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2.3. Field Investigation <br />Garver will evaluate the existing wastewater treatment facilities, including existing liquid process treatment <br />units and solids handling. This assessment will include multi -discipline engineers (Mechanical, Civil, <br />Electrical, and Process) completing a visual assessment for condition based items to determine which <br />processes can be reused for the other processes for the rehabilitation. <br />2.4. Structural Investigation <br />Garver will perform a visual structural analysis of the existing concrete structures which will be affected <br />by this improvements project. This concrete analysis will assess the structural integrity of the existing <br />concrete structures at the WWTP based on at -grade visual observations and record drawings of the <br />existing structures. While the structural investigation will focus on the existing aeration basins, other major <br />concrete structures at the WWTP will also be reviewed. <br />2.5. Existing System Assessment <br />Garver will perform a facility compliance check to confirm conformance with TCEQ Chapter 217 rules. <br />Garver will also identify any flood plain concerns for the site. <br />2.6. Hydraulic and Process Modeling <br />Garver will perform hydraulic modeling of the existing facility. Modeling will be done utilizing a static model <br />and record drawings. A determination of the boundary conditions of the hydraulic model will be developed. <br />Garver will perform process modeling using GPS -X. A process model of the existing facility will be <br />developed and calibrated. Two alternatives will be evaluated, based on a conventional activated sludge <br />facility. The process modeling will also consider future nutrient removal regulations. <br />2.7. Alternatives Evaluation <br />Garver will conduct a detailed evaluation of up to two process alternatives. Detailed evaluation will include <br />development of design parameters (e.g., equipment sizing criteria), assessment of rehabilitation <br />requirements for integration of each alternative to the existing treatment system, evaluation of hydraulic <br />impacts, development of 10% level site layouts and evaluation of phasing of the proposed <br />alternatives. Strengths and limitations of each alternative will be identified and conceptual opinions of <br />probable construction cost developed for each. Work under this task will consider the requirements for <br />the various engineering disciplines that will be involved in the design of facilities (i.e., civil, electrical, <br />instrumentation, mechanical, structural, etc.). <br />Garver will prepare a conceptual design phase estimate opinion of probable construction costs for the <br />chosen alternative with the recommended project components based upon information obtained during <br />the conceptual design phase. For the Conceptual Design, Garver will consider these opinions as <br />estimates and the expected range of accuracy for this type of estimate is -20% to +30% of the estimated <br />construction cost. <br />2.8. Conceptual Workshop <br />Garver will conduct a Conceptual Workshop with the City to present the results of the alternatives <br />evaluation and establish the approach and expectations for design of the project. City comments will <br />be documented and incorporated into the draft Conceptual Design Report. <br />Appendix A - Scope of Services 3 of 5 <br />City of Paris WWTP Improvements <br />