Cost_Estimate_-_100%_Design_December_2025.pdf
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- Solicitation number
- 107594
- Issued by
- Prince George's County, Maryland
About this file
This is a 100% Design Cost Estimate prepared in December 2025 for the Washington Suburban Sanitary Commission's (WSSC) Western Branch Water Resource Recovery Facility Potable Water System Upgrade project in Prince George's County, Maryland. The project encompasses the construction of a new well house, potable water system infrastructure, and associated site work. Major components include two production wells (one 6-inch diameter and one 12-inch diameter, each 350 feet deep), a 24-foot by 28-foot CMU well house, water treatment systems including a water softener and chemical feed system, two well pumps with capacities of 1,100 gallons per minute and 85 gallons per minute, approximately 3,980 linear feet of 8-inch C900 PVC DR-14 pipe with ductile iron fittings, fire hydrant and valve vault installations, electrical duct bank work, and comprehensive site restoration including erosion and sediment control, pavement milling and overlay, and asphalt restoration. The sealed response deadline for the rebid is 2:00 pm on Monday, July 27, 2026, submitted via WSSC's eProcurement Portal.
The total construction cost estimate is $5,444,150.00, comprising a base construction cost of $5,184,905.00 and mobilization costs of 5% ($259,245.00). This estimate includes significant contingencies with an allowance of $350,000 for unanticipated additional work and $75,000 for contingent 100-pound weight fittings. The project scope encompasses water main installation, well and well house construction, electrical work, site work, and pavement restoration activities. The estimate was prepared at the 100% design phase, indicating the project design is substantially complete and ready for contractor bidding and construction.
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Text version
Item Description Unit Quantity Unit Price Total Price
A-1 Clearing & Grubbbing LS 1 $125,000 $125,000
A-2 Erosion & Sediment Control LS 1 $150,000 $150,000
A-3 Corrosion Control LS 1 $80,000 $80,000
A-4 8-inch C900 PVC DR-14 Pipe with Ductile Iron Fittings LF 3,980 $400 $1,592,000
A-5 6-inch DIP Class 54 LF 200 $350 $70,000
A-6 4-inch DIP Class 54 and Fittings LF 285 $325 $92,625
A-7 3-inch DIP Class 54 and Fittings LF 25 $310 $7,750
A-8 8-inch Vertical Valve & Vault EA 5 $5,600 $28,000
A-9 6-inch (Fire Hydrant) Vertical Valve & Vault EA 8 $8,500 $68,000
A-10 4-inch Vertical Valve & Vault EA 3 $4,500 $13,500
A-11 2-inch Temporary Bypass Piping LF 550 $20 $11,000
A-12 1-inch Flexible Copper and Fittings LF 236 $180 $42,480
A-13 Corporation Stop EA 3 $2,000 $6,000
A-14 Fire Hydrant EA 8 $7,800 $62,400
A-15 24'x28' CMU Wall Well House LS 1 $580,000 $580,000
A-16 Well Water Softener System LS 1 $60,000 $60,000
A-17 Well House Interior Piping & Fittings LS 1 $85,000 $85,000
A-18 NaOCl Solution Tank LS 1 $25,000 $25,000
A-19 Secondary Containment Pallet EA 1 $5,000 $5,000
A-20 Chemical Feed Pump EA 2 $15,000 $30,000
A-21 Portable Eye Wash EA 1 $3,500 $3,500
A-22 Bladder Style Hydropneumatic Tank EA 2 $30,000 $60,000
A-23 Well (6" dia 350' deep) LS 1 $300,000 $300,000
A-24 Well (12" dia 350' deep) LS 1 $500,000 $500,000
A-25 Well Pump (1,100 gpm) EA 1 $160,000 $160,000
A-26 Well Pump (85 gpm) EA 1 $30,000 $30,000
A-27 Well House HVAC LS 1 $45,000 $45,000
A-28 Well House Door and Skylight LS 1 $15,000 $15,000
A-29 Well House Lighting LS 1 $25,000 $25,000
A-30 Asphalt Access Driveway CY 30 $750 $22,500
A-31 Concrete Sidewalk CY 2 $1,200 $2,400
A-32 Asphalt Pavement Restoration SY 1,590 $45 $71,550
A-33 Mill and Overlay SY 2,490 $40 $99,600
A-34 Misc. Electrical Work LS 1 $225,000 $225,000
B-1 Borrow Excavation Of Suitable Soils, Installed CY 75 $50 $3,750
B-2 Undercut And Dispose Of Unsuitable Soils CY 75 $65 $4,875
B-3 Fill/Select Material Installed CY 75 $65 $4,875
B-4 Rock Excavation CY 10 $100 $1,000
B-5 Gravel And Sand For Various Purposes TON 40 $40 $1,600
B-6 Field Adjustments of Erosion and Sediment Control Practices LF 500 $10 $5,000
B-7 Test Pit EA
B-8 Concrete Sidewalk LF 20 $325 $6,500
B-9 Concrete Curb and Gutter LF 40 $100 $4,000
B-10 Asphalt Concrete Pavement SY 100 $250 $25,000
B-11 Mill And Overlay SY 250 $40 $10,000
B-12 Contingent 100 Pound Weight Fittings CWT 100 $750 $75,000
B-13 Allowance For Unanticipated Additional Work AL 1 350,000 $350,000
5,184,905.00$
259,245.00$
5,444,150.00$ Total
Wells and Well House
Subtotal
Mobilization (5%)
Pavement Restoration
Electrical
Contingent Items
Not Applicable - Not Used
Site Work
Water Main
100% DESIGN CONSTRUCTION COST ESTIMATE
Prince George's County, Maryland
Contract No. CD6915B20
Prepared : December 2025
Western Branch WRRF Potable Water System Upgrade
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