6 big dry creek 2011 clrma big dry creek.pdf · summary of biggy dry creek e. coli data geometric...
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Big Dry Creek Big Dry Creek Watershed Association 2011Watershed Association 2011
Presented by Presented by yyJane Clary, Wright Water Engineers, Inc.Jane Clary, Wright Water Engineers, Inc.
On Behalf of the Big Dry Creek Watershed Association On Behalf of the Big Dry Creek Watershed Association November 2011November 2011
Big Dry Creek Watershed• 110 square miles110 square miles• 42 mile length• Rocky Flats to FortRocky Flats to Fort
Lupton
Rocky Flats: 1995Rocky Flats: 1995
Rocky Flats: 2005Rocky Flats: 2005
Adams CountyAdams County
Weld County
HistoryHistory• Formed by wastewater dischargers’ group in 1997: Broomfield,
Northglenn Westminster and Rocky FlatsNorthglenn, Westminster and Rocky Flats
• Expanded to include Adams and Weld Counties
• Joint water quality monitoring program in place since 1988 for cities
• “Driver” for expanded collaboration• Driver for expanded collaboration--unionized ammonia stream standard (0.06 mg/L vs. 0.1 mg/L)
• Initial “Vehicle”--RGI grants, 319 grant, DOE grants—now cities and WCRA
• Formed 501(c)(3) in 2004• Formed 501(c)(3) in 2004
Driving Issues ChangingDriving Issues Changing• Originally a wastewater discharges group, no longer the
case now:case, now:– Phase II NPDES stormwater permitted cities/counties
discharge to Big Dry Creek– Nonpoint source issues
• Regulatory challenges becoming more complicated– Nutrient criteria– Aquatic life criteria
E li TMDL– E. coli TMDLs• Big Dry Creek hydrology is particularly complicated
– WWTP discharges & reuse programsStandley Lake Releases irrigation diversions and– Standley Lake Releases, irrigation diversions and returns
– Stormwater response to urbanization
Monitoring and Analysis:Making Sure We Have Scientifically
Defensible Information• Monitoring plan on website
www.bigdrycreek.org• 8 locations monitored monthly for water quality• 8 locations monitored monthly for water quality
and/or flow• Nutrients, metals, E. coli, other• Macroinvertebrate, fish and habitat
assessment—now biannually at 6 sites• USGS Gage ($14 500+)• USGS Gage ($14,500+)• SIM database/data sharing (CO Data Sharing
Network, Barr Milton, SPCURE, Division)
SeleniumSelenium
Big Dry Creek Instream SeleniumBig Dry Creek Instream Selenium Data Summary (2006-2010)2006-2010(per Reg.
38)
2006-2010 (w/out Oct.)
Dec. 2007
Standard
2006-2010
(per Reg. 38)
2006-2010
(w/Oct)
Dec. 2007 StdOct.) 38)
All Sites(85th %) 6.5 6.2 NA All Sites
(85th %) 8.0 7.9 NA
bdc1.5, 2.0, 4.0 (85th %)
7.9 7.37.4(ch)
bdc1.5, 2.0, 4.0 (85th %)
12.7 13.4 15 (ch)( ) ( )
bdc1.5, 2.0, 4.0 (M )
15.6 13.018.4(ac)
bdc1.5, 2.0, 4.0 (95th%)
16.6 16.019.1 (ac)(Max) (ac) (95th%) (ac)
Summary of Big Dry Creek E. coli Datay g yGeometric Mean E. coli (#/100 mL)
bdc10.0 bdc11.0Year bdc0.5 bdc1.0 bdc1.5
bdc10.0 (Broom. WWTP)
bdc2.0bdc11.0 (West. WWTP)
bdc3.0 (I-25) bdc4.0 bdc5.0 bdc6.0
2000 212 151 389 -- 574 -- 294 500 212 3232001 477 118 332 215 649 68 387 634 442 5102002 858 230 363 364 934 16 536 441 451 5722003 191 210 293 27 615 24 382 225 249 3392004 279 181 217 18 346 28 205 187 156 3772004 279 181 217 18 346 28 205 187 156 3772005 152 122 281 26 328 35 204 113 182 3012006 76 241 316 20 309 48 214 163 179 3332007 196 177 257 14 324 66 230 231 198 3642008 266 197 267 10 461 6 439 376 290 3802008 266 197 267 10 461 6 439 376 290 3802009 61 78 147 5 207 14 251 137 149 1972010 111 191 193 12 483 16 376 280 235 368
Bimonthly Summary of Instream Big Dry C k E li D (2006 2010) (#/100 L)Creek E. coli Data (2006-2010) (#/100mL)
Recreation Season
StationJan‐Feb
Mar‐Apr
May‐Jun
Jul‐Aug
Sept‐Oct
Nov‐Dec
bdc0.5 11 56 324 449 240 48bdc1.0 40 87 366 767 215 29bdc1.5 64 82 623 964 381 103bdc2 0 223 96 493 885 526 283bdc2.0 223 96 493 885 526 283bdc3.0 146 98 333 728 600 286bdc4.0 96 55 335 629 437 249b 74 52 368 641 409 171bdc5.0 74 52 368 641 409 171bdc6.0 136 169 997 584 473 146All Sites 87 81 443 688 389 136Note: Shaded values exceed the stream standard. Bold values are the highest bimonthly value per station.
Geometric Mean E. coli 2006-2010 by Month & Station
1000
1200y
800
1000
L)
bdc0.5bd 1 0
600
li (#
/100
mL bdc1.0
bdc1.5bdc2.0bdc3 0
400E. c
ol bdc3.0bdc4.0bdc5.0bdc6.0
200
0Jan-Feb Mar-Apr May-Jun Jul-Aug Sept-Oct Nov-Dec
One Illicit Discharge IdentifiedOne Illicit Discharge Identified and Corrected
Average Total Phosphorus Concentration in Broomfield WWTP Discharge
3.503.754.00
g
2 502.753.003.25
mg/L)
1.752.002.252.50
hospho
rus (m
0 751.001.251.50
Total Ph
0.000.250.500.75
2002 2003 2004 2005 2006 2007 2008 2009 2010Year
Average Total Phosphorus Concentration in Westminster WWTP Discharge
3.503.754.00
2 502.753.003.25
mg/L)
1.752.002.252.50
hospho
rus (m
0 751.001.251.50
Total Ph
0.000.250.500.75
2004 2005 2006 2007 2008 2009 2010YearOnly 5 months available for 2007
Big Dry Creek Instream Total Phosphorus at bdc6.0
1 61.7
Big Dry Creek Instream Total Phosphorus at bdc6.0 (2002-2010)
1.21.31.41.51.6
mg/
L)
Mean
Lir² = 0.65
0.80.91.01.11.2
spho
rus
(m Linear (Mean)
0.40.50.60.7
Tota
l Pho
s
0.00.10.20.3
T
Note: 11/10/11 proposed Total P value for nutrient criteria= 0.17 mg/L.
2002 2003 2004 2005 2006 2007 2008 2009 2010mg/L.
Total P Loads @ bdc6.0
Understanding the Hydrology
What are the flow sources?Upstream—Standley Lake Downstream—Wastewater
Biological MonitoringBiological Monitoring
COMPARISON OF RAPID BIOASSESSMENT PROTOCOL (RBP) HABITATASSESSMENT SCORES FOR BIG DRY CREEK SITES, 2000-2004 MEAN
VS 2006 AND 2008VS. 2006 AND 2008
COMPARISON OF INVERTEBRATE COMMUNITY INDEX (ICI) SCORESINDEX (ICI) SCORES
FOR BIG DRY CREEK SITES IN FALL,1997-2004 MEAN VS. 2006 AND 2008
Summary: Benefits of Watershed Approach
• Cost sharing for effective monitoringg g– Biological data– Water quality
Data storage and retrieval– Data storage and retrieval
• Hydrology matters– USGS gage cost-sharing– UDFD master planning critical
• Tough regulatory issues best addressed at watershed scalescale– E. coli– Nutrients– Aquatic life– Selenium
www.bigdrycreek.orgg y g
