The contractor installing the sewer pipe in Figures 16.3 and 16.4 chose a moveable trench shoring system over a 1:1 slope cut excavation.

Figure 16.3

Figure 16.4

Calculate the contractor’s overall savings for this approach utilizing the excavation conversion process and pricing discussed with structural excavation in Chapters 6 and 10. Assume the native soils are sufficient for backfill.

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Tri-County Conveyance Pipeline - Estimate Bid Item: 4- Install 18" PVC Sanitary Sewer Quantity Description 123212 3 2 2 1 1 2 I 1 1 1 CREW AND EQUIPMENT Foreman Flaggers Operators Laborers Pipelayer Truck Drivers Excavator Wheeled Loader Hourly Labor Cost Equip Cost per Shift per Shift Rate 55 34 50 35 42 49 440 544 1,200 560 336 784 Dump Trucks 70 KW Gen w/Pumps Compactor Tool Truck Pickup High Country Construction Subtotal Labor Cost/Shift Add Labor Burden @ 55% of Labor_ Total Labor Cost/Shift 800 500 400 200 150 120 90 Shift Total Total Equipment/Shift Total Labor and Equipment/Shift Number of Shifts Activity Labor and Equipment 440 544 1,200 560 336 784 3,864 2,125 $5,989 800 500 400 200 150 120 90 2,260 8,249 9 $74,241 Scope: Install 1,600 LF of 18" PVC Sanitary Sewer CONSTRUCTION AND PERMANENT MATERIALS Material 18" PVC Pipe Pipe Bedding Backfill (native) Shoring Quantity Unit LF 1,600 625 TN 0 TCY 2 WKS Subcontractor Quantity Closed-Circuit Television Test 1,600 SUBCONTRACTORS Unit Activity Install 18" Sanitary Sewer Pipe 1,600 LF @ 200 LF/Shift Existing Utilities 400 Total Materials Labor and Equipment Cost Materials Cost Unit Price 28 8 ACTIVITY DURATION Subcontractor Cost Total Activity Direct Cost LF 3 Total Subcontractor Total Unit Price Total Price 74,241 50,600 4,800 $129,641 Shifts TOTAL ACTIVITY DIRECT COST 8 9 Total Price 44,800 5,000 0 800 $50,600 4,800 $4,800