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![Page 1: Quartermaster Harbor Nitrogen Management Study Project Overview and Preliminary Nitrogen Loading Estimates to the Harbor October 25, 2011.](https://reader035.fdocuments.us/reader035/viewer/2022062315/56649eef5503460f94bffaba/html5/thumbnails/1.jpg)
Quartermaster Harbor Nitrogen Management
Study
Project Overview and Preliminary Nitrogen
Loading Estimates to the Harbor
October 25, 2011
![Page 2: Quartermaster Harbor Nitrogen Management Study Project Overview and Preliminary Nitrogen Loading Estimates to the Harbor October 25, 2011.](https://reader035.fdocuments.us/reader035/viewer/2022062315/56649eef5503460f94bffaba/html5/thumbnails/2.jpg)
Study Team• Jill Gable – Grant Project Officer, EPA• Curtis DeGasperi – Project Manager, KC• Eric Ferguson – Surface/Groundwater
monitor, KC • Kim Stark - Marine monitoring, KC• Cheryl Greengrove – Environmental Science,
UWT• Julie Masura – Researcher, UWT• Skip Albertson – Marine Modeler, Ecology• Larry Stockton –Policy & Public Outreach, KC
![Page 3: Quartermaster Harbor Nitrogen Management Study Project Overview and Preliminary Nitrogen Loading Estimates to the Harbor October 25, 2011.](https://reader035.fdocuments.us/reader035/viewer/2022062315/56649eef5503460f94bffaba/html5/thumbnails/3.jpg)
Quartermaster Harbor Nitrogen Management Study
• Problem: Low dissolved oxygen levels observed in harbor
• Low oxygen can be harmful to fish and other aquatic life like in South Puget Sound embayments
Quartermaster Harbor
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QUARTERMASTER HARBOR
Jan-2006 Jan-2007 Jan-2008 Jan-2009 Jan-2010 Jan-2011
DIS
SO
LV
ED
OX
YG
EN
(M
G L
-1)
0
2
4
6
8
10
12
14
16
18
20MSWH01 NSAJ02 Extraordinary Quality Standard 7 mg L-1
Marine MonitoringMSWH01
NSAJ02
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< 1 mg/L
Yacht Club Mooring September 2008
http://green.kingcounty.gov/marine-buoy/
15-minute data - September 20 – 22, 2008
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Quartermaster Harbor Nitrogen Management Study
Goal: Determine how human activities (along with natural factors) affect low dissolved oxygen levels in Quartermaster Harbor
www.kingcounty.gov/QMHnitrogenstudy
![Page 7: Quartermaster Harbor Nitrogen Management Study Project Overview and Preliminary Nitrogen Loading Estimates to the Harbor October 25, 2011.](https://reader035.fdocuments.us/reader035/viewer/2022062315/56649eef5503460f94bffaba/html5/thumbnails/7.jpg)
Sources of Nitrogen on VMI
• Atmosphere• Septics• Livestock• Fertilizer• Alder• Boats
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Sources of Nitrogen to Quartermaster Harbor
Harbor
Atmosphere
Marine Boundary
Streams
Groundwater
Sediment
Nearshore Septics
Boats
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JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Nitr
ate+
Nitr
ite-N
(m
g/L)
0
2
4
6
8
10
Streams Sampling Locations
Judd Creek
Mileta Creek
Fisher Creek
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Marine Monitoring Stations
King County UWT
Mooring
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Septic SystemLocations
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Nitrate in Shallow Groundwater
Median (mg NO3-N/L)
0.1 - 0.55
0.55 - 1.1
1.1 - 2.3
2.3 - 3.93
3.93 - 6.5
CARA CODE
1
2
3
Shallow Deep
Nitr
ate
Nitr
og
en
(m
g/L
)
0
2
4
6
8
![Page 13: Quartermaster Harbor Nitrogen Management Study Project Overview and Preliminary Nitrogen Loading Estimates to the Harbor October 25, 2011.](https://reader035.fdocuments.us/reader035/viewer/2022062315/56649eef5503460f94bffaba/html5/thumbnails/13.jpg)
• Marine boundary• Boats
External N inputs not assessed
Nearshore Septic
Systems25%
Submarine Groundwater
10%Surface Streams
59%
Atmospheric Flux6%
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July – October Estimates
Nearshore Septic
Systems50%
Submarine Groundwater
20%
Surface Streams
23%
Atmospheric Flux7%
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kg N
pe
r da
y
0
10
20
30
40
50
60
70
Uncertainty in Nitrogen Loading
Estimates
NearshoreSeptics
AtmosphericDeposition
Groundwater
Streams
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Benthic Flux StudySeptember 1-2, 2010
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0
50
100
150
200
250
300
350
400
450
500
Nearshore Septic
Systems
Submarine Groundwater
Surface Streams
Atmospheric Flux
Benthic Flux
KG N
PER
DAY
Nitrogen Loading Estimates
Seasonal Load (late summer)?
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Generalized Environmental Modeling System for Surfacewaters (GEMSS®)
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“Wicked” Problem
• No silver bullet• Multiple nitrogen
sources• Puget Sound wide
perspective forthcoming