Final - Massachusetts Water Resources Authority

FES/FERSBiofilters Design& ConstructionNut IslandControl SystemEvaluation andDesignSystem-wideOdor ControlFES/FERS Corrosion Control (Biofilters) is a design and construction project to makeimprovements in the MWRA sewers. Three air treatment systems (biolfilters) arerecommended to remove and treat hydrogen sulfide in the FES, FERS, WESR and WERSsewer systems. Rehabilitation of hydrogen sulfide meters will be included.Odor control is now being reliably performed using carbon. Modifications to the existingsystem are required to improve long term performance and ability to quickly transfer toback-up system. Odor control system should be evaluated and redesigned to ensure odorcontrol performance in order to avoid air quality violations and odor complaints.The prevalence of Hydrogen Sulfide gas in the collection system has been responsible forsystem wide odor complaints and infrastructure deterioration. This project will evaluatethe system, identify the critical needs, and provide solutions.Expenditure Forecast (in $000s) and Project StatusTotalBudgetPaymentsthru FY10RemainingBalanceFY11 FY12 FY09-13 FY14-18 BeyondFY18$16,782 $3,003 $13,780 $0 $0 $275 $12,504 $1,000ProjectStatus5/1117.9%Status as % is approximation based on project budget and expenditures.Changes to Project Scope, Budget, and ScheduleProject Cost Scheduled Completion Date FY09-13 SpendingFY11 FY12 Chge. FY11 FY12 Chge. FY11 FY12 Chge.$14,647 $16,782 $2,135 Jun-17 Jun-17 None $325 $275 ($50)Explanation of ChangesCost increase primarily due to new projects for Nut Island Control System Evaluation Design and System-wideOdor Control.CEB ImpactCEB impact from the FERS Biofilters Project that was placed in the CIP. The cost of FERS chemicals(Nitrazyme and VX456) would be approximately reduced in half. The impact of this project would beapproximately ($35,000) in FY16.Interception and Pumping - 24