Replacing an Existing Elevated Storage Tank on the Same Site

Transcription

1 Replacing an Existing Elevated Storage Tank on the Same Site 2015 North Carolina Spring Conference NC AWWA-WEA April 13, 2015 Eric Williams, PE

2 Existing Facilities Maintenance Issues Tank Alternatives Challenges

3 Bid Challenges Tank Construction Tank Demolition Construction Costs

4 Project Location

5 Project Location

6 01 Existing Facilities

7 Existing Facilities 2 Inch -12 Inch Water Lines Materials Including PVC, Ductile Iron and Asbestos Cement 3 Master Meters 2 Elevated Storage Tanks

8 West End Elevated Storage Tank Constructed in 1998 Capacity 250,000 Gallons Style Single Pedestal Contractor Brown Steel Contractors

9 East End Elevated Storage Tank Constructed in 1973 Capacity 200,000 Gallons Style Leg Overflow Elevation Approximately 2.2 Feet Lower than West End Tank Contractor Brown Steel Contractors

10 02 Maintenance Issues

11 East End Storage Tank Maintenance Issues Tank in Need of Painting Repainting would Require Complete Shrouding Drip Line of Tank Extended Over 2 Adjacent Properties

12 03 Tank Alternatives

13 East End Storage Tank Alternatives Repaint and Repair Existing Tank o Costs were Estimated at $500,000-$600,000 (Lead Based Paint) o Tank Would Still Be 40+ Years Old Build a New Tank o Can Increase Capacity o Can Match West End Overflow Elevation o Can Match Tank Style o Future Maintenance Less Costly

14 04 Challenges

15 Challenges New Tank Construction Close Proximity of Homes Pile Installation Painting Telecommunications Facilities Demolition of Existing Tank Resort/Vacation Destination Construction Schedule Restrictions

16 Challenges - Tank Site

17 05 Bid Challenges

18 Bid Challenges Planned to Bid Tank Construction and Tank Demolition Separately Only One Bid Received on Bid Day Only One Bid Received on the Rescheduled Bid Day Bid not Submitted by a Tank Contractor A. C. Schultes Bid Received Exceeded Budget Able to Negotiate a Lower Price Negotiations Included Adding Tank Demolition

19 06 Tank Construction

20 Tank Construction Water Line Installation 12-Inch Water Line Design was to Cut In New Tee Existing Isolation Valve Would not Hold

21 Tank Construction Foundation Installation Driven 12-Inch Steel H Piles Minimum Depth Required - 40 Feet Monitored Vibration at Adjacent Homes Noise Restrictions (8:00 am 8:00 pm) Pile Cap 4 Feet Thick by 2.5 Feet Wide 24 2 Anchor Bolts by 3 Feet 4 Inches Long (To Extend 7 Inches Above Concrete)

22 Tank Construction Structure by Caldwell Tanks Challenges o Close Proximity of Homes o Total Site Less than ½ Acre o Storage Space for Steel Components o Existing Tank o Telecommunications Structures

23 Tank Construction Structure Single Pedestal Complaints/Damage to Private Property

24 Tank Construction Painting Shrouding Required Tightly Woven Nylon Windy Conditions 15 mph Maximum Summer Season Restrictions

25 Tank Construction Shrouding Outriggers Extensive Cabling Equipment at Base of Tank for Raising and Lowering Shroud

26 Tank Construction Paint by Tnemec Interior (Dry) 2 Coat System o Shop Prime 5.0 mils Series N-140 Epoxy o Stripe Coat 5.0 mils Series N-140 Epoxy For all Seams and Abraded Areas o Finish Coat 5.0 mils Series N-140 Epoxy Stripe Coat then Full Coat Interior (Wet) 3 Coat System o Shop Prime 3.0 mils Series 94 Hydro-Zinc o Stripe Coat 3.0 mils Series 94 Hydro-Zinc For all Seams and Abraded Areas o Finish Coat 5.0 mils Series N-140 Epoxy Stripe Coat to all Weld Seams, Edges, Corners, Bolts and Nuts Tank White 5.0 mils Series N140 Epoxy Beige Color 5.0 mils Series N140 Epoxy Tank White

27 Tank Construction Paint by Tnemec Exterior 4 Coat System o Shop Prime 3.0 mils Series 94 Zinc Rich Polyurethane o Stripe Coat 3.0 mils Series 94 For all Seams and Abraded Areas o Finish Coat 3 Separate Coats 3.0 mils Series N69 Hi-Build Epoxy 2.0 mils Series 73 Endura Shield (Polyurethane Enamel) 2.5 mils Series 700 Hydroflon

28 Tank Construction Tank Components Standby Generator for SCADA Electrical and SCADA Equipment Discharge Headwall Structure Altitude Valve

29 Tank Construction Telecommunication Vendors ATMC/AT&T Verizon Town Communication Antenna SCADA Antenna Verizon ATMC/AT&T

30 Tank Construction Telecommunications Cabling in Tank Cabling Continues Through Access Tube

31 07 Tank Demolition

32 Tank Demolition Protect Telecommunications Structures Protect Brand New Tank Loading of Steel Components

33 Tank Demolition No Complaints or Damage During Demolition Three Days from Start to Finish

34 Tank Demolition Valve Vault Other Structures

35 08 Construction Costs

36 Construction Costs Original Budget - $1,400,000 As Bid Without Demolition - $1,574,618 After Negotiations with Demolition - $1,498,600 Final Cost after Change Orders - $1,475, Approximately $35,000 Paid by Telecommunications Vendors

37 QUESTIONS Eric Williams, PE 910/