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Joanne HildFriends of Deer CreekNevada City, California
Improving Watershed Health using Citizen Monitoring,
Bioassessment and Water Quality Data in Collaboration with State, County and Local Governments
Friends of Deer Creek and the State of California Cooperative work
2003: State Water Resources Control Board 303(d) impaired water body listing of lower Deer Creek for pH
2000 until present: Collaboratively wrote and adhere to Quality Assurance Project Plan with State Water Resources Control Board. Includes quarterly Technical Advisory Committee and biannual Intercallibration sessions.
2000 until present: Developed benthic macroinvertebrate bioassessment and analysis with Jim Harrington, State Department of Fish and Game.
2005-2006: Regional Water Quality Control Board trained and gave FODC 100 samples for total mercury in soil and water during storm events.
2005: State and FODC jointly held a Mercury Conference in Nevada City
Deer Creek and Squirrel Creek Nutrients and Algae
0.00
0.50
1.00
1.50
2.00
2.50
3.00
3.50
2 4 8 9 16
Site
mg/
liter
0.00
100.00
200.00
300.00
400.00
500.00
600.00
700.00
800.00
900.00
gram
s pe
r squ
are
met
er
Mean Nitrates Mean Phosphates Mean Algae Dry Mass
2005
SITE
10987654321
Me
an
pH
10
8
6
4
Mean pH2000-2006
pH/Temperature Daily fluctuations Site #10
6
7
8
9
10
11
Date/Time
pH
0
5
10
15
20
25
30
Te
mp
- D
eg
ree
s C
pH Temperature
Site ID
10.09.08.06.04.02.62.42.22.01.0
Nu
mb
er
of In
tole
ran
t F
am
ilie
s50
40
30
20
10
0
Number of Intolerant Families2000 - 2004
Mean
Deer Creek 18502004
USGS Bear-Yuba Hg sampling led to 303(d) listing
May et al, 1999
Mercury Survey Objectives:
Partnership with California Regional Quality Control Board
Determine the extent and magnitude of mercury contaminationIdentify major mercury source locations for the purposes of remediation Characterize mercury transport/streamflow relationships in order to estimate mercury loads
Partnerships with BLM and USGS:sample macroinvertebrates to determine the amount of methyl mercury getting into the food chain.
Partnership with Regional Board:100 water and sediment samples during storms.
Total Mercury in Water, Deer Creek
0.00200.00400.00600.00800.00
1000.001200.00
Sites, moving downstream. Note: reservoirs above DCL1 and below DCL6
Hg
Con
cent
ratio
n (n
g/L)
at
diffe
rent
flow
s 9.15.05
12.1.05
12.28.05
12.31.05
2.2.06
2.27.06
Preliminary Mercury Results, 2006
Deer Creek Total Hg Levels, New Years Flood '06
0.00
200.00
400.00
600.00
800.00
1000.00
1200.00
1 2 3 4 5 6 7 8
Site (3, 4, and 7 are tributaries, reservoir above 1, below 6)
Hg
Co
nce
ntr
atio
n (
ng
/L)
Mercury Concentrations at different flows for a single site, Deer Creek Watershed
0
2040
60
80100
120
0 500 1000 1500 2000 2500 3000 3500
Flow (cfs)
Tota
l Hg
(ng/
L)
Current and future projects involving State, County, Local Governments
Installation of storm drains within Nevada City
Development of erosion Best Management Practices with Nevada City, Grass Valley, Nevada County
Restoration project in Nevada City park
Development of riparian interpretive trail on Nevada City and BLM property
Bacteria study in conjunction with Nevada County Environmental Health
Stressor Identification study using macroinvertebrates with State Fish and Game
Working with county to convert wastewater disinfection from chlorination to UV
Writing a macroinvertebrate identification manual for groups in the State.
Expansion of FODC Analytical Lab
Work with members ofYuba-Bear WatershedCouncil
Collaboration with State on arsenic and heavy metal studies.
