- Ammonia (NH3 as N), FIL, COL -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00608, MCode: CL035
Dates: 10/04/91 through 09/30/94
Open Data Set

Mean = 1.24 % Relative Standard Deviation = 4.2 Number of Observations = 76 Blind Sample ID = N41 Mean = 0.05 % Relative Standard Deviation = 20.0 Number of Observations = 67 Blind Sample ID = N40 Mean = 0.93 % Relative Standard Deviation = 2.2 Number of Observations = 72 Blind Sample ID = N39 Mean = 0.09 % Relative Standard Deviation = 10.1 Number of Observations = 71 Blind Sample ID = N38 Mean = 0.90 % Relative Standard Deviation = 2.0 Number of Observations = 93 Blind Sample ID = N37 Mean = 0.13 % Relative Standard Deviation = 7.8 Number of Observations = 83 Blind Sample ID = N36 Mean = 0.91 % Relative Standard Deviation = 3.2 Number of Observations = 132 Blind Sample ID = N35 Mean = 0.20 % Relative Standard Deviation = 5.9 Number of Observations = 122 Blind Sample ID = N34 Mean = 1.33 % Relative Standard Deviation = 3.5 Number of Observations = 50 Blind Sample ID = N33 Mean = 0.05 % Relative Standard Deviation = 26.5 Number of Observations = 47 Blind Sample ID = N32 Mean = 0.58 % Relative Standard Deviation = 3.9 Number of Observations = 7 Blind Sample ID = N31 Mean = 0.22 % Relative Standard Deviation = 17.0 Number of Observations = 10 Blind Sample ID = N30
The SGPlot Procedure


- Ammonia (NH3 as N), FIL, COL -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00608, MCode: CL037
Dates: 10/11/94 through 06/13/06
Open Data Set

Mean = 0.58 % Relative Standard Deviation = 3.5 Number of Observations = 43 Blind Sample ID = NS8 Mean = 0.19 % Relative Standard Deviation = 2.8 Number of Observations = 4 Blind Sample ID = NS7 Mean = 0.25 % Relative Standard Deviation = 4.4 Number of Observations = 41 Blind Sample ID = NS6 Mean = 0.08 % Relative Standard Deviation = 11.6 Number of Observations = 8 Blind Sample ID = NS5 Mean = 1.27 % Relative Standard Deviation = 2.3 Number of Observations = 95 Blind Sample ID = NS4 Mean = 1.27 % Relative Standard Deviation = 4.2 Number of Observations = 190 Blind Sample ID = NS2 Mean = 1.39 % Relative Standard Deviation = 1.9 Number of Observations = 7 Blind Sample ID = NS16 Mean = 0.41 % Relative Standard Deviation = 3.4 Number of Observations = 45 Blind Sample ID = NS14 Mean = 0.75 % Relative Standard Deviation = 2.7 Number of Observations = 55 Blind Sample ID = NS12 Mean = 0.95 % Relative Standard Deviation = 3.3 Number of Observations = 57 Blind Sample ID = NS10 Mean = 0.27 % Relative Standard Deviation = 8.1 Number of Observations = 45 Blind Sample ID = NAB Mean = 0.42 % Relative Standard Deviation = 1.7 Number of Observations = 8 Blind Sample ID = N90 Mean = 0.26 % Relative Standard Deviation = 7.5 Number of Observations = 8 Blind Sample ID = N89 Mean = 1.19 % Relative Standard Deviation = 4.2 Number of Observations = 16 Blind Sample ID = N88 Mean = 0.26 % Relative Standard Deviation = 2.8 Number of Observations = 24 Blind Sample ID = N87 Mean = 0.15 % Relative Standard Deviation = 2.3 Number of Observations = 23 Blind Sample ID = N85 Mean = 1.00 % Relative Standard Deviation = 1.3 Number of Observations = 23 Blind Sample ID = N84 Mean = 0.21 % Relative Standard Deviation = 5.0 Number of Observations = 20 Blind Sample ID = N83 Mean = 0.79 % Relative Standard Deviation = 2.9 Number of Observations = 24 Blind Sample ID = N82 Mean = 0.17 % Relative Standard Deviation = 5.1 Number of Observations = 24 Blind Sample ID = N81 Mean = 0.67 % Relative Standard Deviation = 2.4 Number of Observations = 21 Blind Sample ID = N80 Mean = 0.11 % Relative Standard Deviation = 15.5 Number of Observations = 4 Blind Sample ID = N79c Mean = 0.09 % Relative Standard Deviation = 12.3 Number of Observations = 19 Blind Sample ID = N79 Mean = 0.75 % Relative Standard Deviation = 4.1 Number of Observations = 48 Blind Sample ID = N78 Mean = 0.07 % Relative Standard Deviation = 10.7 Number of Observations = 46 Blind Sample ID = N77 Mean = 0.91 % Relative Standard Deviation = 1.8 Number of Observations = 42 Blind Sample ID = N76 Mean = 0.08 % Relative Standard Deviation = 9.7 Number of Observations = 32 Blind Sample ID = N75 Mean = 0.74 % Relative Standard Deviation = 3.0 Number of Observations = 48 Blind Sample ID = N74 Mean = 0.12 % Relative Standard Deviation = 11.2 Number of Observations = 48 Blind Sample ID = N73 Mean = 0.74 % Relative Standard Deviation = 3.3 Number of Observations = 47 Blind Sample ID = N72 Mean = 0.05 % Relative Standard Deviation = 22.2 Number of Observations = 48 Blind Sample ID = N71 Mean = 0.60 % Relative Standard Deviation = 3.7 Number of Observations = 24 Blind Sample ID = N70 Mean = 0.08 % Relative Standard Deviation = 15.8 Number of Observations = 34 Blind Sample ID = N69 Mean = 0.49 % Relative Standard Deviation = 3.1 Number of Observations = 36 Blind Sample ID = N68 Mean = 0.43 % Relative Standard Deviation = 2.2 Number of Observations = 36 Blind Sample ID = N67 Mean = 0.78 % Relative Standard Deviation = 1.9 Number of Observations = 59 Blind Sample ID = N66 Mean = 0.12 % Relative Standard Deviation = 18.6 Number of Observations = 60 Blind Sample ID = N65 Mean = 1.41 % Relative Standard Deviation = 3.1 Number of Observations = 60 Blind Sample ID = N64 Mean = 0.15 % Relative Standard Deviation = 4.6 Number of Observations = 58 Blind Sample ID = N63 Mean = 1.02 % Relative Standard Deviation = 4.5 Number of Observations = 60 Blind Sample ID = N62 Mean = 0.03 % Relative Standard Deviation = 17.7 Number of Observations = 37 Blind Sample ID = N61 Mean = 0.60 % Relative Standard Deviation = 3.4 Number of Observations = 60 Blind Sample ID = N60 Mean = 0.32 % Relative Standard Deviation = 4.4 Number of Observations = 60 Blind Sample ID = N59 Mean = 0.67 % Relative Standard Deviation = 5.6 Number of Observations = 59 Blind Sample ID = N58 Mean = 0.23 % Relative Standard Deviation = 13.3 Number of Observations = 59 Blind Sample ID = N57 Mean = 0.50 % Relative Standard Deviation = 9.1 Number of Observations = 57 Blind Sample ID = N56 Mean = 0.23 % Relative Standard Deviation = 14.7 Number of Observations = 52 Blind Sample ID = N55 Mean = 0.15 % Relative Standard Deviation = 7.1 Number of Observations = 45 Blind Sample ID = N49 Mean = 0.74 % Relative Standard Deviation = 4.4 Number of Observations = 56 Blind Sample ID = N48 Mean = 0.20 % Relative Standard Deviation = 9.5 Number of Observations = 58 Blind Sample ID = N47 Mean = 1.05 % Relative Standard Deviation = 5.0 Number of Observations = 77 Blind Sample ID = N46 Mean = 0.08 % Relative Standard Deviation = 16.9 Number of Observations = 62 Blind Sample ID = N45 Mean = 0.91 % Relative Standard Deviation = 2.6 Number of Observations = 74 Blind Sample ID = N44 Mean = 0.10 % Relative Standard Deviation = 11.2 Number of Observations = 80 Blind Sample ID = N43 Mean = 1.09 % Relative Standard Deviation = 2.9 Number of Observations = 10 Blind Sample ID = N42
The SGPlot Procedure


- Ammonia (NH3 as N), FIL, COL, LL -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00608, MCode: CL038
Dates: 10/08/91 through 09/28/94
Open Data Set

Mean = 0.03 % Relative Standard Deviation = 22.1 Number of Observations = 36 Blind Sample ID = N40 Mean = 0.08 % Relative Standard Deviation = 12.8 Number of Observations = 33 Blind Sample ID = N38 Mean = 0.13 % Relative Standard Deviation = 7.5 Number of Observations = 24 Blind Sample ID = N36 Mean = 0.21 % Relative Standard Deviation = 5.8 Number of Observations = 30 Blind Sample ID = N34 Mean = 0.06 % Relative Standard Deviation = 31.2 Number of Observations = 16 Blind Sample ID = N32 Mean = 0.25 % Relative Standard Deviation = 11.4 Number of Observations = 4 Blind Sample ID = N30
The SGPlot Procedure


- Ammonia (NH3 as N), FIL, COL, LL -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00608, MCode: CL039
Dates: 11/03/94 through 06/02/06
Open Data Set

Mean = 0.28 % Relative Standard Deviation = 5.6 Number of Observations = 11 Blind Sample ID = NAB Mean = 0.04 % Relative Standard Deviation = 6.0 Number of Observations = 12 Blind Sample ID = N90X Mean = 0.28 % Relative Standard Deviation = 1.6 Number of Observations = 12 Blind Sample ID = N89 Mean = 0.12 % Relative Standard Deviation = 2.5 Number of Observations = 24 Blind Sample ID = N88X Mean = 0.26 % Relative Standard Deviation = 6.9 Number of Observations = 36 Blind Sample ID = N87 Mean = 0.15 % Relative Standard Deviation = 5.6 Number of Observations = 46 Blind Sample ID = N85 Mean = 0.10 % Relative Standard Deviation = 2.0 Number of Observations = 21 Blind Sample ID = N84X Mean = 0.22 % Relative Standard Deviation = 3.1 Number of Observations = 40 Blind Sample ID = N83 Mean = 0.08 % Relative Standard Deviation = 2.7 Number of Observations = 24 Blind Sample ID = N82X Mean = 0.18 % Relative Standard Deviation = 6.3 Number of Observations = 47 Blind Sample ID = N81 Mean = 0.06 % Relative Standard Deviation = 3.5 Number of Observations = 18 Blind Sample ID = N80X Mean = 0.61 % Relative Standard Deviation = 3.4 Number of Observations = 4 Blind Sample ID = N80 Mean = 0.12 % Relative Standard Deviation = 1.6 Number of Observations = 8 Blind Sample ID = N79c Mean = 0.10 % Relative Standard Deviation = 2.9 Number of Observations = 36 Blind Sample ID = N79 Mean = 0.07 % Relative Standard Deviation = 4.7 Number of Observations = 60 Blind Sample ID = N77 Mean = 0.85 % Relative Standard Deviation = 2.7 Number of Observations = 9 Blind Sample ID = N76 Mean = 0.08 % Relative Standard Deviation = 4.4 Number of Observations = 40 Blind Sample ID = N75 Mean = 0.12 % Relative Standard Deviation = 2.3 Number of Observations = 59 Blind Sample ID = N73 Mean = 0.06 % Relative Standard Deviation = 10.8 Number of Observations = 31 Blind Sample ID = N71 Mean = 0.08 % Relative Standard Deviation = 15.3 Number of Observations = 24 Blind Sample ID = N69 Mean = 0.42 % Relative Standard Deviation = 13.6 Number of Observations = 27 Blind Sample ID = N67 Mean = 0.12 % Relative Standard Deviation = 7.7 Number of Observations = 29 Blind Sample ID = N65 Mean = 0.15 % Relative Standard Deviation = 4.5 Number of Observations = 35 Blind Sample ID = N63 Mean = 0.04 % Relative Standard Deviation = 37.3 Number of Observations = 21 Blind Sample ID = N61 Mean = 0.34 % Relative Standard Deviation = 6.9 Number of Observations = 41 Blind Sample ID = N59 Mean = 0.20 % Relative Standard Deviation = 4.8 Number of Observations = 35 Blind Sample ID = N57 Mean = 0.23 % Relative Standard Deviation = 2.9 Number of Observations = 30 Blind Sample ID = N55 Mean = 0.14 % Relative Standard Deviation = 14.8 Number of Observations = 12 Blind Sample ID = N49 Mean = 0.19 % Relative Standard Deviation = 17.9 Number of Observations = 5 Blind Sample ID = N47 Mean = 1.06 % Relative Standard Deviation = 6.2 Number of Observations = 14 Blind Sample ID = N46 Mean = 0.07 % Relative Standard Deviation = 21.2 Number of Observations = 4 Blind Sample ID = N45 Mean = 0.10 % Relative Standard Deviation = 19.9 Number of Observations = 63 Blind Sample ID = N43
The SGPlot Procedure


- Ammonia (NH3 as N), FIL, DA -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00608, MCode: SHC02
Dates: 06/13/06 through 09/26/06
Open Data Set

Mean = 1.39 % Relative Standard Deviation = 2.7 Number of Observations = 14 Blind Sample ID = NS16 Mean = 0.04 % Relative Standard Deviation = 10.0 Number of Observations = 19 Blind Sample ID = N90X Mean = 0.44 % Relative Standard Deviation = 2.6 Number of Observations = 13 Blind Sample ID = N90 Mean = 0.27 % Relative Standard Deviation = 2.4 Number of Observations = 35 Blind Sample ID = N89
The SGPlot Procedure


- Ammonia (NH3 as N), FIL, EPA -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00608, MCode: CL036
Dates: 03/04/96 through 10/02/02
Open Data Set

Mean = 0.75 % Relative Standard Deviation = 6.6 Number of Observations = 3 Blind Sample ID = N74 Mean = 0.13 % Relative Standard Deviation = 2.5 Number of Observations = 3 Blind Sample ID = N73 Mean = 0.76 % Relative Standard Deviation = 5.2 Number of Observations = 3 Blind Sample ID = N72 Mean = 0.06 % Relative Standard Deviation = 27.2 Number of Observations = 3 Blind Sample ID = N71 Mean = 0.60 % Relative Standard Deviation = 3.6 Number of Observations = 3 Blind Sample ID = N70 Mean = 0.52 % Relative Standard Deviation = 2.7 Number of Observations = 3 Blind Sample ID = N68 Mean = 0.45 % Relative Standard Deviation = 2.9 Number of Observations = 3 Blind Sample ID = N67 Mean = 0.79 % Relative Standard Deviation = 3.5 Number of Observations = 3 Blind Sample ID = N66 Mean = 1.35 % Relative Standard Deviation = 2.6 Number of Observations = 3 Blind Sample ID = N64 Mean = 0.14 % Relative Standard Deviation = 16.4 Number of Observations = 3 Blind Sample ID = N63 Mean = 0.95 % Relative Standard Deviation = 1.8 Number of Observations = 6 Blind Sample ID = N62 Mean = 0.52 % Relative Standard Deviation = 8.5 Number of Observations = 6 Blind Sample ID = N60 Mean = 0.30 % Relative Standard Deviation = 8.5 Number of Observations = 6 Blind Sample ID = N59 Mean = 0.59 % Relative Standard Deviation = 4.9 Number of Observations = 5 Blind Sample ID = N58 Mean = 0.19 % Relative Standard Deviation = 8.7 Number of Observations = 3 Blind Sample ID = N57 Mean = 0.49 % Relative Standard Deviation = 7.5 Number of Observations = 6 Blind Sample ID = N56 Mean = 0.20 % Relative Standard Deviation = 6.5 Number of Observations = 3 Blind Sample ID = N55 Mean = 0.70 % Relative Standard Deviation = 5.1 Number of Observations = 5 Blind Sample ID = N48
The SGPlot Procedure


- Ammonia (NH3 as N), UNF -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00610, MCode: CL070
Dates: 10/08/91 through 10/15/92
Open Data Set

Mean = 0.19 % Relative Standard Deviation = 11.0 Number of Observations = 11 Blind Sample ID = N34 Mean = 0.05 % Relative Standard Deviation = 43.1 Number of Observations = 9 Blind Sample ID = N32
The SGPlot Procedure


- Ammonia (NH3 as N), UNF -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00610, MCode: CL075
Dates: 10/04/91 through 09/25/92
Open Data Set

Mean = 0.88 % Relative Standard Deviation = 1.9 Number of Observations = 35 Blind Sample ID = N35 Mean = 0.20 % Relative Standard Deviation = 7.5 Number of Observations = 39 Blind Sample ID = N34 Mean = 1.32 % Relative Standard Deviation = 3.6 Number of Observations = 44 Blind Sample ID = N33 Mean = 0.06 % Relative Standard Deviation = 29.4 Number of Observations = 50 Blind Sample ID = N32 Mean = 0.58 % Relative Standard Deviation = 3.0 Number of Observations = 9 Blind Sample ID = N31 Mean = 0.21 % Relative Standard Deviation = 4.5 Number of Observations = 7 Blind Sample ID = N30 Mean = 0.04 % Relative Standard Deviation = 66.1 Number of Observations = 6 Blind Sample ID = 50115-50103
The SGPlot Procedure


- Ammonia (NH3 as N), UNF, CFA, Acidified -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00610, MCode: CL017
Dates: 10/08/04 through 09/27/06
Open Data Set

Mean = 0.45 % Relative Standard Deviation = 1.7 Number of Observations = 11 Blind Sample ID = N90 Mean = 0.27 % Relative Standard Deviation = 8.7 Number of Observations = 12 Blind Sample ID = N89 Mean = 1.23 % Relative Standard Deviation = 1.3 Number of Observations = 8 Blind Sample ID = N88 Mean = 0.27 % Relative Standard Deviation = 2.0 Number of Observations = 12 Blind Sample ID = N87 Mean = 0.16 % Relative Standard Deviation = 3.4 Number of Observations = 8 Blind Sample ID = N85 Mean = 1.01 % Relative Standard Deviation = 1.3 Number of Observations = 9 Blind Sample ID = N84 Mean = 0.23 % Relative Standard Deviation = 1.3 Number of Observations = 7 Blind Sample ID = N83
The SGPlot Procedure


- Ammonia+Organic-N, FIL, ASF -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00623, MCode: CL061
Dates: 10/04/91 through 09/30/94
Open Data Set

Mean = 1.69 % Relative Standard Deviation = 7.3 Number of Observations = 76 Blind Sample ID = N41 Mean = 0.20 % Relative Standard Deviation = 0.0 Number of Observations = 68 Blind Sample ID = N40 Mean = 1.01 % Relative Standard Deviation = 11.1 Number of Observations = 73 Blind Sample ID = N39 Mean = 0.20 % Relative Standard Deviation = 12.9 Number of Observations = 71 Blind Sample ID = N38 Mean = 1.05 % Relative Standard Deviation = 10.6 Number of Observations = 74 Blind Sample ID = N37 Mean = 0.22 % Relative Standard Deviation = 37.2 Number of Observations = 64 Blind Sample ID = N36 Mean = 0.98 % Relative Standard Deviation = 10.9 Number of Observations = 100 Blind Sample ID = N35 Mean = 0.25 % Relative Standard Deviation = 35.9 Number of Observations = 90 Blind Sample ID = N34 Mean = 1.39 % Relative Standard Deviation = 6.9 Number of Observations = 35 Blind Sample ID = N33 Mean = 0.20 % Relative Standard Deviation = 0.0 Number of Observations = 28 Blind Sample ID = N32 Mean = 0.73 % Relative Standard Deviation = 6.9 Number of Observations = 4 Blind Sample ID = N31 Mean = 0.24 % Relative Standard Deviation = 32.4 Number of Observations = 7 Blind Sample ID = N30
The SGPlot Procedure


- Ammonia+Organic-N, UNF, ASF -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00625, MCode: KJ006
Dates: 10/04/91 through 09/25/92
Open Data Set

Mean = 0.98 % Relative Standard Deviation = 8.6 Number of Observations = 35 Blind Sample ID = N35 Mean = 0.25 % Relative Standard Deviation = 22.5 Number of Observations = 39 Blind Sample ID = N34 Mean = 1.41 % Relative Standard Deviation = 7.3 Number of Observations = 45 Blind Sample ID = N33 Mean = 0.20 % Relative Standard Deviation = 0.0 Number of Observations = 50 Blind Sample ID = N32 Mean = 0.71 % Relative Standard Deviation = 11.0 Number of Observations = 9 Blind Sample ID = N31 Mean = 0.33 % Relative Standard Deviation = 51.9 Number of Observations = 7 Blind Sample ID = N30 Mean = 0.95 % Relative Standard Deviation = 52.3 Number of Observations = 6 Blind Sample ID = 50115-50103
The SGPlot Procedure


- Ammonia+Organic-N, UNF, EPA -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00625, MCode: KJ007
Dates: 02/20/96 through 03/26/99
Open Data Set

Mean = 0.53 % Relative Standard Deviation = 10.8 Number of Observations = 6 Blind Sample ID = NAB Mean = 0.87 % Relative Standard Deviation = 4.6 Number of Observations = 11 Blind Sample ID = N60 Mean = 0.39 % Relative Standard Deviation = 22.9 Number of Observations = 11 Blind Sample ID = N59 Mean = 0.91 % Relative Standard Deviation = 7.4 Number of Observations = 8 Blind Sample ID = N58 Mean = 0.22 % Relative Standard Deviation = 19.0 Number of Observations = 9 Blind Sample ID = N57 Mean = 0.70 % Relative Standard Deviation = 9.7 Number of Observations = 8 Blind Sample ID = N56 Mean = 0.34 % Relative Standard Deviation = 45.5 Number of Observations = 7 Blind Sample ID = N55 Mean = 2.68 % Relative Standard Deviation = 8.9 Number of Observations = 6 Blind Sample ID = N52 Mean = 0.32 % Relative Standard Deviation = 23.8 Number of Observations = 6 Blind Sample ID = N49 Mean = 1.31 % Relative Standard Deviation = 8.9 Number of Observations = 12 Blind Sample ID = N48 Mean = 1.78 % Relative Standard Deviation = 5.4 Number of Observations = 4 Blind Sample ID = N46
The SGPlot Procedure


- Kjeldahl Nitrogen (NH3+org N as N), FIL, CFA -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00623, MCode: KJ002
Dates: 10/11/94 through 09/27/06
Open Data Set

Mean = 0.95 % Relative Standard Deviation = 4.2 Number of Observations = 41 Blind Sample ID = NS9 Mean = 1.15 % Relative Standard Deviation = 6.3 Number of Observations = 42 Blind Sample ID = NS7 Mean = 0.72 % Relative Standard Deviation = 10.7 Number of Observations = 96 Blind Sample ID = NS5 Mean = 1.12 % Relative Standard Deviation = 8.7 Number of Observations = 93 Blind Sample ID = NS3 Mean = 1.81 % Relative Standard Deviation = 3.6 Number of Observations = 18 Blind Sample ID = NS17 Mean = 1.73 % Relative Standard Deviation = 1.6 Number of Observations = 4 Blind Sample ID = NS16 Mean = 0.87 % Relative Standard Deviation = 4.8 Number of Observations = 51 Blind Sample ID = NS15 Mean = 2.92 % Relative Standard Deviation = 3.9 Number of Observations = 54 Blind Sample ID = NS13 Mean = 2.22 % Relative Standard Deviation = 4.5 Number of Observations = 56 Blind Sample ID = NS11 Mean = 0.85 % Relative Standard Deviation = 11.6 Number of Observations = 95 Blind Sample ID = NS1 Mean = 0.43 % Relative Standard Deviation = 15.1 Number of Observations = 29 Blind Sample ID = NAB Mean = 0.52 % Relative Standard Deviation = 4.8 Number of Observations = 22 Blind Sample ID = N90 Mean = 0.28 % Relative Standard Deviation = 8.8 Number of Observations = 22 Blind Sample ID = N89 Mean = 1.29 % Relative Standard Deviation = 2.8 Number of Observations = 16 Blind Sample ID = N88 Mean = 0.28 % Relative Standard Deviation = 10.8 Number of Observations = 24 Blind Sample ID = N87 Mean = 1.00 % Relative Standard Deviation = 3.7 Number of Observations = 23 Blind Sample ID = N86 Mean = 0.18 % Relative Standard Deviation = 10.6 Number of Observations = 23 Blind Sample ID = N85 Mean = 1.07 % Relative Standard Deviation = 3.2 Number of Observations = 23 Blind Sample ID = N84 Mean = 0.23 % Relative Standard Deviation = 12.7 Number of Observations = 20 Blind Sample ID = N83 Mean = 0.84 % Relative Standard Deviation = 4.1 Number of Observations = 24 Blind Sample ID = N82 Mean = 0.20 % Relative Standard Deviation = 24.9 Number of Observations = 24 Blind Sample ID = N81 Mean = 0.82 % Relative Standard Deviation = 5.3 Number of Observations = 22 Blind Sample ID = N80 Mean = 0.17 % Relative Standard Deviation = 13.8 Number of Observations = 4 Blind Sample ID = N79c Mean = 0.15 % Relative Standard Deviation = 40.8 Number of Observations = 18 Blind Sample ID = N79 Mean = 0.90 % Relative Standard Deviation = 4.1 Number of Observations = 48 Blind Sample ID = N78 Mean = 0.09 % Relative Standard Deviation = 34.3 Number of Observations = 48 Blind Sample ID = N77 Mean = 0.95 % Relative Standard Deviation = 3.7 Number of Observations = 42 Blind Sample ID = N76 Mean = 0.10 % Relative Standard Deviation = 17.3 Number of Observations = 32 Blind Sample ID = N75 Mean = 0.84 % Relative Standard Deviation = 5.1 Number of Observations = 48 Blind Sample ID = N74 Mean = 0.13 % Relative Standard Deviation = 31.3 Number of Observations = 48 Blind Sample ID = N73 Mean = 0.80 % Relative Standard Deviation = 5.3 Number of Observations = 47 Blind Sample ID = N72 Mean = 0.07 % Relative Standard Deviation = 23.2 Number of Observations = 37 Blind Sample ID = N71 Mean = 0.68 % Relative Standard Deviation = 4.4 Number of Observations = 24 Blind Sample ID = N70 Mean = 0.08 % Relative Standard Deviation = 18.6 Number of Observations = 34 Blind Sample ID = N69 Mean = 0.60 % Relative Standard Deviation = 5.0 Number of Observations = 37 Blind Sample ID = N68 Mean = 0.45 % Relative Standard Deviation = 8.0 Number of Observations = 36 Blind Sample ID = N67 Mean = 0.94 % Relative Standard Deviation = 4.7 Number of Observations = 59 Blind Sample ID = N66 Mean = 0.15 % Relative Standard Deviation = 20.2 Number of Observations = 60 Blind Sample ID = N65 Mean = 1.55 % Relative Standard Deviation = 6.1 Number of Observations = 60 Blind Sample ID = N64 Mean = 0.19 % Relative Standard Deviation = 18.3 Number of Observations = 60 Blind Sample ID = N63 Mean = 1.12 % Relative Standard Deviation = 6.4 Number of Observations = 59 Blind Sample ID = N62 Mean = 0.11 % Relative Standard Deviation = 80.6 Number of Observations = 26 Blind Sample ID = N61 Mean = 0.90 % Relative Standard Deviation = 9.1 Number of Observations = 58 Blind Sample ID = N60 Mean = 0.36 % Relative Standard Deviation = 9.1 Number of Observations = 60 Blind Sample ID = N59 Mean = 0.93 % Relative Standard Deviation = 8.7 Number of Observations = 59 Blind Sample ID = N58 Mean = 0.23 % Relative Standard Deviation = 18.2 Number of Observations = 59 Blind Sample ID = N57 Mean = 0.72 % Relative Standard Deviation = 6.7 Number of Observations = 60 Blind Sample ID = N56 Mean = 0.29 % Relative Standard Deviation = 30.2 Number of Observations = 59 Blind Sample ID = N55 Mean = 2.38 % Relative Standard Deviation = 8.3 Number of Observations = 30 Blind Sample ID = N52 Mean = 0.25 % Relative Standard Deviation = 20.6 Number of Observations = 30 Blind Sample ID = N49 Mean = 1.24 % Relative Standard Deviation = 7.6 Number of Observations = 57 Blind Sample ID = N48 Mean = 1.79 % Relative Standard Deviation = 4.7 Number of Observations = 70 Blind Sample ID = N46 Mean = 0.20 % Relative Standard Deviation = 0.0 Number of Observations = 9 Blind Sample ID = N45 Mean = 1.19 % Relative Standard Deviation = 9.6 Number of Observations = 50 Blind Sample ID = N44 Mean = 0.20 % Relative Standard Deviation = 9.3 Number of Observations = 81 Blind Sample ID = N43 Mean = 1.63 % Relative Standard Deviation = 6.5 Number of Observations = 10 Blind Sample ID = N42
The SGPlot Procedure


- Kjeldahl Nitrogen (NH3+org N as N), FIL, CFA, ACD -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00623, MCode: KJ003
Dates: 02/20/96 through 09/12/06
Open Data Set

Mean = 0.54 % Relative Standard Deviation = 11.6 Number of Observations = 6 Blind Sample ID = NAB Mean = 0.55 % Relative Standard Deviation = 4.3 Number of Observations = 9 Blind Sample ID = N90 Mean = 0.30 % Relative Standard Deviation = 7.8 Number of Observations = 12 Blind Sample ID = N89 Mean = 1.32 % Relative Standard Deviation = 2.1 Number of Observations = 4 Blind Sample ID = N88 Mean = 0.29 % Relative Standard Deviation = 1.5 Number of Observations = 4 Blind Sample ID = N87 Mean = 0.98 % Relative Standard Deviation = 2.2 Number of Observations = 11 Blind Sample ID = N86 Mean = 0.18 % Relative Standard Deviation = 11.7 Number of Observations = 11 Blind Sample ID = N85 Mean = 1.08 % Relative Standard Deviation = 2.2 Number of Observations = 10 Blind Sample ID = N84 Mean = 0.26 % Relative Standard Deviation = 10.9 Number of Observations = 8 Blind Sample ID = N83 Mean = 0.82 % Relative Standard Deviation = 3.8 Number of Observations = 6 Blind Sample ID = N82 Mean = 0.21 % Relative Standard Deviation = 9.6 Number of Observations = 6 Blind Sample ID = N81 Mean = 0.80 % Relative Standard Deviation = 4.9 Number of Observations = 6 Blind Sample ID = N80 Mean = 0.14 % Relative Standard Deviation = 8.8 Number of Observations = 3 Blind Sample ID = N79 Mean = 0.91 % Relative Standard Deviation = 4.4 Number of Observations = 6 Blind Sample ID = N78 Mean = 0.09 % Relative Standard Deviation = 35.1 Number of Observations = 6 Blind Sample ID = N77 Mean = 0.98 % Relative Standard Deviation = 2.4 Number of Observations = 6 Blind Sample ID = N76 Mean = 0.11 % Relative Standard Deviation = 16.0 Number of Observations = 6 Blind Sample ID = N75 Mean = 0.85 % Relative Standard Deviation = 3.4 Number of Observations = 6 Blind Sample ID = N74 Mean = 0.13 % Relative Standard Deviation = 13.4 Number of Observations = 6 Blind Sample ID = N73 Mean = 0.78 % Relative Standard Deviation = 5.3 Number of Observations = 6 Blind Sample ID = N72 Mean = 0.07 % Relative Standard Deviation = 12.3 Number of Observations = 6 Blind Sample ID = N71 Mean = 0.69 % Relative Standard Deviation = 5.4 Number of Observations = 6 Blind Sample ID = N70 Mean = 0.13 % Relative Standard Deviation = 63.0 Number of Observations = 4 Blind Sample ID = N69 Mean = 0.64 % Relative Standard Deviation = 2.0 Number of Observations = 6 Blind Sample ID = N68 Mean = 0.41 % Relative Standard Deviation = 13.6 Number of Observations = 5 Blind Sample ID = N67 Mean = 0.95 % Relative Standard Deviation = 7.7 Number of Observations = 6 Blind Sample ID = N66 Mean = 0.17 % Relative Standard Deviation = 31.4 Number of Observations = 4 Blind Sample ID = N65 Mean = 1.52 % Relative Standard Deviation = 6.7 Number of Observations = 6 Blind Sample ID = N64 Mean = 0.19 % Relative Standard Deviation = 16.1 Number of Observations = 6 Blind Sample ID = N63 Mean = 1.18 % Relative Standard Deviation = 5.9 Number of Observations = 9 Blind Sample ID = N62 Mean = 0.08 % Relative Standard Deviation = 30.5 Number of Observations = 4 Blind Sample ID = N61 Mean = 0.87 % Relative Standard Deviation = 5.2 Number of Observations = 11 Blind Sample ID = N60 Mean = 0.34 % Relative Standard Deviation = 11.8 Number of Observations = 12 Blind Sample ID = N59 Mean = 0.94 % Relative Standard Deviation = 9.4 Number of Observations = 8 Blind Sample ID = N58 Mean = 0.26 % Relative Standard Deviation = 18.6 Number of Observations = 9 Blind Sample ID = N57 Mean = 0.73 % Relative Standard Deviation = 9.6 Number of Observations = 8 Blind Sample ID = N56 Mean = 0.28 % Relative Standard Deviation = 12.6 Number of Observations = 7 Blind Sample ID = N55 Mean = 2.56 % Relative Standard Deviation = 7.5 Number of Observations = 6 Blind Sample ID = N52 Mean = 0.32 % Relative Standard Deviation = 17.3 Number of Observations = 6 Blind Sample ID = N49 Mean = 1.28 % Relative Standard Deviation = 6.8 Number of Observations = 11 Blind Sample ID = N48 Mean = 1.80 % Relative Standard Deviation = 4.5 Number of Observations = 4 Blind Sample ID = N46
The SGPlot Procedure


- Kjeldahl Nitrogen (NH3+org N as N), UNF, CFA, ACD -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00625, MCode: KJ008
Dates: 11/03/94 through 09/15/06
Open Data Set

Mean = 1.83 % Relative Standard Deviation = 3.2 Number of Observations = 17 Blind Sample ID = NS17 Mean = 1.83 % Relative Standard Deviation = 1.2 Number of Observations = 4 Blind Sample ID = NS16 Mean = 0.87 % Relative Standard Deviation = 4.0 Number of Observations = 51 Blind Sample ID = NS15 Mean = 2.89 % Relative Standard Deviation = 2.9 Number of Observations = 54 Blind Sample ID = NS13 Mean = 2.25 % Relative Standard Deviation = 7.3 Number of Observations = 9 Blind Sample ID = NS11 Mean = 0.46 % Relative Standard Deviation = 11.1 Number of Observations = 30 Blind Sample ID = NAB Mean = 0.52 % Relative Standard Deviation = 5.0 Number of Observations = 21 Blind Sample ID = N90 Mean = 0.30 % Relative Standard Deviation = 20.9 Number of Observations = 22 Blind Sample ID = N89 Mean = 1.32 % Relative Standard Deviation = 2.0 Number of Observations = 16 Blind Sample ID = N88 Mean = 0.30 % Relative Standard Deviation = 15.8 Number of Observations = 24 Blind Sample ID = N87 Mean = 1.01 % Relative Standard Deviation = 3.0 Number of Observations = 23 Blind Sample ID = N86 Mean = 0.18 % Relative Standard Deviation = 7.0 Number of Observations = 23 Blind Sample ID = N85 Mean = 1.09 % Relative Standard Deviation = 3.9 Number of Observations = 23 Blind Sample ID = N84 Mean = 0.23 % Relative Standard Deviation = 6.2 Number of Observations = 20 Blind Sample ID = N83 Mean = 0.84 % Relative Standard Deviation = 4.9 Number of Observations = 24 Blind Sample ID = N82 Mean = 0.21 % Relative Standard Deviation = 11.4 Number of Observations = 23 Blind Sample ID = N81 Mean = 0.79 % Relative Standard Deviation = 5.0 Number of Observations = 22 Blind Sample ID = N80 Mean = 0.16 % Relative Standard Deviation = 6.8 Number of Observations = 4 Blind Sample ID = N79c Mean = 0.15 % Relative Standard Deviation = 26.6 Number of Observations = 18 Blind Sample ID = N79 Mean = 0.90 % Relative Standard Deviation = 6.9 Number of Observations = 64 Blind Sample ID = N78 Mean = 0.09 % Relative Standard Deviation = 23.8 Number of Observations = 66 Blind Sample ID = N77 Mean = 0.94 % Relative Standard Deviation = 3.9 Number of Observations = 66 Blind Sample ID = N76 Mean = 0.11 % Relative Standard Deviation = 17.3 Number of Observations = 66 Blind Sample ID = N75 Mean = 0.86 % Relative Standard Deviation = 4.9 Number of Observations = 59 Blind Sample ID = N74 Mean = 0.14 % Relative Standard Deviation = 33.4 Number of Observations = 60 Blind Sample ID = N73 Mean = 0.81 % Relative Standard Deviation = 9.7 Number of Observations = 60 Blind Sample ID = N72 Mean = 0.08 % Relative Standard Deviation = 48.5 Number of Observations = 47 Blind Sample ID = N71 Mean = 0.71 % Relative Standard Deviation = 4.5 Number of Observations = 60 Blind Sample ID = N70 Mean = 0.09 % Relative Standard Deviation = 36.7 Number of Observations = 40 Blind Sample ID = N69 Mean = 0.63 % Relative Standard Deviation = 5.0 Number of Observations = 58 Blind Sample ID = N68 Mean = 0.46 % Relative Standard Deviation = 11.0 Number of Observations = 58 Blind Sample ID = N67 Mean = 1.00 % Relative Standard Deviation = 4.6 Number of Observations = 60 Blind Sample ID = N66 Mean = 0.16 % Relative Standard Deviation = 16.9 Number of Observations = 39 Blind Sample ID = N65 Mean = 1.66 % Relative Standard Deviation = 5.1 Number of Observations = 54 Blind Sample ID = N64 Mean = 0.21 % Relative Standard Deviation = 28.8 Number of Observations = 59 Blind Sample ID = N63 Mean = 1.14 % Relative Standard Deviation = 9.2 Number of Observations = 70 Blind Sample ID = N62 Mean = 0.08 % Relative Standard Deviation = 17.8 Number of Observations = 19 Blind Sample ID = N61 Mean = 0.88 % Relative Standard Deviation = 14.3 Number of Observations = 55 Blind Sample ID = N60 Mean = 0.35 % Relative Standard Deviation = 18.2 Number of Observations = 59 Blind Sample ID = N59 Mean = 0.91 % Relative Standard Deviation = 5.3 Number of Observations = 59 Blind Sample ID = N58 Mean = 0.21 % Relative Standard Deviation = 17.2 Number of Observations = 59 Blind Sample ID = N57 Mean = 0.71 % Relative Standard Deviation = 6.7 Number of Observations = 55 Blind Sample ID = N56 Mean = 0.29 % Relative Standard Deviation = 14.8 Number of Observations = 46 Blind Sample ID = N55 Mean = 2.45 % Relative Standard Deviation = 6.8 Number of Observations = 30 Blind Sample ID = N52 Mean = 0.22 % Relative Standard Deviation = 18.5 Number of Observations = 30 Blind Sample ID = N49 Mean = 0.40 % Relative Standard Deviation = 15.5 Number of Observations = 58 Blind Sample ID = N47 Mean = 1.73 % Relative Standard Deviation = 4.4 Number of Observations = 7 Blind Sample ID = N46 Mean = 0.22 % Relative Standard Deviation = 18.5 Number of Observations = 73 Blind Sample ID = N45 Mean = 1.15 % Relative Standard Deviation = 11.5 Number of Observations = 24 Blind Sample ID = N44 Mean = 0.21 % Relative Standard Deviation = 18.2 Number of Observations = 50 Blind Sample ID = N43
The SGPlot Procedure


- Nitrate (NO3 as N), FIL, IC, LL -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00618, MCode: ALGOR
Dates: 10/10/01 through 01/02/03
Open Data Set

Mean = 2.63 % Relative Standard Deviation = 1.5 Number of Observations = 7 Blind Sample ID = NS8 Mean = 1.27 % Relative Standard Deviation = 1.8 Number of Observations = 3 Blind Sample ID = NS10 Mean = 0.71 % Relative Standard Deviation = 2.9 Number of Observations = 16 Blind Sample ID = N74 Mean = 0.12 % Relative Standard Deviation = 8.1 Number of Observations = 44 Blind Sample ID = N73 Mean = 0.58 % Relative Standard Deviation = 4.3 Number of Observations = 4 Blind Sample ID = N72
The SGPlot Procedure


- Nitrate plus Nitrite (NO3+NO2 as N), FIL, COL -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00631, MCode: CL045
Dates: 10/04/91 through 09/30/94
Open Data Set

Mean = 1.23 % Relative Standard Deviation = 4.4 Number of Observations = 76 Blind Sample ID = N41 Mean = 0.12 % Relative Standard Deviation = 17.3 Number of Observations = 68 Blind Sample ID = N40 Mean = 0.91 % Relative Standard Deviation = 2.9 Number of Observations = 72 Blind Sample ID = N39 Mean = 0.22 % Relative Standard Deviation = 8.3 Number of Observations = 71 Blind Sample ID = N38 Mean = 0.86 % Relative Standard Deviation = 2.1 Number of Observations = 93 Blind Sample ID = N37 Mean = 0.18 % Relative Standard Deviation = 5.0 Number of Observations = 86 Blind Sample ID = N36 Mean = 0.98 % Relative Standard Deviation = 2.5 Number of Observations = 132 Blind Sample ID = N35 Mean = 0.21 % Relative Standard Deviation = 11.2 Number of Observations = 123 Blind Sample ID = N34 Mean = 0.60 % Relative Standard Deviation = 5.1 Number of Observations = 50 Blind Sample ID = N33 Mean = 0.13 % Relative Standard Deviation = 13.2 Number of Observations = 47 Blind Sample ID = N32 Mean = 1.44 % Relative Standard Deviation = 7.9 Number of Observations = 7 Blind Sample ID = N31 Mean = 0.42 % Relative Standard Deviation = 9.6 Number of Observations = 9 Blind Sample ID = N30
The SGPlot Procedure


- Nitrate plus Nitrite (NO3+NO2 as N), FIL, COL -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00631, MCode: CL048
Dates: 10/11/94 through 09/27/06
Open Data Set

Mean = 2.67 % Relative Standard Deviation = 2.4 Number of Observations = 43 Blind Sample ID = NS8 Mean = 3.13 % Relative Standard Deviation = 2.2 Number of Observations = 42 Blind Sample ID = NS6 Mean = 0.43 % Relative Standard Deviation = 4.0 Number of Observations = 94 Blind Sample ID = NS4 Mean = 1.04 % Relative Standard Deviation = 5.1 Number of Observations = 189 Blind Sample ID = NS2 Mean = 0.74 % Relative Standard Deviation = 2.8 Number of Observations = 21 Blind Sample ID = NS16 Mean = 0.23 % Relative Standard Deviation = 4.4 Number of Observations = 45 Blind Sample ID = NS14 Mean = 0.39 % Relative Standard Deviation = 3.4 Number of Observations = 55 Blind Sample ID = NS12 Mean = 1.31 % Relative Standard Deviation = 3.7 Number of Observations = 56 Blind Sample ID = NS10 Mean = 0.33 % Relative Standard Deviation = 10.3 Number of Observations = 59 Blind Sample ID = NAB Mean = 0.76 % Relative Standard Deviation = 2.3 Number of Observations = 21 Blind Sample ID = N90 Mean = 0.27 % Relative Standard Deviation = 6.0 Number of Observations = 22 Blind Sample ID = N89 Mean = 1.36 % Relative Standard Deviation = 3.6 Number of Observations = 16 Blind Sample ID = N88 Mean = 0.19 % Relative Standard Deviation = 3.6 Number of Observations = 24 Blind Sample ID = N87 Mean = 0.68 % Relative Standard Deviation = 2.4 Number of Observations = 23 Blind Sample ID = N86 Mean = 0.17 % Relative Standard Deviation = 5.3 Number of Observations = 23 Blind Sample ID = N85 Mean = 1.20 % Relative Standard Deviation = 2.2 Number of Observations = 23 Blind Sample ID = N84 Mean = 0.06 % Relative Standard Deviation = 13.1 Number of Observations = 20 Blind Sample ID = N83 Mean = 1.69 % Relative Standard Deviation = 1.0 Number of Observations = 24 Blind Sample ID = N82 Mean = 0.18 % Relative Standard Deviation = 11.1 Number of Observations = 24 Blind Sample ID = N81 Mean = 0.89 % Relative Standard Deviation = 2.5 Number of Observations = 21 Blind Sample ID = N80 Mean = 0.17 % Relative Standard Deviation = 9.0 Number of Observations = 4 Blind Sample ID = N79c Mean = 0.13 % Relative Standard Deviation = 10.8 Number of Observations = 19 Blind Sample ID = N79 Mean = 0.89 % Relative Standard Deviation = 4.0 Number of Observations = 48 Blind Sample ID = N78 Mean = 0.07 % Relative Standard Deviation = 19.1 Number of Observations = 46 Blind Sample ID = N77 Mean = 0.91 % Relative Standard Deviation = 3.1 Number of Observations = 42 Blind Sample ID = N76 Mean = 0.09 % Relative Standard Deviation = 10.4 Number of Observations = 32 Blind Sample ID = N75 Mean = 0.88 % Relative Standard Deviation = 2.8 Number of Observations = 48 Blind Sample ID = N74 Mean = 0.12 % Relative Standard Deviation = 8.2 Number of Observations = 48 Blind Sample ID = N73 Mean = 0.62 % Relative Standard Deviation = 5.1 Number of Observations = 47 Blind Sample ID = N72 Mean = 0.06 % Relative Standard Deviation = 9.3 Number of Observations = 48 Blind Sample ID = N71 Mean = 0.97 % Relative Standard Deviation = 3.8 Number of Observations = 24 Blind Sample ID = N70 Mean = 0.08 % Relative Standard Deviation = 7.1 Number of Observations = 34 Blind Sample ID = N69 Mean = 1.67 % Relative Standard Deviation = 1.3 Number of Observations = 37 Blind Sample ID = N68 Mean = 0.21 % Relative Standard Deviation = 5.7 Number of Observations = 36 Blind Sample ID = N67 Mean = 0.93 % Relative Standard Deviation = 2.8 Number of Observations = 59 Blind Sample ID = N66 Mean = 0.06 % Relative Standard Deviation = 10.2 Number of Observations = 4 Blind Sample ID = N65 Mean = 1.27 % Relative Standard Deviation = 3.7 Number of Observations = 59 Blind Sample ID = N64 Mean = 0.08 % Relative Standard Deviation = 24.0 Number of Observations = 60 Blind Sample ID = N63 Mean = 0.90 % Relative Standard Deviation = 5.6 Number of Observations = 60 Blind Sample ID = N62 Mean = 0.06 % Relative Standard Deviation = 12.1 Number of Observations = 9 Blind Sample ID = N61 Mean = 0.86 % Relative Standard Deviation = 5.3 Number of Observations = 60 Blind Sample ID = N60 Mean = 0.35 % Relative Standard Deviation = 7.1 Number of Observations = 60 Blind Sample ID = N59 Mean = 0.98 % Relative Standard Deviation = 5.9 Number of Observations = 61 Blind Sample ID = N58 Mean = 0.21 % Relative Standard Deviation = 12.5 Number of Observations = 59 Blind Sample ID = N57 Mean = 0.71 % Relative Standard Deviation = 4.9 Number of Observations = 58 Blind Sample ID = N56 Mean = 0.43 % Relative Standard Deviation = 8.2 Number of Observations = 53 Blind Sample ID = N55 Mean = 1.73 % Relative Standard Deviation = 4.2 Number of Observations = 60 Blind Sample ID = N52 Mean = 0.75 % Relative Standard Deviation = 8.0 Number of Observations = 54 Blind Sample ID = N48 Mean = 0.23 % Relative Standard Deviation = 11.2 Number of Observations = 58 Blind Sample ID = N47 Mean = 1.22 % Relative Standard Deviation = 5.2 Number of Observations = 76 Blind Sample ID = N46 Mean = 0.27 % Relative Standard Deviation = 8.3 Number of Observations = 82 Blind Sample ID = N45 Mean = 0.78 % Relative Standard Deviation = 5.9 Number of Observations = 73 Blind Sample ID = N44 Mean = 0.14 % Relative Standard Deviation = 14.4 Number of Observations = 80 Blind Sample ID = N43 Mean = 1.90 % Relative Standard Deviation = 0.0 Number of Observations = 10 Blind Sample ID = N42
The SGPlot Procedure


- Nitrate plus Nitrite (NO3+NO2 as N), FIL, COL, LL -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00631, MCode: CL049
Dates: 10/08/91 through 09/28/94
Open Data Set

Mean = 0.11 % Relative Standard Deviation = 5.5 Number of Observations = 36 Blind Sample ID = N40 Mean = 0.20 % Relative Standard Deviation = 4.4 Number of Observations = 33 Blind Sample ID = N38 Mean = 0.17 % Relative Standard Deviation = 13.2 Number of Observations = 24 Blind Sample ID = N36 Mean = 0.20 % Relative Standard Deviation = 10.0 Number of Observations = 30 Blind Sample ID = N34 Mean = 0.11 % Relative Standard Deviation = 16.0 Number of Observations = 16 Blind Sample ID = N32 Mean = 0.45 % Relative Standard Deviation = 4.8 Number of Observations = 4 Blind Sample ID = N30
The SGPlot Procedure


- Nitrate plus Nitrite (NO3+NO2 as N), FIL, COL, LL -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00631, MCode: CL050
Dates: 11/03/94 through 09/25/06
Open Data Set

Mean = 0.33 % Relative Standard Deviation = 4.1 Number of Observations = 11 Blind Sample ID = NAB Mean = 0.07 % Relative Standard Deviation = 2.6 Number of Observations = 33 Blind Sample ID = N90X Mean = 0.27 % Relative Standard Deviation = 2.2 Number of Observations = 35 Blind Sample ID = N89 Mean = 0.13 % Relative Standard Deviation = 3.2 Number of Observations = 24 Blind Sample ID = N88X Mean = 0.19 % Relative Standard Deviation = 4.1 Number of Observations = 36 Blind Sample ID = N87 Mean = 0.07 % Relative Standard Deviation = 6.3 Number of Observations = 20 Blind Sample ID = N86X Mean = 0.17 % Relative Standard Deviation = 4.2 Number of Observations = 46 Blind Sample ID = N85 Mean = 0.12 % Relative Standard Deviation = 3.0 Number of Observations = 21 Blind Sample ID = N84X Mean = 0.06 % Relative Standard Deviation = 3.9 Number of Observations = 40 Blind Sample ID = N83 Mean = 0.16 % Relative Standard Deviation = 2.5 Number of Observations = 24 Blind Sample ID = N82X Mean = 0.18 % Relative Standard Deviation = 3.3 Number of Observations = 47 Blind Sample ID = N81 Mean = 0.09 % Relative Standard Deviation = 4.0 Number of Observations = 18 Blind Sample ID = N80X Mean = 0.91 % Relative Standard Deviation = 0.4 Number of Observations = 4 Blind Sample ID = N80 Mean = 0.16 % Relative Standard Deviation = 3.0 Number of Observations = 8 Blind Sample ID = N79c Mean = 0.13 % Relative Standard Deviation = 3.2 Number of Observations = 36 Blind Sample ID = N79 Mean = 0.07 % Relative Standard Deviation = 4.3 Number of Observations = 59 Blind Sample ID = N77 Mean = 0.88 % Relative Standard Deviation = 0.8 Number of Observations = 9 Blind Sample ID = N76 Mean = 0.09 % Relative Standard Deviation = 4.8 Number of Observations = 40 Blind Sample ID = N75 Mean = 0.12 % Relative Standard Deviation = 3.9 Number of Observations = 58 Blind Sample ID = N73 Mean = 0.06 % Relative Standard Deviation = 8.3 Number of Observations = 31 Blind Sample ID = N71 Mean = 0.07 % Relative Standard Deviation = 7.5 Number of Observations = 24 Blind Sample ID = N69 Mean = 0.22 % Relative Standard Deviation = 6.3 Number of Observations = 29 Blind Sample ID = N67 Mean = 0.03 % Relative Standard Deviation = 24.6 Number of Observations = 30 Blind Sample ID = N65 Mean = 0.07 % Relative Standard Deviation = 19.9 Number of Observations = 35 Blind Sample ID = N63 Mean = 0.03 % Relative Standard Deviation = 21.0 Number of Observations = 21 Blind Sample ID = N61 Mean = 0.36 % Relative Standard Deviation = 4.6 Number of Observations = 42 Blind Sample ID = N59 Mean = 0.20 % Relative Standard Deviation = 7.9 Number of Observations = 35 Blind Sample ID = N57 Mean = 0.43 % Relative Standard Deviation = 3.2 Number of Observations = 30 Blind Sample ID = N55 Mean = 0.22 % Relative Standard Deviation = 5.3 Number of Observations = 5 Blind Sample ID = N47 Mean = 1.24 % Relative Standard Deviation = 5.1 Number of Observations = 14 Blind Sample ID = N46 Mean = 0.27 % Relative Standard Deviation = 7.0 Number of Observations = 6 Blind Sample ID = N45 Mean = 0.14 % Relative Standard Deviation = 11.1 Number of Observations = 59 Blind Sample ID = N43
The SGPlot Procedure


- Nitrate plus Nitrite (NO3+NO2 as N), FIL, EPA -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00631, MCode: CL047
Dates: 02/20/96 through 09/27/06
Open Data Set

Mean = 0.30 % Relative Standard Deviation = 5.9 Number of Observations = 6 Blind Sample ID = NAB Mean = 0.73 % Relative Standard Deviation = 2.3 Number of Observations = 11 Blind Sample ID = N90 Mean = 0.27 % Relative Standard Deviation = 2.6 Number of Observations = 12 Blind Sample ID = N89 Mean = 1.30 % Relative Standard Deviation = 0.0 Number of Observations = 3 Blind Sample ID = N88 Mean = 0.19 % Relative Standard Deviation = 1.1 Number of Observations = 4 Blind Sample ID = N87 Mean = 0.68 % Relative Standard Deviation = 0.7 Number of Observations = 11 Blind Sample ID = N86 Mean = 0.17 % Relative Standard Deviation = 1.0 Number of Observations = 12 Blind Sample ID = N85 Mean = 1.22 % Relative Standard Deviation = 0.9 Number of Observations = 10 Blind Sample ID = N84 Mean = 0.06 % Relative Standard Deviation = 10.2 Number of Observations = 8 Blind Sample ID = N83 Mean = 1.65 % Relative Standard Deviation = 2.8 Number of Observations = 6 Blind Sample ID = N82 Mean = 0.17 % Relative Standard Deviation = 5.1 Number of Observations = 6 Blind Sample ID = N81 Mean = 0.91 % Relative Standard Deviation = 2.4 Number of Observations = 6 Blind Sample ID = N80 Mean = 0.13 % Relative Standard Deviation = 1.2 Number of Observations = 3 Blind Sample ID = N79 Mean = 0.84 % Relative Standard Deviation = 2.3 Number of Observations = 6 Blind Sample ID = N78 Mean = 0.06 % Relative Standard Deviation = 9.8 Number of Observations = 6 Blind Sample ID = N77 Mean = 0.89 % Relative Standard Deviation = 2.8 Number of Observations = 6 Blind Sample ID = N76 Mean = 0.08 % Relative Standard Deviation = 10.8 Number of Observations = 6 Blind Sample ID = N75 Mean = 0.85 % Relative Standard Deviation = 4.2 Number of Observations = 6 Blind Sample ID = N74 Mean = 0.11 % Relative Standard Deviation = 14.1 Number of Observations = 6 Blind Sample ID = N73 Mean = 0.61 % Relative Standard Deviation = 4.1 Number of Observations = 6 Blind Sample ID = N72 Mean = 0.06 % Relative Standard Deviation = 23.1 Number of Observations = 6 Blind Sample ID = N71 Mean = 0.99 % Relative Standard Deviation = 2.5 Number of Observations = 6 Blind Sample ID = N70 Mean = 0.07 % Relative Standard Deviation = 12.3 Number of Observations = 4 Blind Sample ID = N69 Mean = 1.70 % Relative Standard Deviation = 1.8 Number of Observations = 6 Blind Sample ID = N68 Mean = 0.21 % Relative Standard Deviation = 5.4 Number of Observations = 5 Blind Sample ID = N67 Mean = 0.92 % Relative Standard Deviation = 1.4 Number of Observations = 6 Blind Sample ID = N66 Mean = 1.26 % Relative Standard Deviation = 1.2 Number of Observations = 6 Blind Sample ID = N64 Mean = 0.08 % Relative Standard Deviation = 8.9 Number of Observations = 6 Blind Sample ID = N63 Mean = 0.91 % Relative Standard Deviation = 2.7 Number of Observations = 11 Blind Sample ID = N62 Mean = 0.84 % Relative Standard Deviation = 5.6 Number of Observations = 11 Blind Sample ID = N60 Mean = 0.30 % Relative Standard Deviation = 9.1 Number of Observations = 12 Blind Sample ID = N59 Mean = 0.91 % Relative Standard Deviation = 6.2 Number of Observations = 6 Blind Sample ID = N58 Mean = 0.18 % Relative Standard Deviation = 11.6 Number of Observations = 9 Blind Sample ID = N57 Mean = 0.69 % Relative Standard Deviation = 5.6 Number of Observations = 8 Blind Sample ID = N56 Mean = 0.36 % Relative Standard Deviation = 5.5 Number of Observations = 7 Blind Sample ID = N55 Mean = 1.64 % Relative Standard Deviation = 2.4 Number of Observations = 6 Blind Sample ID = N52 Mean = 0.70 % Relative Standard Deviation = 5.0 Number of Observations = 11 Blind Sample ID = N48 Mean = 1.23 % Relative Standard Deviation = 4.1 Number of Observations = 4 Blind Sample ID = N46
The SGPlot Procedure


- Nitrate plus Nitrite (NO3+NO2 as N), UNF -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00630, MCode:
Dates: 10/04/91 through 10/05/93
Open Data Set

Mean = 0.86 % Relative Standard Deviation = 2.1 Number of Observations = 90 Blind Sample ID = N37 Mean = 0.18 % Relative Standard Deviation = 7.7 Number of Observations = 109 Blind Sample ID = N36 Mean = 0.98 % Relative Standard Deviation = 2.6 Number of Observations = 125 Blind Sample ID = N35 Mean = 0.21 % Relative Standard Deviation = 11.5 Number of Observations = 146 Blind Sample ID = N34 Mean = 0.60 % Relative Standard Deviation = 5.6 Number of Observations = 38 Blind Sample ID = N33 Mean = 0.13 % Relative Standard Deviation = 16.3 Number of Observations = 56 Blind Sample ID = N32 Mean = 1.44 % Relative Standard Deviation = 7.9 Number of Observations = 7 Blind Sample ID = N31 Mean = 0.44 % Relative Standard Deviation = 8.4 Number of Observations = 10 Blind Sample ID = N30
The SGPlot Procedure


- Nitrate plus Nitrite (NO3+NO2 as N), UNF -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00630, MCode: CL001
Dates: 10/08/91 through 10/15/92
Open Data Set

Mean = 0.20 % Relative Standard Deviation = 3.7 Number of Observations = 11 Blind Sample ID = N34 Mean = 0.11 % Relative Standard Deviation = 25.2 Number of Observations = 9 Blind Sample ID = N32
The SGPlot Procedure


- Nitrate plus Nitrite (NO3+NO2 as N), UNF -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00630, MCode: CL081
Dates: 10/04/91 through 09/25/92
Open Data Set

Mean = 0.97 % Relative Standard Deviation = 2.4 Number of Observations = 35 Blind Sample ID = N35 Mean = 0.20 % Relative Standard Deviation = 5.0 Number of Observations = 39 Blind Sample ID = N34 Mean = 0.58 % Relative Standard Deviation = 5.3 Number of Observations = 44 Blind Sample ID = N33 Mean = 0.13 % Relative Standard Deviation = 16.3 Number of Observations = 50 Blind Sample ID = N32 Mean = 1.40 % Relative Standard Deviation = 3.6 Number of Observations = 9 Blind Sample ID = N31 Mean = 0.40 % Relative Standard Deviation = 3.7 Number of Observations = 7 Blind Sample ID = N30 Mean = 2.50 % Relative Standard Deviation = 76.4 Number of Observations = 6 Blind Sample ID = 50115-50103
The SGPlot Procedure


- Nitrite (NO2 as N), FIL, COL -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00613, MCode: CL040
Dates: 10/04/91 through 09/30/94
Open Data Set

Mean = 0.34 % Relative Standard Deviation = 3.7 Number of Observations = 76 Blind Sample ID = N41 Mean = 0.03 % Relative Standard Deviation = 13.4 Number of Observations = 68 Blind Sample ID = N40 Mean = 0.23 % Relative Standard Deviation = 12.3 Number of Observations = 73 Blind Sample ID = N39 Mean = 0.07 % Relative Standard Deviation = 13.8 Number of Observations = 71 Blind Sample ID = N38 Mean = 0.26 % Relative Standard Deviation = 1.9 Number of Observations = 93 Blind Sample ID = N37 Mean = 0.05 % Relative Standard Deviation = 6.2 Number of Observations = 86 Blind Sample ID = N36 Mean = 0.05 % Relative Standard Deviation = 26.7 Number of Observations = 133 Blind Sample ID = N35 Mean = 0.01 % Relative Standard Deviation = 45.1 Number of Observations = 124 Blind Sample ID = N34 Mean = 0.02 % Relative Standard Deviation = 33.6 Number of Observations = 50 Blind Sample ID = N33 Mean = 0.01 % Relative Standard Deviation = 19.6 Number of Observations = 47 Blind Sample ID = N32 Mean = 0.06 % Relative Standard Deviation = 9.6 Number of Observations = 7 Blind Sample ID = N31 Mean = 0.05 % Relative Standard Deviation = 15.1 Number of Observations = 10 Blind Sample ID = N30
The SGPlot Procedure


- Nitrite (NO2 as N), FIL, COL -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00613, MCode: CL041
Dates: 10/11/94 through 07/15/02
Open Data Set

Mean = 0.06 % Relative Standard Deviation = 16.9 Number of Observations = 30 Blind Sample ID = NAB Mean = 0.18 % Relative Standard Deviation = 1.8 Number of Observations = 16 Blind Sample ID = N74 Mean = 0.01 % Relative Standard Deviation = 14.5 Number of Observations = 6 Blind Sample ID = N72 Mean = 0.33 % Relative Standard Deviation = 18.5 Number of Observations = 30 Blind Sample ID = N52 Mean = 0.04 % Relative Standard Deviation = 40.0 Number of Observations = 30 Blind Sample ID = N49 Mean = 0.05 % Relative Standard Deviation = 21.9 Number of Observations = 57 Blind Sample ID = N48 Mean = 0.01 % Relative Standard Deviation = 48.4 Number of Observations = 70 Blind Sample ID = N46 Mean = 0.02 % Relative Standard Deviation = 30.0 Number of Observations = 9 Blind Sample ID = N45 Mean = 0.13 % Relative Standard Deviation = 57.2 Number of Observations = 50 Blind Sample ID = N44 Mean = 0.03 % Relative Standard Deviation = 19.1 Number of Observations = 30 Blind Sample ID = N43 Mean = 0.43 % Relative Standard Deviation = 1.6 Number of Observations = 10 Blind Sample ID = N42
The SGPlot Procedure


- Nitrite (NO2 as N), FIL, COL, LL -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00613, MCode: CL042
Dates: 10/08/91 through 09/28/94
Open Data Set

Mean = 0.03 % Relative Standard Deviation = 16.0 Number of Observations = 36 Blind Sample ID = N40 Mean = 0.07 % Relative Standard Deviation = 21.5 Number of Observations = 34 Blind Sample ID = N38 Mean = 0.05 % Relative Standard Deviation = 10.1 Number of Observations = 24 Blind Sample ID = N36 Mean = 0.01 % Relative Standard Deviation = 64.1 Number of Observations = 30 Blind Sample ID = N34 Mean = 0.01 % Relative Standard Deviation = 24.8 Number of Observations = 16 Blind Sample ID = N32 Mean = 0.06 % Relative Standard Deviation = 14.4 Number of Observations = 4 Blind Sample ID = N30
The SGPlot Procedure


- Nitrite (NO2 as N), FIL, COL, LL -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00613, MCode: CL043
Dates: 11/03/94 through 06/17/98
Open Data Set

Mean = 0.06 % Relative Standard Deviation = 20.6 Number of Observations = 12 Blind Sample ID = NAB Mean = 0.03 % Relative Standard Deviation = 55.2 Number of Observations = 12 Blind Sample ID = N49 Mean = 0.02 % Relative Standard Deviation = 59.1 Number of Observations = 6 Blind Sample ID = N47 Mean = 0.02 % Relative Standard Deviation = 28.2 Number of Observations = 14 Blind Sample ID = N46 Mean = 0.01 % Relative Standard Deviation = 54.9 Number of Observations = 6 Blind Sample ID = N45 Mean = 0.03 % Relative Standard Deviation = 26.4 Number of Observations = 65 Blind Sample ID = N43
The SGPlot Procedure


- Nitrite (NO2 as N), UNF -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00615, MCode: CL076
Dates: 10/04/91 through 09/25/92
Open Data Set

Mean = 0.07 % Relative Standard Deviation = 23.3 Number of Observations = 35 Blind Sample ID = N35 Mean = 0.01 % Relative Standard Deviation = 38.5 Number of Observations = 39 Blind Sample ID = N34 Mean = 0.02 % Relative Standard Deviation = 40.9 Number of Observations = 44 Blind Sample ID = N33 Mean = 0.01 % Relative Standard Deviation = 44.3 Number of Observations = 50 Blind Sample ID = N32 Mean = 0.06 % Relative Standard Deviation = 10.7 Number of Observations = 9 Blind Sample ID = N31 Mean = 0.05 % Relative Standard Deviation = 0.0 Number of Observations = 7 Blind Sample ID = N30 Mean = 0.05 % Relative Standard Deviation = 46.1 Number of Observations = 6 Blind Sample ID = 50115-50103
The SGPlot Procedure


- Nitrite (NO2 as N), UNF -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00615, MCode: CL077
Dates: 10/08/91 through 10/15/92
Open Data Set

Mean = 0.01 % Relative Standard Deviation = 43.9 Number of Observations = 11 Blind Sample ID = N34 Mean = 0.01 % Relative Standard Deviation = 31.5 Number of Observations = 9 Blind Sample ID = N32
The SGPlot Procedure


- Orthophosphate (PO4 as P), FIL, COL -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00671, MCode: CL053
Dates: 10/11/94 through 06/13/06
Open Data Set

Mean = 0.35 % Relative Standard Deviation = 3.6 Number of Observations = 43 Blind Sample ID = NS8 Mean = 0.43 % Relative Standard Deviation = 0.9 Number of Observations = 4 Blind Sample ID = NS7 Mean = 0.65 % Relative Standard Deviation = 1.9 Number of Observations = 42 Blind Sample ID = NS6 Mean = 0.27 % Relative Standard Deviation = 4.3 Number of Observations = 9 Blind Sample ID = NS5 Mean = 1.49 % Relative Standard Deviation = 4.5 Number of Observations = 89 Blind Sample ID = NS4 Mean = 1.01 % Relative Standard Deviation = 4.8 Number of Observations = 188 Blind Sample ID = NS2 Mean = 0.86 % Relative Standard Deviation = 1.8 Number of Observations = 7 Blind Sample ID = NS16 Mean = 0.17 % Relative Standard Deviation = 4.1 Number of Observations = 45 Blind Sample ID = NS14 Mean = 0.36 % Relative Standard Deviation = 5.1 Number of Observations = 55 Blind Sample ID = NS12 Mean = 0.29 % Relative Standard Deviation = 4.4 Number of Observations = 56 Blind Sample ID = NS10 Mean = 0.24 % Relative Standard Deviation = 9.3 Number of Observations = 45 Blind Sample ID = NAB Mean = 0.45 % Relative Standard Deviation = 2.4 Number of Observations = 8 Blind Sample ID = N90 Mean = 0.27 % Relative Standard Deviation = 2.2 Number of Observations = 8 Blind Sample ID = N89 Mean = 1.16 % Relative Standard Deviation = 2.7 Number of Observations = 24 Blind Sample ID = N88 Mean = 0.18 % Relative Standard Deviation = 2.2 Number of Observations = 24 Blind Sample ID = N87 Mean = 0.16 % Relative Standard Deviation = 5.3 Number of Observations = 23 Blind Sample ID = N85 Mean = 0.68 % Relative Standard Deviation = 1.7 Number of Observations = 23 Blind Sample ID = N84 Mean = 0.15 % Relative Standard Deviation = 3.7 Number of Observations = 20 Blind Sample ID = N83 Mean = 0.86 % Relative Standard Deviation = 1.5 Number of Observations = 24 Blind Sample ID = N82 Mean = 0.07 % Relative Standard Deviation = 6.1 Number of Observations = 24 Blind Sample ID = N81 Mean = 0.12 % Relative Standard Deviation = 7.7 Number of Observations = 4 Blind Sample ID = N79c Mean = 0.10 % Relative Standard Deviation = 3.5 Number of Observations = 19 Blind Sample ID = N79 Mean = 0.63 % Relative Standard Deviation = 2.8 Number of Observations = 47 Blind Sample ID = N78 Mean = 0.06 % Relative Standard Deviation = 5.3 Number of Observations = 45 Blind Sample ID = N77 Mean = 0.97 % Relative Standard Deviation = 2.6 Number of Observations = 45 Blind Sample ID = N76 Mean = 0.10 % Relative Standard Deviation = 3.7 Number of Observations = 32 Blind Sample ID = N75 Mean = 0.76 % Relative Standard Deviation = 1.1 Number of Observations = 48 Blind Sample ID = N74 Mean = 0.13 % Relative Standard Deviation = 5.8 Number of Observations = 48 Blind Sample ID = N73 Mean = 0.75 % Relative Standard Deviation = 2.5 Number of Observations = 47 Blind Sample ID = N72 Mean = 0.06 % Relative Standard Deviation = 7.1 Number of Observations = 48 Blind Sample ID = N71 Mean = 0.08 % Relative Standard Deviation = 4.7 Number of Observations = 34 Blind Sample ID = N69 Mean = 0.82 % Relative Standard Deviation = 1.3 Number of Observations = 37 Blind Sample ID = N68 Mean = 0.27 % Relative Standard Deviation = 2.0 Number of Observations = 36 Blind Sample ID = N67 Mean = 0.81 % Relative Standard Deviation = 3.3 Number of Observations = 59 Blind Sample ID = N66 Mean = 0.11 % Relative Standard Deviation = 7.0 Number of Observations = 59 Blind Sample ID = N65 Mean = 0.88 % Relative Standard Deviation = 4.4 Number of Observations = 60 Blind Sample ID = N64 Mean = 0.15 % Relative Standard Deviation = 9.0 Number of Observations = 58 Blind Sample ID = N63 Mean = 0.82 % Relative Standard Deviation = 5.1 Number of Observations = 59 Blind Sample ID = N62 Mean = 0.03 % Relative Standard Deviation = 25.0 Number of Observations = 40 Blind Sample ID = N61 Mean = 0.69 % Relative Standard Deviation = 5.7 Number of Observations = 60 Blind Sample ID = N60 Mean = 0.42 % Relative Standard Deviation = 4.1 Number of Observations = 60 Blind Sample ID = N59 Mean = 0.76 % Relative Standard Deviation = 3.9 Number of Observations = 59 Blind Sample ID = N58 Mean = 0.20 % Relative Standard Deviation = 7.7 Number of Observations = 58 Blind Sample ID = N57 Mean = 0.63 % Relative Standard Deviation = 7.1 Number of Observations = 57 Blind Sample ID = N56 Mean = 0.63 % Relative Standard Deviation = 4.4 Number of Observations = 52 Blind Sample ID = N55 Mean = 0.16 % Relative Standard Deviation = 5.8 Number of Observations = 45 Blind Sample ID = N49 Mean = 0.60 % Relative Standard Deviation = 4.2 Number of Observations = 56 Blind Sample ID = N48 Mean = 0.89 % Relative Standard Deviation = 3.6 Number of Observations = 76 Blind Sample ID = N46 Mean = 0.92 % Relative Standard Deviation = 1.9 Number of Observations = 78 Blind Sample ID = N44 Mean = 0.10 % Relative Standard Deviation = 9.3 Number of Observations = 79 Blind Sample ID = N43 Mean = 1.09 % Relative Standard Deviation = 2.9 Number of Observations = 10 Blind Sample ID = N42
The SGPlot Procedure


- Orthophosphate (PO4 as P), FIL, COL -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00671, MCode: CL054
Dates: 10/04/91 through 09/30/94
Open Data Set

Mean = 1.21 % Relative Standard Deviation = 4.5 Number of Observations = 75 Blind Sample ID = N41 Mean = 0.05 % Relative Standard Deviation = 15.3 Number of Observations = 68 Blind Sample ID = N40 Mean = 0.90 % Relative Standard Deviation = 3.1 Number of Observations = 72 Blind Sample ID = N39 Mean = 0.08 % Relative Standard Deviation = 7.4 Number of Observations = 71 Blind Sample ID = N38 Mean = 1.09 % Relative Standard Deviation = 2.8 Number of Observations = 93 Blind Sample ID = N37 Mean = 0.21 % Relative Standard Deviation = 2.9 Number of Observations = 86 Blind Sample ID = N36 Mean = 0.91 % Relative Standard Deviation = 1.9 Number of Observations = 132 Blind Sample ID = N35 Mean = 0.20 % Relative Standard Deviation = 4.8 Number of Observations = 122 Blind Sample ID = N34 Mean = 0.83 % Relative Standard Deviation = 3.0 Number of Observations = 50 Blind Sample ID = N33 Mean = 0.09 % Relative Standard Deviation = 8.4 Number of Observations = 47 Blind Sample ID = N32 Mean = 1.53 % Relative Standard Deviation = 3.4 Number of Observations = 6 Blind Sample ID = N31 Mean = 0.24 % Relative Standard Deviation = 8.0 Number of Observations = 10 Blind Sample ID = N30
The SGPlot Procedure


- Orthophosphate (PO4 as P), FIL, COL, LL -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00671, MCode: CL057
Dates: 11/03/94 through 06/02/06
Open Data Set

Mean = 0.24 % Relative Standard Deviation = 4.7 Number of Observations = 10 Blind Sample ID = NAB Mean = 0.04 % Relative Standard Deviation = 8.6 Number of Observations = 12 Blind Sample ID = N90X Mean = 0.27 % Relative Standard Deviation = 2.8 Number of Observations = 12 Blind Sample ID = N89 Mean = 0.11 % Relative Standard Deviation = 2.7 Number of Observations = 36 Blind Sample ID = N88X Mean = 0.18 % Relative Standard Deviation = 3.4 Number of Observations = 36 Blind Sample ID = N87 Mean = 0.16 % Relative Standard Deviation = 3.5 Number of Observations = 46 Blind Sample ID = N85 Mean = 0.07 % Relative Standard Deviation = 3.1 Number of Observations = 21 Blind Sample ID = N84X Mean = 0.16 % Relative Standard Deviation = 3.4 Number of Observations = 40 Blind Sample ID = N83 Mean = 0.08 % Relative Standard Deviation = 3.1 Number of Observations = 24 Blind Sample ID = N82X Mean = 0.07 % Relative Standard Deviation = 6.2 Number of Observations = 46 Blind Sample ID = N81 Mean = 0.12 % Relative Standard Deviation = 2.2 Number of Observations = 8 Blind Sample ID = N79c Mean = 0.10 % Relative Standard Deviation = 2.5 Number of Observations = 36 Blind Sample ID = N79 Mean = 0.06 % Relative Standard Deviation = 3.7 Number of Observations = 120 Blind Sample ID = N77 Mean = 0.94 % Relative Standard Deviation = 1.1 Number of Observations = 18 Blind Sample ID = N76 Mean = 0.09 % Relative Standard Deviation = 2.1 Number of Observations = 80 Blind Sample ID = N75 Mean = 0.13 % Relative Standard Deviation = 2.7 Number of Observations = 58 Blind Sample ID = N73 Mean = 0.06 % Relative Standard Deviation = 2.8 Number of Observations = 33 Blind Sample ID = N71 Mean = 0.08 % Relative Standard Deviation = 7.8 Number of Observations = 24 Blind Sample ID = N69 Mean = 0.28 % Relative Standard Deviation = 4.8 Number of Observations = 27 Blind Sample ID = N67 Mean = 0.11 % Relative Standard Deviation = 4.4 Number of Observations = 29 Blind Sample ID = N65 Mean = 0.14 % Relative Standard Deviation = 4.5 Number of Observations = 36 Blind Sample ID = N63 Mean = 0.04 % Relative Standard Deviation = 7.3 Number of Observations = 21 Blind Sample ID = N61 Mean = 0.43 % Relative Standard Deviation = 5.2 Number of Observations = 39 Blind Sample ID = N59 Mean = 0.20 % Relative Standard Deviation = 4.7 Number of Observations = 34 Blind Sample ID = N57 Mean = 0.59 % Relative Standard Deviation = 1.6 Number of Observations = 29 Blind Sample ID = N55 Mean = 0.17 % Relative Standard Deviation = 5.6 Number of Observations = 11 Blind Sample ID = N49 Mean = 0.93 % Relative Standard Deviation = 4.2 Number of Observations = 13 Blind Sample ID = N46 Mean = 0.10 % Relative Standard Deviation = 7.1 Number of Observations = 55 Blind Sample ID = N43
The SGPlot Procedure


- Orthophosphate (PO4 as P), FIL, COL, LL -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00671, MCode: CL058
Dates: 10/21/91 through 09/28/94
Open Data Set

Mean = 0.06 % Relative Standard Deviation = 5.5 Number of Observations = 36 Blind Sample ID = N40 Mean = 0.08 % Relative Standard Deviation = 6.8 Number of Observations = 33 Blind Sample ID = N38 Mean = 0.21 % Relative Standard Deviation = 3.2 Number of Observations = 23 Blind Sample ID = N36 Mean = 0.20 % Relative Standard Deviation = 6.0 Number of Observations = 30 Blind Sample ID = N34 Mean = 0.09 % Relative Standard Deviation = 4.0 Number of Observations = 15 Blind Sample ID = N32
The SGPlot Procedure


- Orthophosphate (PO4 as P), FIL, DA -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00671, MCode: PHM01
Dates: 06/02/06 through 09/26/06
Open Data Set

Mean = 0.84 % Relative Standard Deviation = 1.8 Number of Observations = 14 Blind Sample ID = NS16 Mean = 0.05 % Relative Standard Deviation = 1.8 Number of Observations = 19 Blind Sample ID = N90X Mean = 0.46 % Relative Standard Deviation = 1.9 Number of Observations = 13 Blind Sample ID = N90 Mean = 0.28 % Relative Standard Deviation = 3.8 Number of Observations = 35 Blind Sample ID = N89
The SGPlot Procedure


- Orthophosphate-P, UNF -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 70507, MCode: 00145
Dates: 10/17/91 through 10/15/92
Open Data Set

Mean = 0.20 % Relative Standard Deviation = 4.7 Number of Observations = 11 Blind Sample ID = N34 Mean = 0.10 % Relative Standard Deviation = 3.0 Number of Observations = 8 Blind Sample ID = N32
The SGPlot Procedure


- Orthophosphate-P, UNF -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 70507, MCode: CL085
Dates: 10/04/91 through 09/25/92
Open Data Set

Mean = 0.89 % Relative Standard Deviation = 2.0 Number of Observations = 35 Blind Sample ID = N35 Mean = 0.19 % Relative Standard Deviation = 5.1 Number of Observations = 39 Blind Sample ID = N34 Mean = 0.83 % Relative Standard Deviation = 4.8 Number of Observations = 44 Blind Sample ID = N33 Mean = 0.09 % Relative Standard Deviation = 11.7 Number of Observations = 50 Blind Sample ID = N32 Mean = 1.60 % Relative Standard Deviation = 3.1 Number of Observations = 9 Blind Sample ID = N31 Mean = 0.24 % Relative Standard Deviation = 4.0 Number of Observations = 7 Blind Sample ID = N30 Mean = 0.07 % Relative Standard Deviation = 166.7 Number of Observations = 6 Blind Sample ID = 50115-50103
The SGPlot Procedure


- Phosphorus (as P), FIL, ASF -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00666, MCode: CL061
Dates: 10/04/91 through 09/30/94
Open Data Set

Mean = 1.67 % Relative Standard Deviation = 4.1 Number of Observations = 76 Blind Sample ID = N41 Mean = 0.06 % Relative Standard Deviation = 22.7 Number of Observations = 68 Blind Sample ID = N40 Mean = 0.94 % Relative Standard Deviation = 5.2 Number of Observations = 73 Blind Sample ID = N39 Mean = 0.12 % Relative Standard Deviation = 15.3 Number of Observations = 70 Blind Sample ID = N38 Mean = 1.18 % Relative Standard Deviation = 4.8 Number of Observations = 74 Blind Sample ID = N37 Mean = 0.22 % Relative Standard Deviation = 7.8 Number of Observations = 67 Blind Sample ID = N36 Mean = 0.91 % Relative Standard Deviation = 4.0 Number of Observations = 99 Blind Sample ID = N35 Mean = 0.20 % Relative Standard Deviation = 6.6 Number of Observations = 90 Blind Sample ID = N34 Mean = 0.85 % Relative Standard Deviation = 4.1 Number of Observations = 34 Blind Sample ID = N33 Mean = 0.09 % Relative Standard Deviation = 13.5 Number of Observations = 28 Blind Sample ID = N32 Mean = 1.65 % Relative Standard Deviation = 3.5 Number of Observations = 4 Blind Sample ID = N31 Mean = 0.30 % Relative Standard Deviation = 9.3 Number of Observations = 7 Blind Sample ID = N30
The SGPlot Procedure


- Phosphorus (as P), FIL, CFA, ACD, LL -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00666, MCode: CL019
Dates: 10/23/03 through 09/27/06
Open Data Set

Mean = 0.05 % Relative Standard Deviation = 6.0 Number of Observations = 10 Blind Sample ID = N90X Mean = 0.12 % Relative Standard Deviation = 3.1 Number of Observations = 12 Blind Sample ID = N88X Mean = 0.19 % Relative Standard Deviation = 2.8 Number of Observations = 11 Blind Sample ID = N87 Mean = 0.13 % Relative Standard Deviation = 1.3 Number of Observations = 11 Blind Sample ID = N86X Mean = 0.19 % Relative Standard Deviation = 2.2 Number of Observations = 12 Blind Sample ID = N85 Mean = 0.15 % Relative Standard Deviation = 2.1 Number of Observations = 4 Blind Sample ID = N83 Mean = 0.09 % Relative Standard Deviation = 2.1 Number of Observations = 12 Blind Sample ID = N81 Mean = 0.15 % Relative Standard Deviation = 1.0 Number of Observations = 9 Blind Sample ID = N79
The SGPlot Procedure


- Phosphorus (as P), FIL, CFA, ACD-P, LL -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00666, MCode: CL020
Dates: 07/02/99 through 09/29/06
Open Data Set

Mean = 0.05 % Relative Standard Deviation = 3.7 Number of Observations = 30 Blind Sample ID = N90X Mean = 0.12 % Relative Standard Deviation = 3.2 Number of Observations = 35 Blind Sample ID = N88X Mean = 0.19 % Relative Standard Deviation = 2.2 Number of Observations = 20 Blind Sample ID = N87 Mean = 0.13 % Relative Standard Deviation = 3.0 Number of Observations = 21 Blind Sample ID = N86X Mean = 0.18 % Relative Standard Deviation = 2.5 Number of Observations = 43 Blind Sample ID = N85 Mean = 0.07 % Relative Standard Deviation = 3.8 Number of Observations = 20 Blind Sample ID = N84X Mean = 0.16 % Relative Standard Deviation = 2.5 Number of Observations = 40 Blind Sample ID = N83 Mean = 0.09 % Relative Standard Deviation = 1.9 Number of Observations = 23 Blind Sample ID = N82X Mean = 0.09 % Relative Standard Deviation = 1.9 Number of Observations = 47 Blind Sample ID = N81 Mean = 0.10 % Relative Standard Deviation = 1.5 Number of Observations = 18 Blind Sample ID = N80X Mean = 0.18 % Relative Standard Deviation = 1.8 Number of Observations = 8 Blind Sample ID = N79c Mean = 0.15 % Relative Standard Deviation = 1.8 Number of Observations = 36 Blind Sample ID = N79 Mean = 0.06 % Relative Standard Deviation = 2.4 Number of Observations = 120 Blind Sample ID = N77 Mean = 0.13 % Relative Standard Deviation = 1.9 Number of Observations = 80 Blind Sample ID = N75 Mean = 0.14 % Relative Standard Deviation = 2.3 Number of Observations = 120 Blind Sample ID = N73 Mean = 0.07 % Relative Standard Deviation = 1.7 Number of Observations = 120 Blind Sample ID = N71 Mean = 0.09 % Relative Standard Deviation = 1.7 Number of Observations = 24 Blind Sample ID = N69 Mean = 0.12 % Relative Standard Deviation = 3.4 Number of Observations = 30 Blind Sample ID = N65 Mean = 0.16 % Relative Standard Deviation = 1.7 Number of Observations = 36 Blind Sample ID = N63 Mean = 0.04 % Relative Standard Deviation = 4.2 Number of Observations = 21 Blind Sample ID = N61
The SGPlot Procedure


- Phosphorus (as P), FIL, CFA, ALK-P -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00666, MCode: CL063
Dates: 10/23/03 through 09/29/06
Open Data Set

Mean = 0.23 % Relative Standard Deviation = 4.5 Number of Observations = 26 Blind Sample ID = NS15 Mean = 0.51 % Relative Standard Deviation = 2.8 Number of Observations = 20 Blind Sample ID = NS13 Mean = 0.46 % Relative Standard Deviation = 3.4 Number of Observations = 8 Blind Sample ID = N90 Mean = 0.28 % Relative Standard Deviation = 3.1 Number of Observations = 38 Blind Sample ID = N89 Mean = 1.14 % Relative Standard Deviation = 2.3 Number of Observations = 12 Blind Sample ID = N88 Mean = 0.18 % Relative Standard Deviation = 2.6 Number of Observations = 27 Blind Sample ID = N87 Mean = 1.31 % Relative Standard Deviation = 2.4 Number of Observations = 23 Blind Sample ID = N86 Mean = 0.17 % Relative Standard Deviation = 3.3 Number of Observations = 22 Blind Sample ID = N85 Mean = 0.71 % Relative Standard Deviation = 3.2 Number of Observations = 22 Blind Sample ID = N84 Mean = 0.15 % Relative Standard Deviation = 4.3 Number of Observations = 18 Blind Sample ID = N83 Mean = 0.85 % Relative Standard Deviation = 2.5 Number of Observations = 24 Blind Sample ID = N82 Mean = 0.08 % Relative Standard Deviation = 5.8 Number of Observations = 24 Blind Sample ID = N81 Mean = 1.01 % Relative Standard Deviation = 2.8 Number of Observations = 21 Blind Sample ID = N80 Mean = 0.17 % Relative Standard Deviation = 2.2 Number of Observations = 4 Blind Sample ID = N79c Mean = 0.15 % Relative Standard Deviation = 2.6 Number of Observations = 19 Blind Sample ID = N79
The SGPlot Procedure


- Phosphorus (as P), FIL, CFA, ALK-P, ACD -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00666, MCode: CL062
Dates: 10/16/03 through 09/28/06
Open Data Set

Mean = 0.45 % Relative Standard Deviation = 2.8 Number of Observations = 8 Blind Sample ID = N90 Mean = 0.28 % Relative Standard Deviation = 3.5 Number of Observations = 22 Blind Sample ID = N89 Mean = 1.10 % Relative Standard Deviation = 3.8 Number of Observations = 8 Blind Sample ID = N88 Mean = 0.18 % Relative Standard Deviation = 1.8 Number of Observations = 4 Blind Sample ID = N87 Mean = 1.30 % Relative Standard Deviation = 1.2 Number of Observations = 11 Blind Sample ID = N86 Mean = 0.18 % Relative Standard Deviation = 3.6 Number of Observations = 12 Blind Sample ID = N85 Mean = 0.69 % Relative Standard Deviation = 2.4 Number of Observations = 14 Blind Sample ID = N84 Mean = 0.15 % Relative Standard Deviation = 4.2 Number of Observations = 8 Blind Sample ID = N83 Mean = 0.85 % Relative Standard Deviation = 3.0 Number of Observations = 6 Blind Sample ID = N82 Mean = 0.08 % Relative Standard Deviation = 5.2 Number of Observations = 6 Blind Sample ID = N81 Mean = 0.99 % Relative Standard Deviation = 3.0 Number of Observations = 6 Blind Sample ID = N80 Mean = 0.15 % Relative Standard Deviation = 2.5 Number of Observations = 3 Blind Sample ID = N79
The SGPlot Procedure


- Phosphorus (as P), FIL, CFA, Kjeldahl -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00666, MCode: KJ005
Dates: 10/11/94 through 09/27/06
Open Data Set

Mean = 0.97 % Relative Standard Deviation = 2.7 Number of Observations = 41 Blind Sample ID = NS9 Mean = 0.88 % Relative Standard Deviation = 3.5 Number of Observations = 42 Blind Sample ID = NS7 Mean = 0.54 % Relative Standard Deviation = 4.8 Number of Observations = 94 Blind Sample ID = NS5 Mean = 0.62 % Relative Standard Deviation = 5.3 Number of Observations = 92 Blind Sample ID = NS3 Mean = 0.90 % Relative Standard Deviation = 2.1 Number of Observations = 18 Blind Sample ID = NS17 Mean = 0.90 % Relative Standard Deviation = 1.0 Number of Observations = 4 Blind Sample ID = NS16 Mean = 0.23 % Relative Standard Deviation = 4.0 Number of Observations = 51 Blind Sample ID = NS15 Mean = 0.52 % Relative Standard Deviation = 2.3 Number of Observations = 54 Blind Sample ID = NS13 Mean = 0.80 % Relative Standard Deviation = 4.1 Number of Observations = 56 Blind Sample ID = NS11 Mean = 1.03 % Relative Standard Deviation = 3.8 Number of Observations = 93 Blind Sample ID = NS1 Mean = 0.47 % Relative Standard Deviation = 2.2 Number of Observations = 22 Blind Sample ID = N90 Mean = 0.28 % Relative Standard Deviation = 2.2 Number of Observations = 22 Blind Sample ID = N89 Mean = 1.15 % Relative Standard Deviation = 1.2 Number of Observations = 24 Blind Sample ID = N88 Mean = 0.19 % Relative Standard Deviation = 3.2 Number of Observations = 24 Blind Sample ID = N87 Mean = 1.32 % Relative Standard Deviation = 1.2 Number of Observations = 23 Blind Sample ID = N86 Mean = 0.18 % Relative Standard Deviation = 3.8 Number of Observations = 23 Blind Sample ID = N85 Mean = 0.70 % Relative Standard Deviation = 1.8 Number of Observations = 23 Blind Sample ID = N84 Mean = 0.15 % Relative Standard Deviation = 3.5 Number of Observations = 20 Blind Sample ID = N83 Mean = 0.85 % Relative Standard Deviation = 1.8 Number of Observations = 12 Blind Sample ID = N82 Mean = 0.09 % Relative Standard Deviation = 7.9 Number of Observations = 12 Blind Sample ID = N81 Mean = 1.04 % Relative Standard Deviation = 2.0 Number of Observations = 16 Blind Sample ID = N80 Mean = 0.18 % Relative Standard Deviation = 3.0 Number of Observations = 4 Blind Sample ID = N79c Mean = 0.15 % Relative Standard Deviation = 3.0 Number of Observations = 6 Blind Sample ID = N79 Mean = 0.65 % Relative Standard Deviation = 2.0 Number of Observations = 24 Blind Sample ID = N78 Mean = 0.06 % Relative Standard Deviation = 8.0 Number of Observations = 24 Blind Sample ID = N77 Mean = 0.96 % Relative Standard Deviation = 1.9 Number of Observations = 43 Blind Sample ID = N76 Mean = 0.12 % Relative Standard Deviation = 9.4 Number of Observations = 16 Blind Sample ID = N75 Mean = 0.78 % Relative Standard Deviation = 3.5 Number of Observations = 47 Blind Sample ID = N74 Mean = 0.13 % Relative Standard Deviation = 5.1 Number of Observations = 48 Blind Sample ID = N73 Mean = 0.76 % Relative Standard Deviation = 2.8 Number of Observations = 47 Blind Sample ID = N72 Mean = 0.06 % Relative Standard Deviation = 9.4 Number of Observations = 48 Blind Sample ID = N71 Mean = 0.73 % Relative Standard Deviation = 2.6 Number of Observations = 24 Blind Sample ID = N70 Mean = 0.08 % Relative Standard Deviation = 9.5 Number of Observations = 34 Blind Sample ID = N69 Mean = 0.82 % Relative Standard Deviation = 3.1 Number of Observations = 37 Blind Sample ID = N68 Mean = 0.28 % Relative Standard Deviation = 5.9 Number of Observations = 62 Blind Sample ID = N67 Mean = 0.88 % Relative Standard Deviation = 3.5 Number of Observations = 59 Blind Sample ID = N66 Mean = 0.12 % Relative Standard Deviation = 10.6 Number of Observations = 60 Blind Sample ID = N65 Mean = 0.90 % Relative Standard Deviation = 4.9 Number of Observations = 60 Blind Sample ID = N64 Mean = 0.16 % Relative Standard Deviation = 7.9 Number of Observations = 60 Blind Sample ID = N63 Mean = 0.82 % Relative Standard Deviation = 6.0 Number of Observations = 59 Blind Sample ID = N62 Mean = 0.05 % Relative Standard Deviation = 22.9 Number of Observations = 29 Blind Sample ID = N61 Mean = 0.81 % Relative Standard Deviation = 3.5 Number of Observations = 56 Blind Sample ID = N60 Mean = 0.42 % Relative Standard Deviation = 3.1 Number of Observations = 70 Blind Sample ID = N59 Mean = 0.79 % Relative Standard Deviation = 5.1 Number of Observations = 59 Blind Sample ID = N58 Mean = 0.20 % Relative Standard Deviation = 10.2 Number of Observations = 58 Blind Sample ID = N57 Mean = 0.73 % Relative Standard Deviation = 5.0 Number of Observations = 60 Blind Sample ID = N56 Mean = 0.60 % Relative Standard Deviation = 5.7 Number of Observations = 59 Blind Sample ID = N55 Mean = 0.16 % Relative Standard Deviation = 10.4 Number of Observations = 30 Blind Sample ID = N49 Mean = 0.78 % Relative Standard Deviation = 5.8 Number of Observations = 57 Blind Sample ID = N48 Mean = 1.25 % Relative Standard Deviation = 5.6 Number of Observations = 74 Blind Sample ID = N46 Mean = 0.12 % Relative Standard Deviation = 8.0 Number of Observations = 9 Blind Sample ID = N45 Mean = 0.90 % Relative Standard Deviation = 2.9 Number of Observations = 50 Blind Sample ID = N44 Mean = 0.12 % Relative Standard Deviation = 11.4 Number of Observations = 82 Blind Sample ID = N43 Mean = 1.11 % Relative Standard Deviation = 2.8 Number of Observations = 10 Blind Sample ID = N42
The SGPlot Procedure


- Phosphorus (as P), FIL, COL, LL -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00666, MCode: CL059
Dates: 10/08/91 through 09/28/94
Open Data Set

Mean = 0.06 % Relative Standard Deviation = 5.3 Number of Observations = 36 Blind Sample ID = N40 Mean = 0.13 % Relative Standard Deviation = 3.7 Number of Observations = 33 Blind Sample ID = N38 Mean = 0.22 % Relative Standard Deviation = 6.8 Number of Observations = 24 Blind Sample ID = N36 Mean = 0.21 % Relative Standard Deviation = 3.8 Number of Observations = 29 Blind Sample ID = N34 Mean = 0.09 % Relative Standard Deviation = 3.0 Number of Observations = 15 Blind Sample ID = N32 Mean = 0.26 % Relative Standard Deviation = 11.9 Number of Observations = 4 Blind Sample ID = N30
The SGPlot Procedure


- Phosphorus (as P), FIL, COL, LL -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00666, MCode: CL060
Dates: 10/25/94 through 12/30/98
Open Data Set

Mean = 0.43 % Relative Standard Deviation = 2.2 Number of Observations = 21 Blind Sample ID = N59 Mean = 0.21 % Relative Standard Deviation = 3.4 Number of Observations = 15 Blind Sample ID = N57 Mean = 0.61 % Relative Standard Deviation = 2.9 Number of Observations = 14 Blind Sample ID = N55 Mean = 0.22 % Relative Standard Deviation = 15.2 Number of Observations = 5 Blind Sample ID = N47 Mean = 0.13 % Relative Standard Deviation = 3.9 Number of Observations = 6 Blind Sample ID = N45 Mean = 0.13 % Relative Standard Deviation = 3.9 Number of Observations = 6 Blind Sample ID = N43
The SGPlot Procedure


- Phosphorus (as P), FIL, EPA -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00666, MCode: KJ004
Dates: 02/20/96 through 10/17/02
Open Data Set

Mean = 0.77 % Relative Standard Deviation = 3.6 Number of Observations = 3 Blind Sample ID = N74 Mean = 0.13 % Relative Standard Deviation = 7.4 Number of Observations = 3 Blind Sample ID = N73 Mean = 0.73 % Relative Standard Deviation = 2.1 Number of Observations = 3 Blind Sample ID = N72 Mean = 0.07 % Relative Standard Deviation = 13.0 Number of Observations = 3 Blind Sample ID = N71 Mean = 0.71 % Relative Standard Deviation = 2.1 Number of Observations = 6 Blind Sample ID = N70 Mean = 0.08 % Relative Standard Deviation = 10.6 Number of Observations = 4 Blind Sample ID = N69 Mean = 0.84 % Relative Standard Deviation = 3.2 Number of Observations = 6 Blind Sample ID = N68 Mean = 0.27 % Relative Standard Deviation = 8.8 Number of Observations = 5 Blind Sample ID = N67 Mean = 0.87 % Relative Standard Deviation = 4.5 Number of Observations = 6 Blind Sample ID = N66 Mean = 0.11 % Relative Standard Deviation = 6.6 Number of Observations = 4 Blind Sample ID = N65 Mean = 0.90 % Relative Standard Deviation = 3.4 Number of Observations = 6 Blind Sample ID = N64 Mean = 0.15 % Relative Standard Deviation = 15.7 Number of Observations = 6 Blind Sample ID = N63 Mean = 0.87 % Relative Standard Deviation = 6.2 Number of Observations = 9 Blind Sample ID = N62 Mean = 0.04 % Relative Standard Deviation = 22.9 Number of Observations = 3 Blind Sample ID = N61 Mean = 0.80 % Relative Standard Deviation = 4.2 Number of Observations = 11 Blind Sample ID = N60 Mean = 0.41 % Relative Standard Deviation = 4.1 Number of Observations = 12 Blind Sample ID = N59 Mean = 0.79 % Relative Standard Deviation = 3.7 Number of Observations = 8 Blind Sample ID = N58 Mean = 0.20 % Relative Standard Deviation = 10.5 Number of Observations = 8 Blind Sample ID = N57 Mean = 0.72 % Relative Standard Deviation = 5.4 Number of Observations = 8 Blind Sample ID = N56 Mean = 0.60 % Relative Standard Deviation = 5.2 Number of Observations = 7 Blind Sample ID = N55 Mean = 0.15 % Relative Standard Deviation = 15.8 Number of Observations = 6 Blind Sample ID = N49 Mean = 0.77 % Relative Standard Deviation = 3.3 Number of Observations = 11 Blind Sample ID = N48 Mean = 1.23 % Relative Standard Deviation = 4.1 Number of Observations = 4 Blind Sample ID = N46
The SGPlot Procedure


- Phosphorus (as P), UNF, ASF -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00665, MCode: KJ010
Dates: 10/04/91 through 09/25/92
Open Data Set

Mean = 0.95 % Relative Standard Deviation = 3.6 Number of Observations = 35 Blind Sample ID = N35 Mean = 0.21 % Relative Standard Deviation = 8.1 Number of Observations = 39 Blind Sample ID = N34 Mean = 0.87 % Relative Standard Deviation = 3.3 Number of Observations = 45 Blind Sample ID = N33 Mean = 0.09 % Relative Standard Deviation = 9.7 Number of Observations = 50 Blind Sample ID = N32 Mean = 1.67 % Relative Standard Deviation = 4.2 Number of Observations = 9 Blind Sample ID = N31 Mean = 0.29 % Relative Standard Deviation = 9.3 Number of Observations = 6 Blind Sample ID = N30 Mean = 0.18 % Relative Standard Deviation = 172.0 Number of Observations = 6 Blind Sample ID = 50115-50103
The SGPlot Procedure


- Phosphorus (as P), UNF, ASF, Kjeldahl -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00665, MCode: KJ009
Dates: 11/03/94 through 09/15/06
Open Data Set

Mean = 0.89 % Relative Standard Deviation = 2.9 Number of Observations = 17 Blind Sample ID = NS17 Mean = 0.90 % Relative Standard Deviation = 0.7 Number of Observations = 4 Blind Sample ID = NS16 Mean = 0.23 % Relative Standard Deviation = 3.3 Number of Observations = 51 Blind Sample ID = NS15 Mean = 0.52 % Relative Standard Deviation = 2.5 Number of Observations = 54 Blind Sample ID = NS13 Mean = 0.81 % Relative Standard Deviation = 3.0 Number of Observations = 9 Blind Sample ID = NS11 Mean = 0.46 % Relative Standard Deviation = 2.4 Number of Observations = 21 Blind Sample ID = N90 Mean = 0.28 % Relative Standard Deviation = 2.1 Number of Observations = 22 Blind Sample ID = N89 Mean = 1.15 % Relative Standard Deviation = 1.4 Number of Observations = 24 Blind Sample ID = N88 Mean = 0.19 % Relative Standard Deviation = 2.5 Number of Observations = 24 Blind Sample ID = N87 Mean = 1.31 % Relative Standard Deviation = 1.3 Number of Observations = 23 Blind Sample ID = N86 Mean = 0.17 % Relative Standard Deviation = 2.7 Number of Observations = 23 Blind Sample ID = N85 Mean = 0.70 % Relative Standard Deviation = 2.4 Number of Observations = 23 Blind Sample ID = N84 Mean = 0.15 % Relative Standard Deviation = 5.9 Number of Observations = 20 Blind Sample ID = N83 Mean = 0.84 % Relative Standard Deviation = 1.0 Number of Observations = 24 Blind Sample ID = N82 Mean = 0.08 % Relative Standard Deviation = 6.5 Number of Observations = 24 Blind Sample ID = N81 Mean = 1.02 % Relative Standard Deviation = 2.7 Number of Observations = 26 Blind Sample ID = N80 Mean = 0.18 % Relative Standard Deviation = 2.8 Number of Observations = 4 Blind Sample ID = N79c Mean = 0.15 % Relative Standard Deviation = 5.2 Number of Observations = 18 Blind Sample ID = N79 Mean = 0.65 % Relative Standard Deviation = 2.7 Number of Observations = 30 Blind Sample ID = N78 Mean = 0.06 % Relative Standard Deviation = 13.8 Number of Observations = 30 Blind Sample ID = N77 Mean = 0.95 % Relative Standard Deviation = 2.8 Number of Observations = 51 Blind Sample ID = N76 Mean = 0.12 % Relative Standard Deviation = 9.2 Number of Observations = 30 Blind Sample ID = N75 Mean = 0.76 % Relative Standard Deviation = 3.6 Number of Observations = 59 Blind Sample ID = N74 Mean = 0.13 % Relative Standard Deviation = 5.3 Number of Observations = 60 Blind Sample ID = N73 Mean = 0.75 % Relative Standard Deviation = 2.8 Number of Observations = 60 Blind Sample ID = N72 Mean = 0.06 % Relative Standard Deviation = 11.1 Number of Observations = 60 Blind Sample ID = N71 Mean = 0.72 % Relative Standard Deviation = 3.0 Number of Observations = 60 Blind Sample ID = N70 Mean = 0.07 % Relative Standard Deviation = 11.4 Number of Observations = 40 Blind Sample ID = N69 Mean = 0.84 % Relative Standard Deviation = 2.6 Number of Observations = 60 Blind Sample ID = N68 Mean = 0.28 % Relative Standard Deviation = 20.0 Number of Observations = 86 Blind Sample ID = N67 Mean = 0.89 % Relative Standard Deviation = 2.3 Number of Observations = 60 Blind Sample ID = N66 Mean = 0.12 % Relative Standard Deviation = 7.8 Number of Observations = 39 Blind Sample ID = N65 Mean = 0.92 % Relative Standard Deviation = 4.2 Number of Observations = 55 Blind Sample ID = N64 Mean = 0.15 % Relative Standard Deviation = 11.7 Number of Observations = 60 Blind Sample ID = N63 Mean = 0.83 % Relative Standard Deviation = 5.6 Number of Observations = 68 Blind Sample ID = N62 Mean = 0.04 % Relative Standard Deviation = 19.3 Number of Observations = 18 Blind Sample ID = N61 Mean = 0.81 % Relative Standard Deviation = 3.6 Number of Observations = 53 Blind Sample ID = N60 Mean = 0.41 % Relative Standard Deviation = 5.5 Number of Observations = 67 Blind Sample ID = N59 Mean = 0.79 % Relative Standard Deviation = 4.1 Number of Observations = 60 Blind Sample ID = N58 Mean = 0.20 % Relative Standard Deviation = 9.5 Number of Observations = 60 Blind Sample ID = N57 Mean = 0.72 % Relative Standard Deviation = 5.2 Number of Observations = 55 Blind Sample ID = N56 Mean = 0.60 % Relative Standard Deviation = 4.2 Number of Observations = 46 Blind Sample ID = N55 Mean = 0.15 % Relative Standard Deviation = 14.2 Number of Observations = 30 Blind Sample ID = N49 Mean = 0.21 % Relative Standard Deviation = 9.7 Number of Observations = 58 Blind Sample ID = N47 Mean = 1.24 % Relative Standard Deviation = 6.3 Number of Observations = 7 Blind Sample ID = N46 Mean = 0.13 % Relative Standard Deviation = 10.0 Number of Observations = 73 Blind Sample ID = N45 Mean = 0.89 % Relative Standard Deviation = 5.2 Number of Observations = 28 Blind Sample ID = N44 Mean = 0.12 % Relative Standard Deviation = 13.7 Number of Observations = 50 Blind Sample ID = N43
The SGPlot Procedure


- Phosphorus (as P), UNF, CFA, ACD-P, LL -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00665, MCode: CL021
Dates: 07/02/99 through 09/28/06
Open Data Set

Mean = 0.05 % Relative Standard Deviation = 5.8 Number of Observations = 30 Blind Sample ID = N90X Mean = 0.12 % Relative Standard Deviation = 3.1 Number of Observations = 36 Blind Sample ID = N88X Mean = 0.19 % Relative Standard Deviation = 1.9 Number of Observations = 35 Blind Sample ID = N87 Mean = 0.13 % Relative Standard Deviation = 2.0 Number of Observations = 22 Blind Sample ID = N86X Mean = 0.18 % Relative Standard Deviation = 2.5 Number of Observations = 46 Blind Sample ID = N85 Mean = 0.07 % Relative Standard Deviation = 2.1 Number of Observations = 21 Blind Sample ID = N84X Mean = 0.16 % Relative Standard Deviation = 2.0 Number of Observations = 40 Blind Sample ID = N83 Mean = 0.09 % Relative Standard Deviation = 1.8 Number of Observations = 22 Blind Sample ID = N82X Mean = 0.09 % Relative Standard Deviation = 2.7 Number of Observations = 47 Blind Sample ID = N81 Mean = 0.10 % Relative Standard Deviation = 2.2 Number of Observations = 17 Blind Sample ID = N80X Mean = 0.18 % Relative Standard Deviation = 1.1 Number of Observations = 8 Blind Sample ID = N79c Mean = 0.15 % Relative Standard Deviation = 1.5 Number of Observations = 36 Blind Sample ID = N79 Mean = 0.07 % Relative Standard Deviation = 3.2 Number of Observations = 120 Blind Sample ID = N77 Mean = 0.13 % Relative Standard Deviation = 2.1 Number of Observations = 80 Blind Sample ID = N75 Mean = 0.14 % Relative Standard Deviation = 2.3 Number of Observations = 120 Blind Sample ID = N73 Mean = 0.07 % Relative Standard Deviation = 3.0 Number of Observations = 120 Blind Sample ID = N71 Mean = 0.09 % Relative Standard Deviation = 3.1 Number of Observations = 24 Blind Sample ID = N69 Mean = 0.12 % Relative Standard Deviation = 4.8 Number of Observations = 29 Blind Sample ID = N65 Mean = 0.16 % Relative Standard Deviation = 1.7 Number of Observations = 36 Blind Sample ID = N63 Mean = 0.04 % Relative Standard Deviation = 13.6 Number of Observations = 20 Blind Sample ID = N61
The SGPlot Procedure


- Phosphorus (as P), UNF, CFA, ALK-P, ACD -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00665, MCode: AKP01
Dates: 10/21/03 through 09/29/06
Open Data Set

Mean = 0.23 % Relative Standard Deviation = 4.5 Number of Observations = 27 Blind Sample ID = NS15 Mean = 0.51 % Relative Standard Deviation = 2.7 Number of Observations = 20 Blind Sample ID = NS13 Mean = 0.45 % Relative Standard Deviation = 3.5 Number of Observations = 18 Blind Sample ID = N90 Mean = 0.28 % Relative Standard Deviation = 4.3 Number of Observations = 48 Blind Sample ID = N89 Mean = 1.13 % Relative Standard Deviation = 2.6 Number of Observations = 24 Blind Sample ID = N88 Mean = 0.18 % Relative Standard Deviation = 3.1 Number of Observations = 25 Blind Sample ID = N87 Mean = 1.31 % Relative Standard Deviation = 1.5 Number of Observations = 23 Blind Sample ID = N86 Mean = 0.18 % Relative Standard Deviation = 2.7 Number of Observations = 19 Blind Sample ID = N85 Mean = 0.69 % Relative Standard Deviation = 3.2 Number of Observations = 22 Blind Sample ID = N84 Mean = 0.15 % Relative Standard Deviation = 3.8 Number of Observations = 18 Blind Sample ID = N83 Mean = 0.84 % Relative Standard Deviation = 2.2 Number of Observations = 24 Blind Sample ID = N82 Mean = 0.08 % Relative Standard Deviation = 4.6 Number of Observations = 24 Blind Sample ID = N81 Mean = 0.99 % Relative Standard Deviation = 2.5 Number of Observations = 20 Blind Sample ID = N80 Mean = 0.18 % Relative Standard Deviation = 2.2 Number of Observations = 4 Blind Sample ID = N79c Mean = 0.14 % Relative Standard Deviation = 4.0 Number of Observations = 19 Blind Sample ID = N79
The SGPlot Procedure


- Phosphorus (as P), UNF, COL, LL -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00665, MCode: CL001
Dates: 10/08/91 through 10/15/92
Open Data Set

Mean = 0.21 % Relative Standard Deviation = 2.6 Number of Observations = 11 Blind Sample ID = N34 Mean = 0.10 % Relative Standard Deviation = 22.3 Number of Observations = 9 Blind Sample ID = N32
The SGPlot Procedure


- Phosphorus (as P), UNF, COL, LL -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00665, MCode: CL090
Dates: 11/03/94 through 12/30/98
Open Data Set

Mean = 0.43 % Relative Standard Deviation = 3.1 Number of Observations = 21 Blind Sample ID = N59 Mean = 0.21 % Relative Standard Deviation = 4.1 Number of Observations = 34 Blind Sample ID = N57 Mean = 0.62 % Relative Standard Deviation = 4.3 Number of Observations = 27 Blind Sample ID = N55 Mean = 0.13 % Relative Standard Deviation = 14.4 Number of Observations = 55 Blind Sample ID = N43
The SGPlot Procedure


- Phosphorus (as P), UNF, EPA -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 00665, MCode: KJ011
Dates: 02/20/96 through 03/26/99
Open Data Set

Mean = 0.81 % Relative Standard Deviation = 3.7 Number of Observations = 11 Blind Sample ID = N60 Mean = 0.40 % Relative Standard Deviation = 10.2 Number of Observations = 12 Blind Sample ID = N59 Mean = 0.79 % Relative Standard Deviation = 4.1 Number of Observations = 8 Blind Sample ID = N58 Mean = 0.21 % Relative Standard Deviation = 9.1 Number of Observations = 9 Blind Sample ID = N57 Mean = 0.72 % Relative Standard Deviation = 4.2 Number of Observations = 8 Blind Sample ID = N56 Mean = 0.60 % Relative Standard Deviation = 5.2 Number of Observations = 7 Blind Sample ID = N55 Mean = 0.16 % Relative Standard Deviation = 15.3 Number of Observations = 6 Blind Sample ID = N49 Mean = 0.79 % Relative Standard Deviation = 4.9 Number of Observations = 12 Blind Sample ID = N48 Mean = 1.25 % Relative Standard Deviation = 4.6 Number of Observations = 4 Blind Sample ID = N46
The SGPlot Procedure


- Total Nitrogen (NH3+NO3+NO2+org N as N), FIL, CFA, ALK-P -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 62854, MCode: CL063
Dates: 10/23/03 through 09/29/06
Open Data Set

Mean = 0.86 % Relative Standard Deviation = 3.6 Number of Observations = 27 Blind Sample ID = NS15 Mean = 2.83 % Relative Standard Deviation = 2.4 Number of Observations = 20 Blind Sample ID = NS13 Mean = 1.27 % Relative Standard Deviation = 4.0 Number of Observations = 30 Blind Sample ID = N90 Mean = 0.56 % Relative Standard Deviation = 11.0 Number of Observations = 27 Blind Sample ID = N89 Mean = 2.62 % Relative Standard Deviation = 2.5 Number of Observations = 36 Blind Sample ID = N88 Mean = 0.48 % Relative Standard Deviation = 15.4 Number of Observations = 36 Blind Sample ID = N87 Mean = 1.68 % Relative Standard Deviation = 3.1 Number of Observations = 23 Blind Sample ID = N86 Mean = 0.34 % Relative Standard Deviation = 4.2 Number of Observations = 19 Blind Sample ID = N85 Mean = 2.31 % Relative Standard Deviation = 2.9 Number of Observations = 22 Blind Sample ID = N84 Mean = 0.30 % Relative Standard Deviation = 19.6 Number of Observations = 19 Blind Sample ID = N83 Mean = 2.52 % Relative Standard Deviation = 2.9 Number of Observations = 24 Blind Sample ID = N82 Mean = 0.37 % Relative Standard Deviation = 4.1 Number of Observations = 24 Blind Sample ID = N81 Mean = 1.70 % Relative Standard Deviation = 2.7 Number of Observations = 21 Blind Sample ID = N80 Mean = 0.36 % Relative Standard Deviation = 26.6 Number of Observations = 4 Blind Sample ID = N79c Mean = 0.26 % Relative Standard Deviation = 10.8 Number of Observations = 19 Blind Sample ID = N79
The SGPlot Procedure


- Total Nitrogen (NH3+NO3+NO2+org N as N), FIL, CFA, ALK-P, ACD -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 62854, MCode: CL062
Dates: 10/16/03 through 10/07/05
Open Data Set

Mean = 1.69 % Relative Standard Deviation = 2.1 Number of Observations = 11 Blind Sample ID = N86 Mean = 0.35 % Relative Standard Deviation = 2.9 Number of Observations = 12 Blind Sample ID = N85 Mean = 2.28 % Relative Standard Deviation = 1.6 Number of Observations = 10 Blind Sample ID = N84 Mean = 0.32 % Relative Standard Deviation = 8.9 Number of Observations = 8 Blind Sample ID = N83 Mean = 2.52 % Relative Standard Deviation = 2.2 Number of Observations = 6 Blind Sample ID = N82 Mean = 0.34 % Relative Standard Deviation = 24.6 Number of Observations = 6 Blind Sample ID = N81 Mean = 1.68 % Relative Standard Deviation = 3.5 Number of Observations = 6 Blind Sample ID = N80 Mean = 0.25 % Relative Standard Deviation = 5.2 Number of Observations = 3 Blind Sample ID = N79
The SGPlot Procedure


- Total Nitrogen (NH3+NO3+NO2+org N as N), UNF, CFA, ALK-P, ACD -
Percent Relative Standard Deviation
Lab: NWQL, PCode: 62855, MCode: AKP01
Dates: 10/16/03 through 09/29/06
Open Data Set

Mean = 0.84 % Relative Standard Deviation = 4.9 Number of Observations = 27 Blind Sample ID = NS15 Mean = 2.85 % Relative Standard Deviation = 2.2 Number of Observations = 20 Blind Sample ID = NS13 Mean = 1.25 % Relative Standard Deviation = 3.6 Number of Observations = 30 Blind Sample ID = N90 Mean = 0.54 % Relative Standard Deviation = 5.6 Number of Observations = 26 Blind Sample ID = N89 Mean = 2.60 % Relative Standard Deviation = 3.4 Number of Observations = 36 Blind Sample ID = N88 Mean = 0.46 % Relative Standard Deviation = 4.7 Number of Observations = 36 Blind Sample ID = N87 Mean = 1.69 % Relative Standard Deviation = 2.2 Number of Observations = 23 Blind Sample ID = N86 Mean = 0.35 % Relative Standard Deviation = 3.4 Number of Observations = 19 Blind Sample ID = N85 Mean = 2.29 % Relative Standard Deviation = 3.4 Number of Observations = 22 Blind Sample ID = N84 Mean = 0.31 % Relative Standard Deviation = 19.4 Number of Observations = 18 Blind Sample ID = N83 Mean = 2.51 % Relative Standard Deviation = 2.4 Number of Observations = 24 Blind Sample ID = N82 Mean = 0.36 % Relative Standard Deviation = 6.4 Number of Observations = 24 Blind Sample ID = N81 Mean = 1.66 % Relative Standard Deviation = 2.8 Number of Observations = 21 Blind Sample ID = N80 Mean = 0.31 % Relative Standard Deviation = 2.3 Number of Observations = 4 Blind Sample ID = N79c Mean = 0.25 % Relative Standard Deviation = 5.8 Number of Observations = 19 Blind Sample ID = N79
The SGPlot Procedure