Comprehensive Sewer Surveys in 9 Basins

Transcription

1 Sanitary Sewer Overflow Consent Decree Presentation to Anacostia Watershed Management Committee Washington Suburban Sanitary Commission March 1,

2 Three Phases of SSO Consent Decree 2

3 Comprehensive Sewer Surveys in 9 Basins 4 SSESs completed (Broad Creek II, Cabin John, Beaverdam Branch, Piscataway) 5 SSESs underway (Northeast Branch, Parkway, Little Falls, Rock Run and Watts Branch) Collection System Model Computer modeling of at least 965 miles of sewer within five years Completed in

4 (Anacostia Watershed) Inspect 670 Miles (estimate) of Sewer Mains in Five Years CCTV inspected over 710 miles of sewer Inspect 220 Miles (estimate) of Large Sewer Mains (15 and Larger) via Video and Specialized Tests Trunk Sewer Inspection of over 220 miles of sewer Clean 670 Miles (estimated) of Sewers in Five Years Cleaned over 690 miles of sewer 4

5 (Anacostia Watershed) Basin Name Miles of Sewer Cleaned Miles of Sewer CCTV Miles of Trunk Sewer Inspected Beaverdam Branch Sligo Creek Lower Anacostia Northwest Branch Oxon Run Northeast Branch Paint Branch Total

6 Water Quality Monitoring Plan Semi-Annual Sampling (Bacterial a Source Tracking & Fecal- Indicator Bacteria Testing) Approved 2007 Identify human vs. non-human bacterial sources and determine whether sewer improvements are reflected in surface water quality 2 Locations/Sewer Basin (18 sample points in 9 Basins Lower Anacostia, Lower/Upper Beaverdam Creeks, Northeast Branch, Northwest Branch, Sligo Creek, Oxon Run, Paint Branch & Indian Creek) 6

7 Water Quality Monitoring Plan Semi-Annual Sampling Conducted Ten full rounds of sampling completed in past 5 years ( ). Quarterly sampling in Lower Anacostia, Sligo Creek, Northeast and Northwest Branch (4 year trial basis). Not Consent Decree required. Discontinued due to lack of statistically significant difference from semiannual sampling Monitoring to date has established typical range of background or baseline bacteria sources prior to SR3 Plan implementation. 7

8 Water Quality Monitoring Plan Summary of Results (typical (yp Bacteria Source Tracking distribution, all sewer basins) 8

9 Water Quality Monitoring Plan Summary of Results Anacostia Watershed BST Monitoring (206 samples) 80% 70% 66.5% Percentage of Samples 60% 50% 40% 30% 27.7% Less than 10% of samples exceed Water Quality Criteria for bacteria 20% 10% 5.8% 0% < Human Source Bacteria Concentrations (CFU/100mL) [Infrequent Full Contact Recreation Standard = 151 CFU/100mL] 9

10 Water Quality Monitoring Plan Summary of Results Anacostia Watershed BST Monitoring (206 samples) 80% 70% 65.5% 5% Percentage of Sam mples 60% 50% 40% 30% 20% More than 2/3 of samples have NO human bacterial sources When detected, most human bacterial sources account for less than 20% of the bacteria in those samples 10% 0% 5.8% 6.8% 7.3% 4.4% 3.4% 2.4% 3.4% 15% 1.5% 0% 1-5% 6-10% 11-15% 16-20% 21-25% 26-30% 31-35% 36% Percentage of Human Source Bacteria Detected 10

11 Water Quality Monitoring Plan Summary of Results Anacostia Watershed BST Monitoring Apparent Seasonal Difference 40% 35% 30% 25% 20% 15% 10% 5% 0% Winter Samples Summer Samples 50% 5.0% 31.4% 27.0% 15.6% 16.0% 16.7% 17.6% 14.8% 13.8% 11.8% 6.6% Percentage of Human Source Bacteria Detected 1.2% % 1.5% 2.6% 1.0% 1.4% 1.0% % 2.5% 3.8% 1.0% % Paint Branch 1 Paint Branch 2 North theast Br 1 North theast Br 2 Indian Creek 1 Indian Creek 2 Lwr Anacostia 1 Lwr Anacostia 2 Upr Beav averdam 1 Upr Beav averdam 2 Northw thwest Br 1 Northw thwest Br 2 Sligo Creek 1 Sligo Creek 2 Oxon Run n/watts Br Lwr Beav averdam 1 Lwr Beav averdam 2 Sewer Basin and Sampling Station

12 Complete Priority 1 Rehabilitation Work Identified by Inspections & Surveys in 10 Years-Sewer Repair, Replacement, Rehabilitation Plan (SR 3 Plans) Reconstruction Program approach Indefinite it Delivery and Indefinite it Quantity Contracts t Roads (Public Streets and Thoroughfares) Defects identified through sewer inspection and investigations Residential rehabilitation of mainline and manholes, primarily in roadways Laterals (Mainline to Property or ROW line) Service laterals, sewer house connections from mainline to property or Right of Way line Environmentally Sensitive Areas (ESAs) Defective assets identified through trunk walk investigations Work will be within ESAs 12

13 (Anacostia Watershed) Current Status of Rehabilitation Work Identified by Inspections & Surveys in 10 Years-Sewer Repair, Replacement, Rehabilitation Plan (SR 3 Plans) All SR3 Plans have been submitted and approved with the exception of Beaverdam Northwest Branch Basin Northwest Branch ESA 2.68 miles - currently under design Northwest t Branch Roads miles - design is completed,» Construction is expected to begin in April 12 Oxon Run Basin Oxon Run Basin ESA miles - currently under design Oxon Run Basin Roads 2.58 miles - currently under design,» Construction is expected to begin in July 12 Sligo Creek Basin Sligo Creek ESA 2.72 miles - currently under design Sligo Creek Roads miles - currently under construction 13

14 - continued (Anacostia Watershed) Current Status of Rehabilitation Work Identified by Inspections & Surveys in 10 Years-Sewer Repair, Replacement, Rehabilitation Plan (SR3 Plans) Paint Branch Basin Paint Branch ESA miles - currently under design Paint Branch Roads 2.27 miles - currently under construction Lower Anacostia Basin Lower Anacostia ESA 0.3 miles - currently under design Lower Anacostia Roads miles - currently under design,» Construction is expected to begin in April 12 Beaverdam Basin Beaverdam Basin ESA 2.46 miles - currently under design Beaverdam Basin Roads miles - currently under design Northeast Branch SSES being finalized 14

15 Rehabilitation Techniques Sewer Lining i Lining ready for installation. ti After lining is cured in place. Lining being inverted in pipe 15

16 Manhole Rehabilitation Techniques Manhole Chimney Seal Manhole Liningi 16

17 Enhance our Existing Fats, Oils and Grease (FOG) Program Issue all FOG Permits by December 30, 2010 and Complete all Inspections by June 7, Modified FOG Plan and FOG Permit approved by MDE and EPA Completed 55% baseline inspections for year one through four (Completed 8,645 baseline inspections as of February, 2012, 95% complete) Completed 100% Permits Issued Milestone (Issued 6,377 FOG permits as of January, 2012) Issued 3,549 Notice of Violations since January 1, 2000 Issued 306 Citations ranging from ($250 to $1,000) since January 1, 2000 Continuing public outreach 17

18 Environmental Projects completed in 5 Years Enhance Existing Source Water Protection Efforts by Purchasing Buffer Property Around the Patuxent River Reservoirs (not less than $3.29 Million) Three properties purchased in 2009 and 2010 (21.36 acres in Burtonsville; acres in Highland; 4.47 acres in Scaggsville) Two conservation easements purchased in 2010 (15.75 acres in Burtonsville and acres in Brookeville) Approx. $3,400,000 spent Completed in December 2010 $81,000 spent on additional improvements to purchased land in 2011, including debris removal, tree planting SEP Completion Report approved by MDE and EPA. 18

19 Pump Stations Submit Plan/Schedule for Implementation of Facility Plan for Anacostia Pump Station. Anacostia Facility Plan has been approved by MDE and EPA. All Permit approvals were received November 30, The MDE and the EPA granted a schedule extension due to delays in receiving i permit approvals. A revised schedule was approved by MDE and EPA on October 19, Construction has started and is 24% complete. Substantial completion is on-schedule for August 22,

20 Pump Stations Submit Plan/Schedule for Implementation of Facility Plan for Broad Creek Pump Station. Broad Creek Facility Plan and scheduled has been approved by MDE and EPA. One-hundred percent design submittal was received on March 31, The initial Joint Permit Application was submitted on January 19, 2011, and resubmitted on April 13, Submitted request to MDE and EPA for extension with Force Majeure provisions on November 2, 2011, for specific deadlines in the plan and schedule because of WSSC s inability to secure permit approvals. The request for an extension is pending approval from the MDE and the EPA. Waiting for environmental permit approval to start construction & schedule dependent on permit approval 20

21 WSSC Statistical Data Calendar Year SSOs SSO Volume (thousand gallons) Anacostia Watershed SSOs Anacostia Watershed SSO Volume (thousand gallons) , , , , , ,

22 Questions? 22