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STATISTICS for MEXICO

STATISTICS FOR MEXICO


GEMS/WATER - STATISTICAL SUMMARY BY STATION     2002-02-15   PAGE 366

 STATION - RIO COLORADO                             STATION NO. 037001
 COUNTRY - MEXICO                                   DEPTH(M)       4.0
 LOCATION - OCT. 1  LAT. 32/42/00  LONG. 114/43/00  ELEVATION(M)9999.9
 REGIONAL CENTRE - AMRA                             WATER TYPE   RIVER      

 PERIOD REQUESTED FROM  - 1982-01-01 TO 1984-12-31
 PERIOD OF RECORD FROM  - 1982-03-31 TO 1983-12-06

 STATISTICS INCLUDE ALL FLAGGED DATA AS REPORTED


                             ELEC       TEMP       TEMP     N KJEL        NH3
                             COND                                            
                            02041      02061      02062      07004      07554
                            us/cm      deg C      deg C     mg/L N     mg/L N


 NO. OF L-FLAGGED VALUES        0          0          4          0          3
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       21         21         14         21          2
 MEAN                       1699.       19.3        0.1        1.0       0.22
 MINIMUM                    1272.       10.0        0.0        0.4       0.05
 DATE OF MINIMUM       1983-07-13 1983-12-06 1982-03-31 1983-12-06 1982-05-18
 10TH PERCENTILE            1295.       10.8        0.0        0.6           
 MEDIAN                     1500.       19.5        0.1        1.0       0.05
 90TH PERCENTILE            1939.       25.0        0.2        1.4           
 MAXIMUM                    5107.       28.0        0.2        1.4       0.50
 DATE OF MAXIMUM       1982-08-10 1982-08-10 1983-06-08 1982-06-29 1982-04-20
 STANDARD DEVIATION          814.        5.1        0.1        0.3       0.24




                               O2        BOD        COD        ALK         pH
                             DISS                            TOTAL           
                            08101      08201      08301      10102      10302
                          mg/L O2    mg/L O2    mg/L O2       mg/L   pH UNITS


 NO. OF L-FLAGGED VALUES        0          0          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       21         21         21         21         21
 MEAN                         8.1         5.        44.     163.81        7.8
 MINIMUM                      5.9         1.         9.     140.00        7.4
 DATE OF MINIMUM       1983-09-13 1982-08-10 1982-04-20 1982-03-31 1982-07-27
 10TH PERCENTILE              6.0         1.        27.     140.00        7.6
 MEDIAN                       8.3         4.        37.     160.00        7.8
 90TH PERCENTILE              9.5        11.        70.     180.00        8.0
 MAXIMUM                     11.3        19.        88.     290.00        8.1
 DATE OF MAXIMUM       1983-11-08 1983-02-01 1982-06-29 1982-08-10 1982-12-14
 STANDARD DEVIATION           1.5         5.        19.      32.32        0.2




                         SUSP SOL         Mg      PO4-P        PO4         Cl
                          105 DEG       DISS        SOL      TOTAL       DISS
                            10401      12102      15254      15403      17203
                             mg/L    mg/L Mg   mg/L PO4   mg/L PO4    mg/L Cl


 NO. OF L-FLAGGED VALUES        0          0         14          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       21         11          2         17         21
 MEAN                         37.       158.      0.049      0.211       195.
 MINIMUM                       9.       100.      0.020      0.090       113.
 DATE OF MINIMUM       1983-09-13 1983-07-13 1982-03-31 1982-03-31 1983-08-16
 10TH PERCENTILE              13.       102.      0.020      0.090       114.
 MEDIAN                       32.       160.      0.020      0.200       156.
 90TH PERCENTILE              50.       189.      0.056      0.315       207.
 MAXIMUM                     104.       190.      0.390      0.550       918.
 DATE OF MAXIMUM       1983-08-16 1983-12-06 1983-05-10 1983-05-10 1982-08-10
 STANDARD DEVIATION           24.        30.      0.094      0.118       169.




                               Ca   FAEC COL       FAEC
                             DISS                 STREP
                            20103      36011      36101
                          mg/L Ca   No/100ml   No/100ml


 NO. OF L-FLAGGED VALUES        0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0
 NO. OF UNFLAGGED VALUES       17         20          3
 MEAN                     171.059       344.        36.
 MINIMUM                   76.000         9.           
 DATE OF MINIMUM       1983-10-11 1983-09-13           
 10TH PERCENTILE           76.000        15.           
 MEDIAN                   200.000       122.           
 90TH PERCENTILE          243.000       460.           
 MAXIMUM                  300.000      2400.           
 DATE OF MAXIMUM       1982-08-10 1983-04-12           
 STANDARD DEVIATION        75.948       548.           





 STATION - RIO CONCHOS                              STATION NO. 037002
 COUNTRY - MEXICO                                   DEPTH(M)       1.1
 LOCATION - OCT. 1  LAT. 29/34/00  LONG. 104/26/00  ELEVATION(M)1210.0
 REGIONAL CENTRE - AMRA                             WATER TYPE   RIVER      

 PERIOD REQUESTED FROM  - 1982-01-01 TO 1984-12-31
 PERIOD OF RECORD FROM  - 1982-01-20 TO 1984-03-06

 STATISTICS INCLUDE ALL FLAGGED DATA AS REPORTED


                             ELEC       TEMP       TEMP     N KJEL        NH3
                             COND                                            
                            02041      02061      02062      07004      07554
                            us/cm      deg C      deg C     mg/L N     mg/L N


 NO. OF L-FLAGGED VALUES        0          0          2          0          4
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       19         21          2          8          0
 MEAN                       1168.       20.7        0.1        0.3       0.05
 MINIMUM                     820.       15.0        0.0        0.2       0.05
 DATE OF MINIMUM       1983-08-17 1982-02-17 1982-04-26 1982-04-26 1982-01-20
 10TH PERCENTILE             823.       15.0                                 
 MEDIAN                     1150.       20.6        0.0        0.3       0.05
 90TH PERCENTILE            1302.       26.0                                 
 MAXIMUM                    1500.       36.0        0.5        0.4       0.05
 DATE OF MAXIMUM       1983-05-13 1982-07-06 1982-01-20 1982-05-13 1982-05-13
 STANDARD DEVIATION          156.        5.2        0.2        0.1       0.00




                               O2        BOD        COD        ALK         pH
                             DISS                            TOTAL           
                            08101      08201      08301      10102      10302
                          mg/L O2    mg/L O2    mg/L O2       mg/L   pH UNITS


 NO. OF L-FLAGGED VALUES        0          0          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       20         10         10         21         21
 MEAN                         7.7         3.        25.     253.81        7.7
 MINIMUM                      5.6         1.         5.     204.00        6.0
 DATE OF MINIMUM       1983-07-28 1982-10-13 1982-11-14 1983-08-17 1984-03-06
 10TH PERCENTILE              6.5         1.         5.     220.50        6.5
 MEDIAN                       7.8         2.        25.     256.00        8.0
 90TH PERCENTILE              8.3         3.        37.     277.20        8.2
 MAXIMUM                      9.7        10.        52.     309.00        8.3
 DATE OF MAXIMUM       1982-10-13 1982-05-13 1982-07-06 1983-06-15 1983-10-17
 STANDARD DEVIATION           0.8         3.        14.      22.82        0.6




                         SUSP SOL   SUSP SOL         Mg      PO4-P        PO4
                          105 DEG    180 DEG       DISS        SOL      TOTAL
                            10401      10408      12102      15254      15403
                             mg/L       mg/L    mg/L Mg   mg/L PO4   mg/L PO4


 NO. OF L-FLAGGED VALUES        0          0          0          1          2
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       19         13          3          8         11
 MEAN                         45.        12.       105.      0.098      0.148
 MINIMUM                      10.         2.                 0.020      0.020
 DATE OF MINIMUM       1984-01-09 1983-11-30            1982-04-26 1983-11-30
 10TH PERCENTILE              14.         2.                            0.020
 MEDIAN                       33.         6.                 0.060      0.140
 90TH PERCENTILE              57.        11.                            0.242
 MAXIMUM                     225.        75.                 0.230      0.270
 DATE OF MAXIMUM       1983-08-17 1983-08-17            1982-01-20 1982-04-26
 STANDARD DEVIATION           46.        19.                 0.078      0.080




                         SULPHATE         Cl         Cl         Ca   FAEC COL
                                        DISS       DISS       DISS           
                            16302      17201      17203      20103      36011
                         mg/L SO4    mg/L Cl    mg/L Cl    mg/L Ca   No/100ml


 NO. OF L-FLAGGED VALUES        0          0          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES        3          3         16         11          8
 MEAN                        154.        36.        39.     95.327     14500.
 MINIMUM                                            28.     65.600       200.
 DATE OF MINIMUM                             1984-02-14 1984-03-06 1982-11-14
 10TH PERCENTILE                                    31.     66.980           
 MEDIAN                                             39.     96.400      2200.
 90TH PERCENTILE                                    46.    115.700           
 MAXIMUM                                            58.    120.000    100000.
 DATE OF MAXIMUM                             1984-01-09 1982-12-15 1982-05-13
 STANDARD DEVIATION                                  7.     16.209     34609.




                             FAEC
                            STREP
                            36101
                         No/100ml


 NO. OF L-FLAGGED VALUES        0
 NO. OF G-FLAGGED VALUES        0
 NO. OF UNFLAGGED VALUES        6
 MEAN                      16963.
 MINIMUM                       7.
 DATE OF MINIMUM       1982-01-20
 10TH PERCENTILE                 
 MEDIAN                      420.
 90TH PERCENTILE                 
 MAXIMUM                  100000.
 DATE OF MAXIMUM       1982-05-13
 STANDARD DEVIATION        40682.





 STATION - RIO BRAVO                                STATION NO. 037003
 COUNTRY - MEXICO                                   DEPTH(M)       3.0
 LOCATION - OCT. 1  LAT. 25/53/00  LONG. 097/30/30  ELEVATION(M)   1.5
 REGIONAL CENTRE - AMRA                             WATER TYPE   RIVER      

 PERIOD REQUESTED FROM  - 1982-01-01 TO 1984-12-31
 PERIOD OF RECORD FROM  - 1982-02-08 TO 1984-01-03

 STATISTICS INCLUDE ALL FLAGGED DATA AS REPORTED


                             ELEC       TEMP         O2        BOD        COD
                             COND                  DISS                      
                            02041      02061      08101      08201      08301
                            us/cm      deg C    mg/L O2    mg/L O2    mg/L O2


 NO. OF L-FLAGGED VALUES        0          0          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       13         15         16         11         12
 MEAN                        823.       24.7        8.7         3.        25.
 MINIMUM                       8.       12.0        6.8         1.         9.
 DATE OF MINIMUM       1982-02-08 1984-01-03 1982-06-10 1983-10-25 1982-06-10
 10TH PERCENTILE              46.       13.0        7.0         1.         9.
 MEDIAN                      900.       26.0        8.5         3.        22.
 90TH PERCENTILE            1184.       30.0       10.4         5.        43.
 MAXIMUM                    1300.       32.0       13.0        10.        48.
 DATE OF MAXIMUM       1983-10-25 1983-08-22 1984-01-03 1982-02-25 1982-10-13
 STANDARD DEVIATION          388.        5.7        1.6         3.        14.




                              ALK         pH   SUSP SOL   SUSP SOL        PO4
                            TOTAL               105 DEG    180 DEG      TOTAL
                            10102      10302      10401      10408      15403
                             mg/L   pH UNITS       mg/L       mg/L   mg/L PO4


 NO. OF L-FLAGGED VALUES        0          0          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       15         12         15         12          6
 MEAN                      151.80        8.1       131.        26.      1.847
 MINIMUM                    77.00        7.6         4.         2.      0.020
 DATE OF MINIMUM       1983-07-28 1982-02-25 1983-05-05 1983-05-05 1982-02-25
 10TH PERCENTILE            95.00        7.7        12.         2.           
 MEDIAN                    154.00        8.0        56.        19.      0.440
 90TH PERCENTILE           198.50        8.3       346.        58.           
 MAXIMUM                   220.00        8.6       484.        74.      7.900
 DATE OF MAXIMUM       1982-07-06 1983-11-15 1983-09-26 1983-10-25 1982-07-06
 STANDARD DEVIATION         38.23        0.2       154.        24.      3.056




                         SULPHATE         Cl         Cl
                                        DISS       DISS
                            16302      17201      17203
                         mg/L SO4    mg/L Cl    mg/L Cl


 NO. OF L-FLAGGED VALUES        0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0
 NO. OF UNFLAGGED VALUES        4          5         10
 MEAN                        321.       216.       158.
 MINIMUM                     230.       153.       116.
 DATE OF MINIMUM       1983-09-26 1983-11-15 1982-04-19
 10TH PERCENTILE                                   116.
 MEDIAN                      300.       222.       160.
 90TH PERCENTILE                                   200.
 MAXIMUM                     454.       252.       205.
 DATE OF MAXIMUM       1983-10-25 1983-08-22 1982-05-11
 STANDARD DEVIATION           98.        38.        32.





 STATION - RIO PANUCO                               STATION NO. 037004
 COUNTRY - MEXICO                                   DEPTH(M)      10.0
 LOCATION - OCT. 1  LAT. 23/03/00  LONG. 098/18/30  ELEVATION(M)  12.0
 REGIONAL CENTRE - AMRA                             WATER TYPE   RIVER      

 PERIOD REQUESTED FROM  - 1982-01-01 TO 1984-12-31
 PERIOD OF RECORD FROM  - 1982-01-25 TO 1984-03-07

 STATISTICS INCLUDE ALL FLAGGED DATA AS REPORTED


                             ELEC       TEMP       TEMP     N KJEL     NO3NO2
                             COND                                            
                            02041      02061      02062      07004      07105
                            us/cm      deg C      deg C     mg/L N     mg/L N


 NO. OF L-FLAGGED VALUES        0          0         10          2          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       19         25          8         23          4
 MEAN                        852.       26.9        0.0        0.3       0.32
 MINIMUM                     404.       20.0        0.0        0.1       0.10
 DATE OF MINIMUM       1983-08-04 1984-02-08 1982-03-11 1982-08-10 1984-01-10
 10TH PERCENTILE             503.       21.0        0.0        0.1           
 MEDIAN                      927.       28.0        0.0        0.2       0.32
 90TH PERCENTILE            1045.       31.5        0.1        0.4           
 MAXIMUM                    1049.       37.5        0.2        0.8       0.56
 DATE OF MAXIMUM       1982-09-08 1982-05-12 1983-09-07 1983-11-07 1984-02-08
 STANDARD DEVIATION          203.        4.4        0.0        0.2       0.21




                              NH3         O2        BOD        COD        ALK
                                        DISS                            TOTAL
                            07554      08101      08201      08301      10102
                           mg/L N    mg/L O2    mg/L O2    mg/L O2       mg/L


 NO. OF L-FLAGGED VALUES       18          0          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES        7         25         25         24         25
 MEAN                        0.08        8.5         2.        16.     174.08
 MINIMUM                     0.02        6.7         0.         3.     137.00
 DATE OF MINIMUM       1982-10-06 1983-07-13 1982-07-12 1982-09-08 1982-10-06
 10TH PERCENTILE             0.02        7.1         1.         3.     156.00
 MEDIAN                      0.05        8.4         1.        10.     172.00
 90TH PERCENTILE             0.15        9.8         2.        25.     201.50
 MAXIMUM                     0.48       10.2         4.        61.     215.00
 DATE OF MAXIMUM       1983-02-02 1983-03-02 1983-08-04 1983-08-04 1982-02-15
 STANDARD DEVIATION          0.09        1.0         1.        15.      19.13




                               pH   SUSP SOL   SUSP SOL         Na         Mg
                                     105 DEG    180 DEG       DISS       DISS
                            10302      10401      10408      11103      12102
                         pH UNITS       mg/L       mg/L    mg/L Na    mg/L Mg


 NO. OF L-FLAGGED VALUES        0          0          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       25         22         22          9         15
 MEAN                         8.1        55.        21.        27.        25.
 MINIMUM                      7.9         5.         4.        14.        10.
 DATE OF MINIMUM       1982-07-12 1984-01-10 1984-01-10 1982-10-06 1983-08-04
 10TH PERCENTILE              7.9        10.         5.                   11.
 MEDIAN                       8.1        36.        12.        27.        24.
 90TH PERCENTILE              8.3       109.        48.                   37.
 MAXIMUM                      8.4       288.        81.        36.        37.
 DATE OF MAXIMUM       1984-02-08 1983-02-02 1983-02-02 1983-02-02 1983-04-06
 STANDARD DEVIATION           0.1        69.        20.         8.         9.




                            PO4-P        PO4   SULPHATE         Cl         Cl
                              SOL      TOTAL                  DISS       DISS
                            15254      15403      16302      17201      17203
                         mg/L PO4   mg/L PO4   mg/L SO4    mg/L Cl    mg/L Cl


 NO. OF L-FLAGGED VALUES       14          7          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES        5          6          7          7         18
 MEAN                       0.024      0.029       225.        29.        26.
 MINIMUM                    0.020      0.020       110.        17.         8.
 DATE OF MINIMUM       1982-02-15 1982-02-15 1983-11-07 1982-10-06 1983-08-04
 10TH PERCENTILE            0.020      0.020                              11.
 MEDIAN                     0.020      0.020       254.        31.        27.
 90TH PERCENTILE            0.040      0.057                              35.
 MAXIMUM                    0.040      0.060       314.        40.        47.
 DATE OF MAXIMUM       1983-07-13 1982-06-08 1983-03-02 1983-02-02 1983-04-06
 STANDARD DEVIATION         0.008      0.016        76.         9.        10.




                                K         Ca         Ca   FAEC COL       INST
                             DISS       DISS       DISS                DISCHG
                            19103      20101      20103      36011      97160
                           mg/L K    mg/L Ca    mg/L Ca   No/100ml       m3/S


 NO. OF L-FLAGGED VALUES        0          0          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES        9          6         18         25         19
 MEAN                         3.3    113.833    106.900       161.      174.3
 MINIMUM                      2.2     71.000     15.200         8.       34.0
 DATE OF MINIMUM       1984-01-10 1982-10-06 1984-02-08 1982-10-06 1983-05-11
 10TH PERCENTILE                                 43.680        10.       49.8
 MEDIAN                       3.5    122.500    124.500        33.      136.0
 90TH PERCENTILE                                137.500       290.      363.3
 MAXIMUM                      4.6    129.000    142.000      1600.      595.0
 DATE OF MAXIMUM       1983-02-02 1983-01-10 1982-09-08 1983-07-13 1983-08-04
 STANDARD DEVIATION           1.0     22.230     36.945       340.      144.9





 STATION - RIO COATZACOALCOS                        STATION NO. 037005
 COUNTRY - MEXICO                                   DEPTH(M)      10.0
 LOCATION - OCT. 1  LAT. 18/06/30  LONG. 094/25/00  ELEVATION(M)   1.1
 REGIONAL CENTRE - AMRA                             WATER TYPE   RIVER      

 PERIOD REQUESTED FROM  - 1982-01-01 TO 1984-12-31
 PERIOD OF RECORD FROM  - 1982-02-01 TO 1983-12-06

 STATISTICS INCLUDE ALL FLAGGED DATA AS REPORTED


                             ELEC       TEMP       TEMP     N KJEL     NO3NO2
                             COND                                            
                            02041      02061      02062      07004      07105
                            us/cm      deg C      deg C     mg/L N     mg/L N


 NO. OF L-FLAGGED VALUES        0          0          2          2          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       10         16          8         11          2
 MEAN                      10176.       26.7        0.2        0.5       0.06
 MINIMUM                     171.       21.0        0.0        0.1           
 DATE OF MINIMUM       1983-07-08 1982-02-01 1982-08-24 1983-02-08           
 10TH PERCENTILE             171.       21.6        0.0        0.1           
 MEDIAN                     7327.       27.0        0.1        0.5           
 90TH PERCENTILE           17917.       30.0        0.4        0.9           
 MAXIMUM                   29370.       30.0        0.5        1.1           
 DATE OF MAXIMUM       1983-02-08 1982-06-15 1983-03-07 1982-04-12           
 STANDARD DEVIATION         9815.        3.0        0.2        0.3           




                              NH3         O2        BOD        COD        ALK
                                        DISS                            TOTAL
                            07554      08101      08201      08301      10102
                           mg/L N    mg/L O2    mg/L O2    mg/L O2       mg/L


 NO. OF L-FLAGGED VALUES        7          0          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES        8         16          9         16         16
 MEAN                        0.35        8.3         2.       135.      97.31
 MINIMUM                     0.05        6.0         0.        12.      58.00
 DATE OF MINIMUM       1982-03-05 1983-11-15 1982-12-07 1983-12-06 1983-07-08
 10TH PERCENTILE             0.05        6.1                   13.      60.40
 MEDIAN                      0.05        7.9         1.        71.      77.50
 90TH PERCENTILE             1.15       10.8                  239.     134.00
 MAXIMUM                     1.73       14.2         8.       919.     288.00
 DATE OF MAXIMUM       1983-01-13 1982-05-11 1982-02-01 1983-07-08 1982-06-15
 STANDARD DEVIATION          0.57        2.4         3.       223.      56.82




                               pH   SUSP SOL   SUSP SOL      PO4-P        PO4
                                     105 DEG    180 DEG        SOL      TOTAL
                            10302      10401      10408      15254      15403
                         pH UNITS       mg/L       mg/L   mg/L PO4   mg/L PO4


 NO. OF L-FLAGGED VALUES        0          0          0          1          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       16         16         14         15         16
 MEAN                         6.7        64.        19.      0.140      0.304
 MINIMUM                      6.0         3.         1.      0.020      0.030
 DATE OF MINIMUM       1982-03-05 1982-04-12 1982-04-12 1982-03-05 1982-06-15
 10TH PERCENTILE              6.0         4.         1.      0.020      0.042
 MEDIAN                       7.0        35.        16.      0.065      0.170
 90TH PERCENTILE              7.0       100.        27.      0.236      0.482
 MAXIMUM                      7.6       420.        64.      0.840      1.810
 DATE OF MAXIMUM       1982-02-01 1982-02-01 1982-08-24 1983-02-08 1983-02-08
 STANDARD DEVIATION           0.5       102.        16.      0.203      0.429




                         SULPHATE         Cl         Cl   FAEC COL       FAEC
                                        DISS       DISS                 STREP
                            16302      17201      17203      36011      36101
                         mg/L SO4    mg/L Cl    mg/L Cl   No/100ml   No/100ml


 NO. OF L-FLAGGED VALUES        0          0          0          1          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES        2          2         13         13          1
 MEAN                         63.       732.      3731.       110.        20.
 MINIMUM                                           138.         3.           
 DATE OF MINIMUM                             1982-08-24 1982-03-05           
 10TH PERCENTILE                                   139.         3.           
 MEDIAN                                           3962.        18.           
 90TH PERCENTILE                                  6078.       220.           
 MAXIMUM                                         11396.       900.           
 DATE OF MAXIMUM                             1983-02-08 1982-04-12           
 STANDARD DEVIATION                               3286.       240.           





 STATION - RIO BALSAS                               STATION NO. 037006
 COUNTRY - MEXICO                                   DEPTH(M)       0.9
 LOCATION - OCT. 1  LAT. 17/56/30  LONG. 099/35/30  ELEVATION(M) 499.1
 REGIONAL CENTRE - AMRA                             WATER TYPE   RIVER      

 PERIOD REQUESTED FROM  - 1982-01-01 TO 1984-12-31
 PERIOD OF RECORD FROM  - 1982-01-26 TO 1983-09-29

 STATISTICS INCLUDE ALL FLAGGED DATA AS REPORTED


                             ELEC       TEMP       TEMP        NH3         O2
                             COND                                        DISS
                            02041      02061      02062      07554      08101
                            us/cm      deg C      deg C     mg/L N    mg/L O2


 NO. OF L-FLAGGED VALUES        0          0          0          2          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES        1          5          5         11         15
 MEAN                       1160.       29.1        0.2       0.59        7.3
 MINIMUM                                28.0        0.1       0.05        2.8
 DATE OF MINIMUM                  1983-03-21 1982-09-22 1982-02-23 1983-08-11
 10TH PERCENTILE                                              0.05        3.9
 MEDIAN                                 29.0        0.2       0.30        8.0
 90TH PERCENTILE                                              1.00        9.5
 MAXIMUM                                30.0        0.2       2.70        9.9
 DATE OF MAXIMUM                  1983-08-11 1982-08-24 1982-01-26 1983-05-02
 STANDARD DEVIATION                      0.9        0.1       0.74        2.1




                              BOD        COD        ALK         pH   SUSP SOL
                                                  TOTAL               105 DEG
                            08201      08301      10102      10302      10401
                          mg/L O2    mg/L O2       mg/L   pH UNITS       mg/L


 NO. OF L-FLAGGED VALUES        0          0          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       11         12         15         15         12
 MEAN                          1.       214.     150.27        8.0      3221.
 MINIMUM                       0.         6.      99.00        6.7        10.
 DATE OF MINIMUM       1982-01-26 1982-03-30 1983-07-11 1983-02-28 1983-05-02
 10TH PERCENTILE               0.         7.      99.50        7.2        11.
 MEDIAN                        1.        42.     160.00        8.1      1174.
 90TH PERCENTILE               3.       600.     184.50        8.3      8966.
 MAXIMUM                       3.       792.     189.00        8.4     11850.
 DATE OF MAXIMUM       1982-09-22 1982-05-25 1982-01-26 1982-03-30 1983-08-11
 STANDARD DEVIATION            1.       285.      32.20        0.4      4174.




                         SUSP SOL      PO4-P        PO4   SULPHATE         Cl
                          180 DEG        SOL      TOTAL                  DISS
                            10408      15254      15403      16302      17203
                             mg/L   mg/L PO4   mg/L PO4   mg/L SO4    mg/L Cl


 NO. OF L-FLAGGED VALUES        0          0          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       11         12         12          1         15
 MEAN                        359.      0.070      0.697        40.        79.
 MINIMUM                       4.      0.050      0.130                   18.
 DATE OF MINIMUM       1983-05-02 1983-05-02 1983-05-02            1983-09-29
 10TH PERCENTILE               4.      0.052      0.132                   18.
 MEDIAN                      100.      0.070      0.655                   23.
 90TH PERCENTILE             993.      0.080      1.294                   29.
 MAXIMUM                    1280.      0.100      1.400                  859.
 DATE OF MAXIMUM       1982-05-25 1983-08-11 1983-07-11            1983-08-11
 STANDARD DEVIATION          452.      0.013      0.543                  216.




                         FAEC COL       FAEC
                                       STREP
                            36011      36101
                         No/100ml   No/100ml


 NO. OF L-FLAGGED VALUES        0          0
 NO. OF G-FLAGGED VALUES        0          0
 NO. OF UNFLAGGED VALUES       15         11
 MEAN                     4.0E+04    1.6E+04
 MINIMUM                  9.0E+01    2.3E+02
 DATE OF MINIMUM       1982-01-26 1982-02-23
 10TH PERCENTILE          2.0E+02    2.5E+02
 MEDIAN                   4.6E+03    1.5E+03
 90TH PERCENTILE          1.4E+05    2.4E+04
 MAXIMUM                  2.4E+05    1.1E+05
 DATE OF MAXIMUM       1983-07-11 1982-09-22
 STANDARD DEVIATION       8.2E+04    3.3E+04





 STATION - RIO ATOYAC                               STATION NO. 037007
 COUNTRY - MEXICO                                   DEPTH(M)      12.0
 LOCATION - OCT. 1  LAT. 18/55/30  LONG. 098/16/30  ELEVATION(M)2100.0
 REGIONAL CENTRE - AMRA                             WATER TYPE   RIVER      

 PERIOD REQUESTED FROM  - 1982-01-01 TO 1984-12-31
 PERIOD OF RECORD FROM  - 1982-01-07 TO 1983-12-09

 STATISTICS INCLUDE ALL FLAGGED DATA AS REPORTED


                             TEMP     N KJEL     NO3NO2        NH3         O2
                                                                         DISS
                            02061      07004      07105      07554      08101
                            deg C     mg/L N     mg/L N     mg/L N    mg/L O2


 NO. OF L-FLAGGED VALUES        0          0          0          0          1
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       20         20          4         23         18
 MEAN                        19.0        4.9       0.54       5.13        4.0
 MINIMUM                     10.0        0.7       0.09       0.20        0.1
 DATE OF MINIMUM       1983-01-19 1982-06-29 1983-12-09 1982-06-29 1982-04-01
 10TH PERCENTILE             13.0        0.8                  1.53        0.7
 MEDIAN                      19.0        3.5       0.52       4.30        4.6
 90TH PERCENTILE             23.0        8.6                 10.72        6.1
 MAXIMUM                     26.0       13.5       1.03      12.50        6.9
 DATE OF MAXIMUM       1983-05-06 1983-04-06 1983-09-26 1983-04-06 1983-07-14
 STANDARD DEVIATION           4.0        3.8       0.41       3.60        2.2




                              BOD        COD         pH   SUSP SOL   SUSP SOL
                                                           105 DEG    180 DEG
                            08201      08301      10302      10401      10408
                          mg/L O2    mg/L O2   pH UNITS       mg/L       mg/L


 NO. OF L-FLAGGED VALUES        0          0          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       21         23         22         20         16
 MEAN                         55.       183.        7.7      1175.       170.
 MINIMUM                       1.        35.        7.3        40.         8.
 DATE OF MINIMUM       1983-06-02 1983-09-26 1983-07-14 1983-06-02 1983-02-17
 10TH PERCENTILE               8.        42.        7.4        92.        13.
 MEDIAN                       40.       122.        7.7       298.        70.
 90TH PERCENTILE              82.       252.        7.8      2572.       290.
 MAXIMUM                     340.       916.        7.9     10740.      1080.
 DATE OF MAXIMUM       1983-04-06 1983-07-14 1983-09-26 1983-07-14 1983-07-14
 STANDARD DEVIATION           72.       207.        0.2      2500.       262.




                            PO4-P        PO4   FAEC COL       INST
                              SOL      TOTAL                DISCHG
                            15254      15403      36011      97160
                         mg/L PO4   mg/L PO4   No/100ml       m3/S


 NO. OF L-FLAGGED VALUES        0          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          6          0
 NO. OF UNFLAGGED VALUES       23         20         12          9
 MEAN                       3.236      6.542    1.9E+05     2442.3
 MINIMUM                    1.200      2.060    6.8E+02        2.4
 DATE OF MINIMUM       1982-02-04 1982-09-14 1983-03-09 1983-05-06
 10TH PERCENTILE            1.206      3.000    3.8E+03           
 MEDIAN                     3.010      6.290    1.0E+05       57.1
 90TH PERCENTILE            4.976      9.200    4.9E+05           
 MAXIMUM                    7.340     11.700    9.0E+05     6678.0
 DATE OF MAXIMUM       1983-03-09 1983-03-09 1983-01-19 1982-03-04
 STANDARD DEVIATION         1.697      2.573    2.6E+05     2955.7





 STATION - RIO BLANCO                               STATION NO. 037008
 COUNTRY - MEXICO                                   DEPTH(M)       1.1
 LOCATION - OCT. 1  LAT. 18/44/30  LONG. 096/26/00  ELEVATION(M)  91.0
 REGIONAL CENTRE - AMRA                             WATER TYPE   RIVER      

 PERIOD REQUESTED FROM  - 1982-01-01 TO 1984-12-31
 PERIOD OF RECORD FROM  - 1982-01-28 TO 1983-12-06

 STATISTICS INCLUDE ALL FLAGGED DATA AS REPORTED


                             ELEC       TEMP       TEMP     N KJEL     NO3NO2
                             COND                                            
                            02041      02061      02062      07004      07105
                            us/cm      deg C      deg C     mg/L N     mg/L N


 NO. OF L-FLAGGED VALUES        0          0          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES        9         16          7         13          3
 MEAN                        520.       22.4        0.5        2.3       1.10
 MINIMUM                     415.       19.0        0.1        0.9           
 DATE OF MINIMUM       1983-02-19 1983-12-06 1982-02-15 1983-10-26           
 10TH PERCENTILE                        19.6                   1.1           
 MEDIAN                      528.       22.0        0.3        2.0           
 90TH PERCENTILE                        26.4                   3.3           
 MAXIMUM                     595.       27.0        1.9        3.4           
 DATE OF MAXIMUM       1982-10-29 1982-06-10 1982-03-17 1983-04-29           
 STANDARD DEVIATION           60.        2.7        0.6        0.8           




                              NH3         O2        BOD        COD        ALK
                                        DISS                            TOTAL
                            07554      08101      08201      08301      10102
                           mg/L N    mg/L O2    mg/L O2    mg/L O2       mg/L


 NO. OF L-FLAGGED VALUES        1          0          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       12         15         15         16         14
 MEAN                        3.04        4.4        13.        46.     203.29
 MINIMUM                     0.05        1.5         2.         4.      48.00
 DATE OF MINIMUM       1982-02-15 1982-03-17 1983-09-26 1983-12-06 1982-02-15
 10TH PERCENTILE             0.05        1.8         2.         5.      96.00
 MEDIAN                      0.05        4.7        14.        45.     197.50
 90TH PERCENTILE             1.01        6.1        18.        77.     247.00
 MAXIMUM                    36.00        6.5        40.       106.     348.00
 DATE OF MAXIMUM       1983-12-06 1983-09-26 1983-04-29 1982-02-15 1983-12-06
 STANDARD DEVIATION          9.91        1.6         9.        27.      64.45




                               pH   SUSP SOL   SUSP SOL         Mg      PO4-P
                                     105 DEG    180 DEG       DISS        SOL
                            10302      10401      10408      12102      15254
                         pH UNITS       mg/L       mg/L    mg/L Mg   mg/L PO4


 NO. OF L-FLAGGED VALUES        0          0          0          0          3
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       16         17         13          2         14
 MEAN                         7.7       156.       101.        18.      0.188
 MINIMUM                      6.0         4.         2.                 0.020
 DATE OF MINIMUM       1983-10-26 1983-09-26 1983-09-26            1983-04-29
 10TH PERCENTILE              6.0        19.         3.                 0.020
 MEDIAN                       8.0       110.        30.                 0.140
 90TH PERCENTILE              8.4       214.        72.                 0.387
 MAXIMUM                      8.5       995.       935.                 0.500
 DATE OF MAXIMUM       1983-11-14 1983-02-19 1983-02-19            1982-07-14
 STANDARD DEVIATION           0.8       227.       252.                 0.160




                              PO4   SULPHATE         Cl         Cl         Ca
                            TOTAL                  DISS       DISS       DISS
                            15403      16302      17201      17203      20103
                         mg/L PO4   mg/L SO4    mg/L Cl    mg/L Cl    mg/L Ca


 NO. OF L-FLAGGED VALUES        0          0          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       17          5          5         11          7
 MEAN                       0.452        32.        16.        18.    125.143
 MINIMUM                    0.070        18.        10.        11.     50.000
 DATE OF MINIMUM       1983-09-26 1983-09-26 1983-11-14 1982-01-28 1982-09-24
 10TH PERCENTILE            0.077                              11.           
 MEDIAN                     0.510        30.        18.        20.    133.000
 90TH PERCENTILE            0.780                              23.           
 MAXIMUM                    0.840        48.        24.        23.    206.000
 DATE OF MAXIMUM       1982-09-24 1983-12-06 1983-04-29 1982-06-10 1982-06-10
 STANDARD DEVIATION         0.284        12.         6.         5.     50.473




                         FAEC COL
                                 
                            36011
                         No/100ml


 NO. OF L-FLAGGED VALUES        0
 NO. OF G-FLAGGED VALUES        2
 NO. OF UNFLAGGED VALUES       12
 MEAN                     4.0E+04
 MINIMUM                  4.0E+01
 DATE OF MINIMUM       1982-01-28
 10TH PERCENTILE          6.2E+02
 MEDIAN                   4.0E+04
 90TH PERCENTILE          1.0E+05
 MAXIMUM                  1.1E+05
 DATE OF MAXIMUM       1982-03-17
 STANDARD DEVIATION       3.8E+04





 STATION - LAGO DE CHAPALA                          STATION NO. 037009
 COUNTRY - MEXICO                                   DEPTH(M)       6.0
 LOCATION - OCT. 1  LAT. 20/16/20  LONG. 103/02/17  ELEVATION(M)1525.0
 REGIONAL CENTRE - AMRA                             WATER TYPE   LAKE       

 PERIOD REQUESTED FROM  - 1982-01-01 TO 1984-12-31
 PERIOD OF RECORD FROM  - 1982-01-25 TO 1984-03-12

 STATISTICS INCLUDE ALL FLAGGED DATA AS REPORTED


                             ELEC       TEMP       TEMP     N KJEL     NO3NO2
                             COND                                            
                            02041      02061      02062      07004      07105
                            us/cm      deg C      deg C     mg/L N     mg/L N


 NO. OF L-FLAGGED VALUES        0          0          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES        8         17          2         25          7
 MEAN                        663.       20.3        0.1        0.8       0.28
 MINIMUM                     530.       16.0                   0.2       0.10
 DATE OF MINIMUM       1983-08-24 1982-11-11            1982-06-16 1984-03-12
 10TH PERCENTILE                        16.7                   0.5           
 MEDIAN                      665.       20.0                   0.8       0.27
 90TH PERCENTILE                        23.1                   0.9           
 MAXIMUM                     790.       23.7                   2.1       0.45
 DATE OF MAXIMUM       1983-06-26 1983-09-26            1984-02-21 1983-10-17
 STANDARD DEVIATION           82.        2.6                   0.3       0.12




                              NH3         O2        BOD        COD        ALK
                                        DISS                            TOTAL
                            07554      08101      08201      08301      10102
                           mg/L N    mg/L O2    mg/L O2    mg/L O2       mg/L


 NO. OF L-FLAGGED VALUES        9          0          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       15         22         24         11         24
 MEAN                        0.09        6.8         1.        19.     264.79
 MINIMUM                     0.05        5.3         1.        13.     121.00
 DATE OF MINIMUM       1982-02-17 1983-05-24 1984-03-12 1984-01-26 1983-04-23
 10TH PERCENTILE             0.05        6.3         1.        13.     208.20
 MEDIAN                      0.08        6.9         1.        17.     259.00
 90TH PERCENTILE             0.16        7.4         2.        26.     302.50
 MAXIMUM                     0.26        8.0         4.        37.     496.00
 DATE OF MAXIMUM       1982-04-14 1982-03-17 1982-02-17 1983-01-26 1983-03-01
 STANDARD DEVIATION          0.05        0.5         1.         7.      63.22




                               pH   SUSP SOL   SUSP SOL      PO4-P        PO4
                                     105 DEG    180 DEG        SOL      TOTAL
                            10302      10401      10408      15254      15403
                         pH UNITS       mg/L       mg/L   mg/L PO4   mg/L PO4


 NO. OF L-FLAGGED VALUES        0          0          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       23         25         25         25         24
 MEAN                         8.8       149.        34.      0.465      0.678
 MINIMUM                      8.4         4.         1.      0.230      0.310
 DATE OF MINIMUM       1982-03-17 1982-11-11 1984-01-26 1983-12-20 1983-12-20
 10TH PERCENTILE              8.4         4.         2.      0.290      0.358
 MEDIAN                       8.9        13.         6.      0.410      0.560
 90TH PERCENTILE              9.1       563.       127.      0.715      1.050
 MAXIMUM                      9.4       647.       173.      0.930      1.200
 DATE OF MAXIMUM       1984-02-21 1983-01-26 1983-01-26 1983-06-26 1982-06-16
 STANDARD DEVIATION           0.2       240.        56.      0.170      0.282




                         SULPHATE         Cl         Cl   FAEC COL       FAEC
                                        DISS       DISS                 STREP
                            16302      17201      17203      36011      36101
                         mg/L SO4    mg/L Cl    mg/L Cl   No/100ml   No/100ml


 NO. OF L-FLAGGED VALUES        0          0          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES        3          3         12         24          1
 MEAN                         73.        29.        31.       157.         3.
 MINIMUM                                            12.         3.           
 DATE OF MINIMUM                             1983-04-23 1982-09-10           
 10TH PERCENTILE                                    15.         3.           
 MEDIAN                                             30.         4.           
 90TH PERCENTILE                                    39.        68.           
 MAXIMUM                                            41.      2400.           
 DATE OF MAXIMUM                             1983-05-24 1982-06-16           
 STANDARD DEVIATION                                  8.       527.           





 STATION - PRESA DE LA AMISTAD                      STATION NO. 037010
 COUNTRY - MEXICO                                   DEPTH(M)      32.0
 LOCATION - OCT. 1  LAT. 29/25/25  LONG. 101/02/20  ELEVATION(M) 316.0
 REGIONAL CENTRE - AMRA                             WATER TYPE   LAKE       

 PERIOD REQUESTED FROM  - 1982-01-01 TO 1984-12-31
 PERIOD OF RECORD FROM  - 1982-04-12 TO 1983-11-16

 STATISTICS INCLUDE ALL FLAGGED DATA AS REPORTED


                             ELEC       TEMP     N KJEL     NO3NO2        NH3
                             COND                                            
                            02041      02061      07004      07105      07554
                            us/cm      deg C     mg/L N     mg/L N     mg/L N


 NO. OF L-FLAGGED VALUES        0          0          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES        7          4          3          1          3
 MEAN                        932.       20.8        0.1       0.27       0.05
 MINIMUM                     820.       18.0                                 
 DATE OF MINIMUM       1982-06-09 1982-04-12                                 
 10TH PERCENTILE                                                             
 MEDIAN                      940.       19.5                                 
 90TH PERCENTILE                                                             
 MAXIMUM                    1077.       26.0                                 
 DATE OF MAXIMUM       1983-05-17 1982-06-09                                 
 STANDARD DEVIATION           78.        3.6                                 




                               O2        BOD        COD        ALK         pH
                             DISS                            TOTAL           
                            08101      08201      08301      10102      10302
                          mg/L O2    mg/L O2    mg/L O2       mg/L   pH UNITS


 NO. OF L-FLAGGED VALUES        0          0          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES        3          4          7          7          7
 MEAN                         8.0         2.        35.     134.29        8.4
 MINIMUM                                  1.         4.     125.00        7.6
 DATE OF MINIMUM                  1982-04-12 1983-03-09 1983-11-16 1983-05-17
 10TH PERCENTILE                                                             
 MEDIAN                                   1.        25.     135.00        8.2
 90TH PERCENTILE                                                             
 MAXIMUM                                  3.       109.     143.00       10.6
 DATE OF MAXIMUM                  1983-11-16 1983-11-16 1982-05-06 1983-04-06
 STANDARD DEVIATION                       1.        37.       6.58        1.0




                         SUSP SOL   SUSP SOL      PO4-P        PO4   SULPHATE
                          105 DEG    180 DEG        SOL      TOTAL           
                            10401      10408      15254      15403      16302
                             mg/L       mg/L   mg/L PO4   mg/L PO4   mg/L SO4


 NO. OF L-FLAGGED VALUES        0          0          2          2          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES        7          7          0          0          2
 MEAN                         72.        39.      0.020      0.020       261.
 MINIMUM                       5.         2.                                 
 DATE OF MINIMUM       1983-03-09 1983-03-09                                 
 10TH PERCENTILE                                                             
 MEDIAN                       23.        17.                                 
 90TH PERCENTILE                                                             
 MAXIMUM                     246.       121.                                 
 DATE OF MAXIMUM       1982-04-12 1982-04-12                                 
 STANDARD DEVIATION           89.        50.                                 




                               Cl         Cl   FAEC COL
                             DISS       DISS           
                            17201      17203      36011
                          mg/L Cl    mg/L Cl   No/100ml


 NO. OF L-FLAGGED VALUES        0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0
 NO. OF UNFLAGGED VALUES        2          5          1
 MEAN                        126.       114.         3.
 MINIMUM                                106.           
 DATE OF MINIMUM                  1982-05-06           
 10TH PERCENTILE                                       
 MEDIAN                                 112.           
 90TH PERCENTILE                                       
 MAXIMUM                                120.           
 DATE OF MAXIMUM                  1983-04-06           
 STANDARD DEVIATION                       6.           





 STATION - POZO HACIENDA TAHDZIBICHEN               STATION NO. 037011
 COUNTRY - MEXICO                                   DEPTH(M)    9999.9
 LOCATION - OCT. 0  LAT. 20/27/50  LONG. 089/37/30  ELEVATION(M)   1.5
 REGIONAL CENTRE - AMRA                             WATER TYPE   GROUNDWATER

 PERIOD REQUESTED FROM  - 1982-01-01 TO 1984-12-31
 PERIOD OF RECORD FROM  - 1982-01-11 TO 1983-10-10

 STATISTICS INCLUDE ALL FLAGGED DATA AS REPORTED


                             ELEC       TEMP       TEMP     NO3NO2         O2
                             COND                                        DISS
                            02041      02061      02062      07105      08101
                            us/cm      deg C      deg C     mg/L N    mg/L O2


 NO. OF L-FLAGGED VALUES        0          0          3          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       19         19          1          6         18
 MEAN                       1248.       27.5        0.0      19.02        3.5
 MINIMUM                     450.       26.0        0.0       3.92        0.6
 DATE OF MINIMUM       1983-02-07 1982-01-11 1983-01-10 1983-05-03 1982-10-04
 10TH PERCENTILE             477.       26.0                              1.6
 MEDIAN                      625.       27.0        0.0       8.41        3.8
 90TH PERCENTILE            1000.       29.0                              4.9
 MAXIMUM                   11000.       29.0        0.1      47.80        5.7
 DATE OF MAXIMUM       1983-06-06 1983-04-05 1983-03-08 1983-08-22 1983-10-10
 STANDARD DEVIATION         2368.        1.0        0.0      19.54        1.3




                              BOD        COD        ALK         pH   SUSP SOL
                                                  TOTAL               105 DEG
                            08201      08301      10102      10302      10401
                          mg/L O2    mg/L O2       mg/L   pH UNITS       mg/L


 NO. OF L-FLAGGED VALUES        0          0          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       19         19         19         19         18
 MEAN                          3.        20.     248.11        7.6         5.
 MINIMUM                       1.         7.     132.00        7.2         2.
 DATE OF MINIMUM       1983-01-10 1983-01-10 1983-02-07 1983-10-10 1982-01-11
 10TH PERCENTILE               1.         8.     183.30        7.3         2.
 MEDIAN                        3.        18.     244.00        7.6         3.
 90TH PERCENTILE               5.        31.     317.90        8.0         7.
 MAXIMUM                       8.        35.     367.00        8.0        14.
 DATE OF MAXIMUM       1983-05-03 1982-03-29 1983-05-03 1983-04-05 1982-09-06
 STANDARD DEVIATION            2.         9.      56.81        0.2         3.




                         SUSP SOL        PO4   SULPHATE         Cl         Cl
                          180 DEG      TOTAL                  DISS       DISS
                            10408      15403      16302      17201      17203
                             mg/L   mg/L PO4   mg/L SO4    mg/L Cl    mg/L Cl


 NO. OF L-FLAGGED VALUES        0         12          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       10          5          6          6         13
 MEAN                          3.      0.052        27.        85.       105.
 MINIMUM                       2.      0.020        22.        37.        39.
 DATE OF MINIMUM       1982-10-04 1982-01-11 1983-07-05 1983-09-20 1982-12-06
 10TH PERCENTILE               2.      0.020                              43.
 MEDIAN                        3.      0.020        26.        64.        95.
 90TH PERCENTILE               4.      0.146                             166.
 MAXIMUM                       8.      0.180        30.       166.       193.
 DATE OF MAXIMUM       1982-09-06 1982-05-31 1983-05-03 1983-05-03 1982-03-29
 STANDARD DEVIATION            2.      0.056         3.        55.        50.




                         FAEC COL       FAEC
                                       STREP
                            36011      36101
                         No/100ml   No/100ml


 NO. OF L-FLAGGED VALUES        2          0
 NO. OF G-FLAGGED VALUES        2          0
 NO. OF UNFLAGGED VALUES       15          3
 MEAN                      11303.      1250.
 MINIMUM                      30.           
 DATE OF MINIMUM       1982-05-31           
 10TH PERCENTILE              30.           
 MEDIAN                      430.           
 90TH PERCENTILE           14140.           
 MAXIMUM                  100000.           
 DATE OF MAXIMUM       1983-08-22           
 STANDARD DEVIATION        31277.           





 STATION - POZO EN AGUASCALIENTES                   STATION NO. 037012
 COUNTRY - MEXICO                                   DEPTH(M)     120.0
 LOCATION - OCT. 1  LAT. 21/53/00  LONG. 103/18/00  ELEVATION(M)1850.0
 REGIONAL CENTRE - AMRA                             WATER TYPE   GROUNDWATER

 PERIOD REQUESTED FROM  - 1982-01-01 TO 1984-12-31
 PERIOD OF RECORD FROM  - 1982-01-19 TO 1984-02-06

 STATISTICS INCLUDE ALL FLAGGED DATA AS REPORTED


                             ELEC       TEMP     N KJEL     NO3NO2        NH3
                             COND                                            
                            02041      02061      07004      07105      07554
                            us/cm      deg C     mg/L N     mg/L N     mg/L N


 NO. OF L-FLAGGED VALUES        0          0          4          0         13
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES        9         21         17          3          8
 MEAN                        864.       29.5        0.4       1.76       0.06
 MINIMUM                     493.       20.0        0.1                  0.05
 DATE OF MINIMUM       1982-03-24 1984-01-16 1982-01-19            1982-03-24
 10TH PERCENTILE                        25.1        0.0                  0.05
 MEDIAN                      874.       30.0        0.1                  0.05
 90TH PERCENTILE                        31.9        0.9                  0.06
 MAXIMUM                    1130.       32.0        2.7                  0.33
 DATE OF MAXIMUM       1982-09-14 1983-03-03 1982-02-08            1982-01-19
 STANDARD DEVIATION          216.        2.9        0.7                  0.06




                              BOD        COD        ALK         pH   SUSP SOL
                                                  TOTAL               105 DEG
                            08201      08301      10102      10302      10401
                          mg/L O2    mg/L O2       mg/L   pH UNITS       mg/L


 NO. OF L-FLAGGED VALUES        5          2          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES        7         12         21         21         18
 MEAN                          0.         1.     307.38        7.4         4.
 MINIMUM                       0.         1.     237.00        6.0         1.
 DATE OF MINIMUM       1982-07-14 1982-03-24 1983-02-14 1982-09-14 1982-04-15
 10TH PERCENTILE               0.         1.     248.70        7.0         1.
 MEDIAN                        0.         1.     301.00        7.4         4.
 90TH PERCENTILE               0.         2.     355.20        7.9         7.
 MAXIMUM                       1.         3.     524.00        8.1        11.
 DATE OF MAXIMUM       1984-01-16 1983-09-05 1983-03-03 1984-01-16 1982-10-06
 STANDARD DEVIATION            0.         1.      60.04        0.5         3.




                               Na      PO4-P        PO4   SULPHATE         Cl
                             DISS        SOL      TOTAL                  DISS
                            11103      15254      15403      16302      17201
                          mg/L Na   mg/L PO4   mg/L PO4   mg/L SO4    mg/L Cl


 NO. OF L-FLAGGED VALUES        0         10         14          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES        3          0          7          1          1
 MEAN                         80.      0.020      0.030        24.        14.
 MINIMUM                               0.020      0.020                      
 DATE OF MINIMUM                  1982-01-19 1982-01-19                      
 10TH PERCENTILE                       0.020      0.020                      
 MEDIAN                                0.020      0.020                      
 90TH PERCENTILE                       0.020      0.020                      
 MAXIMUM                               0.020      0.220                      
 DATE OF MAXIMUM                  1982-12-07 1983-07-11                      
 STANDARD DEVIATION                    0.000      0.044                      





                               Cl          K   FAEC COL       FAEC
                             DISS       DISS                 STREP
                            17203      19103      36011      36101
                          mg/L Cl     mg/L K   No/100ml   No/100ml


 NO. OF L-FLAGGED VALUES        0          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0
 NO. OF UNFLAGGED VALUES       18          3          7          4
 MEAN                         22.       13.3         4.        10.
 MINIMUM                      17.                    2.         3.
 DATE OF MINIMUM       1982-12-07            1983-09-05 1983-01-18
 10TH PERCENTILE              19.                                 
 MEDIAN                       22.                    3.         6.
 90TH PERCENTILE              26.                                 
 MAXIMUM                      30.                    9.        23.
 DATE OF MAXIMUM       1983-06-13            1983-01-18 1983-04-04
 STANDARD DEVIATION            3.                    3.         9.





 STATION - POZO EN LA REGION LAGUNERA               STATION NO. 037013
 COUNTRY - MEXICO                                   DEPTH(M)     200.0
 LOCATION - OCT. 1  LAT. 25/26/00  LONG. 103/00/00  ELEVATION(M)1100.0
 REGIONAL CENTRE - AMRA                             WATER TYPE   GROUNDWATER

 PERIOD REQUESTED FROM  - 1982-01-01 TO 1984-12-31
 PERIOD OF RECORD FROM  - 1982-01-27 TO 1984-03-22

 STATISTICS INCLUDE ALL FLAGGED DATA AS REPORTED


                             ELEC       TEMP     N KJEL        NH3        ALK
                             COND                                       TOTAL
                            02041      02061      07004      07554      10102
                            us/cm      deg C     mg/L N     mg/L N       mg/L


 NO. OF L-FLAGGED VALUES        0          0          0          1          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       19         21          1          0         22
 MEAN                       1595.       25.8        0.1       0.05     214.50
 MINIMUM                    1270.       22.0                           180.00
 DATE OF MINIMUM       1984-03-22 1982-01-27                       1983-03-11
 10TH PERCENTILE            1309.       22.0                           184.80
 MEDIAN                     1565.       27.0                           217.00
 90TH PERCENTILE            1812.       28.0                           224.00
 MAXIMUM                    2400.       29.0                           282.00
 DATE OF MAXIMUM       1982-07-14 1982-09-03                       1982-06-24
 STANDARD DEVIATION          258.        2.4                            20.82




                               pH   SUSP SOL         Mg      PO4-P        PO4
                                     105 DEG       DISS        SOL      TOTAL
                            10302      10401      12102      15254      15403
                         pH UNITS       mg/L    mg/L Mg   mg/L PO4   mg/L PO4


 NO. OF L-FLAGGED VALUES        0          0          0          1          1
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       22          1          6          0          0
 MEAN                         7.7         6.        44.      0.020      0.020
 MINIMUM                      7.3                   34.                      
 DATE OF MINIMUM       1982-04-28            1983-03-11                      
 10TH PERCENTILE              7.3                                            
 MEDIAN                       7.7                   43.                      
 90TH PERCENTILE              8.1                                            
 MAXIMUM                      8.3                   57.                      
 DATE OF MAXIMUM       1983-03-11            1984-02-23                      
 STANDARD DEVIATION           0.3                    9.                      




                         SULPHATE         Cl         Cl         Ca   FAEC COL
                                        DISS       DISS       DISS           
                            16302      17201      17203      20103      36011
                         mg/L SO4    mg/L Cl    mg/L Cl    mg/L Ca   No/100ml


 NO. OF L-FLAGGED VALUES        0          0          0          0          1
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES        7          7         15          8          0
 MEAN                        376.        82.        86.    103.950         2.
 MINIMUM                     206.        70.        20.     34.400           
 DATE OF MINIMUM       1983-06-27 1983-12-14 1982-06-24 1984-02-23           
 10TH PERCENTILE                                    47.                      
 MEDIAN                      392.        84.        88.    123.500           
 90TH PERCENTILE                                    93.                      
 MAXIMUM                     461.        92.       149.    158.000           
 DATE OF MAXIMUM       1983-12-14 1983-07-28 1982-07-14 1983-03-11           
 STANDARD DEVIATION           86.         9.        25.     53.252           





 STATION - RIO LERMA                                STATION NO. 037014
 COUNTRY - MEXICO                                   DEPTH(M)    9999.9
 LOCATION - OCT. 1  LAT. 20/34/00  LONG. 101/12/00  ELEVATION(M)9999.9
 REGIONAL CENTRE - AMRA                             WATER TYPE   RIVER      

 PERIOD REQUESTED FROM  - 1982-01-01 TO 1984-12-31
 PERIOD OF RECORD FROM  - 1982-01-11 TO 1984-03-05

 STATISTICS INCLUDE ALL FLAGGED DATA AS REPORTED


                             ELEC       TEMP       TEMP     N KJEL     NO3NO2
                             COND                                            
                            02041      02061      02062      07004      07105
                            us/cm      deg C      deg C     mg/L N     mg/L N


 NO. OF L-FLAGGED VALUES        0          0          4          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       18         18          9         18          6
 MEAN                       1736.       27.1        0.3       12.0       3.37
 MINIMUM                     260.       18.0        0.0        0.4       0.10
 DATE OF MINIMUM       1983-07-20 1984-02-06 1983-05-09 1982-05-10 1983-10-03
 10TH PERCENTILE             400.       21.2        0.0        1.8           
 MEDIAN                     1775.       27.5        0.2        5.5       3.51
 90TH PERCENTILE            2736.       33.0        0.4       18.9           
 MAXIMUM                    3875.       34.0        1.4       94.0       5.14
 DATE OF MAXIMUM       1982-02-08 1982-04-14 1983-02-09 1982-02-08 1983-12-06
 STANDARD DEVIATION         1083.        4.7        0.4       21.1       1.74




                              NH3         O2        BOD        COD        ALK
                                        DISS                            TOTAL
                            07554      08101      08201      08301      10102
                           mg/L N    mg/L O2    mg/L O2    mg/L O2       mg/L


 NO. OF L-FLAGGED VALUES        0          8          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       18          9         17         18         18
 MEAN                       78.38        0.6        68.       279.     348.44
 MINIMUM                     1.38        0.1         8.        55.     115.00
 DATE OF MINIMUM       1983-04-05 1982-01-11 1983-05-09 1983-05-09 1983-07-20
 10TH PERCENTILE             1.94        0.1         8.        64.     131.80
 MEDIAN                     71.55        0.1        62.       240.     353.50
 90TH PERCENTILE           143.90        2.4       140.       608.     542.00
 MAXIMUM                   252.00        3.0       203.       646.     620.00
 DATE OF MAXIMUM       1982-02-08 1984-02-06 1983-12-06 1983-03-07 1982-02-08
 STANDARD DEVIATION         71.95        1.0        57.       202.     167.50




                               pH   SUSP SOL         Na         Mg      PO4-P
                                     105 DEG       DISS       DISS        SOL
                            10302      10401      11103      12102      15254
                         pH UNITS       mg/L    mg/L Na    mg/L Mg   mg/L PO4


 NO. OF L-FLAGGED VALUES        0          0          0          0          1
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       18         18          2          3         17
 MEAN                         8.2       214.         3.         1.      0.793
 MINIMUM                      7.1         5.                            0.020
 DATE OF MINIMUM       1983-10-03 1983-10-03                       1983-03-07
 10TH PERCENTILE              7.2        13.                            0.084
 MEDIAN                       8.2       105.                            0.515
 90TH PERCENTILE              8.9       258.                            1.444
 MAXIMUM                      9.3      1580.                            3.220
 DATE OF MAXIMUM       1982-01-11 1983-07-20                       1982-04-14
 STANDARD DEVIATION           0.6       361.                            0.795





                              PO4   SULPHATE         Cl         Cl         Ca
                            TOTAL                  DISS       DISS       DISS
                            15403      16302      17201      17203      20103
                         mg/L PO4   mg/L SO4    mg/L Cl    mg/L Cl    mg/L Ca


 NO. OF L-FLAGGED VALUES        0          0          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       18          3          3         14          3
 MEAN                      23.811       672.       126.        79.      0.793
 MINIMUM                    0.120                               6.           
 DATE OF MINIMUM       1982-05-10                       1983-07-20           
 10TH PERCENTILE            0.608                              12.           
 MEDIAN                     2.010                              62.           
 90TH PERCENTILE            5.773                             173.           
 MAXIMUM                  388.000                             215.           
 DATE OF MAXIMUM       1982-01-11                       1982-03-08           
 STANDARD DEVIATION        90.911                              69.           




                         FAEC COL       INST
                                      DISCHG
                            36011      97160
                         No/100ml       m3/S


 NO. OF L-FLAGGED VALUES        0          0
 NO. OF G-FLAGGED VALUES        9          0
 NO. OF UNFLAGGED VALUES        9          2
 MEAN                     3.0E+05     5355.8
 MINIMUM                  9.0E+04           
 DATE OF MINIMUM       1984-02-06           
 10TH PERCENTILE          9.2E+04           
 MEDIAN                   1.0E+05           
 90TH PERCENTILE          9.3E+05           
 MAXIMUM                  1.0E+06           
 DATE OF MAXIMUM       1982-04-14           
 STANDARD DEVIATION       3.4E+05           




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GEMS/WATER
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Last updated: 2001-07-30