Texas 2000
Clean Water Act
Section 303(d) List in Study Area
Draft (August 31, 2000)
| Explanation of Column Headings |
Source: The Texas Clean Rivers Program,
TNRCC web site |
| Segment Number |
Segment Name |
Overall Priority |
Basin Group |
Source |
Parameters of Concern |
Segment Summary |
| PS |
NPS |
| 1209A |
Bryan Municipal Lake (unclassified water body in northwest
Bryan in Brazos County, also called Country Club Lake) |
M |
D |
Y |
. |
toxicity in ambient sediment, arsenic in water |
Significant effects in ambient sediment toxicity tests
sometimes occur, indicating that conditions are not optimum
for aquatic life (L/NS). The average arsenic concentration
in water exceeds the human health criterion for water
and fish (M/NS). This criterion was established to protect
consumers from bioaccumulation of toxicants in fish tissue. |
| 1209B |
Fin Feather Lake (unclassified water body in northwest
Bryan in Brazos County) |
M |
D |
Y |
. |
toxicity in ambient sediment, arsenic in water |
Significant effects in ambient sediment toxicity tests
sometimes occur, indicating that conditions are not optimum
for aquatic life (L/NS). The average arsenic concentration
in water exceeds the human health criterion for water
and fish (M/NS). This criterion was established to protect
consumers from bioaccumulation of toxicants in fish tissue. |
| 1209C |
Carters Creek (unclassified water body southeast of
College Station in Brazos County) |
L |
D |
Y |
Y |
pathogens |
Bacteria levels sometimes exceed the criterion established
to assure the safety of contact recreation (L/NS). |
| 1209D |
Unnamed tributary to Bryan Municipal Lake (unclassified
water body in northwest Bryan, Brazos County) |
M |
D |
Y |
. |
arsenic in water |
The average concentration of arsenic in water exceeds
the human health criterion for water and fish (M/NS).
This criterion was established to protect consumers from
bioaccumulation of toxicants in fish tissue. |
| 1210 |
Lake Mexia |
L |
D |
. |
Y |
depressed dissolved oxygen |
Dissolved oxygen concentrations are sometimes lower
than the criterion established to assure optimum conditions
for aquatic life (L/NS). |
| Explanation
of Column Headings: |
| Segment Number: |
This is the classified segment number assigned
to a water body or portion of a water body in the Texas
Surface Water Quality Standards. A letter designation
following the segment number (such as "A" or "B") indicates
an unclassified water body that is located within the
watershed of the classified segment whose number is shown
before the letter. |
| Segment Name: |
The name of the water body. |
| Overall Priority: |
The overall priority rank of the water body
for TMDL development is shown in this column. If there
are multiple impairments, the highest rank assigned for
an individual pollutant becomes the overall rank. However,
in the case of international/interstate waters, the overall
rank will usually be low (because of the uncertainty associated
with obtaining interstate/international collaboration
in TMDL development), regardless of the rank of individual
pollutants.
Impaired waters: H = high; M = medium; L = low.
Threatened waters: T-h = threatened-high; T-m = threatened-medium. |
| Basin Group: |
Letter code (A - E) indicates which group
of river basins the segment is associated with in the
TNRCC basin planning cycle.
Group A - Canadian River, Red River, Sulphur River, Cypress
Creek, Sabine River, Sabine Pass, Neches River
Group B - Trinity River
Group C - San Jacinto River, Neches-Trinity Coastal, Trinity-San
Jacinto Coastal, San Jacinto-Brazos Coastal, Bays and Estuaries
Group D - Brazos River, Brazos-Colorado Coastal, Lavaca
River, Colorado River, Bays and Estuaries
Group E - Guadalupe River, San Antonio River, Rio Grande,
Nueces River, San Antonio-Nueces Coastal, Colorado-Lavaca Coastal,
Lavaca-Guadalupe Coastal, Nueces-Rio Grande Coastal, Bays and Estuaries,
Gulf of Mexico |
| Source: |
A "Y" indicates that the impairment is from
point sources (PS) or nonpoint sources (NPS). This includes
unknown and/or potential point or nonpoint sources. |
| Parameters of Concern: |
Those pollutants or water quality conditions
for which screening procedures indicate an existing impairment,
or a threat of impairment within the next two years. |
| Segment Summary: |
The priority level for each pollutant is
shown in parentheses, as in the overall priority column
(H=High, M=Medium, etc.). Following the priority level
will be the designation "NS" for water bodies that are
not supporting their uses as designated in the Texas Surface
Water Quality Standards, or the designation "PS" for water
bodies that are partially supporting their designated
uses. For water bodies listed for nonattainment or partial
attainment of numeric or narrative criteria designed to
safeguard general water quality, the designation "CN" for
criteria not supported, or "CP" for criteria partially
supported, will follow the priority ranking. |
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