolia Estates subdivision. This is required by the Montana Source Water Protection Program (DEQ, 1999) and the federal Safe Drinking Water Act (SDWA) Amendments
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