| Study ID | CCOF0003 |
| Study Name | Lower Okanogan River Basin DDT and PCB TMDL Effectiveness Monitoring, 2008 |
| EIM Data Entry Review Status | Reviewed |
| Study Type | Total Maximum Daily Load (TMDL) effectiveness monitoring |
| Study Purpose | This study monitors the effectiveness of the Lower Okanogan River Total Maximum Daily Load
(TMDL) for the legacy contaminants DDT and PCB. The study compares contaminant
concentrations in composite fish tissue samples collected in 2001 against a similar data set
collected in 2008. Three species were sampled: smallmouth bass (Micropterus dolomieui),
mountain whitefish (Prosopium williamsoni) and common carp (Cyprinus carpio). Samples
were collected from three reaches of the Okanogan River along a span of 79 river miles. |
| Field Collection Date Range | 8/6/2008 - 9/22/2008 |
| Data First/Last Loaded Date |  |
| Data Last Updated Date | |
| Ecology Program or Other Responsible Entity | Ecy Environmental Assessment Program |
| Ecology Contact | Chris Coffin |
| Ecology Monitoring Program | |
| Submitting Organization | |
| Study QA Planning Level | LEVEL 4: Approved QAPP or SAP. |
| Study QA Project Plan Description | |
| Study QA Assessment Level | Level 5: Data Verified and Assessed for Usability in a Peer-Reviewed Study Report |
| Study Result Description | The number of samples not meeting (exceeding) National Toxics Rule criteria is similar between
the 2001 and 2008 studies. No carp specimens were obtained from the lower reach in 2001 due
to unavailability. However, large specimens of carp collected from this reach in 2008 had
elevated concentrations of total DDT. A fish consumption advisory for carp is likely to be issued
by the Washington State Department of Health based, in part, on these 2008 samples.
Comparability between the two studies was difficult due to small sample size. No significant
changes were found in median total DDT concentrations between the two studies. A decrease in
lipid-normalized median total PCB concentration was found for common carp, significant at the
90% level. No other significant changes were found in median total PCB concentrations.
Mountain whitefish from the lower reach show slightly lower levels of contamination than in the
other two reaches. Otherwise, overall contamination in fish is similar among the three reaches. |
| Study Comment | At the end of sample processing, selected samples in the current study were split with the
WSTMP. These samples were analyzed for lipids, PCB congeners, mercury, polybrominated
diphenyl ethers (PBDEs), and dioxins and furans (PCDD/Fs; polychlorinated dibenzo-p-dioxins
and polychlorinated dibenzofurans.)
This split took place at the end of the processing routine: aliquots of the fully homogenized
sample were put into different jars for different analyses. Some jars were loaded for the
effectiveness monitoring project and assigned a unique sample number. Other jars were loaded
for the WSTMP project and assigned a different sample number.
Results from these splits are discussed as part of the WSTMP 2008 report (Seiders and
Deligeannis, 2009) but the data is contained in this EIM study. |
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