Streamline - Summer 2015 - (Page 7)

FromThePresident BY PAM BAUGHMAN, VRWA PRESIDENT A Disinfection Byproducts Odyssey Environmental Protection Agency (EPA) adopted the Stage 1 Disinfectants and Disinfection Byproducts Rule (DBP). The purpose of the Stage 1 Rule was to strengthen control of chemical disinfectants like chlorine (the known disinfectant for over 100 years) and the potentially cancer-causing byproducts in drinking water. IN 1998 THE The Stage 1 DBP Rules sets limits on two contaminants in drinking water created when chlorine is added to surface water with high levels of Total Organic Carbon (TOC) and Dissolved Organic Carbon (DOC). The Stage 1 DBP Rules sets limits on two contaminants in drinking water created when chlorine is added to surface water with high levels of Total Organic Carbon (TOC) and Dissolved Organic Carbon (DOC). Total Trihalomethanes (TTHM) and Haloacetic Acids (HAA5) form in chlorinated (a disinfectant) water as a result of the reaction that occurs when chlorine is added to water with high organic materials (decaying leaves, branches, grasses, trees etc.). The Stage 2 DBP Rules came into effect during the third quarter of 2014, further tightening the limits set by the Stage 1 DBP Rules, by implementing site specific compliance as opposed to a running annual average. Louisa County Water Authority (LCWA) remained in compliance, for the most part, with Stage 1 DBP Rules; however, when the stage 2 DBP Rules came into effect, the LCWA found it difficult to impossible to meet the regulation without some combination of water age reduction and Dissolved Organic Carbon removal. What did we do? In late 1999, the LCWA and the County of Louisa (County) negotiated Addendum 3 to the Buy-Sell Agreement with the Town of Louisa (Town). In that agreement, the Town agreed to allow a lease for 15 years at no cost to LCWA for the use of the wells and springs owned by Town. The cost to upgrade, maintain and operate the wells and springs would be the responsibility of LCWA and the County. LCWA intended to use the wells and springs as a supplemental source to blend with the Northeast Creek Water Treatment Plant (NECWTP) water. However, during our evaluation in 2010 of the wells, it was determined that the wells were contaminated with Tetrachloroethylene and also influenced by surface water; rendering them unsuitable for human consumption. In 2004, the first of two outside engineering reviews was conducted. This evaluation consisted of review of the current processes at the plant and distribution system. The evaluation consisted of historical data and treatability studies (jar testing). In 2009, LCWA contracted for an engineering report to evaluate DBP Reduction and the development of control strategies. Initially process changes were implemented at the NECWTP including enhanced coagulation (the reduction of pH in the treatment process). 6.2 Standard Units pH was indicated as the desirable level. Higher doses of Alum were also fed. Finally, the chlorine feed was relocated from pretreatment to applied treatment to reduce the contact time between the TOC and the chlorine. Simulated Distribution System testing (SDS) was conducted on the use of an alternative disinfectant called chloramines. The SDS testing with the use of chloramines did show a decrease in DBPs, but not significantly enough to ensure compliance. The Virginia Department of Health (VDH) determined that due to the operational schedule (start-up and shut-down daily) at the NECWTP, Chloramines would not be a viable option. Chloramines also produce DBPs that are currently unregulated, but will be within the next seven years; those DBPs are known in the utility business as "super bugs" and chloramines can cause corrosion in the distribution system, leading to lead and copper issues. 7

Table of Contents for the Digital Edition of Streamline - Summer 2015

From the President: A Disinfection Byproducts Odyssey
From the Executive Director: It’s Over
Importance of Professional Relationships in the Water and Wastewater Industry
Spring Cleaning … All Year Long
Region Meetings: the Next Big Thing
Preventing Heat-Related Illnesses
Virginia Source Water
USDA Rural Development
A Successful Model for Waterworks
Professional Licensing Update: News You Can Use
NRWA Recap
Tank Team Tackles Water Distribution
VRWA 2015 Conference Highlights
Town of Lovettsville Wins the ‘Great Water Taste Contest’
Throwing My Loop: Helpers in Our Path
Wastewater Crossword
VRWA Booster Club
e-Learning Benefits
Membership Application
Do You Know What Your VRWA Benefits Are?
VRWA Mailbag
New Members
Board of Directors
VRWA Committees
Index to Advertisers/

Streamline - Summer 2015