Scientific Investigations Report 2006-5073

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006-5073

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Table 1. Field measurements and concentrations of major ions, nutrients, organic carbon, suspended sediment, and nitrogen isotope of nitrate (δ15N) collected at Union River sampling sites during summer base-flow conditions, southern part of Hood Canal, Mason and Kitsap Counties, Washington, June 2004.

[Locations of sampling sites are shown in figure 1. Abbreviations: USGS, U.S. Geological Survey; CaCO3; calcium carbonate; HCO3, bicarbonate; N, nitrogen; P, phosphorus; δ15N, isotope fractionation of N (see equation 1 in text). ft3/s, cubic foot per second; mg/L, milligram per liter; µS/cm, microsiemen per centimeter at 25°C; °C, degrees Celsius; µg/L, microgram per liter; e, estimated value; <, less than]

Map No. USGS site No. Sample
date		 Distance from
mouth of the
Union River
(miles)		 Discharge,
instantaneous
(ft3/s)		 Dissolved
oxygen
(mg/L)		 pH
(standard
units)		 Specific
conductance
(µS/cm)		 Water
temperature
(°C) 		Calcium
(mg/L)		 Magnesium
(mg/L)
U1 12063520 06-28-04 0.74 33.6 10.0 7.7 109 13.2 11.0 4.70
U2 12063518 06-28-04 .96 34.2 9.8 7.7 108 13.6 10.8 4.68
U3 12063400 06-30-04 2.6 15.1 9.6 8.0 111 18.6 11.1 4.78
U4 12063300 06-30-04 4.4 11 9.0 7.8 103 14.1 10.9 4.44
U5 12063200 06-29-04 5.9 3.4 10.0 7.3 88 15.0 9.62 3.19
U6 12063100 06-29-04 6.6 2.0 10.3 7.4 73 15.4 8.79 2.27
U7 12063000 06-29-04 7.3 15.9 10.6 7.5 66 10.1 7.80 2.18
Map No. USGS site No. Sample
date		 Potassium
(mg/L)		 Sodium
(mg/L)		 Alkalinity
(mg/L as
CaCO3)		 Bicarbonate
(mg/L as
HCO3)		 Bromide
(mg/L)		 Chloride
(mg/L)		 Fluoride
(mg/L)		 Silica
(mg/L)
U1 12063520 06-28-04 0.38 3.91 50 62 <0.02 1.92 <0.2 22.0
U2 12063518 06-28-04 .31 3.87 50 62 <.03 1.90 <.2 22.1
U3 12063400 06-30-04 .24 3.92 50 61 <.02 2.22 <.2 21.3
U4 12063300 06-30-04 .23 3.80 49 60 <.02 2.14 <.2 20.5
U5 12063200 06-29-04 .23 3.00 38 46 <.02 1.69 <.2 16.3
U6 12063100 06-29-04 <.16 2.35 30 37 <.03 1.56 <.2 11.5
U7 12063000 06-29-04 e.11 2.23 26 32 <.02 1.43 <.2 10.8
Map No. USGS site No. Sample
date		 Sulfate
(mg/L)		 Dissolved
solids
(mg/L)		 Ammonia
(mg/L as N)		 Nitrate plus
nitrite
(mg/L as N)		 Particulate-N
(mg/L)		 Orthophosphate
(mg/L as P)		 Total
nitrogen
(mg/L)		 Total
carbon,
particulate
(mg/L)
U1 12063520 06-28-04 1.7 86 <0.04 0.20 0.03 e0.01 0.27 0.3
U2 12063518 06-28-04 1.8 81 <.04 .21 .03 e.01 .26 .4
U3 12063400 06-30-04 2.1 81 <.04 .19 .03 <.02 .29 .4
U4 12063300 06-30-04 1.9 87 <.04 .17 <.02 <.02 .27 .3
U5 12063200 06-29-04 3.0 64 <.04 .23 <.02 <.02 .27 .1
U6 12063100 06-29-04 3.4 51 <.04 .12 .03 <.02 .17 .2
U7 12063000 06-29-04 3.6 51 <.04 .28 <.02 <.02 .36 .1
Map No. USGS site No. Sample
date		 Inorganic
carbon,
particulate
(mg/L)		 Organic
carbon,
particulate
(mg/L)		 Organic
carbon,
dissolved
(mg/L)		 Iron
(µg/L)		 Manganese
(µg/L)		 Suspended
sediment
(mg/L)		 δ15N
(per mil)
U1 12063520 06-28-04 <0.1 0.3 1.3 45 6.3 3 14.76
U2 12063518 06-28-04 <.1 .4 1.1 69 5.5 4 4.20
U3 12063400 06-30-04 <.1 .4 1.6 103 10.4 6 3.92
U4 12063300 06-30-04 <.1 .3 1.9 125 21.7 2 12.95
U5 12063200 06-29-04 <.1 .1 .8 13 2.7 1 1.93
U6 12063100 06-29-04 <.1 .2 1.1 19 4.6 1 1.32
U7 12063000 06-29-04 <.1 .1 1.4 8 3.1 2 17.81

1Data values are highly uncertain.

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