Water Supply Study
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City of Augusta, Kansas Water Supply Study April 16, 2012 clean & pure - pure & simple Aqua Tech Engineering Consultants Augusta, Kansas 11-22-03-01 CITY OF AUGUSTA, KANSAS WATER SUPPLY STUDY TABLE OF CONTENTS PART I………………………………………………………………………………... 1 A. INTRODUCTION…………………………………………………….…………. 1 B. PURPOSE...…………………………………………………………….……….. 1 PART II…………………………………………………………………….…………. 1 A. GENERAL………………………………………………………………………. 1 B. POPULATION TRENDS AND GROWTH AREAS…………………………… 1 PART III...……………………………………………………………………………. 1 A. GENERAL………………………………………………………………………. 1 B. SAFE DRINKING WATER ACT………………………………………………. 1 C. CURRENT WATER QUALITY REGULATIONS…………………………….. 2 D. KANSAS ANTIDEGRADATION POLICY……………………………………. 2 E. ARSENIC………………………………………………………………………... 4 F. RADIONUCLIDES……………………………………………………………… 5 G. SURFACE WATER TREATMENT RULE…………………………………….. 6 H. INTERIM ENHANCED SURFACE WATER TREATMENT RULE…………. 7 I. LONG TER 2 ENHANCED SURFACE WATER TREATMENT RULE………. 7 J. STAGE 1 DISINFECTANTS AND DISINFECTION BY-PRODUCTS RULE... 9 K. STAGE 2 DISINFECTANTS AND DISINFECTION BY-PRODUCTS RULE.. 11 L. KANSAS WATER APPROPRIATIONS ACT…………………………………. 13 PART IV……………………………………………………………………………… 1 A. RAW WATER SOURCES……...………………………………………………. 1 B. RAW WATER PIPELINES……………………………………………………... 5 C. CAPACITY OF THE EXISTING SYSTEM……………………………………. 9 D. AVAILABLE SUPPLY…………………………………………………………. 9 PART V………………………………………………………………………………. 1 A. GENERAL………………………………………………………………………. 1 B. EL DORADO LAKE AND PIPELINE…………………………………………. 2 C. AUGUSTA CITY LAKE………………………………………………………... 7 D. SANTA FE LAKE………………………………………………………………. 10 E. REUSE OF WASTEWATER TREATMENT PLANT EFFLUENT…………… 11 APPENDIX A - FIGURES APPENDIX B – REUSE ARTICLES TOC - 1 CITY OF AUGUSTA, KANSAS WATER SUPPLY STUDY LIST OF ABBREVIATIONS AND ACRONYMS ABBREVIATION MEANING OR ACRONYM Acre-Feet One foot of water over one acre = 325,829 gallons BAT Best Available Treatment Technology C-900 AWWA Standard C-900 that covers PVC Pipe 4" through 12" diameter C-905 AWWA Standard C-900 that covers PVC Pipe greater than 12" diameter CCR Consumer Confidence Report that is issued annually by Augusta CWS Community Water System DBP Disinfection By-Products DR Dimension Ration for HDPE Pipe - The outside diameter divided by the wall thickness (the lower the number, the thicker the wall) DWR Department of Agriculture Division of Water Resources Ft. TDH Total Dynamic Head expressed in Feet of Water - One foot of water = 0.43 psi gpm Gallons per Minute GUDI Groundwater Under the Direct Influence of Surface Water HAA5 5 of the Haloacetic Acids, which are DBPs Hazen-Williams C A friction factor, usually between 100 and 153, that represents the Value assumed resistance against flow by the inside wall of a pipe HDPE High Density Polyethylene Pipe IESWTR Interim Enhanced Surface Water Treatment Rule KBS Kansas Biological Survey KDHE Kansas Department of Health & Environment KWO Kansas Water Office LT2ESWTR Long Term 2 Enhanced Surface Water Treatment Rule MCL Maximum Contaminent Level MCLG Maximum Contaminent Level Goal mg/L Milligrams per Liter MGD Million Gallons per Day MGY Million Gallons per Year millirem One-thousandth of a rem, with a rem being the roentgen equivalent in man or mammel which is a unit of radiation dose equivalent, which is the product of the absorbed dose in rads and a weighting factor that accounts for the effectiveness of the radiation to cause biological damage. The rad is a unit of radiation dose that causes 100 ergs of energy to be absorbed by one gram of matter, such as tissue. An erg is a unit of energy equivalent to a force of one dyne exerted for one centimeter ABB - 1 ABBREVIATION MEANING OR ACRONYM MRDL Maximum Residual Disinfectant Level MRDLG Maximum Residual Disinfectant Level Goal NPDES National Pollutant Discharge Elimination System NTNCWS Non-transient Non-community Water System oocyst/L An oocyst is a is a spore that is able to survive for lengthy periods outside a host. Organisms that create oocysts include Cryptosporidium and Toxoplasma. pCi/L Picocuries per Liter, which is a unit of radioactivity. It takes one trillion picocuries to equal one curie. One curie is roughly the activity of 1 gram of the radium isotope 226Radium. The human body typically contains 100,000 picocuries of naturally occurring Potassium-40. psi Pressure in pounds per square inch PVC Polyvinyl Chloride Pipe SDWA Safe Drinking Water Act SWTR Surface Water Treatment Rule TDH Total Dynamic Head, which is the pressure that a pump will produce THM Triholomethanes, which are DBPs USACE U. S. Army Corps of Engineers USEPA U. S. Environmental Protection Agency ABB - 2 EXECUTIVE SUMMARY The existing sources of raw water to the City of Augusta Water Treatment Plant are El Dorado Lake, City Lake and Santa Fe Lake. The summer drought of 2011 made it necessary for the City of Augusta to implement a Mandatory Watering Restriction Program. This report therefore evaluates the long term raw water supply in order that an ample amount of potable water is available to the citizens of Augusta and its wholesale customers (Butler County Rural Water District No. 4, Butler County Rural Water District No. 6, the City of Mulvane and possibly peaking flows to the City of Rose Hill). The agreement to sell water to Mulvane expires between January 1 and April 1, 2031. It should be noted that it is not certain that they will continue to purchase water from Augusta after the agreement expires. Alternatives that are evaluated include increasing the capacity of the raw water pipeline from El Dorado to the Augusta Water Treatment Plant, thereby replacing its aged portion; withdrawing water from the Walnut River to help manage City Lake; and using the effluent from the Augusta Wastewater Treatment Plant as an additional source, either to City Lake or directly to the Water Treatment Plant. The planning period for the Report is from the year 2012 through 2062. The raw water supply system demand is determined by projecting population for the City of Augusta and its wholesale customers, applying average per capita per day use to the projected population, and application of a peaking factor of 2.5 to the average day use to calculate the maximum day finished water demand. The finished water demand is then increased by an amount of 7% to account for water that is used during treatment for sludge removal and filter backwash. The maximum day demand during specific years of historical usage may be less than calculated amounts depending on such thing as weather, water conservation practices, economic conditions during the year of analysis, fire fighting, and major line breaks. Population projections as based on Kansas Water Office information are shown in the following table: Population Projections Year Projected Population 2000 17,609 2010 19,986 2012 20,461 2022 22,838 2032 25,215 2042 27,592 2052 29,969 2062 32,346 ES - 1 Water demand projections that were developed using the above population projections for Augusta and its wholesale customers are shown in the following table: Annual Water Demand Projections Year Water Demand in MGY 2000 761 2010 862 2012 883 2022 984 2032 1,086 2042 1,189 2052 1,291 2062 1,393 The projected maximum day demands based on application of a peaking factor of 2.5 to the average day demands are presented in the following table: Maximum Day Water Demand Projections Year Water Demand in MGD 2000 5.2 2010 5.9 2012 6.0 2022 6.7 2032 7.4 2042 8.1 2052 8.8 2062 9.5 The projected maximum day demands that include the values from the above table and 1.1 MGD to Rose Hill are shown in the following table: Maximum Day Water Demand Projections With Rose Hill at 1.1 MGD After 2010 Year Water Demand in MGD 2000 5.2 2010 5.9 2012 7.1 2022 7.8 2032 8.5 2042 9.2 2052 9.9 2062 10.6 ES - 2 Applicable regulations were reviewed with respect to their impact on the water supply for the City. It should be noted that the City is in full compliance with all regulatory monitoring and associated dates. Regulations reviewed were the Safe Drinking Water Act (SDWA), the Kansas regulations that pertain to the SDWA, Kansas Antidegradation Policy, the Federal Arsenic and Radionuclides Standards, the Surface Water Treatment Rules, the Disinfectants and Disinfection By-Products Rules, and the Kansas Water Appropriations Act. This review was done with respect to their applicability to withdraw of water from the Walnut River and reuse of effluent from the Augusta Municipal Wastewater Treatment Plant. Various testing would be necessary to determine that the water from the Walnut River is compatible with the water in the City Lake. The Kansas Antidegradation Policy would not allow reuse of the wastewater plant effluent through the City Lake. The KDHE indicated that they will not allow use of the wastewater plant effluent as a source of raw water to the water plant. The following is a summary of the current water rights that the City owns (water is purchased from El Dorado Lake from the City of El Dorado, therefore Augusta has no water right associated with the El Dorado Lake): Water Rights Use Summary Water Allowable Allowable Effective Right Rate Quantity Notes Date File No. (gpm) (MGY) Vested BU 003 June 28, 1945 1,000 157.000 City Lake – See Below Vested BU 017 June 28, 1945 NA NA Santa Fe Lake for Storage Only Vested BU 018 June 28, 1945 NA 44.967 Santa Fe Lake Appropriated 21,148 August 8, 1973 1,200 450.000 Santa Fe Lake – See Below Appropriated 45,451 February 24, 2003 2,000 350.000 City Lake Water right 21,148 limits the total use of water from Santa Fe Lake at 711.000 MGY when combined with water rights BU 003 (City Lake), 2,726 and 6,655. 2,726 was later dismissed and file 6,655 was sold or given to another party. The net current allowed annual combined water use from 21,148 (SFL) and BU 003 (City Lake) is 651.967 MGY.