11 - Wastewater Treatment Plant Engineering Services

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2. Conceptual Design Report The conceptual design phase submittal will include a Conceptual Design Report and a conceptual phase opinion of probable construction cost. This conceptual submittal will be for the purpose of coordinating the proposed improvements with the City, the Texas Commission of Environmental Quality (TCEQ) and the Texas Water Development Board (TWDB) and to develop an order of magnitude cost estimate for the project. Major elements of the Engineering Report will include the following facility or process evaluations: • All elements as listed in the "General' section of this Scope of Services. • Conceptual design report will include likely future limits (based on discussions with TCEQ) for phosphorus/nitrogen as well as identification of current or future process improvements necessary to meet these likely future limits. • Hydraulic Grade Line (HGL) determination throughout the treatment processes from the WWTP influent to the WWTP outfall. • Evaluate solids handling operation and propose options for a new solids treatment train utilizing existing infrastructure where possible. • Evaluate the benefits of maintaining any existing pump stations for future use. • Design of a new Activated Sludge System. - Develop a layout for a new fine bubble diffused air secondary treatment train using conventional activated sludge. - Evaluate nutrient removal requirements in future TPDES permit. - Evaluate improved primary treatment to offset additional aeration basin capacity. • New RAS/WAS pump station capacity evaluation. - Evaluate potential for a new RAS/WAS pump station. • New Aeration Capacity Evaluation. - Consider the use of existing tankage for future aeration capacity. • New Digestion Evaluation. - Consider the use of existing tankage for renovation to new digesters. • New Backup Power Generator System for critical processes. • Evaluate SCADA system and determine necessary improvements. 2.1. Historical Data Review Garver will collect and review relevant information including: • As -built drawings of each facility • Previous applicable studies and reports • Process data and daily monitoring reports for a three year period • Equipment maintenance records and Operations and Maintenance (O&M) manuals • Develop sampling plan 2.2. Flow Projections/Load Projections This sub task will evaluate existing flow rates and compare to existing sewer service population within the City. The flow rates will then be compared to a 20 year population projection for a complete 20 -year planning horizon flow projection, as required by TWDB. The existing wastewater will be characterized by the City under the direction of Garver. These sample parameters will be utilized in projecting future loading rates for processes. This is anticipated to include multiple samples, with the analysis of each sample including BOD, Soluble BOD, COD, Soluble COD, TSS, NH3, Total Phosphorus, Soluble Phosphorus. The City will conduct all sampling, analysis, and pay for lab fees if needed. Garver will deliver a Memorandum documenting the findings of the flow and load projections. Deliverable will be Adobe PDF documents sent electronically. Appendix A - Scope of Services 2 of 5 City of Paris WWTP Improvements