Form 10810B4the Time Required to Perform WorkItem of WorkA Final estimate quantity for item of workB Number of days Contractor worked on item when it was acurrent controlling operationC Average ra ID: 861241
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1 Form 108 - 10(B)4 Calculation of Tim
Form 108 - 10(B)4 Calculation of Time Extension(s) When Pro Rata is Not Realistic of t he Time Required to Perform Work Item of Work____________________________________________ A) Final estimate quantity for item of work _____________ B) Number of days Contractor worked on item when it was a current controlling operation _____________ C) Average rate of production for item of work (A/B) _____________ D) Number of work days overrun quantity was a controlling operation (Overrun quantity for item of work/C) ___________ __ E) Theoretical calendar days overrun was a controlling operation (D x 30/16) _____________ F) Pro rata time extension allowed due to overrun of item of work (Original contract calendar days)(Overrun quantity for item of work)(Unit price)/(Original contract amount) _____________ G) Additional contract time allowed due to the overrun of item of work (E - F) _____________ (See Instruction for Form 108 - 10(B)4 on the following page) Instructions for Form 108 - 10(B)4 A. Determine the final estimate quantity for the item of work. B. The project diaries will be reviewed and a determination made of the number of day
2 s that the Contractor worked on the ite
s that the Contractor worked on the item when the item involved constituted a current controlling operation. The results of this review will g ive the total number of days during the life of the project that the item involved was a current controlling operation. C. Divide the total number of days Item (B) above into the final estimate quantity Item (A) of the item. This will give an average rate o f work performed on the item per day that the item was a controlling operation. D. Divide the overrun quantity of the item by the average rate of work performed per day Item (C) . The answer will be the n umber of days that the overrun portion was a current co ntrolling operation. E. Convert the number of worked days ( Item D) to calendar days by using the ratio of 16 work days equals 30 calendar days. F. Determine the pro rata time extension allowed for the overrun of the item by multiplying the original number of ca lendar days by the over run quantity by the unit price divided by the original contract amount. G. Determine the additional time extension all o we d for the overrun by subtracting the pro rata time extension (Item F) f rom the theoretical number of calendar days the overrun portion of the item was the controlling operation.