Use of In-Stream Water Quality Measurements and Geospatial Parameters to Predict Consumer Surfactant Toxic Units in the Upper Trinity River Watershed, Texas Page: 14
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effluent discharge (Figure 2-2). In fact, DFW WVVTP effluents were lower than most of
the upstream surface water samples. Furthermore, addition of WVVTP effluent into the
Trinity River did not result in increased SVVTU. Figure 2-2 (upper panel) shows that
most sites downstream of WVVTPs actually had a decrease in SWTU. This trend was
counter to what we had anticipated of surfactants increasing downstream VVTP
effluent discharge and a gradual increase in SVVTU as the Trinity River flowed through
DFW. Of interest was the fact that SWTU were actually higher upstream and
downstream of DFW. The highest SWTU were located at Sample Sites 1 (total SVWTU
= 0.1174), 12 (total SVVTU = 0.1136), and 15 (total SWTU = 0.1394).
Sample site 1 was located near the headwaters of Clear Creek in a very rural
region of the watershed. Very few residences were located near this sample site.
However, most homes in this region used septic sewer systems. It is possible that there
were direct and indirect discharges of septic waste into upstream waters from Sample
Site 1. In addition, there was a local quarry located approximately 1 mile upstream of
Sample Site 1 (Figure 2-4). It was possible that there was some sort of point source
industrial discharge of surfactants used in quarry operations. It was also possible that
the quarry used a septic sewer system that seeped into the nearby upstream waters.
Sample Site 12 was located on the east side of DFW, which is still very rural,
primarily agricultural, region of the state (see Chapter 3 below). It was possible that
agricultural products used on crops, such as fertilizers or pesticides, resulted in non-
point source discharge of surfactants into the streams and rivers. In addition, the
increase in agriculture land being converted to residential land use meant that local
WVVTPs might have received more surfactants than in the past. Thus, it was possible14
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Johnson, David Richard. Use of In-Stream Water Quality Measurements and Geospatial Parameters to Predict Consumer Surfactant Toxic Units in the Upper Trinity River Watershed, Texas, thesis, May 2008; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc6091/m1/30/: accessed May 1, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .