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AN UPDATE ON EFFORTS TO IMPROVE WATER QUALITY IN URBAN STREAMS IN DENVER, CO Jon Novick Denver Dept. of Environmental Health Managing Rivers in Changing Climes:, 2014 River Management Symposium
Denver’s Streams
Water Quality Concerns
Colorado’s 303(d) List
Stream Segment Use Supported
Aquatic Life Recreation Water Supply Agriculture
South Platte River 14 Yes No (E. coli) No (arsenic) Yes
Cherry Creek 3 No (Se, Fe) No (E. coli) Yes Yes
Bear Creek 2 No No (E. coli) Yes Yes
Cherry Creek Tributaries (Goldsmith Gulch)
4 No (Se) Yes Yes N/A
South Platte Tributaries (Lakewood, Weir, Sanderson, Harvard West, and Harvard Gulches and Westerly Creek)
16c No (Se) No (E. coli) Yes N/A
Source: Colorado Department of Public Health and Environment, Water Quality Control Commission, 5 CCR 1002-93 , Regulation #93, Colorado's Section 303(d) List of Impaired Waters and Monitoring and Evaluation List, Adopted March 30, 2012.
E. coli Levels at Confluence Park
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Jan-Feb Mar-Apr May-Jun July-Aug Sept-Oct Nov-Dec
Log
E. c
oli i
n C
FU /
100
mL
Confluence Park - Combined Results from Cherry Creek and the South Platte River
E. coli Standard – 126 CFU / 100 mL
South Platte E. coli TMDL
1998 – South Platte Segment 14 placed on 303(d) List as impaired by E. coli
2007 – South Platte Segment 14 E. coli TMDL Issued Wasteload allocation for Denver’s MS4 126 CFU / 100 mL in dry weather discharges
2009 – Wasteload Allocation implemented into Denver’s MS4 Permit
MS4 Permit Requirements Trash Reduction Efforts Incorporation of WQ into Capital Projects WQ Strategic Planning Education and Outreach
Ongoing Efforts to Improve WQ
MS4 Permit Requirements
Section 1.B.1.f - Special Section on E. coli Monitoring to identify outfalls of concern - “Priority
Outfalls” Implement system maintenance program Mark storm sewer inlets Education and outreach Implement other BMPs as needed Conduct annual analysis of monitoring data
10 Year Compliance Schedule
System Maintenance BMPs
Clean storm and sanitary sewers Eliminate illicit connections to the storm sewers Identify and eliminate cross connections between the
storm and sanitary sewers Repair damaged sanitary infrastructure and
disconnected taps
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Geo
met
ric
Mea
n E.
col
i in
CFU
/ 1
00 m
L
Outfall Data Priority Basin (N-433-E) Running 12 Sample Mean Goal
Storm Sewer Cleaning
2008-2009
BMP Effectiveness Evaluation
BMP Effectiveness Evaluation
Before Implementation After Implementation
Number of Samples
Median E. coli (CFU / 100 mL)
Number of Samples
Median E. coli (CFU / 100 mL) p
S-242-E 37 200 0 NA NA
S-191-W 46 240 3 230 0.8380
N-42-W 15 510 9 230 0.2828
N-201-W 15 660 38 1 0.0378
N-211-W 13 440 36 1 0.0024
N-221-W 15 3600 36 710 0.0013
N-311-W 17 6600 6 810 0.0017
N-411-E 9 1090 60 465 0.4275
N-433-E 17 2700 55 900 0.1264
N-453-E 25 140 20 1 0.0000
Trash Reduction
Done or Ongoing Trash inventories at select locations on the South Platte
River Examine Public Perceptions Education and Outreach Develop Plan
Planned More Trash Inventories Education and Outreach Plan Implementation
Trash Reduction
Capital Improvement Projects
WQ Strategic Planning
Education and Outreach
Rebranding to tie together efforts
Refine Messaging Work with non-profits
Outreach to Educators Community Based Social Marketing Campaigns
Social media
Funding
Funding
Funding for these efforts comes from a variety of sources including storm water fees, grants, and in-kind services from partners.
Conclusions
Questions?
Jon Novick Denver Dept. of Environmental Health
720/865-5468
