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Draft Final Report Acwa-08-05 - Continuation Of Lower Nushagak River Fecal Coliform And Water Quality Assessment - Alaska Department Of Environmental Conservation - 2008 Page 8

DRAFT Final Report ACWA-08-05

8 October 2008

parameters can be found in the ADEC-approved QAPP for this project. Analytica Group, an ADEC-

approved lab, was the laboratory selected to perform the analysis of the fecal coliform samples for this

project.

Data management

Field data sheets were printed on Rite in the Rain paper and used to record field measurements and

observations. Data sheets were reviewed in the field to insure completeness before moving on to the

next site. Once back in Anchorage, data and observations were entered into an Excel spreadsheet. The

project coordinator reviewed all the data to insure its accuracy. Data not meeting data quality

objectives outlined in the QAPP were flagged in the spreadsheet. Laboratory data were reviewed upon

receipt from the lab and also entered into an Excel spreadsheet for data analysis.

Data quality assurance

The Quality Assurance Project Plan (QAPP) for this project was approved by ADEC prior to any data

collection. The QAPP for this project outlines data quality assurance measures in more detail, and is

available from ENRI upon request. Both YSI 556 multi-meter and Hach 2100 turbidimeter were

calibrated prior to sampling events. All field measurements for this project were collected in at least

duplicate, with 10% DI blanks measured for turbidity. The YSI 556 multi-meter was checked periodically

during sampling to check for drift. We had problems with the pH probe on the multi-meter during the

October sampling event, after which the multi-meter was sent to TTT Environmental, Inc. for

maintenance and repairs. Ten percent of all fecal coliform samples were filled with sterile deionized

water and submitted to the lab blind. All of these samples were found to be below the detection limit in

the lab.

Results

Water quality data

Water quality data collected for this project in FY08 included field measurements of water temperature,

pH, specific conductance, and dissolved oxygen and collection and analysis of water samples for fecal

coliform bacteria. These data were collected at three major sites, each consisting of nine sampling sites,

in the lower Nushagak River. These data will contribute to the baseline data collection effort to date on

the lower Nushagak River. All data are presented in Appendix A—Water Quality Data.

Water temperature

The temperature of the water influences both the chemistry and biology in any aquatic system. Water

temperature, along with barometric pressure, determines the amount of dissolved oxygen the water

can hold in solution when at equilibrium with the atmosphere. The colder the water, the more

dissolved oxygen it can hold in solution. Water temperature also affects the metabolic and growth rates

of fish. The state of Alaska sets the upper limit for water temperature in waters that are migration

routes and rearing areas for anadromous fish at 15 degrees Celsius.

Page 8

Draft Final Report Acwa-08-05 - Continuation Of Lower Nushagak River Fecal Coliform And Water Quality Assessment - Alaska Department Of Environmental Conservation - 2008 Page 8

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