Question

5. (1 point) If using RSMeans data to calculate the costs for horizontal directional drilling and installing a 24" steel pipe under a road for 100 feet on the GMU Fairfax campus, which of the following is not true for the appropriate line item? a. Production will be 20 linear feet per hour after setup. b. The steel pipe casing will have welded connections. C. The cost of a 100 ton hydraulic crane will be included in the cost. d. The cost of dewatering a jacking pit is not included in the cost. 6. (1 point) When placing potable water distribution and sewer lines in the same trench, good construction practice is to: a. Place the potable water distribution line at least 12 vertical inches above the sewer line. b. Place the potable water distribution line at least 12 vertical inches below the sewer line. C. Place the potable water line and sewer line at the same depth, though separated by 12 inches horizontally d. Place them as close together as possible to minimize the amount of excavation, as long as they are below the frost line. 7 11 point contract contains the following couco. The contractor is to provido 50% attic stock on all materiale

Answer 1

Hi,

Solution as follows:

Question 5: False Statement?

RSmeans data provides approximate estimates of various activities based on the historical data. It has a base rate for all items and rates for addition/ reduction from base as per original specifications of work.

For horizontal drilling, cost of excavation jacking pit, dewatering, backfilling, drilling pipe and welding is included in the rates including all the labor, materials, equipments etc.

In the given question it is written in option d “The cost of dewatering a jacking pit is not included in the cost” which is a false statement.

Rest all options are true; hence the answer is option d.

Question 5: Clearance between sewer and water line?

When putting sewer and water line in the same trench, due care need to be taken to keep the potable water safe from being polluted. If sewage water get entered in to the potable water line by any means, whole line would be polluted which need to be cleaned and disinfected again.

To keep the potable water line safe from sewage water, I minimum clearance of 1 foot is always kept between both lines.

As per good engineering practice, the potable water line kept 1 foot above the sewer line to avoid any entry of sewage water with potable water.

Hence correct answer is option a.