Sabine River Authority of Texas

Date: 5/27/99

To: Interested Parties

From: Environmental Services

RE: DECEmber 1998 Water Quality Monitoring Report

This is the Sabine River Authority Water Quality Report for December 1998. Water quality sampling was performed December 8 through December 10. Weather during December Water Quality Monitoring can be characterized as cool and windy throughout the Basin. A cold front moved through the Basin bringing cooler temperatures, strong winds and some rain just prior to Water Quality Monitoring (WQM). Heavy rains occurred several days after the December WQM. However, rainfall can be characterized as moderate when compared to recent years.

Upper Sabine Basin Above Toledo Bend Including Lake Fork and Lake Tawakoni

Most of the parameters’ values seen in the Upper Basin sites are consistent with water of high quality. All of the sites sampled on Lake Fork and Lake Tawakoni had uniform temperature and dissolved oxygen levels from surface to bottom indicating complete mixing of the water column. Very windy conditions were recorded on the day reservoir samples were taken. This lead to turbidity values much higher and secchi disk transparency depths much shallower than normally seen at lake stations. Fecal coliform bacteria were also elevated above the 200 colonies/100 ml stream standard. All Upper Basin river sites exceeded the fecal coliform stream standard. High to out-of-banks river levels indicate surface runoff is the source. Conductivity was unusually low at SR21. Upper Basin river sites seldom drop below 100 mS/cm, especially SR21, which is downstream from some natural salt deposits in Grand Saline.

Lower Sabine Basin Including Toledo Bend to Morgan Bluff

This area of the Basin received the most rainfall for December; however, most of it occurred after the WQM. Values measured during the December WQM in the Lower Basin were within normal ranges for this time of year. One location, TB6N, had a dissolved oxygen value below stream standards. Some sites in the Lower Basin demonstrated elevated turbidity, fecal coliform (FC), fecal streptococcus (FS) and low pH values. Station TB6N, TB6M TB6L TB6J, TB6K, TB6F and SR5 also had low FC/FS ratios. This indicates that fecal contamination is from animal sources. Station BA4 had a sulfate value (50.4 mg/L) value much higher than stream standards (25 mg/L). This is likely related to oil field activities in that area. Main lake sites demonstrated values associated with high water quality for all parameters. No thermal stratification was noted at any locations on Toledo Bend.

 

Tidal Section of the Sabine Basin below Morgan Bluff

Values for stations in the tidal portion of the Sabine Basin were also consistent with waters of high quality. No values in the tidal area of the Basin were outside of stream standards. Salinity was detected at two of the five sites in this section of the Basin.

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: