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TASK 2 — Preliminary Design / Feasibility Analysis <br />2.1 The Consultant shall prepare survey, analysis, and provide recommendation with preliminary <br />horizontal layout and cost estimate for preferred design on Site 6. Survey will extend the length of the <br />wall from the curb flowline to 10' behind wall and include all observed drainage facilities within the <br />limits as well as contributing upstream drainage structures where locations are known. Aerial mapping <br />may be utilized if improvements are recommended outside of detailed survey limits. <br />2.2 The Consultant shall field review previous design and easement documents prepared in 2002 for Site 7 <br />and update to include current layout and cost estimates. The City will work with property owner to <br />obtain easement rights. Existing mapping will be supplemented with aerial mapping if necessary. <br />2.3 The Consultant shall subcontract with a geotechnical consultant to perform one (1) Pilot Infiltration <br />Test at the area of concern. Based on findings of infiltration results, the Consultant shall evaluate <br />feasibility of infiltration systems or piping extension and prepare preliminary layout and cost estimate <br />on aerial mapping. <br />Additional Services <br />The City of Tukwila may require other services of the consultant. These services could include additional <br />design, right of way, utility potholing, environmental documentation, construction phase services, or other <br />work tasks not included in the scope of work. At the time these services are required, the Consultant will <br />provide the City with a detailed scope of work and an hour and fee estimate. The Consultant will not <br />proceed with the work until the City has authorized the work and issued a Notice to Proceed. <br />City of Tukwila KPG, Inc. <br />2018 Small Drainage Program Page 5 of 5 March 1018 <br />53 <br />