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will meet with City representatives at mutually convenient times to assemble this data and <br />information. <br /> <br />1.2 TASK 1 - ODOR CONTROL EVALUATION <br /> <br />The Engineer will: <br /> <br />1.2.1 Perform an assessment of existing data, for both the WWTP and upstream wastewater <br />collection system siphon structure and evaluate the liquid oxygen system impacts on odor and <br />WWTP operations. The Engineer will prepare an identification of reduction and control strategies <br />for both the liquids and solids treatment systems, including cost estimates. <br /> <br />1.2.2 Address the following key issues: <br /> <br /> i. Effectiveness of the new Liquid Oxygen (LOX) system and dispersion modeling. <br /> ii. Modification of previous odor control improvements. <br /> iii. The odor impact across the WWTP. <br /> iv. Impact of fnture process improvements on odor control. <br /> e. Achievement of odor control by process modification. <br /> <br />1.2.3 Perform field testing of headwork area to acquire new inputs for odor model. <br />1.2.4 Conduct air dispersion modeling of revised conditions based on operation of LOX system. <br />1.2.5 Assess primm~ clarifier odor control needs. <br />1.2.6 Conduct four site visits. <br />1.2.7 Monitor liquid oxygen injection system to document performance and facilitate optimization. <br />1.2.8 Revise offsite impacts assessment using new odor emissions data. <br />1.2.9 Identify additional odor emissions reductions necessary to mitigate offsite impacts. <br />1.2.10 Assist in odor control design for siphon structure. <br /> <br />1.2.11 Perform a preliminary assessment identifying potential areas for improvement for City review <br />and approval. <br /> <br />1.2.12 Perform a final assessment. <br /> <br />1.2.13 As requested by the City, identify selected recommended alternatives for"fast-track" design <br />and construction. <br /> <br />CH2M Hill. 2.wpd 2 <br /> <br /> <br />