To: Interested Parties
From: Environmental Services division
This is the Sabine River Authority Water Quality Summary for November 2000. Water quality sampling was performed November 14th through November 16th. The Upper Basin received 10-13 inches of rainfall during the past 30days as recorded at lakes Tawakoni and Fork. Toledo Bend and Orange received 7.8 and 3.7 inches respectively during the same period. Recent runoff contributed to elevated fecal coliform and high turbidity values in the Upper Basin. Daytime-high air temperatures were in the 40's and 50's in the Upper Basin and in the 50's and 60's in the Lower Basin. Lows were in the 30's and 40's. Temperature and dissolved oxygen profiles indicate the reservoirs were not thermally stratified and will continue to mix until extended periods of warm weather.
Upper Sabine Basin Above Toledo Bend Including Lake Fork and Lake Tawakoni
For the November sample run, most of the water quality values seen at the Upper Basin sites were consistent with water of high quality. Lake Fork and Tawakoni reservoirs were completely mixed. Most of the Upper Basin river sites had elevated fecal coliform bacteria counts, not unusual after heavy rains. Fecal streptococcal bacteria were also elevated at the same sites as supporting evidence that the high bacterial counts are from non-human sources. However, fecal coliform counts at the reservoir sites were compliant with stream standards. One site at Lake Tawakoni (LT23D) had slightly elevated chlorophyll a and one Lake Fork Reservoir site (LF2) had slightly elevated nitrate/nitrite.
Lower Sabine Basin Including Toledo Bend to Morgan Bluff
November WQM sampling results were indicative of water of high quality at most sites. The amount of rainfall increased in the area but Toledo Bend Reservoir levels were still below maximum pool level. Deep-water stations sampled on the reservoir were well mixed and did not exhibit thermal stratification. Sites TB6N and TB6M had oxygen levels that were below stream standards. Elevated conductivity readings, fecal coliform counts and chloride levels were observed at Station TB6N. TB6N is located downstream from a municipal wastewater treatment plant. Elevated conductivity readings and higher nitrate/nitrite, sulfate and chloride levels were observed at Station BA4. Station BA4 is sampled from a bayou that receives discharge from a paper mill.
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. Stations AB7 and CB4 had oxygen readings that were below stream standards. Fecal coliform standards were exceeded at four stations: AB7, AB2, CB4, and CB1. Salinity was detected at six tidal stations: AB2, CB1, SRT1, AB7, BB1 and ICW1. The greatest salinity reading of 21 ppt was observed at the deepest depth at Station SRT1. Deep water stations sampled exhibited thermal stratification with a definite salt-water wedge at river tidal stations SRT1 and SRT2.
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
Cynthia Darbonne, Lower Basin Field Office Coordinator
If above are unavailable
Miles Hall, Environmental Services Assistant Division Manager
Printed Friday, February 02, 2001