Laguna de Santa Rosa TMDL
Steve Butkus
North Coast Regional Water Quality Control Board
October 14, 2009 Overview of Presentation
Review TMDL Overview
Review 2008 Data Collection Effort
Review 2009 Data Collection Effort Pollutants/Stressors to be addressed by Laguna TMDL Sedimentation High Temperature Low Dissolved Oxygen Organic Matter Nitrogen Phosphorus What is a TMDL?
Total Maximum Daily Load Federal Clean Water Act §303(d) Amount of a pollutant that a waterbody can receive and still meet water quality objectives Water Quality Objectives have been established to protect beneficial uses TMDL Elements
California TMDL Guidance (2005)
1. Project Definition 6. Numeric Target 2. Watershed Description 7. Linkage Analysis 3. Data Analysis 8. TMDL Calculations and Allocations 4. Source Analysis 9. Public Participation 5. Critical Condition and Seasonal Variation 10. Implementation Plan 11. Monitoring Plan Geographic Scope
Includes Windsor Creek Extends to confluence with Russian River Monitoring 2008
Monitoring Objectives: ¾Assess Loading from Major Laguna Watershed Tributaries
¾Collect Dissolved Oxygen and Chlorophyll Data for Water Quality Model Calibration
¾Collect Continuous Temperature Data for Temperature Model Calibration Monitoring 2008
Monitoring Locations: ¾Mainstem Laguna Locations
Benson Road, Stony Point Road, Todd Road, Joe Rodata Trail, Sebastopol Community Center, Occidental Road, River Road, Trenton-Healdsburg Road
¾3 Santa Rosa Creek Locations
Willowside Road, Fulton Road, Yulupa Ave Monitoring 2008
Monitoring Locations: ¾Tributary Locations (near mouth)
Abramson Creek, Blucher Creek, Brush Creek Calder Creek, Colgan Creek, Cotati Creek, Gossage Creek, Hinebaugh Creek, Matanzas Creek, Mark West Creek, Peterson Creek, Piner Creek, Turner Creek, Vine Hill Creek, Washoe Creek, Wilfred Creek (Bellevue Flood Control Channel), Windsor Creek Monitoring 2008
Grab Samples ¾Constituents:
¾TSS, BOD5, NH3, NO2+NO3, Total Kjeldahl N, Ortho-P, Total-P, Total Mercury and Methyl-Mercury 9Collected in June and September 9Triplicates of each constituent to assess sampling variability Monitoring 2008
Constituent Grab Samples
ABR1 BLU1 BRU1 COL1 COP1 COT1 DSEB
D GOS1
I
_ HIN1 E MAT1
T I MWC1 S PET1 PIN1 TUR1 VIN1 WAS1 WIL1 WIN1 0.0 0.5 1.0 1.5 Ammonia (mg/L) Monitoring 2008
Instantaneous Dissolved Oxygen • Compare early morning vs. late afternoon • Calibration issues culled morning data set • Summer DO - 61% exceed WQO • Fall DO – 48% exceed WQO Continuous Temperature at 18 Locations • Exceedance of MWMT for salmonid migration • 100% of 4 Laguna Sites • 35% of 14 tributaries (near Mouth) Monitoring 2008
Stratification Measurements
Laguna at Sebastopol Pond
Temp_Surface Temp_Bottom
21
20
19
18
17 Temperature (C)
16
15 9/25/08 9/26/08 9/27/08 9/28/08 9/29/08 9/30/08 10/1/08 Date Monitoring 2008
Stratification Measurements
Laguna at Sebastopol Pond
DO_Surface DO_Bottom
14
12
10
8
6
4
Dissolved Oxygen (mg/L) 2
0 9/25/08 9/26/08 9/27/08 9/28/08 9/29/08 9/30/08 10/1/08 Date Monitoring 2008
Chlorophyll Sampling 9Grab samples & in-situ Fluorometry
LOR Pond Spatial Variability of Surface Chlorophyll-a
8/27/2008 9/2/2008 9/23/2008
1.400
1.200
1.000
0.800
0.600
0.400 Chlororphyll-a (mg/L) Chlororphyll-a 0.200
0.000
1 2 R R R 3 R 4 R 5 O O LO LO LO L L Thalweg Location Monitoring 2009
Monitoring Objectives: ¾Assess Loading from Specific Land Uses
¾Collect additional Dissolved Oxygen Data for Water Quality Model Calibration
¾Collect Additional Continuous Temperature Data for Temperature Model Calibration Monitoring 2009
Land Use Loading Estimation: ¾ Sites Randomly Selected for Sampling ¾ 18 Dry & 18 Wet weather samples per land use ¾ 7 Land Use Categories:
Cropland and pasture Orchards, Groves, Vineyards, Nurseries, and Ornamental Horticultural Areas Residential – sewered Residential – non-sewered Commercial and Services Rangeland Evergreen Forest Land Monitoring 2009
Continuous Temperature Measurement:
¾ Watershed Divided into Lithotopo Units
¾ Existing Data complied from: City of Santa Rosa, Sonoma County Water Agency, Sotoyome Resource Conservation District, Cotati Creek Critters, and Regional Water Board.
¾ 26 New Sites Selected to Fill Data Gaps Monitoring 2009
Temperature Monitoring Locations
Existing Data New Sites Monitoring 2009
Continuous Data Sonde Measurement: ¾ Sites Selected to Fill Data Gaps ¾ Data collected for QUAL2Kw Model Calibration and Validation ¾ Locations to be Monitored: Laguna near Sebastopol Community Center Laguna near Occidental Road Laguna near Confluence with Santa Rosa Creek Santa Rosa Creek near Willowside Road Santa Rosa Creek near Brookwood Ave Next Steps
¾ Develop Models for Water Quality and Temperature
¾ Assess Different Management Scenarios ¾ Allocation of Loads ¾ Implementation Planning Contact Us
Project Manager Rebecca Fitzgerald 707-576-2650 [email protected] v Staff Scientist Steve Butkus 707-576-2834 [email protected]
TMDL Unit Lead Matt St. John 707-570-3762 [email protected]