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2017-081
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2017-081
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Last modified
5/24/2017 9:58:44 AM
Creation date
5/24/2017 9:58:38 AM
Metadata
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Template:
Official Documents
Official Document Type
Agreement
Approved Date
05/23/2017
Control Number
2017-081
Agenda Item Number
8.H.
Entity Name
Bowman Consulting Group LTD
Subject
Pavement Reclamation
Resurfacing Project
Area
58th Ave.
Project Number
2016016
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We can then lay out proposed improvements to see what fits and where the conform <br /> issues are. The project will be designed to about the 20-25% complete milestone. <br /> Street modification projects require the designer to spend time in the field, and we <br /> anticipate several field visits during the preliminary engineering portion of the project. The <br /> first will be at the beginning of the project to review and photograph the entire project. The <br /> second time will take place as the preliminary engineering process is being completed to <br /> compare the preliminary layout to the existing conditions. Conflicts will be noted and the <br /> plan modified to accommodate existing conditions. Site visits to correlate our design to <br /> existing conditions is part of our QA/QC procedures. <br /> Once the preliminary engineering work is complete and the project elements and issues <br /> are identified, permitting and utility coordination can move forward. The FDR process will <br /> require that all utility and other interferences be lowered to a depth safely below where the <br /> mixing will take place. This work can advance on a parallel track with the design. Since <br /> both the design and project constraints will have been identified, the design can proceed <br /> with a minimum of interruptions. This approach significantly improves design efficiency, <br /> reduces back tracking, and reduces overall project cost. Proper project development is <br /> part of our QA/QC procedures. <br /> Final Design: <br /> As we move into detailed design, our design philosophy comes into play. Our design <br /> philosophy is that capital cost (the cost to construct the project) typically comes along <br /> once, whereas maintenance costs are forever. We design improvements to be durable <br /> and low maintenance. This means that the design and construction may cost a little more <br /> but the total life cycle cost(the cost the county pays over the life of the project including <br /> maintenance) is lower. The second part of our philosophy is that good design is in the <br /> details. A detailed design typically costs a little more to prepare than a basic design, but <br /> results in savings during construction through fewer change orders to adjust a design to <br /> conform to existing conditions. Design with consideration for how it is constructed and <br /> what is required to maintain the improvements will more than offset the higher cost of a <br /> thorough design. <br /> Preparing the drawings starts with selecting a scale and sheet layout. This is also part of <br /> our QA/QC. If the scale that is selected is too small, there will not be adequate detail in <br /> the design. If it is too large it will increase the sheet count and increase the cost of the <br /> project. For this project we recommend working at 1" = 20' scale because of the level of <br /> detail needed to identify and properly design conforms to existing improvements. The <br /> specifications will need to address work sequencing and phasing as well as controlling the <br /> FDR work. <br /> During the course of the project we will have regular progress meetings with the County. <br /> This allows us to bring attention to the issues we have identified and confirm how they <br /> should be addressed. It also allows mid-way corrections in the design process so we don't <br /> come to the end of the project and be faced with significant changes. Clear <br /> communication and documentation of the design process is part of our QA/QC <br /> procedures. <br /> 37 <br />
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