Table 1. Summary of 2001 accuracy data for QC solutions.

> NOMINAL ACTUAL NET MEAN
>
> ANALYTE UNITS VALUE VALUES n BIAS %
>
> CLPH SU 4.70 4.70 0.01 67 0.07
>
> EQPH SU 4.70 4.71 0.07 158 0.13
>
> ANC µeq/L 40 40.8 1.23 73 2.04
>
> DIC mg/L C 5.00 5.00 ± 0.23 128 -0.07
>
> DOC mg/L C 5.00 4.92 ± 0.22 184 -1.66
>
> COLOR PCU 10.0 9.96 0.30 171 -0.35
>
> COND µS/cm 10 9.96 0.37 139 -0.36
>
> Ca mg/L 1.00 1.02 0.05 327 1.95
>
> Mg mg/L 1.00 1.02 0.04 327 1.58
>
> Na mg/L 1.00 1.01 0.04 327 0.64
>
> K mg/L 1.00 1.01 0.05 327 0.57
>
> Cl µeq/L 50.0 51.0 2.84 107 2.08
>
> NO3 µeq/L 25.0 25.93 1.1 105 3.73
>
> SO4 µeq/L 50.0 51.0 3.16 107 2.09
>
> Total P µg/L 50.2 49.9 1.84 96 -0.66
>
> Total N mg/L 0.559 0.550 ± 0.01 168 -1.62
>
> Si mg/L 2.00 1.97 ± 0.09 184 -1.45
>
> NH4 mg/L 0.83 0.85 ± 0.01 56 2.09
>
> Al µg/L 200.0 200.1 9.92 327 0.04

Table 2. Summary of 2001 data for field blanks.

  -------------------------- ----------- ---------------- ----------- -----
  Variable                   Median      Range            QA          n
                                                          Objective   

  pH, equilibrated           NA          NA               NA          NA

  pH, ARAS                   NA          NA               NA          NA

  ANC (µeq/L)                -1.1        -48.3 to 1.4     10          13

  Conductivity (µS/cm)       1.34        0.85 to 11.39    4           13

  DOC (mg/L)                 NA          NA               NA          NA

  DIC (mg/L)                 NA          NA               NA          NA

  Al, total dissolved (µg/L) 0.3         0 to 3.6         10          11

  Ca (mg/L)                  0.01        0 to 0.03        0.02        13

  Mg (mg/L)                  0.00        0 to 0.01        0.02        13

  Na (mg/L)                  0.01        0 to 0.03        0.02        13

  K (mg/L)                   0.01        0 to 0.03        0.02        13

  NH~4~ (mg/L)               0.02        0 to 0.02        0.05        12

  Cl (µeq/L)                 1.4         0.9 to 4.0       1.0         13

  NO~3~ (µeq/L)              0           0 to 0.3         0.2         13

  SO~4~ (µeq/L)              0.5         0 to 2.3         2.0         13

  Total P                    0           0 to 0.7         1.0         3

  Total N (mg/L)             0.001       0 to 0.024       0.050       13

  Si (mg/L)                  0           0 to 0.06        0.1         12

  Apparent Color (PCU)       0.5         0 to 1           0           10

  Chla                       NA          NA               NA          NA
  -------------------------- ----------- ---------------- ----------- -----

Table 3. Itemization of 2001 sample blank QC violations defined as two
times the MDL.

  ----------- -------- -------- --------- --------- -------- -------- -----------
  Date        K (mg/L) Na       Cl        NO~3~     DOC      Si       Total P
                       (mg/L)   (µeq/L)   (µeq/L)   (mg/L)   (mg/L)   (µg/L)

  1/2/01               0.03     2.0                 0.30              

  1/28/01                                           0.50              

  2/13/01                       1.1                 0.50              

  3/7/01                                  0.30                        

  3/8/01                                  0.40                        

  3/15/01                                                    0.18     

  4/3/01                                                     0.18     

  4/10/01                       1.3                 0.30              

  4/12/01                       1.1                                   1.3

  4/15/01                       1.1                 0.40              

  4/17/01                                                             1.3

  4/20/01                                           0.30              

  4/23/01                       1.1                                   

  4/26/01                       1.3                                   

  4/29/01                                           0.40              

  5/1/01               0.05     1.8                                   

  5/15/01                                           0.30              

  5/29/01                                 0.30                        

  6/1/01                                            0.30              

  6/12/01                                           0.30              

  6/26/01                       1.9                                   

  7/15/01                       1.8                          0.19     

  7/17/01                       2.1                                   

  7/24/01                       1.9                                   

  8/22/01     0.03              1.1                                   

  8/28/01                       1.3                                   

  9/7/01                        1.9                                   

  9/11/01                       1.1                                   

  9/18/01                       1.1                                   

  9/24/01     0.03     0.03     2.0                                   

  10/16/01    0.03              1.5                                   

  10/29/01                      1.3                                   

  11/17/01                      1.5                                   

  11/26/01                      2.2                                   

  12/3/01              0.04     2.4                 0.47              

  12/12/01                      1.9                                   

  12/26/01    0.03     0.04     2.9                 0.34              
  ----------- -------- -------- --------- --------- -------- -------- -----------

> **NOTE:** DOC values in red represent those samples filtered through a
> glass 0.7 µm filter. Values in black
>
> Represent those samples filtered through a 0.4 µm filter.

Table 4. Summary of 2001 precision data for field replicates.

  ------------------------------- -------- -------------- ----------- -----
  Variable                        Median   Range          QA          n
                                                          Objective   

  pH, closed cell (values 5.74)   0.01     -0.5 to 0.1    0.075       26

  pH, closed cell (values 5.74)   -0.01    -0.14 to 0.15  0.15        34

  pH, equilibrated (values 5.74)  -0.01    -0.26 to 0.04  0.075       15

  pH, equilibrated (values 5.74)  -0.01    -0.22 to 0.06  0.15        46

  ANC (values 100 µeq/L)          0.1      -4.2 to 4.5    5 µeq/L     53

  ANC (values 100 µeq/L)          0.37%    0 to 0.90%     5%          10

  Conductivity (values 50uS/cm)   0        -1.7 to 2.3    1 uS/cm     60

  Conductivity (values 50uS/cm)   2.23%    0.26 to 4.2%   2%          2

  DOC (values 2 mg/L)             0        -0.5 to 0.14   0.1 mg/L    19

  DOC (values 2 mg/L)             1.57%    0 to 25.4%     5%          42

  DIC (values 2 mg/L)             0        -0.3 to 0.6    0.1 mg/L    42

  DIC (values 2 mg/L)             2.77%    1.89 to 10.3%  5%          7

  Al, total dissolved (values 100 -1.7     -28.7 to 12.7  10 µg/L     34
  µg/L)                                                               

  Al, total dissolved (values 100 0.60%    0 to 12.2%     10%         22
  µg/L)                                                               

  Ca (values 0.4 mg/L)            0        0 to 0         0.02 mg/L   1

  Ca (values 0.4 mg/L)            1.02%    0 to 4.12%     5%          61

  Mg (values 0.2 mg/L)            0        0 to 0         0.01 mg/L   2

  Mg (values 0.2 mg/L)            0.18%    0 to 3.07%     5%          60

  Na (mg/L)                       1.15%    0 to 12.0%     5%          62

  K (values 0.8 mg/L)             0        -0.14 to 0.1   0.04 mg/L   57

  K (values 0.8 mg/L)             1.55%    0 to 7.04%     5%          5

  NH~4~ (mg/L)                    0        -0.03 to 0.02  0.02 mg/L   62

  Cl (values 20 µeq/L)            0.15     -1.6 to 2.4    1.0 µeq/L   6

  Cl (values 20 µeq/L)            0.68%    0 to 10.0%     5%          56

  NO~3~ (values 10 µeq/L)         0        -0.3 to 0.4    0.5 µeq/L   52

  NO~3~ (values 10 µeq/L)         0.37%    0 to 12.5%     5%          10

  SO~4~ (ueq/L)                   0.36%    0 to 106.6%    5%          62

  Total P (values 20 µg/l)        0        -5 to 3        1 µg/L      58

  Total P (values \> 20 µg/l)     6.17%    5.2 to 7.1%    5%          2

  Total N (values 0.020 mg/l)     0.001    0 to 0.001     0.001       2

  Total N (values \> 0.020 mg/l)  2.57%    0 to 41.3%     5%          59

  Si (values 1 mg/L)              0        -0.05 to 0.04  0.05 mg/L   14

  Si (values 1 mg/L)              1.72%    0 to 10.5%     5%          48

  True Color (values 50 PCU)      0        -1 to 1        5 PCU       56

  True Color (values 50 PCU)      1.09%    0.4 to 42.6%   10%         4
  ------------------------------- -------- -------------- ----------- -----

Table 5. Itemization of 2001 field replicate precision violations.

  ---------------- ------------ ------------ ---------------- ------------
  Site             Sample Date  Analyte      Duplicate Values Precision

  WB3              1-2-01       DOC          1.3, 1.5         -0.20 mg/L

  WB3              1-2-01       Total P      4.3, 2.5         1.80 µg/L

  EB8              1-16-01      EqpH         5.84, 6.06       -0.22

  EB8              1-16-01      Total P      1.8, 3.4         -1.6 µg/L

  EB8              1-16-01      Total N      0.06, 0.07       11.79%

  WB3              2-13-01      DOC          1.2, 1.7         -0.50 mg/L

  EB8              4-3-01       DIC          0.7, 0.9         -0.20 mg/L

  EB8              4-3-01       DOC          2.3, 1.6         25.38%

  EB8              4-3-01       Total P      8.6, 12.8        -4.20 µg/L

  EB8              4-3-01       Total N      0.061, 0.045     21.35%

  WB3              4-17-01      DIC          0.6, 0.4         0.20 mg/L

  WB3              4-17-01      DOC          2.1, 3.0         24.96%

  EBT-0            5-1-01       SO~4~        88.9, 12.5       106.55%

  EBT-0            5-1-01       EqpH         5.6, 5.86        -0.26

  EBT-0            5-1-01       Total P      2, 3.4           -1.40 µg/L

  EB8              5-1-01       Total N      0.064, 0.069     5.32%

  EB8              5-29-01      ClpH         5.7, 5.6         0.10

  EB8              5-29-01      DOC          1.8, 2.3         -0.50 mg/L

  EB8              5-29-01      Total N      0.079, 0.070     8.54%

  WB3              6-5-01       Total N      0.241, 0.279     10.33%

  WB3              12-26-01     DIC          0.41, 0.6        -0.19 mg/L

  WB3              12-26-01     Sp. Cond.    43.5, 41.2       2.30 µS/cm

  Sinclair         7-17-01      Total P      14, 19           -5.00 µg/L

  Sinclair         7-17-01      Color        121, 65          -42.58%

  HB1              1-2-01       Alx          42.8, 61.6       -18.80 µg/L

  HB1              1-2-01       AlOrg        54, 37.1         16.90 µg/L

  CB1              2-27-01      Al           76.9, 64.2       12.7 µg/L

  CB1              2-27-01      Alx          57.3, 44.1       13.20 µg/L

  HB1              3-13-01      K            0.18, 0.23       -0.05 mg/L

  HB1              3-13-01      NO~3~        10.8, 12.9       12.3%

  HB1              4-10-01      AlOrg        63.9, 80.1       -16.20 µg/L

  CB1              5-29-01      Al           43.5, 72.2       -28.7 µg/L

  CB1              5-29-01      Total N      0.035, 0.032     6.33%

  CB1              6-28-01      DIC          2.2, 1.9         10.35%

  CB1              6-28-01      Total N      0.063, 0.115     41.31%

  HB1              7-18-01      K            0.17, 0.31       -0.14 mg/L

  HB1              7-18-01      DOC          1.6, 1.9         -0.30 mg/L

  HB1              7-18-01      Total P      2.3, 3.4         -1.10 µg/L

  HB1              7-18-01      Total N      0.239, 0.385     33.09%

  HB1              10-19-01     Alx          22.5, 43.8       -21.3 µg/L

  HB1              10-19-01     AlOrg        57.3, 38.5       18.80 µg/L

  CB1              11-17-01     K            0.18, 0.11       0.07 mg/L

  CB1              11-17-01     ClpH         5.72, 6.22       -0.50

  CB1              11-17-01     DIC          1.75, 1.64       0.11 mg/L

  CB1              11-17-01     DOC          0.95, 0.81       0.14 mg/L

  CB1              11-17-01     Total N      0.078, 0.05      30.94%

  CB1              12-12-01     Total N      0.032, 0.038     12.12%

  Loon             9-29-01      Total P      9.3, 12          -2.7 µg/L

  PINEO            10-21-01     Cl           66.9, 61         6.52%

  PINEO            10-21-01     DOC          4.93, 4.4        8.03%

  Gould            10-28-01     K            1.05, 1.16       7.04%

  Gould            10-28-01     DOC          4.01, 4.49       7.99%

  Gould            10-28-01     Total P      14, 11           3.0 µg/L

  Rocky            10-31-01     Total P      5.1, 3.9         1.2 µg/L

  Bracey           11-14-01     Total P      7, 8.2           -1.2 µg/L

  LARDP            11-17-01     DOC          3.03, 3.37       7.51%

  ROUNL            11-18-01     Na           1.08, 1.28       11.98%

  Wiley            3-8-01       Na           0.99, 1.07       5.49%

  Wiley            3-8-01       K            0.24, 0.29       -0.1 mg/L

  Wiley            3-8-01       Cl           20.3, 23.4       10.03%

  Mud O            3-15-01      EqpH         4.77, 4.83       -0.1

  Newbert O        3-28-01      Alx          5, 17            -12.0 µg/L

  Newbert O        3-28-01      Sp. Cond.    51.78, 54.95     4.20 µS/cm

  Jellison         4-12-01      K            0.25, 0.35       -0.1 mg/L

  Abol             4-19-01      Cl           14.9, 16.5       -1.6 µeq/L

  Second           5-8-01       Total P      5.9, 8           -2.1 µg/L

  Second           5-8-01       Sp. Cond.    22.23, 23.9      -1.7 µS/cm

  Bean O           5-7-01       ClpH         5.96, 5.81       0.2

  Bean O           5-7-01       DIC          2, 1.4           0.6 mg/L

  Abol             5-16-01      Total P      21.7, 19.7       7.11%

  Salmon E         7-25-01      Total P      7.9, 5.8         2.1 µg/L

  Abol E           7-31-01      DOC          2.8, 2.6         5.24%

  Abol E           7-31-01      Total P      6.6, 4.2         2.4 µg/L

  Crystal E        8-4-01       ClpH         5.46, 5.37       0.1

  Crystal E        8-4-01       Total P      8.3, 6.6         1.7 µg/L

  Bean E           8-7-01       Cl           13.7, 11.3       2.4 µeq/L

  Bean E           8-7-01       DIC          0.6, 0.9         -0.3 mg/L

  Bracey           10-16-01     DIC          1.8, 1.6         0.2 mg/L

  Bracey           10-16-01     Si           0.57, 0.62       -0.1 mg/L

  Partridge        10-16-01     Cl           44, 40.1         6.56%

  Partridge        10-16-01     DIC          0.86, 0.66       0.2 µg/L

  Partridge        10-16-01     DOC          2.74, 2.39       9.65%

  Wizard           10-16-01     Total P      6.1, 9.1         -3.0 µg/L

  Russell Pond     7-25-01      Total P      2.4, 4.3         -1.9 µg/L

  Scokes           8-21-01      Total P      42, 39           5.24%

  Somers           8-22-01      Al           52.1, 63.1       -11.0 µg/L

  Somers           8-22-01      Cl           40.3, 36.9       6.23 µeq/L

  Somers           8-22-01      Si           1.74, 1.5        10.48%
  ---------------- ------------ ------------ ---------------- ------------

Table 6. Summary of 2001 precision data for laboratory duplicates.

  ------------------------------- -------- -------------- ----------- -----
  Variable                        Median   Range          QA          n
                                                          Objective   

  pH, closed cell (values 5.74)   -0.01    -0.06 to 0.21  0.075       21

  pH, closed cell (values 5.74)   0.01     -0.08 to 1.00  0.15        11

  pH, equilibrated (values 5.74)  0        -0.12 to 0.03  0.075       33

  pH, equilibrated (values 5.74)  -0.01    -0.06 to 0.03  0.15        18

  ANC (values 100 µeq/L)          0.15     -1.9 to 2.00   5 µeq/L     32

  ANC (values 100 µeq/L)          0.53%    0.36 to 0.70%  5%          2

  Conductivity (values 50uS/cm)   -0.10    -0.84 to 1.14  1 uS/cm     50

  Conductivity (values 50uS/cm)   0.79%    0.79 to 0.79%  2%          1

  DOC (values 2 mg/L)             0.01     -0.02 to 0.02  0.1 mg/L    9

  DOC (values 2 mg/L)             0.52%    0 to 6.75%     5%          26

  DIC (values 2 mg/L)             0        -0.05 to 0.06  0.1 mg/L    17

  DIC (values 2 mg/L)             0.95%    0 to 1.9%      5%          2

  Al, total dissolved (values 100 0.1      -2.5 to 3.8    10 µg/L     17
  µg/L)                                                               

  Al, total dissolved (values 100 0.56%    0 to 1.74%     10%         18
  µg/L)                                                               

  Ca (values 0.4 mg/L)            0        -0.01 to 0     0.02 mg/L   14

  Ca (values 0.4 mg/L)            1.24%    0 to 6.72%     5%          35

  Mg (values 0.2 mg/L)            0        0 to 0         0.01 mg/L   2

  Mg (values 0.2 mg/L)            0%       0 to 6.64%     5%          36

  Na (values 0.46 mg/L)           0        -0.01 to 0.01  0.02        13

  Na (values 0.46 mg/L)           0.88%    0 to 3.85%     5%          41

  K (values 0.8 mg/L)             0        -0.01 to 0.03  0.04 mg/L   45

  K (values 0.8 mg/L)             0.86%    0.86 to 0.86%  5%          1

  NH~4~ (values 0.36 mg/L)        0        -0.07 to 0.18  0.02 mg/L   90

  NH~4~ (values \> 0.36 mg/L)     1.63%    0 to 3.79%     5%          6

  Cl (values 20 µeq/L)            0        -0.34 to 0.29  1.0 µeq/L   16

  Cl (values 20 µeq/L)            0.48%    0.02 to 5.64%  5%          25

  NO~3~ (values 10 µeq/L)         0        -0.14 to 0.19  0.5 µeq/L   31

  NO~3~ (values 10 µeq/L)         0.31%    0 to 1.39%     5%          10

  SO~4~ (values 20 µeq/L)         0.08     -0.17 to 0.34  1.0 µeq/L   6

  SO~4~ (values 20 µeq/L)         0.16%    0.01 to 1.81%  5%          35

  Total P (values 20 µg/l)        0        -1.50 to 0.60  1 µg/L      11

  Total P (values \> 20 µg/l)     3.4%     2.16 to 14.45% 5%          3

  Total N (mg/l)                  1.24%    0 to 13.47%    5%          77

  Si (values 1 mg/L)              0        -0.07 to 0.15  0.05 mg/L   59

  Si (values 1 mg/L)              0.64%    0 to 21.9%     5%          43

  True Color (values 50 PCU)      0        -1.00 to 1.00  5 PCU       45

  True Color (values 50 PCU)      0%       0 to 0%        10%         1
  ------------------------------- -------- -------------- ----------- -----