As a General Contractor, Design-Builder and Environmental Manager our list of services include:

 New Construction & Additions

 Historic Restorations


 Maintenance & Repair

 Environmental Project Management

 Brownsfield Abatement

 Fuel System Replacement

 Health & Safety Plans


 Specialty Construction


 Dome Gilding

 Burn Buildings

 Ice Rinks


works2Many cities are looking at the option of natural gas vehicles. With new federal funding available and an obvious cost savings over a diesel or gasoline powered fleet, it is a viable choice. However the garages where these busses or other vehicles are serviced, do need to be modified. Below are some details of a CNG PUBLIC WORKS GARAGE UPGRADE we did for the City of Nashua NH.

Scope of Work

Design-Build a NFPA and Bus-Garage Code Compliant separated CNG Repair Bay in the BPW Garage, 9 Stadium Dr. Nashua, NH; the upgrade of the garage bay (2500 SF) included common separation walls, doors and glazing meeting 2 HR Fire Rating; provide an intrinsically safe area in 18″ space below ceiling and a Gas Detection and Control System. Specifically:

*Separation Walls – 2 Hr Fire Rated :

   >   6’ high CMU wall with drywall above to ceiling

   > 14’ W OVHD Common Door/3 Hr Rated with Explosion proof motor and fire links

   >  2 Hr Rated Mandoors

*Provide an Intrinsically safe area 18″ below Ceiling :

   >  Relocate all electrical conduits, fixtures, outlets and lighting 24″ below ceiling

*Wall & Roof Exhaust Fans to Provide Five(5) Air Changes per Hour (ACH)

*Steam Unit Heater

*Replace Exterior OVHD Door Motors with Explosion Proof Motors

*Gas Monitoring and Control System

   >  Gas Monitoring Control Panel with 911 Dialer, Audible & Visible alarms

   >  Control panel to activate OVHD Doors & Exhaust Fans

   >  4 LPG Gas Sensors

Project was Federally Funded and Construction was Davis-Bacon Act Wage Rate compliant.

Work was 100% bonded.

     Also, this Design & Build Project was completed on-time, at Contract Cost (no change orders) and with quality workmanship. The quality, detail and responsiveness of the Design-Build Team and the outstanding cooperation of the BPW Garage Staff promoted the successful Project Delivery.

We would be pleased to provide services for your CNG Garage Upgrade.

Please Contact

DL King & Associates, Inc. / Art King PE

at 603.883.5880

or E-mail