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Visual description of the real asset; 2-d representation |
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Detailed cost of every activity in work break down structure |
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Used for digital rendering, clash detection, could help to analyze cost and schedule information |
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-Hold quality & time steady but reduce cost -Hold cost & time steady but increase quality -Hold quality and cost steady but decrease time |
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Agreement, general conditions, special conditions, drawings, specifications, agenda, change order |
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Common stipulations about administration & Relationships. Addresses items such as: -Definitions -Owner,A/E,Contractor responsibilities -Time -Payment -Changes in Work -Disputes |
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Aspects of administration/relationships unique to project. Addresses items such as: -Additional instructions -Use of local roads and streets -Clean-up -Mandatory wage rates -Liquidate damages |
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Description of Quality and performance (e.g. equipment) |
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A proposal form establishes intent on part of the contractor to enter into a contract with the owner to complete the work described in the bidding documents at the cost indicated in the proposal.
Information includes: -Price Schedule -Contract duration -Duration between work beginning and receipt of notice award |
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Design alterations and notifications in design change by the owner to all biding contractors |
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-Proposal form -General conditions -Supplementary/Special conditions -Technical specifications -Plans and drawings -Addenda and Change Orders |
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16 Divisions format (1)General -General requirements for the specific material or product (2)Products -Physical descriptions & properties -Designation of source, manufacturer, model (3)Execution - Conditions for installing the specific material or product |
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Guarantee that contractor will follow through with his intended bid |
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Guarantees completion of the work |
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Cover Unpaid Bills by Contractor -50% for <$1M -40% for $1M-2.5M for >$5M
Most institutions now require 100% |
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Workers compensation, Liability insurance |
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Longest to shortest
(1) Physical Life (2) Profit Life (3) Economic Life |
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Hourly Ownership, Maintenance, and Operating Equipment Costs |
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inputs for calculating the hourly rate (fuel, oil, operator, interest, insurance...) |
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IIT for Estimating Equipment Costs |
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Insurance, Interest, and Taxes cost |
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Equipment Overhead and Profit |
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e.g. supervisor time, mechanic time, risk, etc. |
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Purchase Price*(A*H + B*H^2) where H is the hours worked (in thousands). A & B are constants derived for particular machine/condition. |
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Estimate of Residual Value |
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Purchase Price*(K*H^(-exp)) - salvage value |
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Estimate of Average Annual Value |
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where C is purchase price, s is the salvage value and n is the amount of years since year zero
AAV = [C(n+1) + S(n-1)]/2n |
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Loose cubic yards Bank cubic yards Compacted cubic yards |
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[(weight of bank volume/weight of loose volume) - 1]*100 |
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[1 - (weight of bank volume/weight of compacted volume)]*100 |
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Factors affecting quantity per cycle |
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the size of the equipment and the material being moved |
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Factors affecting cycles per hour |
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speed of the equipment, type of soil, grade percentage |
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Qty/Time; usually Qty/hour |
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resistance to movement of a vehicle over the travel surface due to internal friction, tire flexing, and penetration of the vehicle in to the travel service |
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The component of vehicle weight that acts parallel to an inclined travel surface |
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f(Traction, weight on drivers) |
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Subdividing the work into pieces or work packages |
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Quantities and durations for specific related work items |
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Helps produce an overall strategic approach for the job |
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used for initial planning and scheduling |
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Materials, labor, and equipment |
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company overhead and profit. It is often the difference between winning and losing the bid, particularly for "standards" projects |
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Unit Pricing Approach to Estimating |
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Works well for standard items of work, Most common |
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Resource Enumeration Approach to Estimating |
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-Example: Cast-in-place concrete for a dome -Generally required for unique items of work -Typically more accurate |
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-Often requested for alternate materials technology, scope -"To substitute tile for vinyl flooring, add $___" |
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$ amount for certain items |
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$ amount during construction for unseen construction |
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Prices from subs, who and when? |
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Requests for Information (RFIs) |
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Center for the Arts has a ______ LEED certification and recycling __% of building materials. |
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Center for the Arts had a GMP at __% Drawings. Turner Street had a GMP at __% Drawings. |
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Turner will be completed: Center for the Arts will be completed: |
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December 2012 September 2013 |
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