1975-01-20 Regular Meeting - Laserfiche WebLink

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~• • `' Little Cedar Bayou. An infiltration/inflow evaluation survey now complete and the accompanying cost/effective study have resulted in a recommendation that both plant modifications and collection system repair should be undertaken to solve this problem. This plant has a design flow (average daily) in its present state of 0.73 mgd. This plant is also subject to TWQB WCO No. 10206 for effluent quality. The TWQB WCO 74-0122-2 does not apply to it. Representative data for the plant influent and effluent are given in the following table: Item ~ influent Effluent TWQB Regmts._ Flow, Avg. mg --- -.622 .622 .730 Flow, Peak mgd 1.805 1.805 1.805 B00, mg/1 66 10.25 20 Chlorine, mg/l @ 20 min. 0 1.9 1 TSS, mg/1 59 5.5 20 The capacity of the main plant is clearly less than enough to handle the combined flows of Fairmont Park and La Porte proper. Considering future growth and the need for high quality effluent it is proposed to expand this facility.. Proposed Plant - The expanded plant is proposed to be an activated sludge process, with aerobic digestion, designed for a capacity of 2.5 mgd to handle loads to 1985. Provisions are planned to allow a second phase of expansion'to 4.1 mgd to meet requirement to the year 2000. The plant, after its initial expansion, will provide secondary treatment and provide the quality effluent shown below: • Item Influent Effluent Flow, Avg. mgd 2.5 2.5 Flow, Peak mgd 3.8 3.8 BOD, mg/1 96 20 Chlorine, mg/1 0 1 TSS, mq/l 96 20 The City acquired a 4.143 acre tract adjacent to their existing plant in 1973, anticipating the need for improvement and expansion. Since in the expansion, portions of the existing plant will be reused this amount of land is more than adequate. The excess land will provide a large amount of buffer area, although the surrounding properties are undeveloped at this time. In view of the type of treatment process, which is one that produces little or no odor problems, and the amount of buffer available, no special units are planned for the facility. Line Work - The proposed line work associated with this project is shown on the attached aerial photo (Exhibit A) which also shows the location of the proposed facilities in relation to developed areas and public access areas. The large lines from Fairmont Park to the main plant are necessary to divert flow from the Fairmont Park plant to the expanded main plant. The 18 inch line to the east and northeast will be a new interceptor through an existing residential area. Also shown are future lines designed to handle projected growth in the City's undeveloped areas and a 12 inch interceptor now under construction. All the lines proposed in this project