DNC is committed to optimal customer satisfaction, public contribution and good-faith efforts toward environmental conservation and improvement via reliable production. Focus is invariably placed on customers and on quicker, more economical and superior production based on technological advances and accumulated expertise. The organization is fully committed to environmental conservation, safety and compliance, and actively pursues technological development to keep up with rapidly changing public environments and client needs.
The highest priority is placed on customer satisfaction and environmental conservation/improvement through activities of us.

Environment policy

【Environment/safety/quality policies】 With a philosophy of respect for people, DNC strives to maintain and improve its public profile, recognizes the developing needs and expectations of related parties, and pursues ongoing growth toward the future through activities of us. The company identifies risks related to needs and expectations to boost its value via stringent compliance, good-faith interaction, staff development and ongoing improvement of its effective management system.


CSR committee CSR activities are conducted in line with the company’s code of conduct. Our public contribution is pursued in line with the company’s environmental goals and targets.

Environmental conservation
creation activities

DNC environmental conservation/creation activities in FY 2019

General goals Specific targets FY 2019 targets FY 2019 evaluation FY 2020 targets
Environmental management Improved environmental management All departments
Activities for improved environmental management

Promotion of environmental protection/public contribution activities
1) Activities for improved environmental management
(i) Response to laws, regulations, environmental risks and similar
(ii) Disclosure of environmental information
(iii) Promotion of PR activities for related parties

2) Promotion of environmentally friendly design
(i) Technological development/design/proposal in relation to low-carbon/recycling-oriented/nature-symbiotic considerations and measures to prevent issues with chemicals

- Support for recovery from Yoshida river basin damage caused by Typhoon No. 19 in Miyagi Prefecture
- Hosting of interns and on-site tours at sites in Japan and abroad
- Real-time display of noise and vibration levels via large panels installed on temporary fencing
- Mist spraying along temporary fencing when dust meter trigger values are exceeded
Promotion for improvement and application of environmentally friendly design and conservation technology Business Promotion/Design
Environmentally friendly design/proposals
Building Construction/Civil Engineering
Design change, VE proposals and innovation, including environmental measures
Low-carbon promotion Global warming countermeasures in construction and design Construction/civil engineering
Reduction of CO2 emissions from construction
Construction/civil engineering
23% reduction in CO2 output per unit of completed work (t-CO2/\100 million) from the FY 2005 – 2012 average

Civil engineering
Construction/civil engineering
26% reduction in CO2 output per unit of finished work (t-CO2/\100 million) from the FY 2005 – 2012 average
- Effective on-site use of surplus soil
- Energy-efficient construction machinery/vehicles
- Design/construction of ZEB and energy-saving buildings
Reduction of annual energy consumption
8% reduction from FY 2015 Satisfactory 10% reduction from FY 2015
- Lights-off during lunch breaks, appropriate air-conditioning temperature control
- Promotion of Cool Biz/Warm Biz initiatives
Recycling-oriented promotion Measures relating to construction byproducts
Reduction of construction byproduct output through separation/disposal and appropriate treatment
Construction/civil engineering
Improved byproduct separation (excluding concrete, asphalt, debris and sludge)
80% or more
Civil engineering
85% or more

Civil engineering
80% or more
Civil engineering
85% or more
- Reduced construction-sludge production in shield and SMWV work
- Reduced woodchip output based on system forms, steel forms and pinpoint support
- Reduction of packing material output
Nature-symbiotic promotion Biodiversity conservation and sustainability Construction/civil engineering
Promotion of technological development and biodiversity conservation

Promotion of biodiversity conservation and sustainability in construction work
1) Promotion of sustainability based on biodiversity conservation and natural-environment development
(i) Measures for biodiversity conservation in planning
- Research on/proposal of measures for symbiosis with various organisms in construction planning
(ii) Measures for biodiversity conservation in construction
- Promotion of activities for biodiversity conservation in construction

- Transplant of coral from a sewage plant construction site in Papua New Guinea
- Transplant of Christmas orchids from a solar panel installation site to a green area
- Adoption of special lighting appropriate for mountain hawk eagles in tunnel construction
- Protection of a Little Tern nesting ground during the breeding season at a development work site


Promotion of on-site efforts for biodiversity conservation and sustainability (FY 2019)

International Division

During DNC’s construction of a full-scale sewage facility in Papua New Guinea’s heavily populated capital (Port Moresby), coral from the local coastal reef was transplanted to another site to protect the rich marine environment from treated sewage to be piped into the sea (Port Moresby Sewerage System Upgrading Project/Papua New Guinea).

Eastern Japan Regional Branch

Based on information from Fukushima Prefecture’s Nature Conservation Division on rare wild flora and fauna, Christmas orchids at a solar panel site for a power plant to be constructed in the prefecture’s Nishigo Village were transplanted to a green area in the interests of nature conservation.

Installation and operation of heavy machinery were implemented gradually over a two-day period prior to construction to reduce effects on locally nesting ospreys

Central Japan Regional Branch

In consideration of mountain hawk eagle habitats near work sites, hoods were used to prevent excessive brightness from lighting.

LED lighting was used instead of conventional mercury lamps to reduce appeal to moths, beetles and other insects. This helped to maintain the local insect population and provide an ongoing source of food for frogs, lizards and raptorial species, thereby minimizing damage to the ecological food chain.

Western Japan Regional Branch

The Wildlife Protection and Hunting Act prohibits wild animal capture and bird egg collection/damage. Against this background, seasonal breeding among Little Terns was redirected from a construction site by installing nylon strings and streamers made of bird-repelling tape, and an alternative breeding ground was set up elsewhere.

Leafnose bat inhabitation was monitored during work.

Temporary rice paddies have been created to support the local heritage maintenance Club’s public cultivation of ancient rice varieties on the site.

Environmental conservation

DNC’s environmental conservation efforts include measures to mitigate global warming and reduce local noise/vibration.

Environmentally friendly construction machinery is used at numerous work sites, and banners are posted to promote employee awareness.

Fun to Share initiative

DNC embraces the Fun to Share initiative as part of its global warming countermeasures. Corporate efforts are listed, and all employees and field workers contribute.

Promotion of carbon-neutrality via the promotion of resource/energy savings

The Fun to Share initiative (previously Challenge 25) promotes carbon-neutrality based on sharing of related expertise. DNC supports the initiative via the following efforts:

  • 1.Use of environmentally friendly products

      ・Green procurement of recycled items and environmentally friendly machinery
      ・Reuse of files and other items
      ・Use of energy-efficient office equipment
  • 2.Separation of waste

      ・Maximization of separated-waste usage
  • 3.Promotion of fuel-saving vehicle usage

      ・Participation in the Idling Stop campaign
      ・Avoidance of aggressive vehicle start-up/acceleration
  • 4.Reduction of energy consumption

      ・Maintenance of air conditioning limits of 28°C for cooling and 20°C for heating.
      ・Promotion of the government’s Cool Biz and Warm Biz initiatives
      ・Turning off of lights whenever possible
  • 5.Reduction of water consumption

      ・Placement of “Save water” requests and other notices around faucets to reduce consumption

DNC Participation in the Fun to Share initiative

Construction byproducts

DNC seeks to meet targets for construction byproduct separation as part of its environmental goals, disposing of byproducts appropriately in accordance with a manual outlining procedures for related handling at work sites. The company also actively manages byproduct disposal based on an electronic manifest, and runs a collective industrial waste management system to monitor and manage disposal records on its intranet.

Collective industrial waste management system screen for waste record input

Construction byproduct disposal manual

Public contribution activities and internal/external communications

Promotion of on-site efforts for biodiversity conservation and sustainability (FY 2019)


DNC actively contributes to local tree-planting and beautification activities.

On-site tours

On-site tours are conducted to raise local awareness of construction site environments and procedures.


Opportunities to experience construction industry work are provided to students in Japan and young engineers in other countries.

Activities at project site

Local exchanges were promoted via a sports event and equipment donation (Kingdom of Bhutan).


DNC actively presents its technologies to facilitate interaction with related parties.

Environment posters

To raise awareness of the company’s environmental conservation activities during the annual Environment Month, DNC invites employees and their friends/family members to submit posters relating to the environment. Those chosen are displayed in offices and on work sites.