Agenda - 10-01-1996 - 7b - Laserfiche WebLink

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3 i MEMORANDUM TO: Tara Fikes, Housing and Community Development Director FROM: Paul Thames, PE, County Engineer DATE: September 17, 1996 SUBJECT: Construction cost estimates for completion of the unfinished portion of Phase I and Phase II of the Efland sewer system As per your request, I have reviewed my previous construction cost estimates for the sewer system construction referenced above with the intent of updating those estimates in light of current construction cost experiences in this area. My pervious cost estimate for development, as per the system design presented in the Hazen and Sawyer master sewer plan, of the remaining portion of Phase I and and Phase II totaled$1,076,000. The estimate dates from October 1991 and included construction costs plus a figure equal to twenty-five percent the construction cost for contingencies, engineering, surveying, legal, and administrative. Although construction cost remained fairly constant for approximately half of the five years that have elapsed since the October 1991 cost estimate,I believe that current costs -at least in this area- have escalated twenty to twenty-five percent above 1991 costs. My current estimate is that the Phase I/II sewer development outlined in the Hazen and Sawyer master plan will fall in the $1.25 to $1.35 million range. The breakdown of costs associated with the sewer system development plan contained in the Hazen and Sawyer master plan is as follows: Phase I (remainder) Relocate existing main pump station(w/ standby power) lump sum @ $ 45,000 ea. = $ 45,000 New pump station (w/o standby power) lump sum @ $40,000 ea. = 40,000 12"pvc gravity line (w/stone bedding) 1900 linear feet @ $28.00 per if = 53,200 8"pvc gravity line (w/stone bedding) 12800 linear feet @ $ 20.00 per if = 256,000 10"ductile iron force main(w/o stone bedding) 1900 linear feet @ $ 23.00 per if = 43,700 4"pvc force main (w/stone bedding) 2200 linear feet @ $ 10.00 per if = 22,000 Precast concrete manhole w/cast iron ring/cover 56 each @ $ 1500 each = 84,000 16"highway bore encasement(for 8"pipe) 300 linear feet @ $ 120.00 per if = 36,000 8"highway bore encasement(for 4"pipe) 100 linear feet @ $ 80.00 per if = 8000 Rock excavation/backfill 1500 cubic yards @ $ 55.00 per cy = 82,500 Erosion control lump sum @ $ 10,000 = 10,000 Traffic control lump sum @ $ 5000 = 5000 Roadway/driveway repair lump sum @ $ 50,000 = 50,000 4" sewer services 110 each @ $ 600 each = 66,000 Mobilization lump sum @ 5.0% = 39,600 Engineering, s ,rvene contingencies legal administrative na 25% = 210,000