Addendum to Regional Water Supply Facilities Plan Final Report (April 2011) Page: 6-1
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APRIL 2011
Treatment Process
EvaluationThere are a number of factors that must
be considered in evaluating and selecting
a drinking water treatment process,
including untreated water quality
(contaminants in the water), drinking
water standards, size of treatment
system, strengths and weakness of each
process unit, and long-term costs.
Source Water Quality
The water treatment process to be
chosen greatly depends on the number
and type of contaminants or aesthetic
problems of the source water. For the
purpose of this project, water quality
samplings were performed at four (4)
locations along the drainage ditches
where proposed project sites were
located to acquire untreated raw base
flow water quality information. The
four sampling locations are illustrated in
Figure 6-1.
The collected water samples were tested
at each project site to determine the
levels of various contaminants in the
untreated source water. Table 6-1.
summarizes the results of water
sampling and analysis results are five (5)
water quality parameters were identified
to be key in evaluating and selecting the
water treatment processes, including
TDS, Hardness, Sodium, Sulfate, and
TOC.
A brief description to each of the five
parameters is given below.Total Dissolved Solids (TDS)
The TDS concentrations, varying among
the four sampling locations, are 2000
mg/L, 1700 mg/L, 1600 mg/L, and 1900
mg/L respectively at Location 1,
Location 2, Location 3, and Location 4.
TDS does not have a set Maximum
Contaminant Level (MCL) and is
therefore not regulated by the
Environmental Protection Agency
(EPA). A Secondary MCL of 500 mg/L
is set for TDS, but it is not an
enforceable limit.
The raw water from the drainage ditch is
considered moderately brackish.
Brackish water generally has a TDS
concentration of 1,000-10,000 mg/L.
Water is considered fresh when its TDS
concentration is below 500 mg/L.
Hardness
The hardness concentrations are 600
mg/L as CaCO3, 520 mg/L as CaCO3,
610 mg/L as CaCO3, and 570 mg/L as
CaCO3 respectively at Location 1,
Location 2, Location 3, and Location 4.
The raw water is considered very hard
based on classification by the U.S.REGIONAL WATER SUPPLY FACILITIES PLAN
6
6-1
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Civil Systems Engineering, Inc. Addendum to Regional Water Supply Facilities Plan Final Report (April 2011), report, May 2011; Houston, Texas. (https://texashistory.unt.edu/ark:/67531/metapth839161/m1/147/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.