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POU(STRFET OUfFAU. WATER QUALITY IMPROVENIENTS, PROJECT t3A94 <br /> with copies of information determined by the project team to be relevant to the current <br /> project. <br /> (~i2M HILL will continue our review of the existing background information to gain an <br /> understanding of site conditions, previous work, and potential constraints and <br /> opportunities for consideration in an alternatives analysis. As a follow-up to the December <br /> 20, 2004 project scoping meeting, discussions may be held with various City staff that hold <br /> knowledge regarding site conditions, previous work, and potential constraints and <br /> opportunities for consideration in an alternatives analysis. Discussions with City staff will <br /> be arranged through the City project manager. <br /> Deliverables <br /> CH2M HILL will compile any additional requests for information and submit to the City <br /> Project Manager. A sluxu~nary of the review wiU be prepared and included in the long-term <br /> basin strategies plan (described in Task 4) as appropriate. <br /> Task 2. Near~erm Project Altematlves Evalua#bn <br /> Task 2.1- In collaboration with City staff CH2M HILL will conduct an evaluation of <br /> alternatives for design and construction of a near-term project or series of projects to <br /> improve stormwater discharge quality at the Polls Street outfall. The evaluation will <br /> consider stormwater treatment options that can be implemented via retrofit of the existing <br /> stormwater drainage system and other potential solutions. An end-off <br /> pipe capture and <br /> treatment option that can be incorporated into existing facilities and/or City properly will <br /> be evaluated. Source control, illicit discharge elimination, and other best management <br /> practices evaluations are on <br /> going by the City, and will be considered as additional <br /> measures to achieve water quality improvement objectives. Criteria for the evaluation of a <br /> near-term capital project(s) will include performance, implementation cost [relative order of <br /> magnitude capital and operations 8,c maintenance costs (high, medium, low)], <br /> constructability, operation and maintenance, and other criteria to be agreed upan by <br /> CH2M HILL and the City project team. <br /> Deliverables <br /> CH2M HILL will prepare and submit a draft alternatives analysis Technical Memorandum <br /> (TINT) to the City. Pollowing City review of the TM, CH2M HILL will conduct a review <br /> meeting with the City to select a preferred alternative and determine design elements. The <br /> draft TM will be finalized to incorporate City comments. <br /> The TM will serve to document the methodologies used in conducting the alternatives <br /> evaluation, and rationale for selection of the preferred alternative. <br /> Assumptions <br /> • An initial screening of alternatives will be conducted. The initial screening will include <br /> development of a matrix of pofienfial best management practices (BMPs) at up to six <br /> <br /> PDXIPOLK ST 8A5;N PLANNWG AND ~1t3NJEERINC FlNAL SO4U.OOC 2 <br /> <br />