S&M Engineering (SNM) Services is a minority-owned consulting engineering business. It is owned by Mr. Subijoy Dutta, a registered Professional Engineer (P.E.), who won the 1991 National Award for Individual Excellence in Environmental Restoration from the U.S. Air Force. In August 2009, S&M Engineering had its 25th anniversary marked by two decades of growth and success.

Please Click here for a short bio of Mr. Subijoy Dutta

Some nationally known professionals and engineers, such as Dr. William E. Roper, P.E., Mr. Dennis Haag, and Dr. Matthew Perry are retained by the company as outside consultants. S&M Engineering has also established an active partnership agreement with Pure Water Corporation (Mr. William Danshin, President) in Nanaimo, British Columbia, and Pinnacle Equipments Pvt. Ltd., (Mr. P G Banerjee), Jyotiba Nagar, Pune, India.

Please Click here for a short bio of Dr. Bill Roper

S&M Engineering (SNM) LLC is a new edition of S&M in Crofton, Maryland. SNM does not have any full time employee. The shareholders include the sole membership of Subijoy Dutta and his assignees as advised and recommended by S&M’s Financial Advisor, Donald G. Henry, NTPI-Fellow.

S&M Engineering also established a subsidiary and Registered office in Kolkata, S&M Engineering Services, 352/3, M.B. Road, Birati, Kolkata (Trade License ID – 9770). The project activities there are run by Mr. Sucharit Dutta, a full time Project Manager/Coordinator of S&M Engineering Services, Birati, Kolkata, India. Mr. Tushar Kanti Guha provides routine advice to the S&M activities at the India office as a Senior Advisor/Business Manager.

In addition, S&M Engineering has established a center in New Delhi, India for business development and National level project coordination. Mr. Girish Chaudhry, LLB is a the project coordinator in New Delhi, India. Mr. Girish Chaudhry covers business promotions and coordination with the State of Delhi, UP, Haryana, and Punjab. S&M Engineering LLC is pleased to announce that Mr. Swapan Dutta, B.E. (Mech) from Kolkata, India has recently joined the S&M Engineering team for projects involving expertise in Sewerage and Drainage Pumping Systems and other Water Management systems.


S&M Engineering (SNM) provides technical expertise in all phases of environmental management, beginning from preliminary investigation to final cleanup in compliance with locally-applicable regulations. From studies, planning, remedial design to treatment, installation, and construction management, all are undertaken by our engineering consulting services. Within each project phase S&M has developed the ability to adapt and use the most cost-effective and site-specific techniques available. S&M Engineering Services is headquartered in Crofton, Maryland, USA, and has offices in eastern Oklahoma, and Texas. Our offices are staffed with top level professionals and field staff, including:

  • Civil & Environmental Engineers
  • Geological Engineers
  • Chemical Engineers
  • Database Specialists
  • Mechanical Engineers
  • Electrical Engineers
  • Computer Scientists
  • Environmental Specialists
  • Ecologists
  • Soil Scientists
  • Geologists
  • Hydrogeologists

S&M Engineering's staff and associates have experience in environmental and ecological studies, including, permitting, design, and construction management. We have conducted many water use studies, estimating future needs including potential area growth projection, dating back to the early 1970s. The total staff strength of S&M varies project wise since most people are on consultant basis.




Mr. Subijoy Dutta, P.E., a registered Professional Engineer, provides overall direction to all technical projects of S&M Engineering. He has extensive experience in Remedial investigations, Feasibility studies (RI/FS), Remedial Design, and Remedial Actions (RD/RA) pertaining to the CERCLA regulations. He is the author of the book "Environmental Treatment Technologies for Hazardous and Medical Wastes - Remedial Scope and Efficacy" published by Tata McGraw Hill in March 2002. He has also co-authored a book titled "Sustainable Mining Practices – A Global Perspective" published by Taylor & Francis in July 2005.

Mr. Tushar Kanti Guha a science graduate from Shillong, Meghalaya has over 35 year's comprehensive techno-commercial experience in project execution and marketing, sales and contract operations, out of which 22 years in the Senior Management Positions in the reputed engineering industries for the core sectors of the economy like steel, coal, power, paper, aluminum, cement, and fertilizers. He has interacted with the local communities in Salt Lake, Kolkata concerning waste management, recycling, reuse and composting of residential and local business-generated waste.

Dr. Prakasam Tata, P.E., ex-Director of Chicago Wastewater Plant, and Author of the book VOC Emissions from Wastewater Reclamation Plants: Characterization, Control and Compliance, CRC Press, March, 2003. Dr. Tata has worked in an advisory capacity in the Deep Pond system design and installation in 2004 by S&M Engineering in Hyderabad, India with his strong background and experience in the environmental engineering and science profession dealing with the design. With management of problems associated with water, wastewater treatment, water quality, sludge treatment, emissions (Odors & VOCs), control and climate Change, Dr. Tata has been an invaluable advisor for S&M Engineering for the past fifteen years.

Dr. Hilary Inyang is one of the top ten geotechnical engineers in US and author of the book "Geoenvironmental Engineering", which was released by the Pennwell Publishing Company. This new book (retail price US $150.00) has been used as a text book in many environmental engineering curriculum in US and overseas since fall 2000. has been used as a text book in many environmental engineering curriculum in US and overseas since 2000. Dr. Inyang is now the Vice president, Engineering at Botswana International University of Science and Technology.

Dr. Amy Townsend researches and writes on cultural and environmental sustainability, intellectual property rights, and management of commons and protected areas. The impacts of coastal and marine tourism, and developments on human populations and the environment including the global environmental change are also her major areas of focus. She has contributed to two United Nations reports, and studied land-based sources of marine pollution in the wider Caribbean. She has also participated in the committee for the National Institute on the Environment's work on the environmental effects of stratospheric ozone depletion, and investigated methods for environmentally sound and culturally appropriate community and building design. Dr. Townsend has numerous publications. One of her books, "Green Business: A Five-part Model for Creating an Environmentally Responsible Company", published by Schiffer Publishing is in popular use by a number of companies in the US and internationally. With the recent focus on climate change in COP21 her approach to sustainability is further underscored.

Dr. William E. Roper's professional experience includes senior management positions in the U.S. Department of Transportation, U.S. Environmental Protection Agency, and the Army. He also served on the faculty of the University of Wisconsin, Michigan State University, and North Carolina State University. Dr. Roper was recently appointed to the new National Academies Committee on the Protection of Critical Transportation Infrastructure and selected to chair the sub-committee on Technology Research, Development and Deployment. He has also been active with the Water Science and Technology Board, the Infrastructure and Constructed Environment Board, and the Transportation Research Board of the National Academy of Engineering, as well as the Society of American Military Engineers. He was a member of the National Oil Spill Research Committee, the National Aquatic Nuisance Species Task Force, Construction Industry Strategic Development Council, National Civil Engineering Research Council, and U.S. Co-Chairman of the Geospatial Data Management Task Committee under the U.S.-Japan Natural Resources Agreement. He has authored more than 100 technical papers and delivered numerous presentations to national and international audiences. He is also President and Founder of Roper and Associates, a Virginia Corporation created to provide engineering and environmental consulting services to the global community.


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