To: Interested Parties

From: Water Resources Branch

RE: August 2006 monthly Water Quality Report

This is the Sabine River Authority Water Quality Report for August 2006. Water quality sampling was performed August 7th through August 10th. Recent weather (previous seven days) in the Sabine River Basin was hot, with daytime highs in the low 90s to low 100s at Lake Tawakoni and at Lake Fork. Toledo Bend Reservoir and Orange had daytime highs from the mid 80s to the mid 90s. Lows ranged from the mid 60s to upper 70s at Lake Tawakoni and at Lake Fork. Toledo Bend and Orange had lows ranging from the upper 60s to the mid 70s. During the 28 days prior to the sample run, the Upper Basin received 0.17 and 0.07 inches of rainfall as recorded at Lake Tawakoni and at Lake Fork, respectively. Lake Tawakoni received 0.14 inches of rain and Lake Fork did not receive any precipitation the week preceding the sample run. Toledo Bend and Orange received 1.98 and 6.49 inches of precipitation during the 28 days prior to the sample run.

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

Water quality parameter measurements at the Upper Basin sites were consistent with water of high quality for the August sample run. The level of Lake Fork was recorded at 399.15 feet msl with 21 cfs releases and the level of Lake Tawakoni was recorded at 428.78 feet msl with 6 cfs releases at the time of sampling. Station LT23C exceeded the stream standards numeric criteria for pH. Station SR22 fell below the stream standards numeric criteria for dissolved oxygen. Lower dissolved oxygen levels may occur in the early morning hours, low stream flows, warmer temperatures, and with the decomposition of organic material. Stations LT23A, LF4, SR22, and SR19 exceeded the recommended screening criteria for chlorophyll a. LT23D exceeded the recommended screening criteria for ortho-phosphate. Station SR11 and SR10 exceeded the stream standards numeric criteria for sulfate. Station SR10 also exceeded the stream standards numeric criteria for chloride. All reservoir and stream sites were within the stream standards numeric criteria for E. coli.


Lower Sabine Basin Including Toledo Bend to Morgan Bluff

The August monthly sampling results were indicative of water of high quality at most sites. The area received 0.48 inches of rainfall during sampling and the week prior. The level of Toledo Bend Reservoir was recorded at 164.21 feet msl with 204 cfs discharge at the time of sampling. Most reservoir stations were stratified with dissolved oxygen and temperature differences throughout the water column. Anoxic conditions were found at several lake stations at their deepest depths. The stream standards numeric criteria were exceeded at station TB6R for pH, and at station TB8 for sulfate. The screening criteria were exceeded at stations TB6R, and TB6H for chlorophyll a.

Tidal Section of the Sabine Basin below Morgan Bluff

Most sites sampled in the Tidal portion of the Sabine Basin had values that are consistent with water of high quality. The Tidal stations received 1.28 inches of rainfall in the seven days prior to the sample event. Surface salinities were found at only two of the Tidal stations. The largest salinity value, 8 ppt, was found at station SRT1 at a depth of 10.1 meters. All the parameters measured fell within the stream standards numeric criteria.

 

This Report and additional data for these monitoring stations are available on our World Wide Web site (www.sratx.org). If you have any questions or comments concerning this report, please contact:

 

      Upper Sabine Basin
Terry Wilson, Upper Basin Field Office Coordinator
903-878-2420 (twilson@sratx.org)

      Lower and Tidal Sabine Basin
Jerry Wiegreffe, Lower Basin Field Office Coordinator
409-746-3284 (jwiegreffe@sratx.org)

      If above are unavailable
John Payne, Special Projects Administrator
409-746-2192 (jpayne@sratx.org)
or
Miles Hall, Environmental Services Division Manager
409-746-3284 (mhall@sratx.org)

 

Printed Tuesday, January 09, 2007 at 08:28