KIER & WRIGHT (#2027114) - Laserfiche WebLink

Schaaf & Wheeler will provide regiona l hydraulic and floodplain input for each alignment alternative, evaluati ng how each opt ion interacts wi t h drainage patterns and floodplain boundaries in t h e corridor and p rovi d ing t h e hyd raulic constraints that inform span sizi ng and d rainage routing for the Arroyo Mocho crossing. PAS E will develop bridge crossing concept s for the Arroyo Mocho. working in coordinat ion with Schaaf & Wheeler's hydraulic fi ndings to establish span requirement s and vertical clearance needs. and will evaluate structural options to recommend t he most appropriate and economical structure type. They will also provide st ructural input on ra ilroad crossing geometry and any site-specific retaini ng wall n eeds ide nt ified during alternatives development. Alta Engineering wi ll provide rail expertise and identify high-level plannin g const raints and design triggers for ra il crossings. T he ir efforts w ill include operat ional requirement s for mainta ining active rail t raffic d uri ng construction, applicable shutdown w indows and flagging restri ctions, and st ructural and clearance requirement s for crossings. Rai lroad coordinat ion at t his st age is limited to informal informat ion gathering and does not constitute a formal applicat ion to UPRR. T he informat ion obt ained wi ll reflect what railroad personnel are willing t o share at t his point in project development. Fo rmal determinations on clearances, operat ional requirements. and construction condit ions cannot be made unt il a complete applicat ion is submitted and approved. with const ruction required to commence wit hin the t imeframe sti pulated in that approval. Cornerstone Earth Group will provide qualitative geotechnical ri sk ratings for each alignment alternative and flag areas where subsurface conditi ons could represent a significant cost. schedule. or feasibilit y constraint. Rad ius Design will ident ify existing dry utility conflicts along each alignment alternat ive and identify the backbone dry utility inf rastructure that shou ld be accommodated within the corridor right-o f-way to serve fut ure development in t he area . est ablishing t hat placeholder now w ithin the r ig ht -of-way envelope being defined by this study to prevent costly retrofitting in later project phases. Green Design will contribute conceptual landscape and planting t reatment s to the typical sections and possibly typical p lan layouts, illust rating corridor character in section for m alongside t h e engineering cross sections. This gives the City and d ecision-makers a visual sense of what t h e fin ished corri dors would look li ke. Deliverables: Alternat ives exhibit s and technical evaluation m e morandum wit h conceptual roadway plan and profile drawings. typical sections. and intersection concepts for each alternative, right-of-way enve lopes, corridor planting concepts in section form /plan , and planning -level cost estimates for each alternative. TASK 6 -TECHN ICAL EVALUATION OF ALTERNATIVES LEAD FIRM: K+W CONTRIBUTING: ALL SUBCONSULTANTS Utilizing the framework developed in Task 4, K+W wi ll evaluate each o f t h e alternatives. T he analysis wi ll include qualitative and quant it ative measures, assessing t raffic operations, safety, geomet ri c feasibi lity, utility and drainage implications, right-of-way impacts, envi ronmental constraints, order-of-magnitude cost s, and construct ability. K+W will synt h esize all subconsultant input into a consolidated alternatives evaluation memoran dum. To supplement the design team's cost and constructabili t y assessm e nts. K+W will leverage its longstand ing relationships with prominent heavy civil cont ractors active in this region to solicit informal input on construction feasibilit y, sequencing challenges, and pot ential (rough o rder-of-magnitude) costs for key elem ents such as the rai lroad undercrossing, the Arroyo Mocho bridge crossing, and earthwork in the quarry t ransit ion zones. This cont ractor perspective brings p ractical field knowledge t hat design professionals alo ne cannot fully replicate and w ill h elp ensure t hat t h e alternatives eva luat ion reflects real-world costs and what is required to construct the improvement s. Th e resulting m emorandum w ill d irectly support the city's ability to make an informed. technica lly defensible alignment selection. Deliverables: Technica l evaluation memorandum identifyin g major risks. t radeoffs. and potential fa tal flaws for each alternative. Kier + Wright I Page 15 Docusign Envelope ID: 776668AA-84FE-8E4D-81ED-F89B854166B8Docusign Envelope ID: 1E4E4FCF-7AB2-8687-82B4-D0B680FDBFDB