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Scientific Investigations Report 2009–5030

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2009–5030

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Table 1. Excess nitrogen gas (N2) measured in the DR2 catchment, Yakima River basin, Washington.

[Site locations are shown in figure 1. Suffix p indicates the shallowest well at each site; q, r, and s indicate increasingly deeper wells, respectively]

Site
identification
No.		 Concentration
(milligrams per liter)		 Number
of
samples
Average Minimum Maximum
Ground water
W20p 0.00 0.00 0.00 4
W20q 2.93 2.84 3.00 4
W21p 0.24 0.00 0.50 4
W21q 0.00 0.00 0.00 4
W21r 0.43 0.00 0.87 4
W21s 0.18 0.00 0.38 4
W23p 0.86 0.13 1.60 4
W23q 2.03 0.90 3.10 4
W24p 0.29 0.22 0.36 2
W24q 0.02 0.00 0.04 2
W25p 0.35 0.25 0.45 2
W25q 0.88 0.86 0.89 2
W30p 0.69 0.42 0.94 4
W31p 2.14 1.96 2.32 4
W31q 0.00 0.00 0.00 4
W32p 1.57 1.50 1.64 2
W32q 0.00 0.00 0.00 4
Upstream streambed transect
W61b 1.79 1.78 1.80 2
W61c 2.84 2.80 2.88 2
W62b 2.13 2.11 2.14 2
W62c 3.19 3.18 3.20 2
W63a 2.89 2.80 2.98 2
W63c 2.93 2.89 2.97 2
W64a 2.73 2.64 2.81 2
W64c 3.25 3.17 3.34 2
Downstream streambed transect
W51a 0.7 0.64 0.79 2
W51c 1.7 1.61 1.79 2
W52b 0.9 0.92 0.92 1
W53b 1.4 1.31 1.47 2
W54a 6.5 6.25 6.76 4
W55b 1.0 0.90 1.02 2

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