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STATISTICS for MEXICO

STATISTICS FOR MEXICO


GEMS/WATER - STATISTICAL SUMMARY BY STATION     2002-02-15   PAGE 415

 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  - 1979-01-01 TO 1981-12-31
 PERIOD OF RECORD FROM  - 1979-02-07 TO 1981-12-08

 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         11          0         22
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       33         41         30         21         13
 MEAN                       1380.       23.0        0.2        1.4       0.22
 MINIMUM                     872.       12.2        0.0        0.1       0.05
 DATE OF MINIMUM       1979-05-02 1979-02-07 1979-08-08 1981-05-27 1979-03-07
 10TH PERCENTILE            1029.       15.0        0.0        0.5       0.05
 MEDIAN                     1224.       23.0        0.2        1.7       0.05
 90TH PERCENTILE            1824.       29.3        0.3        2.0       0.47
 MAXIMUM                    2152.       30.0        0.8        2.9       1.60
 DATE OF MAXIMUM       1981-11-24 1981-08-25 1980-04-16 1980-09-03 1980-06-25
 STANDARD DEVIATION          354.        5.5        0.2        0.7       0.31




                               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       41         38         40         41         41
 MEAN                         7.9         7.        59.     155.78        8.0
 MINIMUM                      5.4         2.         4.      80.00        7.4
 DATE OF MINIMUM       1979-06-14 1980-05-14 1979-02-07 1980-03-05 1981-06-24
 10TH PERCENTILE              5.9         3.        21.     140.00        7.7
 MEDIAN                       7.9         6.        58.     160.00        8.0
 90TH PERCENTILE              9.5        11.        97.     176.40        8.2
 MAXIMUM                     11.0        43.       150.     190.00        8.3
 DATE OF MAXIMUM       1980-12-10 1980-02-06 1981-11-24 1981-12-08 1981-03-17
 STANDARD DEVIATION           1.4         7.        30.      22.65        0.2




                         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         23          2          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       38          3         15         39         20
 MEAN                         59.        61.      0.063      0.207       260.
 MINIMUM                       6.                 0.020      0.020       182.
 DATE OF MINIMUM       1979-08-08            1979-02-07 1981-04-28 1979-06-14
 10TH PERCENTILE              15.                 0.020      0.073       192.
 MEDIAN                       46.                 0.020      0.210       260.
 90TH PERCENTILE              97.                 0.190      0.350       310.
 MAXIMUM                     251.                 0.310      0.450       326.
 DATE OF MAXIMUM       1979-10-02            1980-03-19 1980-10-15 1979-10-02
 STANDARD DEVIATION           48.                 0.081      0.097        37.






                               Cl         Ca   FAEC COL       INST
                             DISS       DISS                DISCHG
                            17203      20103      36011      97160
                          mg/L Cl    mg/L Ca   No/100ml       m3/S


 NO. OF L-FLAGGED VALUES        0          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0
 NO. OF UNFLAGGED VALUES       41         30         26          6
 MEAN                        164.     90.500       674.       45.0
 MINIMUM                     100.     48.000        15.        1.5
 DATE OF MINIMUM       1980-04-30 1980-07-23 1981-04-28 1981-07-28
 10TH PERCENTILE             123.     60.000        35.           
 MEDIAN                      156.     68.000       240.       29.0
 90TH PERCENTILE             214.    150.000      1620.           
 MAXIMUM                     251.    240.000      2400.      107.0
 DATE OF MAXIMUM       1981-11-24 1980-02-06 1980-04-30 1980-10-15
 STANDARD DEVIATION           35.     50.217       750.       40.4





 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  - 1979-01-01 TO 1981-12-31
 PERIOD OF RECORD FROM  - 1980-01-07 TO 1981-12-09

 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          9          2         20
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES        5         10         14         18          3
 MEAN                       1001.       20.1        1.2        0.7       0.11
 MINIMUM                     445.       15.0        0.0        0.1       0.05
 DATE OF MINIMUM       1981-10-21 1981-12-09 1981-01-26 1981-04-22 1980-01-07
 10TH PERCENTILE                        15.0        0.0        0.1       0.05
 MEDIAN                     1130.       19.5        0.2        0.6       0.05
 90TH PERCENTILE                        26.0        1.0        1.2       0.26
 MAXIMUM                    1160.       26.0       20.0        1.7       0.66
 DATE OF MAXIMUM       1981-11-18 1981-09-15 1981-04-22 1980-06-09 1981-07-17
 STANDARD DEVIATION          312.        4.2        4.1        0.5       0.16




                               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       23         19         21         23         22
 MEAN                         7.7         2.        16.     245.17        7.9
 MINIMUM                      4.7         1.         2.     143.00        7.0
 DATE OF MINIMUM       1981-08-20 1980-04-09 1981-09-15 1981-09-15 1981-06-12
 10TH PERCENTILE              5.0         1.         4.     198.40        7.4
 MEDIAN                       7.7         2.        11.     254.00        7.9
 90TH PERCENTILE              9.9         4.        28.     264.00        8.2
 MAXIMUM                     14.0         6.        72.     270.00        8.3
 DATE OF MAXIMUM       1981-09-15 1980-10-22 1981-10-21 1980-01-07 1981-01-26
 STANDARD DEVIATION           2.2         1.        18.      28.54        0.3




                         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          1          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       23         16         20         21          3
 MEAN                        167.        14.      0.278      0.450       179.
 MINIMUM                      24.         3.      0.020      0.020           
 DATE OF MINIMUM       1981-01-26 1981-01-26 1980-01-07 1980-02-09           
 10TH PERCENTILE              31.         3.      0.022      0.084           
 MEDIAN                       60.         8.      0.175      0.235           
 90TH PERCENTILE             371.        36.      0.630      0.840           
 MAXIMUM                     827.        45.      1.240      3.120           
 DATE OF MAXIMUM       1981-02-12 1981-05-18 1981-11-18 1981-11-18           
 STANDARD DEVIATION          220.        13.      0.291      0.650           





                               Cl         Ca   FAEC COL       FAEC
                             DISS       DISS                 STREP
                            17203      20103      36011      36101
                          mg/L Cl    mg/L Ca   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       23         12         22         19
 MEAN                         38.    105.608    1.4E+04      6010.
 MINIMUM                       6.     37.000    4.0E+01        40.
 DATE OF MINIMUM       1981-09-15 1980-12-03 1981-10-21 1981-03-19
 10TH PERCENTILE              14.     37.200    9.0E+01        43.
 MEDIAN                       36.    133.000    4.3E+02       240.
 90TH PERCENTILE              50.    141.800    2.4E+04      6270.
 MAXIMUM                      85.    147.000    1.5E+05     75000.
 DATE OF MAXIMUM       1981-08-20 1980-10-22 1981-01-26 1981-01-26
 STANDARD DEVIATION           15.     45.083    3.7E+04     17562.





 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  - 1979-01-01 TO 1981-12-31
 PERIOD OF RECORD FROM  - 1979-01-08 TO 1981-07-21

 STATISTICS INCLUDE ALL FLAGGED DATA AS REPORTED


                             ELEC       TEMP     N KJEL        NH3         O2
                             COND                                        DISS
                            02041      02061      07004      07554      08101
                            us/cm      deg C     mg/L N     mg/L N    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       29         29          3         13         27
 MEAN                       1126.       23.0        0.8       0.18        8.6
 MINIMUM                     700.       12.0                  0.05        4.0
 DATE OF MINIMUM       1979-06-06 1979-01-08            1979-10-04 1979-02-12
 10TH PERCENTILE             784.       14.9                  0.05        5.9
 MEDIAN                     1100.       24.0                  0.05        8.5
 90TH PERCENTILE            1500.       30.0                  0.35       10.3
 MAXIMUM                    1900.       32.0                  0.53       15.0
 DATE OF MAXIMUM       1980-01-04 1980-09-23            1979-08-07 1980-01-04
 STANDARD DEVIATION          273.        5.9                  0.17        2.0




                              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       30         33         26         31         33
 MEAN                          3.        62.     153.42        7.4       160.
 MINIMUM                       1.        10.      28.00        6.0         3.
 DATE OF MINIMUM       1979-05-02 1979-04-18 1981-03-19 1980-01-04 1979-11-13
 10TH PERCENTILE               1.        10.     112.60        6.0        16.
 MEDIAN                        3.        39.     157.00        7.9        84.
 90TH PERCENTILE               5.        90.     188.00        8.3       396.
 MAXIMUM                      10.       680.     231.00        8.5       744.
 DATE OF MAXIMUM       1981-01-28 1979-03-08 1981-02-19 1980-12-02 1980-05-22
 STANDARD DEVIATION            2.       116.      38.11        1.0       185.




                         SUSP SOL   VOL SUSP      PO4-P   SULPHATE         Cl
                          180 DEG     SOLIDS        SOL                  DISS
                            10408      10511      15254      16302      17203
                             mg/L       mg/L   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       19          5          1         19         34
 MEAN                         34.        98.     52.000       292.       286.
 MINIMUM                       0.         4.                  106.        99.
 DATE OF MINIMUM       1980-11-03 1980-01-29            1979-08-07 1981-06-02
 10TH PERCENTILE               2.                             110.       126.
 MEDIAN                       16.        64.                  266.       220.
 90TH PERCENTILE              76.                             370.       586.
 MAXIMUM                     176.       264.                  879.       833.
 DATE OF MAXIMUM       1979-03-08 1980-05-22            1980-07-25 1979-10-04
 STANDARD DEVIATION           43.       105.                  162.       188.




                               Ca       INST
                             DISS     DISCHG
                            20103      97160
                          mg/L Ca       m3/S


 NO. OF L-FLAGGED VALUES        0          0
 NO. OF G-FLAGGED VALUES        0          0
 NO. OF UNFLAGGED VALUES       23         11
 MEAN                      90.800       80.0
 MINIMUM                   10.400        7.2
 DATE OF MINIMUM       1979-06-06 1979-02-12
 10TH PERCENTILE           21.280        8.0
 MEDIAN                    88.000       40.4
 90TH PERCENTILE          143.360      203.8
 MAXIMUM                  169.600      275.0
 DATE OF MAXIMUM       1980-07-25 1979-10-04
 STANDARD DEVIATION        48.609       86.2





 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  - 1979-01-01 TO 1981-12-31
 PERIOD OF RECORD FROM  - 1979-01-24 TO 1981-12-07

 STATISTICS INCLUDE ALL FLAGGED DATA AS REPORTED


                             ELEC       TEMP       TEMP     N KJEL     N KJEL
                             COND                                            
                            02041      02061      02062      07001      07004
                            us/cm      deg C      deg C     mg/L N     mg/L N


 NO. OF L-FLAGGED VALUES        0          0          6          0          1
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       32         35         20          6         10
 MEAN                        772.       25.9        0.1        0.4        0.5
 MINIMUM                     351.       19.5        0.0        0.1        0.1
 DATE OF MINIMUM       1979-09-12 1979-01-24 1979-01-24 1980-01-21 1981-02-18
 10TH PERCENTILE             456.       21.0        0.0                   0.1
 MEDIAN                      798.       25.0        0.1        0.4        0.4
 90TH PERCENTILE            1026.       30.8        0.2                   1.0
 MAXIMUM                    1131.       32.0        0.3        0.6        1.0
 DATE OF MAXIMUM       1980-06-10 1981-05-14 1981-07-13 1980-04-17 1981-04-27
 STANDARD DEVIATION          208.        3.8        0.1        0.2        0.4




                           NO3NO2        NH3         O2        BOD        COD
                                                   DISS                      
                            07105      07554      08101      08201      08301
                           mg/L N     mg/L N    mg/L O2    mg/L O2    mg/L O2


 NO. OF L-FLAGGED VALUES        0         16          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES        6          7         36         35         35
 MEAN                        2.84       0.10        7.5         1.        19.
 MINIMUM                     0.92       0.05        1.8         0.         3.
 DATE OF MINIMUM       1980-03-11 1980-02-19 1979-06-13 1980-10-15 1979-11-07
 10TH PERCENTILE                        0.05        5.7         0.         5.
 MEDIAN                      2.99       0.05        7.6         1.        12.
 90TH PERCENTILE                        0.20        9.5         2.        23.
 MAXIMUM                     5.31       0.37       12.0         7.       198.
 DATE OF MAXIMUM       1980-01-21 1981-01-28 1979-05-09 1979-06-13 1979-06-13
 STANDARD DEVIATION          1.63       0.08        1.9         1.        33.




                              ALK         pH   SUSP SOL   SUSP SOL   VOL SUSP
                            TOTAL               105 DEG    180 DEG     SOLIDS
                            10102      10302      10401      10408      10511
                             mg/L   pH UNITS       mg/L       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       36         36         34         28          6
 MEAN                      171.11        8.1       337.        61.         8.
 MINIMUM                    97.00        7.7         5.         2.         1.
 DATE OF MINIMUM       1979-06-13 1980-08-21 1980-06-10 1980-07-16 1980-01-21
 10TH PERCENTILE           126.00        8.0        13.         5.           
 MEDIAN                    177.00        8.1        45.        21.         5.
 90TH PERCENTILE           202.00        8.2       549.       109.           
 MAXIMUM                   222.00        8.4      7318.       724.        28.
 DATE OF MAXIMUM       1981-11-17 1980-09-23 1979-06-13 1979-06-13 1980-05-13
 STANDARD DEVIATION         30.91        0.1      1247.       135.        10.




                               Na         Mg         Mg      PO4-P        PO4
                             DISS       DISS       DISS        SOL      TOTAL
                            11103      12102      12103      15254      15403
                          mg/L Na    mg/L Mg    mg/L Mg   mg/L PO4   mg/L PO4


 NO. OF L-FLAGGED VALUES        0          0          0          2          1
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       10          9          1         26         19
 MEAN                         33.        27.        29.      0.062      0.077
 MINIMUM                      27.        21.                 0.010      0.010
 DATE OF MINIMUM       1980-04-17 1981-05-14            1980-01-21 1980-03-11
 10TH PERCENTILE              27.                            0.018      0.020
 MEDIAN                       34.        24.                 0.040      0.065
 90TH PERCENTILE              36.                            0.121      0.130
 MAXIMUM                      40.        34.                 0.250      0.170
 DATE OF MAXIMUM       1981-04-27 1980-06-10            1979-09-12 1981-10-20
 STANDARD DEVIATION            4.         4.                 0.053      0.044




                         SULPHATE         Cl         Cl          K         Ca
                                        DISS       DISS       DISS       DISS
                            16302      17201      17203      19103      20101
                         mg/L SO4    mg/L Cl    mg/L Cl     mg/L K    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       28         10         26         10         10
 MEAN                        200.        34.        24.        5.5     98.220
 MINIMUM                      31.        30.         8.        4.0     46.400
 DATE OF MINIMUM       1979-09-12 1981-03-09 1981-09-22 1980-01-21 1981-05-14
 10TH PERCENTILE              41.        30.        14.        4.0     46.400
 MEDIAN                      211.        35.        24.        5.7    116.000
 90TH PERCENTILE             333.        37.        32.        6.8    136.000
 MAXIMUM                     340.        39.        38.        7.2    140.000
 DATE OF MAXIMUM       1981-04-27 1981-04-27 1979-03-08 1981-06-10 1980-02-19
 STANDARD DEVIATION           99.         3.         7.        1.2     38.495




                               Ca         Mn         Fe         Cu         Zn
                             DISS       DISS      TOTAL       DISS       DISS
                            20103      25101      26004      29106      30101
                          mg/L Ca    mg/L Mn    mg/L Fe    mg/L Cu    mg/L Zn


 NO. OF L-FLAGGED VALUES        0          1          1          4          6
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       13          7          9          0          3
 MEAN                      86.877       0.08       0.87      0.050      0.062
 MINIMUM                   42.800       0.05       0.34      0.050      0.020
 DATE OF MINIMUM       1981-01-28 1980-01-21 1980-03-11 1981-03-09 1981-03-09
 10TH PERCENTILE           44.240                  0.34                      
 MEDIAN                    88.900       0.06       0.52      0.050      0.050
 90TH PERCENTILE          115.200                  2.20                      
 MAXIMUM                  136.000       0.20       2.54      0.050      0.200
 DATE OF MAXIMUM       1980-07-16 1981-04-27 1981-06-10 1981-06-10 1981-06-10
 STANDARD DEVIATION        26.818       0.05       0.81      0.000      0.054




                         FAEC COL         Ba         Hg       INST
                                       TOTAL       DISS     DISCHG
                            36011      80011      80111      97160
                         No/100ml    ug/L Hg    ug/L Hg       m3/S


 NO. OF L-FLAGGED VALUES        4          1          8          1
 NO. OF G-FLAGGED VALUES        0          0          0          0
 NO. OF UNFLAGGED VALUES       32          0          0         21
 MEAN                       1138.      0.500      0.199      475.2
 MINIMUM                       2.                 0.050        0.1
 DATE OF MINIMUM       1979-03-08            1980-01-21 1980-07-16
 10TH PERCENTILE               3.                             82.1
 MEDIAN                      120.                 0.050      293.5
 90TH PERCENTILE            1700.                           1114.4
 MAXIMUM                   16000.                 0.500     2854.0
 DATE OF MAXIMUM       1980-04-17            1981-06-10 1979-09-12
 STANDARD DEVIATION         3095.                 0.211      635.3





 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  - 1979-01-01 TO 1981-12-31
 PERIOD OF RECORD FROM  - 1979-01-17 TO 1981-11-25

 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          1          3
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES        1         22          6          7          9
 MEAN                        600.       26.2        0.2        0.6       0.27
 MINIMUM                                21.1        0.0        0.1       0.05
 DATE OF MINIMUM                  1981-02-17 1979-01-17 1981-02-17 1979-02-21
 10TH PERCENTILE                        22.3        0.0                  0.05
 MEDIAN                                 27.0        0.2        0.6       0.09
 90TH PERCENTILE                        28.4        0.2                  0.62
 MAXIMUM                                31.0        0.8        1.2       0.70
 DATE OF MAXIMUM                  1981-06-15 1980-08-26 1980-07-21 1980-07-21
 STANDARD DEVIATION                      2.3        0.2        0.4       0.27




                               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         20         23         23
 MEAN                         6.5         3.        64.      86.96        7.4
 MINIMUM                      3.4         0.         6.      16.00        5.4
 DATE OF MINIMUM       1980-09-22 1980-03-26 1980-12-17 1979-01-17 1981-04-20
 10TH PERCENTILE              3.7         1.         8.      26.10        7.1
 MEDIAN                       6.7         2.        40.      68.00        7.6
 90TH PERCENTILE              8.6         5.        90.     139.20        7.8
 MAXIMUM                     12.0         6.       380.     290.00        8.2
 DATE OF MAXIMUM       1980-03-26 1980-07-21 1981-05-11 1981-10-05 1980-04-21
 STANDARD DEVIATION           2.0         2.        83.      66.47        0.5




                         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         10          4          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       22          4          5          9          3
 MEAN                         73.        10.      0.079      0.477      1107.
 MINIMUM                       1.         6.      0.020      0.020           
 DATE OF MINIMUM       1980-02-20 1981-10-05 1980-03-26 1980-08-26           
 10TH PERCENTILE               4.                 0.020      0.020           
 MEDIAN                       18.        10.      0.020      0.090           
 90TH PERCENTILE              74.                 0.130      0.807           
 MAXIMUM                     990.        14.      0.650      3.900           
 DATE OF MAXIMUM       1981-11-25 1979-02-21 1979-01-17 1980-03-26           
 STANDARD DEVIATION          206.         4.      0.164      1.066           




                               Cl         Ca   FAEC COL       FAEC
                             DISS       DISS                 STREP
                            17203      20103      36011      36101
                          mg/L Cl    mg/L Ca   No/100ml   No/100ml


 NO. OF L-FLAGGED VALUES        0          0          0          2
 NO. OF G-FLAGGED VALUES        0          0          0          0
 NO. OF UNFLAGGED VALUES       21         15          9          0
 MEAN                        872.     39.093      2073.        16.
 MINIMUM                      19.      4.000       430.           
 DATE OF MINIMUM       1980-12-17 1980-12-17 1980-02-20           
 10TH PERCENTILE              20.     12.400                      
 MEDIAN                       85.     28.800      1500.           
 90TH PERCENTILE            2416.     72.500                      
 MAXIMUM                    6381.     93.200      4600.           
 DATE OF MAXIMUM       1980-01-28 1979-02-21 1980-03-26           
 STANDARD DEVIATION         1542.     25.135      1587.           





 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  - 1979-01-01 TO 1981-12-31
 PERIOD OF RECORD FROM  - 1979-01-23 TO 1981-06-04

 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          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       21         26         26         12         27
 MEAN                        287.       29.3        0.1        1.7       0.84
 MINIMUM                      66.       25.0        0.0        0.5       0.06
 DATE OF MINIMUM       1979-04-25 1980-01-08 1979-03-27 1980-11-25 1980-03-25
 10TH PERCENTILE              82.       26.0        0.0        0.5       0.25
 MEDIAN                      200.       29.0        0.1        0.9       0.46
 90TH PERCENTILE             500.       32.0        0.1        3.5       1.16
 MAXIMUM                     950.       35.0        0.2        6.9       4.65
 DATE OF MAXIMUM       1979-01-23 1980-07-24 1980-09-20 1980-07-24 1980-07-24
 STANDARD DEVIATION          218.        2.5        0.1        1.9       1.14




                               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       27         27         25         28         25
 MEAN                         6.9         2.       176.     302.32        8.1
 MINIMUM                      3.8         0.         4.     115.00        7.6
 DATE OF MINIMUM       1980-06-24 1979-03-27 1979-01-23 1980-01-29 1980-08-22
 10TH PERCENTILE              4.6         0.         6.     173.20        7.7
 MEDIAN                       7.0         1.        31.     196.50        8.1
 90TH PERCENTILE              8.8         4.       555.     615.40        8.4
 MAXIMUM                      9.7         6.      1000.    1255.00        8.4
 DATE OF MAXIMUM       1979-07-24 1979-04-25 1980-07-24 1980-08-22 1981-02-24
 STANDARD DEVIATION           1.6         2.       296.     250.51        0.2




                         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          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       27         25         28         28         14
 MEAN                       4641.       288.      0.836      1.226       505.
 MINIMUM                      12.         4.      0.040      0.050        26.
 DATE OF MINIMUM       1980-03-25 1981-02-24 1979-01-23 1979-11-27 1980-06-24
 10TH PERCENTILE              18.         6.      0.040      0.060        60.
 MEDIAN                     2000.       140.      0.080      0.380       484.
 90TH PERCENTILE           15860.       923.      2.630      3.130       782.
 MAXIMUM                   23730.      1920.      6.100      7.850      1112.
 DATE OF MAXIMUM       1979-08-28 1979-08-28 1980-07-24 1980-09-20 1980-02-26
 STANDARD DEVIATION         6828.       455.      1.810      2.225       290.




                               Cl         Ca   FAEC COL       FAEC
                             DISS       DISS                 STREP
                            17203      20103      36011      36101
                          mg/L Cl    mg/L Ca   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       28         20         24         13
 MEAN                         25.    215.370    1.4E+04    2.4E+04
 MINIMUM                       8.     40.800    2.4E+01    4.0E+01
 DATE OF MINIMUM       1979-08-28 1979-09-25 1979-08-28 1980-03-25
 10TH PERCENTILE              12.     44.400    3.6E+01    4.0E+01
 MEDIAN                       19.    218.000    1.7E+03    1.1E+04
 90TH PERCENTILE              32.    411.000    1.8E+04    7.7E+04
 MAXIMUM                     125.    546.800    2.4E+05    1.1E+05
 DATE OF MAXIMUM       1979-03-27 1979-04-25 1980-10-26 1980-10-26
 STANDARD DEVIATION           23.    138.104    4.9E+04    3.7E+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  - 1979-01-01 TO 1981-12-31
 PERIOD OF RECORD FROM  - 1979-01-25 TO 1981-12-03

 STATISTICS INCLUDE ALL FLAGGED DATA AS REPORTED


                             TEMP       TEMP     N KJEL        NH3         O2
                                                                         DISS
                            02061      02062      07004      07554      08101
                            deg C      deg C     mg/L N     mg/L N    mg/L O2


 NO. OF L-FLAGGED VALUES        0          0          0          5          2
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       33          1         20         27         31
 MEAN                        19.7        0.2        3.4       2.77        3.4
 MINIMUM                     16.0                   0.3       0.05        0.1
 DATE OF MINIMUM       1980-01-15            1980-12-19 1979-01-25 1979-03-12
 10TH PERCENTILE             16.3                   0.6       0.05        0.4
 MEDIAN                      20.0                   3.5       2.00        3.1
 90TH PERCENTILE             23.4                   5.6       5.85        5.9
 MAXIMUM                     24.0                   7.6      11.30        7.0
 DATE OF MAXIMUM       1979-07-02            1981-01-29 1979-03-12 1979-09-06
 STANDARD DEVIATION           2.3                   1.9       2.59        2.0




                              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       32         33         33         33         22
 MEAN                         47.       111.        7.2       411.        91.
 MINIMUM                       1.        12.        2.9        16.        22.
 DATE OF MINIMUM       1981-03-26 1980-08-01 1981-09-18 1981-02-26 1979-02-16
 10TH PERCENTILE              10.        29.        7.0        65.        31.
 MEDIAN                       35.        97.        7.5       200.        72.
 90TH PERCENTILE              96.       206.        7.7       927.       145.
 MAXIMUM                     171.       380.        7.9      2620.       340.
 DATE OF MAXIMUM       1980-02-14 1980-02-14 1981-02-26 1979-09-06 1979-09-06
 STANDARD DEVIATION           43.        78.        0.9       531.        68.




                            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          2          0
 NO. OF UNFLAGGED VALUES       33         33         10          2
 MEAN                       6.130     12.092    3.1E+05       35.3
 MINIMUM                    0.600      1.000    7.0E+01           
 DATE OF MINIMUM       1981-10-08 1979-05-17 1979-08-15           
 10TH PERCENTILE            1.021      1.811    2.4E+02           
 MEDIAN                     4.400      7.600    9.5E+04           
 90TH PERCENTILE           14.100     21.600    1.0E+06           
 MAXIMUM                   25.400     63.000    1.0E+06           
 DATE OF MAXIMUM       1980-02-14 1980-02-14 1980-09-27           
 STANDARD DEVIATION         6.030     15.752    4.2E+05           





 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  - 1979-01-01 TO 1981-12-31
 PERIOD OF RECORD FROM  - 1979-01-10 TO 1981-11-23

 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          0          0          7
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       24         26         27         14         17
 MEAN                        449.       23.5        0.8        3.0       0.38
 MINIMUM                     300.       20.0        0.0        1.8       0.05
 DATE OF MINIMUM       1979-07-10 1979-01-10 1981-08-26 1980-12-22 1979-01-10
 10TH PERCENTILE             314.       20.0        0.1        2.0       0.05
 MEDIAN                      430.       22.5        0.4        2.8       0.05
 90TH PERCENTILE             538.       26.4        0.9        4.0       0.05
 MAXIMUM                     777.       34.0        9.6        5.0       7.20
 DATE OF MAXIMUM       1981-09-21 1981-11-23 1981-03-24 1981-04-21 1980-03-24
 STANDARD DEVIATION          113.        3.3        1.8        0.8       1.46




                               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       28         28         27         28         27
 MEAN                         5.0        22.        59.     250.46        7.5
 MINIMUM                      1.6         1.         8.      19.00        5.0
 DATE OF MINIMUM       1980-05-19 1981-09-21 1980-07-29 1980-03-24 1979-01-10
 10TH PERCENTILE              1.9         2.        15.     122.40        6.0
 MEDIAN                       4.9        10.        48.     241.50        7.6
 90TH PERCENTILE              7.2        21.        90.     423.20        8.4
 MAXIMUM                      8.1       321.       283.     450.00        8.7
 DATE OF MAXIMUM       1981-07-29 1980-04-21 1981-08-26 1980-06-16 1980-09-22
 STANDARD DEVIATION           1.9        59.        53.     110.09        0.9




                         SUSP SOL   SUSP SOL   VOL SUSP      PO4-P        PO4
                          105 DEG    180 DEG     SOLIDS        SOL      TOTAL
                            10401      10408      10511      15254      15403
                             mg/L       mg/L       mg/L   mg/L PO4   mg/L PO4


 NO. OF L-FLAGGED VALUES        0          0          0          4          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       27         15          6         23         28
 MEAN                         74.        38.        27.      0.229      0.545
 MINIMUM                       8.         5.         0.      0.020      0.040
 DATE OF MINIMUM       1980-11-17 1981-04-21 1980-02-19 1980-08-25 1980-11-17
 10TH PERCENTILE              14.         6.                 0.020      0.076
 MEDIAN                       40.        20.        26.      0.190      0.425
 90TH PERCENTILE             180.        81.                 0.396      0.909
 MAXIMUM                     225.       140.        65.      0.920      2.450
 DATE OF MAXIMUM       1981-08-26 1981-05-19 1980-05-19 1979-03-08 1980-02-19
 STANDARD DEVIATION           66.        40.        23.      0.221      0.554




                         SULPHATE         Cl         Ca   FAEC COL       INST
                                        DISS       DISS                DISCHG
                            16302      17203      20103      36011      97160
                         mg/L SO4    mg/L Cl    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       10         28         11         18          2
 MEAN                         26.        17.     75.364    4.1E+04       25.5
 MINIMUM                      18.         6.     56.000    1.1E+03           
 DATE OF MINIMUM       1979-03-08 1980-09-22 1980-03-24 1980-10-22           
 10TH PERCENTILE              18.         9.     56.000    1.9E+03           
 MEDIAN                       26.        17.     71.000    2.0E+04           
 90TH PERCENTILE              34.        24.     87.700    1.0E+05           
 MAXIMUM                      34.        40.    145.000    2.4E+05           
 DATE OF MAXIMUM       1980-03-24 1980-03-24 1979-06-05 1980-05-19           
 STANDARD DEVIATION            6.         7.     26.039    6.1E+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  - 1979-01-01 TO 1981-12-31
 PERIOD OF RECORD FROM  - 1979-01-31 TO 1981-12-09

 STATISTICS INCLUDE ALL FLAGGED DATA AS REPORTED


                            INTEG       TEMP       TEMP     N KJEL        NH3
                           SAMPLE                                            
                            00190      02061      02062      07004      07554
                              N/A      deg C      deg C     mg/L N     mg/L N


 NO. OF L-FLAGGED VALUES        0          0          2          0          9
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES        1         17         19         17         15
 MEAN                          1.       21.8        0.1        0.9       0.20
 MINIMUM                                15.1        0.0        0.5       0.05
 DATE OF MINIMUM                  1981-01-21 1981-05-29 1980-02-12 1980-02-12
 10TH PERCENTILE                        16.4        0.0        0.5       0.05
 MEDIAN                                 23.0        0.1        0.7       0.12
 90TH PERCENTILE                        24.5        0.2        1.7       0.32
 MAXIMUM                                25.0        0.4        2.5       1.10
 DATE OF MAXIMUM                  1981-09-02 1980-09-09 1981-06-30 1981-09-02
 STANDARD DEVIATION                      2.9        0.1        0.6       0.27




                               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       17         23         15         24         24
 MEAN                         6.7         2.        21.     201.38        8.8
 MINIMUM                      2.7         1.        10.      89.00        8.6
 DATE OF MINIMUM       1981-07-14 1979-10-31 1980-04-11 1980-04-11 1980-03-06
 10TH PERCENTILE              5.2         1.        10.     156.60        8.6
 MEDIAN                       7.0         2.        14.     205.00        8.8
 90TH PERCENTILE              7.5         3.        18.     238.00        9.0
 MAXIMUM                      7.7         4.       112.     263.00        9.0
 DATE OF MAXIMUM       1981-12-09 1981-11-13 1981-04-28 1980-07-29 1980-02-12
 STANDARD DEVIATION           1.1         1.        25.      35.76        0.1




                         SUSP SOL   SUSP SOL   VOL SUSP      PO4-P        PO4
                          105 DEG    180 DEG     SOLIDS        SOL      TOTAL
                            10401      10408      10511      15254      15403
                             mg/L       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       24         21          3         16         17
 MEAN                         16.         9.         3.      0.308      0.406
 MINIMUM                       1.         0.                 0.150      0.240
 DATE OF MINIMUM       1981-09-02 1981-05-29            1980-04-11 1980-02-14
 10TH PERCENTILE               5.         3.                 0.174      0.261
 MEDIAN                       14.        10.                 0.305      0.380
 90TH PERCENTILE              30.        15.                 0.390      0.497
 MAXIMUM                      44.        17.                 0.550      1.000
 DATE OF MAXIMUM       1981-12-09 1980-07-29            1981-12-09 1981-12-09
 STANDARD DEVIATION           11.         5.                 0.098      0.174




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


 NO. OF L-FLAGGED VALUES        0          0          0          6
 NO. OF G-FLAGGED VALUES        0          0          0          0
 NO. OF UNFLAGGED VALUES        7          2         16         17
 MEAN                         45.        22.     43.438        26.
 MINIMUM                       0.                21.400         3.
 DATE OF MINIMUM       1979-06-28            1980-03-06 1979-06-28
 10TH PERCENTILE                                 28.240         3.
 MEDIAN                       45.                36.000         3.
 90TH PERCENTILE                                 64.600        15.
 MAXIMUM                      79.                82.000       460.
 DATE OF MAXIMUM       1980-04-11            1980-12-23 1981-11-13
 STANDARD DEVIATION           24.                16.421        95.





 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  - 1979-01-01 TO 1981-12-31
 PERIOD OF RECORD FROM  - 1979-01-12 TO 1981-11-05

 STATISTICS INCLUDE ALL FLAGGED DATA AS REPORTED


                             ELEC       TEMP     N KJEL        NH3         O2
                             COND                                        DISS
                            02041      02061      07004      07554      08101
                            us/cm      deg C     mg/L N     mg/L N    mg/L O2


 NO. OF L-FLAGGED VALUES        0          0          4         16          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       28         29          0          2         29
 MEAN                        963.       18.6        0.1       0.13        7.7
 MINIMUM                     730.        4.0        0.1       0.05        1.7
 DATE OF MINIMUM       1979-09-18 1979-02-14 1980-08-09 1979-02-14 1980-04-07
 10TH PERCENTILE             804.        9.6                  0.05        4.9
 MEDIAN                      985.       19.0        0.1       0.05        7.8
 90TH PERCENTILE            1100.       27.1                  0.50       10.0
 MAXIMUM                    1100.       30.0        0.1       0.51       11.0
 DATE OF MAXIMUM       1980-01-08 1980-07-15 1981-11-05 1980-05-13 1980-02-18
 STANDARD DEVIATION           98.        7.1        0.0       0.17        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       25         28         30         30         22
 MEAN                          2.        20.     132.67        7.7        48.
 MINIMUM                       0.         3.      92.00        6.0         3.
 DATE OF MINIMUM       1980-10-08 1979-06-11 1979-07-09 1979-05-03 1979-10-10
 10TH PERCENTILE               1.         6.     120.00        6.0         4.
 MEDIAN                        2.        16.     127.00        8.1        12.
 90TH PERCENTILE               4.        44.     145.00        8.4        47.
 MAXIMUM                       6.        60.     237.00        8.5       654.
 DATE OF MAXIMUM       1981-02-11 1980-08-09 1980-02-18 1979-10-10 1980-11-04
 STANDARD DEVIATION            1.        16.      22.65        0.8       138.




                         SUSP SOL   VOL SUSP      PO4-P        PO4   SULPHATE
                          180 DEG     SOLIDS        SOL      TOTAL           
                            10408      10511      15254      15403      16302
                             mg/L       mg/L   mg/L PO4   mg/L PO4   mg/L SO4


 NO. OF L-FLAGGED VALUES        0          0         20         19          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       17          3          0          0         17
 MEAN                         13.         6.      0.020      0.020       193.
 MINIMUM                       1.                 0.020      0.020       100.
 DATE OF MINIMUM       1979-10-10            1979-01-12 1979-01-12 1979-01-12
 10TH PERCENTILE               2.                 0.020      0.020       144.
 MEDIAN                        5.                 0.020      0.020       197.
 90TH PERCENTILE              11.                 0.020      0.020       226.
 MAXIMUM                     123.                 0.020      0.020       243.
 DATE OF MAXIMUM       1979-09-18            1981-11-05 1981-11-05 1979-06-11
 STANDARD DEVIATION           29.                 0.000      0.000        32.





                               Cl         Ca       INST
                             DISS       DISS     DISCHG
                            17203      20103      97160
                          mg/L Cl    mg/L Ca       m3/S


 NO. OF L-FLAGGED VALUES        0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0
 NO. OF UNFLAGGED VALUES       30          3          1
 MEAN                        148.    115.333      158.0
 MINIMUM                      59.                      
 DATE OF MINIMUM       1980-04-07                      
 10TH PERCENTILE              99.                      
 MEDIAN                      110.                      
 90TH PERCENTILE             136.                      
 MAXIMUM                    1119.                      
 DATE OF MAXIMUM       1980-05-13                      
 STANDARD DEVIATION          185.                      





 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  - 1979-01-01 TO 1981-12-31
 PERIOD OF RECORD FROM  - 1979-01-16 TO 1981-11-30

 STATISTICS INCLUDE ALL FLAGGED DATA AS REPORTED


                             ELEC       TEMP     N KJEL        NH3         O2
                             COND                                        DISS
                            02041      02061      07004      07554      08101
                            us/cm      deg C     mg/L N     mg/L N    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       27         28          3          1         28
 MEAN                        933.       27.0        0.3       0.57        3.6
 MINIMUM                     480.       25.5                              1.0
 DATE OF MINIMUM       1981-11-30 1979-01-16                       1979-07-16
 10TH PERCENTILE             577.       25.9                              1.3
 MEDIAN                      990.       27.0                              3.8
 90TH PERCENTILE            1106.       28.0                              4.7
 MAXIMUM                    1180.       28.0                              5.9
 DATE OF MAXIMUM       1981-05-04 1981-06-01                       1980-11-24
 STANDARD DEVIATION          195.        0.6                              1.2




                              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       28         29         29         29         28
 MEAN                          3.        21.     305.86        7.8         9.
 MINIMUM                       1.         7.     184.00        7.0         2.
 DATE OF MINIMUM       1980-10-27 1981-01-07 1981-10-05 1981-05-04 1981-01-07
 10TH PERCENTILE               1.         8.     205.50        7.2         4.
 MEDIAN                        2.        16.     323.00        7.7         8.
 90TH PERCENTILE               4.        39.     352.10        8.5        14.
 MAXIMUM                       6.        66.     356.00        8.6        17.
 DATE OF MAXIMUM       1981-06-01 1979-05-28 1980-01-15 1979-02-28 1980-09-02
 STANDARD DEVIATION            1.        15.      49.75        0.5         4.




                         SUSP SOL   SULPHATE         Cl         Ca   FAEC COL
                          180 DEG                  DISS       DISS           
                            10408      16302      17203      20103      36011
                             mg/L   mg/L SO4    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       25          9         29         19         25
 MEAN                          6.        18.       149.     91.411      1645.
 MINIMUM                       1.         5.        42.     57.200        30.
 DATE OF MINIMUM       1981-01-07 1979-01-16 1981-10-05 1979-01-16 1981-05-04
 10TH PERCENTILE               2.                   51.     61.160        40.
 MEDIAN                        4.        18.       162.     98.000       400.
 90TH PERCENTILE               8.                  191.    107.700      4600.
 MAXIMUM                      34.        30.       194.    124.000     11000.
 DATE OF MAXIMUM       1979-01-16 1979-11-12 1981-08-04 1979-03-19 1981-08-04
 STANDARD DEVIATION            6.         8.        46.     18.569      3085.




                             FAEC
                            STREP
                            36101
                         No/100ml


 NO. OF L-FLAGGED VALUES        0
 NO. OF G-FLAGGED VALUES        0
 NO. OF UNFLAGGED VALUES       17
 MEAN                       6706.
 MINIMUM                      30.
 DATE OF MINIMUM       1981-10-05
 10TH PERCENTILE              37.
 MEDIAN                      400.
 90TH PERCENTILE            3060.
 MAXIMUM                  100000.
 DATE OF MAXIMUM       1981-06-01
 STANDARD DEVIATION        24072.





 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  - 1979-01-01 TO 1981-12-31
 PERIOD OF RECORD FROM  - 1980-02-13 TO 1981-09-10

 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          1          7         10
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES       11         12          0          0          2
 MEAN                        596.       30.0        0.0        0.0       0.06
 MINIMUM                     440.       27.0                   0.0       0.05
 DATE OF MINIMUM       1980-06-23 1981-06-15            1981-07-22 1980-03-25
 10TH PERCENTILE             444.       27.4                             0.05
 MEDIAN                      590.       30.0                   0.1       0.05
 90TH PERCENTILE             700.       31.0                             0.07
 MAXIMUM                     720.       31.0                   0.1       0.08
 DATE OF MAXIMUM       1981-07-22 1981-01-13            1981-06-15 1981-07-22
 STANDARD DEVIATION          101.        1.2                   0.0       0.01




                              COD        ALK        ALK         pH   SUSP SOL
                                       TOTAL      TOTAL               105 DEG
                            08301      10101      10102      10302      10401
                          mg/L O2       mg/L       mg/L   pH UNITS       mg/L


 NO. OF L-FLAGGED VALUES        5          0          0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES        5          5          7         12         12
 MEAN                          1.     317.60     279.00        7.4         2.
 MINIMUM                       0.     310.00     255.00        7.3         0.
 DATE OF MINIMUM       1980-04-21 1980-05-28 1981-01-13 1980-05-28 1981-01-13
 10TH PERCENTILE               0.                              7.3         0.
 MEDIAN                        1.     319.00     283.00        7.4         2.
 90TH PERCENTILE               2.                              7.5         3.
 MAXIMUM                       3.     321.00     300.00        7.7         7.
 DATE OF MAXIMUM       1980-03-25 1980-03-25 1981-03-24 1981-02-25 1980-02-13
 STANDARD DEVIATION            1.       4.34      16.67        0.1         2.




                            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        3          7          3          0          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES        0          2          2          5          7
 MEAN                       0.020      0.229         0.        20.        21.
 MINIMUM                               0.020         0.        20.        15.
 DATE OF MINIMUM                  1980-03-25 1980-03-25 1980-02-13 1981-02-25
 10TH PERCENTILE                                                             
 MEDIAN                                0.020         0.        20.        21.
 90TH PERCENTILE                                                             
 MAXIMUM                               1.760         0.        21.        22.
 DATE OF MAXIMUM                  1980-06-23 1980-02-13 1980-03-25 1981-09-10
 STANDARD DEVIATION                    0.575         0.         1.         3.




                               Ca         Ca       FAEC
                             DISS       DISS      STREP
                            20101      20103      36101
                          mg/L Ca    mg/L Ca   No/100ml


 NO. OF L-FLAGGED VALUES        0          0          3
 NO. OF G-FLAGGED VALUES        0          0          0
 NO. OF UNFLAGGED VALUES        5          5          5
 MEAN                     155.000     65.680         2.
 MINIMUM                  136.000     59.600         0.
 DATE OF MINIMUM       1980-06-23 1981-01-13 1980-02-13
 10TH PERCENTILE                                       
 MEDIAN                   156.000     65.200         2.
 90TH PERCENTILE                                       
 MAXIMUM                  168.000     70.000         5.
 DATE OF MAXIMUM       1980-05-28 1981-06-15 1980-04-21
 STANDARD DEVIATION        11.705      4.440         2.





 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  - 1979-01-01 TO 1981-12-31
 PERIOD OF RECORD FROM  - 1980-02-29 TO 1981-12-11

 STATISTICS INCLUDE ALL FLAGGED DATA AS REPORTED


                             ELEC       TEMP        ALK         pH   SUSP SOL
                             COND                 TOTAL               105 DEG
                            02041      02061      10102      10302      10401
                            us/cm      deg C       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       20         10         19         20          1
 MEAN                       1379.       25.0     205.21        7.6        96.
 MINIMUM                     980.       21.0     177.00        6.8           
 DATE OF MINIMUM       1980-11-26 1981-03-14 1980-07-18 1980-04-29           
 10TH PERCENTILE            1030.       21.0     177.00        7.0           
 MEDIAN                     1212.       25.8     207.00        7.6           
 90TH PERCENTILE            1400.       27.0     220.00        8.1           
 MAXIMUM                    4600.       27.0     223.00        8.2           
 DATE OF MAXIMUM       1980-10-23 1981-07-24 1980-04-29 1981-12-11           
 STANDARD DEVIATION          768.        2.2      14.53        0.4           




                         SULPHATE         Cl         Ca
                                        DISS       DISS
                            16302      17203      20103
                         mg/L SO4    mg/L Cl    mg/L Ca


 NO. OF L-FLAGGED VALUES        0          0          0
 NO. OF G-FLAGGED VALUES        0          0          0
 NO. OF UNFLAGGED VALUES        9         20         14
 MEAN                        453.        91.     71.100
 MINIMUM                     421.        23.     37.000
 DATE OF MINIMUM       1980-07-18 1981-04-10 1980-07-18
 10TH PERCENTILE                         76.     40.600
 MEDIAN                      452.        92.     59.150
 90TH PERCENTILE                         96.    101.100
 MAXIMUM                     506.       166.    136.000
 DATE OF MAXIMUM       1981-12-11 1980-06-17 1980-03-31
 STANDARD DEVIATION           29.        24.     28.512





 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  - 1979-01-01 TO 1981-12-31
 PERIOD OF RECORD FROM  - 1979-01-22 TO 1981-12-07

 STATISTICS INCLUDE ALL FLAGGED DATA AS REPORTED


                            INTEG       ELEC       TEMP       TEMP     N KJEL
                           SAMPLE       COND                                 
                            00190      02041      02061      02062      07001
                              N/A      us/cm      deg C      deg C     mg/L N


 NO. OF L-FLAGGED VALUES        0          0          0          6          0
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES        5         32         31         17          7
 MEAN                          1.      1634.       24.1        0.4        9.1
 MINIMUM                       1.       344.       17.0        0.0        1.9
 DATE OF MINIMUM       1981-02-25 1980-04-28 1979-01-22 1979-03-29 1980-05-21
 10TH PERCENTILE                        509.       20.1        0.0           
 MEDIAN                        1.      1252.       24.0        0.1        6.4
 90TH PERCENTILE                       2870.       26.0        0.6           
 MAXIMUM                       1.      4360.       30.0        3.2       26.7
 DATE OF MAXIMUM       1981-11-16 1979-11-21 1981-12-07 1979-10-17 1980-10-07
 STANDARD DEVIATION            0.      1119.        2.5        0.7        8.2




                           N KJEL     NO3NO2        NH3        NH3         O2
                                                                         DISS
                            07004      07105      07553      07554      08101
                           mg/L N     mg/L N     mg/L N     mg/L N    mg/L O2


 NO. OF L-FLAGGED VALUES        0          0          0          0         23
 NO. OF G-FLAGGED VALUES        0          0          0          0          0
 NO. OF UNFLAGGED VALUES        9          7          7         24         12
 MEAN                         9.6       1.07      42.71      45.34        0.7
 MINIMUM                      0.8       0.37       6.90       0.98        0.0
 DATE OF MINIMUM       1981-01-28 1980-05-21 1980-05-21 1979-04-25 1980-11-04
 10TH PERCENTILE                                              4.27        0.1
 MEDIAN                       8.5       0.71      55.10      24.55        0.1
 90TH PERCENTILE                                            117.00        2.4
 MAXIMUM                     19.7       2.04      60.30     198.00        2.8
 DATE OF MAXIMUM       1980-12-02 1980-10-07 1980-08-05 1979-11-21 1979-02-27
 STANDARD DEVIATION           6.8       0.72      22.35      55.01        1.0




                              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       29         35         34         35         34
 MEAN                         75.       208.     321.06        8.5       273.
 MINIMUM                       9.        38.     140.00        7.0        15.
 DATE OF MINIMUM       1979-03-29 1979-03-29 1981-05-20 1980-01-09 1980-05-21
 10TH PERCENTILE              10.        58.     164.20        7.6        40.
 MEDIAN                       51.       169.     275.00        8.5       100.
 90TH PERCENTILE             159.       372.     524.40        9.2       834.
 MAXIMUM                     225.       751.    1040.00        9.7      1760.
 DATE OF MAXIMUM       1980-11-04 1981-02-25 1981-11-16 1981-03-25 1980-09-04
 STANDARD DEVIATION           67.       161.     176.42        0.7       442.





                         SUSP SOL      PO4-P        PO4   SULPHATE         Cl
                          180 DEG        SOL      TOTAL                  DISS
                            10408      15254      15403      16302      17201
                             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        4         33         32         23          1
 MEAN                         71.      1.552      3.424       274.        32.
 MINIMUM                      35.      0.200      0.700        20.           
 DATE OF MINIMUM       1980-01-09 1981-05-20 1981-04-28 1979-08-14           
 10TH PERCENTILE                       0.526      0.926        53.           
 MEDIAN                       75.      1.240      2.235       131.           
 90TH PERCENTILE                       2.256      8.590       553.           
 MAXIMUM                     100.     10.050     13.000       882.           
 DATE OF MAXIMUM       1980-03-03 1979-09-18 1979-09-18 1980-06-03           
 STANDARD DEVIATION           31.      1.748      3.045       250.           




                               Cl         Ca         Ca   FAEC COL       INST
                             DISS       DISS       DISS                DISCHG
                            17203      20101      20103      36011      97160
                          mg/L Cl    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          2          0
 NO. OF UNFLAGGED VALUES       33          6         24         28          6
 MEAN                         89.     36.667     37.460    3.0E+05        5.2
 MINIMUM                       5.     30.400     13.600    1.1E+02        1.1
 DATE OF MINIMUM       1980-09-04 1980-05-21 1979-12-06 1979-07-18 1981-03-25
 10TH PERCENTILE              10.                24.528    4.6E+02           
 MEDIAN                       72.     35.000     35.950    1.8E+05        1.7
 90TH PERCENTILE             173.                51.600    1.0E+06           
 MAXIMUM                     239.     45.600     56.800    1.0E+06       14.3
 DATE OF MAXIMUM       1980-07-09 1980-06-03 1979-06-13 1979-10-17 1981-05-20
 STANDARD DEVIATION           64.      5.914     10.704    3.8E+05        6.0




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GEMS/WATER
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Last updated: 2001-07-30