MWRA Annual CSO Progress Report 2014 This is the 19 th annual report. - PowerPoint PPT Presentation

MWRA Annual CSO Progress Report 2014 This is the 19 th annual report. Report includes: • Progress in 2014 and Q1 2015 • CSO control achievements and benefits to-date • Remaining activities and court/regulatory requirements • Spending, updated costs and schedules. 45

MWRA’s Approved Long-Term CSO Control Plan • 35 projects address site specific conditions • $898 million total capital cost (Prop. FY16 CIP) • 20-year implementation schedule (1996-2015) • >100 CSO milestones in federal court order require full implementation by 2015 and performance assessment by 2020 46

Summary of Achievements to Date  32 of 35 projects in the CSO plan are complete.  Last 3 projects are well into construction.  CSO is eliminated at 38 of 84 CSO outfalls.  Average annual CSO volume is reduced by 86%. (3.3 billion gallons in 1988 to 0.45 billion gallons today) Goal is 0.40 billion gallons.  89% of the remaining volume is treated at MWRA’s four CSO facilities. 47 Goal is 93% treated.

Construction Progress MWRA spent $22.1 million on CSO projects in calendar year 2014 . • 47,550 linear feet (9 miles) of drain and sewer pipe in 2014. • 497,500 linear feet (94.2 miles) of drain and sewer pipe since 1996. • 48

$69M BWSC Reserved Channel Sewer Separation 3 of 4 major sewer separation contracts are substantially complete. Contract 4 complete this month. Remaining work on schedule for completion by Dec 2015 49 court milestone.

$2.7M Outfall MWR003 Gate and Siphon Relief Construction is 40% complete. 50

$94M Cambridge CAM004 Sewer Separation All work on schedule for completion by Dec 2015 court milestone. 51

Progress in 2014: City of Chelsea Closes Outfall CHE002 52

Lower CSO Discharges Since 1988 53

CSO Program Cost and Spending FY15 CIP: $892.4 M Prop. FY16 CIP: $898.3 M Total CSO Program Community Projects Prop. FY16 CIP Budget $ 898.3 M $ 413.6 M Spent thru Jan 2015 $ 867.1 M $ 386.1 M Remaining to be spent $ 31.2 M $ 27.5 M Remaining Work: – Complete last three CSO projects in 2015. – Close out construction contracts and perform final eligibility reviews. – Continue to comply with Charles R. and Alewife/Upper Mystic R. CSO variances. – Assess system performance and verify attainment of long-term levels of control by Dec 2020. 54

Change in Charles River Water Quality Over Time 1989-1999 2008 - 2014 Samples collected from: Upper Charles Basin Downstream of Esplanade Watertown Dam to BU Bridge Science Museum to New Charles Dam 56% 82% Dry / Damp Dry / Damp 95% 97% 38% 80% Light Rain Light Rain 83% 100% 11% 48% Heavy Rain Heavy Rain 51% 83% Samples meeting 104 limit Samples meeting 104 limit Mid-basin Charles River mouth BU Bridge to Science Museum North End/Coast Guard Base 81% 93% Dry / Damp Dry / Damp 96% 97% 73% 96% Light Rain Light Rain 94% 95% 32% 55% Heavy Rain Heavy Rain 72% 86% Samples meeting 104 limit Samples meeting 104 limit 55 Graphs show the percent of samples meeting the Enterococcus bacteria limit for swimming, by river reach.

Change in Mystic River Water Quality Over Time Samples collected from: 1989-1999 2008-2014 Alewife Brook Lower Mystic mainstem Little River to Alewife confluence Rt 16 bridge to Earhart Dam 95% 20% Dry / Damp Dry / Damp 99% 55% 95% 15% Light Rain Light Rain 91% 39% 9% 68% Heavy Rain Heavy Rain 63% 12% Samples meeting 104 limit Samples meeting 104 limit Upper Mystic Mainstem Mystic River mouth Mystic Lakes to Medford Sq. Earhart Dam to Tobin Bridge 81% 88% Dry / Damp Dry / Damp 94% 93% 45% 74% Light Rain Light Rain 74% 87% 31% 55% Heavy Rain Heavy Rain 42% 65% Samples meeting 104 limit Samples meeting 104 limit Graphs show the percent of samples meeting the Enterococcus bacteria limit for swimming, by river reach. 56

Change in Neponset River Water Quality Over Time Samples collected from: 1989-1999 2008 - 2014 Lower Mills Dam Lower Neponset Baker Dam, Milton/Dorchester Rt 3A bridge to Old Colony YC 21% 65% Dry / Damp Dry / Damp 90% 87% 14% 45% Light Rain Light Rain 57% 62% 7% 37% Heavy Rain Heavy Rain 37% 44% Samples meeting 104 limit Samples meeting 104 limit Neponset River mouth Granite Ave Bridge Southern Dorchester Bay Near I-93, Milton/Dorchester 50% Dry / Damp 97% Dry / Damp 78% 100% 34% Light Rain 96% Light Rain 59% 93% 15% Heavy Rain 65% Heavy Rain 48% 79% Samples meeting 104 limit Samples meeting 104 limit Graphs show the percent of samples meeting the Enterococcus bacteria limit for swimming, by river reach. 57

South Boston Beaches Meet Bacteria Limits on More Sampling Days 2011 - 2014 2006 - 2010 100% of samples met limits in 2014 82% 96% TUNNEL START-UP MAY 2011 20% % of samples failing limit 18% 15% 10% 5% 4% 0% 2006 - 2010 2011 - 2014 58

Changes in Boston Harbor Bacteria Levels in Wet Weather Prior to Boston Harbor projects (1989-1991) Most Boston Harbor projects complete (post-2007) Contours show the geometric means of Enterococcus data collected when more than 0.2 inches of rain fell in the previous day. Blue areas meet the EPA geometric mean swimming standard and red-purple areas exceed the standard. First panel shows data from 1989 to 1991, second panel shows data for 2008 – 2013. 59

Remaining Federal Court Milestones (Schedule Seven) October 2015: Complete construction of Gate, Siphon Relief and Floatables Control at Outfall MWR003 December 2015: Complete construction of CAM004 Sewer Separation Complete construction of Reserved Channel Sewer Separation March 2016: Submit annual progress report (for 2015) January 2018: Commence 3-year performance assessment, including post-construction monitoring December 2020: Submit results of 3-year performance assessment to demonstrate attainment of long-term levels of CSO 60 control