Sabine River Authority of Texas

Date: 6/5/98

To: Interested Parties

From: Environmental Services

RE: Water Quality Monitoring Report

Please find attached the Sabine River Authority Water Quality Report for May 1998. Water quality sampling was performed on May 11th through May 14th. Weather during the month can be characterized as warm and very dry throughout the basin.

Upper Basin Section (Above Toledo Bend)

Most values are consistent with water of high quality. Several sites in the Upper Basin had dissolved oxygen percent saturation values that were slightly elevated indicating some alga activity. LT23A had the highest value at 128, the chlorophyll a value at this site (74.5 m/L) was also elevated which indicates higher than normal alga activity. Lake Tawakoni and Lake Fork sites are showing signs of stratification. An unusually high value for conductivity at BS18 indicates a possible oilfield saltwater spill. This is still under investigation

Lower Basin Section (Toledo Bend to Ruliff)

Dissolved Oxygen and dissolved oxygen percent saturation values were within normal ranges with two exceptions. TB6N which had lower than normal values and TB6L which had higher than normal values indicating alga activity. Fecal coliform numbers were also low at all Lower Basin sites. Conductivity values at BA4 and SR2 were slightly elevated most likely a result of the low flow conditions. The Ammonia value at TB6N was elevated possibly due to the wastewater treatment facility outfall upstream of this site. Most lake sites at Toledo Bend are now stratified. Most secchi disk numbers were high throughout the basin indicating good water transparency. Bayou Anacoco had the lowest secchi disk value, turbidity was also the highest at this location. Sulfate was also elevated at this site.

 

Tidal Section (Below Morgan Bluff)

Values for stations in the tidal portion of the Sabine Basin were in a range that was normal and consistent with waters of high quality. The tide was rising during this sampling and flow was moving eastward in the Intercoastal Waterway. The salinity levels detected at four of the five locations in the Tidal Area of the Basin were a reflection of the low flow conditions and tidal influence at these stations. The highest surface salinity (7ppt) was at SRT1. Conductivity, total Hardness, chloride, and sulfate were also higher at these sites due to the saltwater intrusion. ICW1 showed at high value (1.75mg/L) for Nitrate & Nitrite.

Additional data for these monitoring stations is available on our World Wide Web site (www.sra.dst.tx.us). If you have any questions or comments concerning this report please contact: