Remember Joan? The owner representative for the Library project. The project has moved

through design, the contract type selected, and the project was put out to bid. A variety of

subcontracts were developed by the General Contractor for the project. One was for site work.

One particular work package in the site work subcontract involved foundation excavation and

piping installation. This work package integrated with the foundation work package $($footings

are part of the concrete subcontract$)$

Joan was really getting into the construction activities associated with the project. As such, she

wanted to verify some of the subcontract estimates. Sbe chose the foundation excavation work

package.

Joan called Chuck with several questions to get her started on estimating the cost of the trenching

work package. Later that day, Chock dropped off several tables with the rest of the information

required to complete the bid estimate, along with a short note:

$"$We decided to wse a trwck with a trailer for hamling earth. Inctude this in the overhead"

cost and don't warny about balancing it with the loader. Include the truck and trailer

costs for all the hours warked by the foreman because they also thiclude the cost for the

thwe not used. The foreman should be on the job for about $172$ hows. Also, the concrete

footing, floor slab, and the inswlation will be done by other contractors, so don't worry

abowt them. Eyjoy:"

Table $1$ Expected prodnctivity and equipment cost

"Note: Job Efficiency Factor is already included in these productivities

Material Properties

Excavation: Swell Factor $=25\%($when excavated, the soil expands by $25\%$ into Loose Cubic

Yards$)$

Compaction: Bedding Material Shrinkage $-6\mathrm{.}8\%($utien compacted, bedAing shrinks $6\mathrm{.}8\%)$

Backfill Shrinkage $=10\mathrm{.}8\%($when compacting backfill, it shrinks $10\mathrm{.}8\%)$

Table $2$ Required Labor

Table $3$ Cost Summary

Estimating Assignment

You are Joun, so: prepare a memo to Chock for the foundation excavation work package estimate

setting out your calculations, results, and suggestions for the estimate of the excavation. Your

solution should include the following information:

The total quantities of excavated material, beding material, and backfill measured in LCY$.$

LCY $=$ loose cubic yards. The volume of material 'after' excavation.

The unit price $($S$/$LCY$)$ and total price of each item.

The total price of the excaration. Don't forget to add profit to your estimate.

Go to the OSHA web site and find safety recommendations for trench excavation. As you

finshed the estimate, you checked the OSHA regulations for trenching and you found some

very important information that you want to share.

Atrach all of your calculations as a supplement to the memo.

Feundation Excavabion Work Items to be priced