CH2M Hill Engineers Inc 10/24/2016

• Design drawings shall be prepared in Micro Station format resulting in half size= 11"x17" and full size=22"x34"drawings. Service Provider shall convert Micro Station electronic files into AutoCAD format,and provide AutoCAD electronic files to City upon completion of design. • City will provide to Service Provider all data in City's possession relating to Service Provider's services on the project. Service Provider will reasonably rely upon the accuracy,timeliness,and completeness of the information provided by City. • City will manage and undertake bidding of the construction contract and manage and undertake on- site resident observation of construction. City will also review shop drawings and address questions and inquiries from the contractor. • It is assumed that the project site is entirely on property owned by the City of Everett. No property boundary surveying is included as part of this work. • Given that no soil borings or other geotechnical investigations were conducted at the project site, it is assumed that subsurface conditions are suitable for founding the new concrete portion of Portal 1 with a new floor-slab that may be as much as 1 foot thicker than the existing floor slab. • Large construction equipment will be required at the Portal 1 project site, including:a crane, backhoe, dump truck, concrete mixer truck, pipe delivery truck, and other service vehicles. It is assumed that these vehicles can access the project site from the adjacent access road either from one direction or the other. As part of the design,Service Provider shall specify that equipment and vehicle selection and access improvements shall be made as deemed necessary by the contractor to complete the work. • Soil and groundwater at the drilling sites are assumed to be free of contamination;thus, no special care, health and safety plan, and handling is needed during field operations and laboratory work. • City will provide the maximum water surface elevation of the conveyed water from Lake Chaplain upon which the modified portal structure shall be designed. Task 1. Surveying Service Provider shall subcontract with a qualified surveying firm to complete the field survey and establish horizontal and vertical control points within the project area but outside the area of construction. Survey datum shall be NAD 83/2011 and NAVD 88,to be established by static GPS methods with National Geodetic Survey (NGS)On-Line Positioning User Service(OPUS). The limits of the project area for which surveying shall be completed shall be up to 40,000 square feet surrounding the existing portal structure. The actual limits of the survey shall be defined as part of a preliminary site visit to be attended by Service Provider's project manager,the survey subcontractor, and City. The survey is anticipated to require up to three 8-hour work days in the field for a two-person crew to complete the initial survey. A single,additional day of surveying is reserved for incorporating the geotechnical boreholes and potentially picking up other surface features not incorporated during the initial visit. Service Provider shall prepare a 1"=20'topographic base map and Digital Terrain Model (DTM) of the project limits.The base map will include, but not be limited to,the existing portal structure,the access road, existing cleared area, other key surface features, signs,trees (greater than 12-inches in diameter), ditches, culverts, buried pipes (as painted out by City), catch basins, bridges, utility poles,and other surface features within the mapping limits. One-foot contours will be generated from the DTM. Deliverables: 2