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Scientific Investigations Report 2007–5117

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5117

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Table 9. Summary of pH values in the depth-profile dataset, Upper Klamath and Agency Lakes, Oregon, May–October 1990–2006.

[Values are shown as the number of samples, whereas the percent > 9.7 is shown as a percentage; shading is used to aid the visualization of the increasing percentage of values greater than 9.7. >, greater than; ≤, less than or equal to; –, not sampled]

Year May June July August September October
All values Values ≤ 9.7 Values > 9.7 Percent > 9.7 All values Values ≤ 9.7 Values > 9.7 Percent > 9.7 All values Values ≤ 9.7 Values > 9.7 Percent > 9.7 All values Values ≤ 9.7 Values > 9.7 Percent > 9.7 All values Values ≤ 9.7 Values > 9.7 Percent > 9.7 All values Values ≤ 9.7 Values > 9.7 Percent > 9.7
1990 10 10 0 0 80 48 32 40 93 74 19 20 49 48 1 2 57 48 9 16 71 71 0 0
1991 – – – – 68 68 0 0 54 39 15 28 72 67 5 7 53 36 17 32 45 45 0 0
1992 67 67 0 0 63 30 33 52 89 87 2 2 51 51 0 0 28 27 1 4 45 45 0 0
1993 41 41 0 0 121 119 2 2 83 59 24 29 69 68 1 1 65 65 0 0 62 62 0 0
1994 81 81 0 0 73 46 27 37 47 19 28 60 54 54 0 0 49 49 0 0 34 34 0 0
1995 117 117 0 0 75 50 25 33 71 48 23 32 79 60 19 24 61 55 6 10 57 57 0 0
1996 24 24 0 0 47 44 3 6 45 40 5 11 43 38 5 12 38 38 0 0 56 53 3 5
1997 77 77 0 0 39 32 7 18 112 84 28 25 71 71 0 0 67 66 1 1 30 30 0 0
1998 43 43 0 0 127 119 8 6 71 64 7 10 73 73 0 0 71 71 0 0 70 70 0 0
1999 78 78 0 0 88 79 9 10 76 30 46 61 76 67 9 12 113 113 0 0 – – – –
2000 137 137 0 0 85 28 57 67 79 49 30 38 71 70 1 1 73 71 2 3 101 101 0 0
2001 83 83 0 0 79 63 16 20 116 75 41 35 72 71 1 1 71 71 0 0 34 34 0 0
2002 131 130 1 1 86 75 11 13 77 62 15 19 70 70 0 0 58 58 0 0 31 31 0 0
2003 45 45 0 0 86 86 0 0 118 101 17 14 71 57 14 20 66 51 15 23 27 27 0 0
2004 88 88 0 0 83 62 21 25 79 57 22 28 71 68 3 4 98 97 1 1 – – – –
2005 141 141 0 0 93 91 2 2 82 74 8 10 107 104 3 3 70 70 0 0 34 34 0 0
2006 90 90 0 0 88 82 6 7 112 103 9 8 70 45 25 36 63 22 41 65 30 30 0 0

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