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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 6

DRAFT Final Report ACWA-08-05

8 October 2008

Methods

Sampling design

Fecal coliform and water quality measurements were taken at three sites on the lower Nushagak River

between Koliganek and just downstream from New Stuyahok five times during FY08: in August,

September and October 2007, and in May and June 2008. GPS Coordinates are listed in Table 1:

Table 1.

GPS Coordinates of Lower Nushagak River Sampling Locations

Sample Site

Location Description

Latitude (º)

Longitude (º)

Site 1

Below Koliganek

59.73053

-157.27261

Site 2

Below mouth of Mulchatna River

59.62221

-157.10503

Site 3

Below New Stuyahok

59.44092

-157.31445

The sampling crew consisted of the project officer, one to two local monitors, and the boat operator.

Each of the three sample sites had a total of 9 sampling locations located along three transects. The

main site transect was located based on the information in Table 1. Three samples were taken at the

main transect—two located two feet from each bank and one “main” site at the main flow of the river.

Sample sites were located on a straight reach of the river, with a uniform channel cross section. A GPS

waypoint (minimum 20 feet accuracy) was taken at the main flow/midpoint of the stream. The distance

below/above the ordinary high water (OHW) mark was estimated at the affected bank of each site.

Per site, there were also two additional sampling transects—one located upstream, above all suspected

local human caused inputs of fecal coliform, and one located about 300 meters downstream from the

main site transect. Three sites were sampled along each of these transects— two located two feet from

each bank and one “main” site at the main flow of the river (see Figure 2).

In addition to the nine fecal coliform samples collected at each of the three sites, three sterile Deionized

water “blanks” were poured into sample bottles, for a total of 30 fecal coliform samples that were sent

to the laboratory after each of the five sampling events.

Field measurements



Water temperature



Dissolved oxygen



Specific conductance



Turbidity



Barometric pressure

Laboratory samples



Fecal coliform

Page 6

Draft Final Report Acwa-08-05 - Continuation Of Lower Nushagak River Fecal Coliform And Water Quality Assessment - Alaska Department Of Environmental Conservation - 2008 Page 6

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