Table 1. Monthly water-quality data collected at monitoring sites near the freshwater/saline-water interface of the Edwards aquifer, July 1996-December 1997
[Number in parenthesis refers to figure 1. SWTSU, Southwest Texas State University; median pH in standard units; T, mean temperature in degrees Celsius; SC, mean specific conductance in microsiemens per centimeter at 25 degrees Celsius; --, no data because of malfunctioning equipment.]
| Month | (1)
SWTSU research well
|
(2)
San Marcos Springs
|
(3)
Comal Springs
|
(4)
Atascosa municipal well
|
||||||||||||
| pH | T | SC | pH | T | SC | pH | T | SC | pH | T | SC | |||||
| July 1996 |
6.8 |
22.4 |
624 |
7.1 |
22.4 | 592 | -- | -- | -- | |||||||
| Aug. 1996 |
7.1 |
22.4 |
625 |
7.1 |
22.4 | 609 | -- | -- | -- | |||||||
| Sept. 1996 |
7 |
22.4 |
621 |
7 |
22.4 | 602 |
7.1 |
23.4 | 525 | |||||||
| Oct. 1996 |
7 |
22.4 |
624 |
7.1 |
22.4 | 610 |
7.1 |
23.4 | 524 | |||||||
| Nov. 1996 |
7 |
22.4 |
631 |
7.1 |
22.4 | 611 |
7.1 |
23.4 | 523 | Water-quality monitor | ||||||
| Dec. 1996 |
7.2 |
22.4 |
633 |
7 |
22.4 | 621 |
7 |
23.4 | 526 | not installed | ||||||
| Jan. 1997 |
-- |
-- |
-- |
-- |
-- | -- |
7.2 |
23.4 | 533 | until June 1997 | ||||||
| Feb. 1997 |
7.1 |
22.4 |
591 |
7.1 |
22.4 | 607 |
7.2 |
23.5 | 533 | |||||||
| Mar. 1997 |
7.1 |
22.4 |
592 |
7 |
22.4 | 606 |
7.2 |
23.4 | 539 | |||||||
| Apr. 1997 |
7.1 |
22.4 |
614 |
7.2 |
22.4 | 602 |
7.1 |
23.4 | 538 | |||||||
| May 1997 |
7.2 |
22.3 |
618 |
7.2 |
21.5 | 608 |
7.5 |
23.5 | 534 | |||||||
| June 1997 |
7.1 |
22.4 |
611 |
7.2 |
20.8 | 609 |
7.6 |
23.5 | 532 | -- |
27 |
575 | ||||
| July 1997 |
7 |
22.2 |
601 |
7.1 |
20.5 | 606 |
7.1 |
23.5 | 530 |
7 |
27.6 |
624 | ||||
| Aug. 1997 |
7 |
22 |
604 |
7.1 |
20.6 | 607 |
7.5 |
23.5 | 533 |
7.1 |
27.6 |
630 | ||||
| Sept. 1997 |
6.9 |
21.9 |
610 |
7 |
20.6 | 608 |
-- |
23.5 | 531 |
7 |
27.6 |
620 | ||||
| Oct. 1997 |
7 |
21.8 |
615 |
7 |
20.4 | 610 |
7.2 |
-- | -- |
7.2 |
27.4 |
630 | ||||
| Nov. 1997 |
6.9 |
21.8 |
619 |
7.1 |
20.4 | 612 |
6.8 |
-- | -- |
7.2 |
27.3 |
630 | ||||
| Dec. 1997 |
7 |
21.9 |
621 |
7 |
20.4 | 614 |
7.2 |
23.5 | 511 |
6.9 |
27.3 |
627 | ||||
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