07-Str-B2 · December 2017
Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)
Paper format: National Exams, December 2017 — 07-Str-B2 Management of Construction. Three hours, closed book, one approved Casio or Sharp calculator permitted. Six questions of equal value (20 marks each); any five constitute a complete paper and only the first five answered in the answer book are marked. All six are worked below so that the paper can be used for revision whichever five a candidate chooses.
Reference texts: Hegazy, T., Computer-Based Construction Project Management (Prentice Hall) — precedence (activity-on-node) networks with lags, forward and backward passes, total and free float, earned-value progress measurement and the time–cost trade-off curve; these chapters carry Questions 1 and 3. Hendrickson, C. & Au, T., Project Management for Construction (2nd ed., Carnegie Mellon) — Chapter 5 (cost estimation and unit-cost data), Chapter 10 (fundamental scheduling procedures), Chapter 11 (advanced scheduling with lags) and Chapter 12 (cost control, monitoring and accounting), including percent-complete and earned-value reporting. Halpin, D.W. & Senior, B.A., Construction Management (4th ed., Wiley) — labour productivity, crew balance, construction contracts and bonding, and construction safety management. Peurifoy, R.L. & Schexnayder, C.J., Construction Planning, Equipment and Methods (9th ed., McGraw-Hill) — crew productivity and the physical determinants of daily output, behind Question 3. R.S. Means, Building Construction Cost Data (annual) — the structure of a unit-price line: crew, daily output, labour-hours per unit, bare material / labour / equipment, and total including overhead and profit. Sullivan, W.G., Wicks, E.M. & Koelling, C.P., Engineering Economy (17th ed., Pearson) — Chapters 5 and 6, present-worth analysis and the repeatability (common multiple of lives) assumption for alternatives with unequal lives, used in Question 4. AACE International, Recommended Practice 29R-03, Forensic Schedule Analysis, and the Society of Construction Law Delay and Disruption Protocol (2nd ed., 2017) — the delay-analysis taxonomy required by Question 2. Canadian Construction Documents Committee, CCDC 2 — Stipulated Price Contract (2020), CCDC 220 Bid Bond, CCDC 221 Performance Bond, CCDC 222 Labour and Material Payment Bond and CCDC 40 — Rules for Mediation and Arbitration, together with the BC Builders Lien Act holdback provisions — the Canadian contractual machinery behind Questions 2 and 5. Transportation Association of Canada, Manual of Uniform Traffic Control Devices for Canada (MUTCDC) and the BC Ministry of Transportation and Infrastructure Traffic Management Manual for Work on Roadways, with WorkSafeBC's Occupational Health and Safety Regulation (Part 18 Traffic Control, Part 4 lighting and workplace conditions, Part 8 personal protective clothing) — the Canadian rule set behind Question 6.
Check — what the printed R.S. Means line in Question 3 actually contains. On line 04810‑3000 the printed cells are labour-hours 0.092, bare material $3.62, bare labour $2.93, bare total $6.55 and total including O&P $8.45. The CREW, DAILY OUTPUT, UNIT and EQUIPMENT cells are blank on the paper — they are not faint, they carry no ink at all. The self-consistency of the printed row ($3.62 + $2.93 = $6.55) confirms the money columns were read correctly.
Question text not reproduced: the examination questions are © Engineers and Geoscientists BC. Open the official past paper (linked at the top of this page) to read the question, then follow the worked solution below.
All three instruments protect the owner, but they do so at different moments in the life of a contract, they are provided by different parties, and they answer different failures. A bond is a three-party undertaking — the surety guarantees the contractor's obligation to the owner — whereas retention is a two-party arrangement in which the owner simply keeps back part of the contractor's own money. That structural difference explains almost everything else about them.
The bid bond. Issued with the tender and usually written for ten per cent of the bid price (CCDC 220 is the standard Canadian form), it guarantees that if the bidder is awarded the contract it will enter into the contract at the price bid and provide whatever performance and payment bonds the tender documents require. It answers exactly one failure: bid withdrawal or refusal to sign. If the low bidder walks away, the surety pays the owner the difference between that bid and the next acceptable one, up to the bond amount. It expires the moment the contract is executed and the permanent bonds are in place. Its second, less obvious function is pre-qualification: a surety will not bond a contractor whose financial capacity, work record and management the surety has not underwritten, so the presence of a bid bond is itself evidence that the bidder can carry the job.
The performance bond. Issued at award and typically written for fifty per cent of the contract price in Canadian public work (CCDC 221), it guarantees completion of the work according to the contract if the contractor defaults. On a declared default the surety may choose among financing the original contractor, tendering the remaining work to a completing contractor, taking over the work itself, or paying the owner its loss up to the bond amount. It runs for the whole construction period and usually into the warranty period. It answers a completely different failure from the bid bond — performance of the work, not execution of the contract — and it is not insurance in the ordinary sense: the surety that pays a claim has a right of indemnity against the contractor and its principals, so the contractor ultimately bears the loss. The companion labour and material payment bond (CCDC 222), also normally fifty per cent, protects subcontractors and suppliers by giving them a direct claim against the surety, which in turn protects the owner against liens and against the disruption of unpaid trades leaving the site.
Payment retention (holdback). This is neither a bond nor insurance. The owner withholds a percentage of each progress payment — ten per cent in most Canadian jurisdictions under the provincial builders-lien or construction-lien legislation, held for a statutory period after substantial performance — and releases it when the lien period expires and the deficiencies are made good. Some contracts add a further contractual holdback on top of the statutory one, or reduce it at fifty per cent completion. Retention is immediate and self-executing: it needs no default declaration, no surety and no claim process, and it costs the owner nothing. Its purpose is the opposite end of the risk spectrum from a bond — it covers ordinary deficiencies, punch-list work, minor liens and small over-payments, not catastrophic failure. Its limitations are that the sum available is small early in the job when the exposure is largest, and that it directly reduces the contractor's working capital, which raises bid prices and pushes financial strain down the supply chain onto subtrades. That is precisely why prompt-payment legislation across Canada has moved to constrain it.
Summary of the differences. The bid bond is pre-award, ten per cent, guarantees contract execution, and is provided by a surety. The performance bond is post-award, typically fifty per cent, guarantees completion of the work, and is likewise provided by a surety who has recourse against the contractor. Retention is post-progress-payment, typically ten per cent of amounts certified, is provided out of the contractor's own earnings, and covers deficiencies and lien exposure. Bonds cover the failure of the contractor as an enterprise; retention covers the failure of the work in detail. A prudent owner uses all three, because none of them substitutes for another.
Advantages of using union resources on projects. Engaging a unionised workforce under a collective agreement brings several practical benefits. A trained and certified labour pool: the building trades run joint apprenticeship and training funds, so journeypersons arrive with certified skills, current safety tickets and documented hours, which reduces the contractor's own training cost and raises the average quality of workmanship. Predictable labour supply: the union hall can dispatch qualified workers on short notice and in numbers, which is decisive when a schedule must be accelerated or a second shift added, and it removes the recruiting burden from the contractor's staff. Wage and benefit certainty: the collective agreement fixes rates, premiums, travel and benefit contributions for its term, so the estimator can price labour with confidence and is not exposed to local wage escalation. Industrial-relations stability: an agreement in force normally contains a no-strike, no-lockout clause and a grievance procedure, so disputes are handled without stopping the job. Safety performance and administrative simplicity: joint health-and-safety committees, standardised training and portable benefit and pension administration reduce incident rates and remove per-worker administration from the contractor. Access to work: much Canadian public and heavy-industrial work is tendered under project labour agreements or union-affiliated conditions, so union affiliation is a precondition of bidding at all. The offsetting considerations, which a complete answer should name, are higher direct wage costs, jurisdictional demarcation between trades that can constrain crew flexibility, and manning and work-rule provisions that limit how the contractor deploys labour — the reason many contractors run both union and open-shop entities and select the route project by project.
