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• • <br />c° <br />C-48-1176-01-0 <br />Project No. <br />ENVIRONMENTAL ASSESSMENTS OF <br />APPLICANT, CLEARINGHOU5ES, AND STATE AGENCY <br />Harris <br />Texas <br />ty <br />Part 1 APPLICANT'S ASSESSMENT <br />Section I Description of Proposed Action <br />Background - The City of La Porte owns and operates two sewage treatment <br />plants. One is the main plant in La Porte proper, located at 5th Street <br />and K Street. The other plant is located in and serves the Fairmont Park <br />Subdivision. This plant was originally built and operated by Texas Water <br />Control and Improvement District No. 56 which was comprised of the Fairmont <br />Park Development. This development was annexed by the City of La Porte in <br />December 1969 at which time the city assumed the bonded indebtedness of the <br />water district and took over the operation and maintenance of the sewage <br />treatment plant. <br /> <br />Fairmont Park Plant - The Fairmont Park plant is a trickling filter design <br />with a present design capacity of .58 mgd. The original design provides <br />for duplicating the existing components to create an ultimate capacity of <br />1.16 mgd. The present load on the facility is about one half the existing <br />capacity or .227 mgd. This plant operates under Texas Water Quality Board <br />(TWQB) WCO No. 10206 and is also subject to TWQB Order No. 74-0122-2 re- <br />lating to discharges in the Clear Lake watershed. The following chart <br />shows the quality of treatment achieved: <br />Influent Effluent___ TWQB Re <br />Flow, Avg. mgd ."lZ/ .LL/ .StsU <br />Flow, Peak mgd 1.160 1.160 1.160 <br />BOD, mg/1 157 10.5 5 <br />Chlorine, mg/1 @ 20 min. 0 2.0 1 <br />TSS, mg/1 168 8.25 12 <br />Phosphorus as P, mg/1 Unknown 72 2 <br />As can be seen this plant falls short of the 7WQ6 Order No. 74-0122-2 <br />requirements in two critical areas, BOD and phosphorus. Because of these <br />parameters set by TWQB Order No. 74-0122-2 and the inability of the <br />Fairmont Park plant. to meet them, along with other valid reasons mentioned <br />below, it is proposed in this federal grant to abandon this plant and <br />divert all flow to the main La Porte plant. <br />Main La Porte Plant - The main La Porte plant operates as an activated sludge <br />process an prove es adequate secondary treatment for normal sewage flows. <br />During periods of high rainfall it is known that large amounts of raw sewage <br />and storm water are bypassed to the receiving waters, Galveston Bay via <br />r~ <br /> <br />