To: Interested Parties
From: Environmental Services division
This is the Sabine River Authority Water Quality Summary for October 2001. Water quality sampling was performed October 9th through October 11th. Recent weather was mild with relatively dry conditions. The Upper Basin received 2.54 - 4.62 inches of rainfall during the 28 days since the previous sample run as recorded at Lake Tawakoni and Lake Fork respectively. Toledo Bend and Orange received 1.87 and 3.10 inches respectively during the 28 days preceding the sample run. Recent daytime high temperatures were in the 70's and 80's throughout the Sabine Basin. Nighttime lows were in the 40's and 50's north of the Orange area where lows were in the 50's and 60's. Reservoirs were thermally stratified only at the deepest sites.
Upper Sabine Basin Above Toledo Bend Including Lake Fork and Lake Tawakoni
For the October sample run, most of the parameter values seen at the Upper Basin sites were consistent with water of high quality. One Upper Basin site (LT23C) had 102% saturation of dissolved oxygen, indicating algal bloom conditions. Bacteriological counts were within stream standards at all but two Upper Basin sites. SR17 and SR16 exceeded stream standards for E. coli. High values for E. coli are unusual during dry weather with no rainfall runoff so calls were made to local cities to alert them of a possible wastewater leak in the area. A leaking wastewater main was identified and repaired. Lake Fork Reservoir was mixed at the shallower sites but was thermally stratified at 13 meters at LF2 near the dam. Lake Tawakoni was mixed at all sites.
Lower Sabine Basin Including Toledo Bend to Morgan Bluff
The October monthly sampling results were indicative of water of high quality at most sites. Toledo Bend Reservoir was well below pool level at the time samples were taken. The reservoir was being kept at approximately 163 feet so repairs could be performed on the dam. Thermal stratification of the water profile was exhibited at most stations. Anoxic conditions were only observed at the deep-water stations at the deepest depths. Station TB6N had a dissolved oxygen reading that was below stream standards. Station TB6M had an E.coli result that was above stream standards, and station BA4 had a Sulfate result that was above stream standards. Two stations on the reservoir were not sampled this month. Station TB6L was not sampled because of the low water conditions in the reservoir, and station TB6S was not sampled due to releases from the spillway.
Tidal Section of the Sabine Basin below Morgan Bluff
Stations sampled in the tidal portion of the Sabine Basin had values that were consistent with water of high quality at most sites. All values for the tidal sites were within the stream standards for this segment of the basin. All sites were also well mixed at all depths. Salinity readings were recorded at all tidal stations. The highest salinity reading was recorded at the deep-water station SRT1. This station had a value of 12 ppt at a depth of 10.2 meters.
This Report and additional data for these monitoring stations are available on our World Wide Web site (www.sra.dst.tx.us). If you have any questions or comments concerning this report, please contact:
Ø Upper Sabine Basin
John Payne, Upper Basin Field Office Coordinator
Ø Lower and Tidal Sabine Basin
Jerry Wiegreffe, Lower Basin Field Office Coordinator
If above are unavailable
Miles Hall, Assistant Division Manager Environmental Services
Printed Thursday, January 10, 2002