Thomas C. Sexton, P.E.

Tom Sexton is a Senior Project Manager for GZA, working from its Hingham and Norwood offices.  Tom brings more than 30 years of water resources engineering experience as well as a full range of support services to his post at GZA; he has served as a consultant to water suppliers and public works departments throughout Massachusetts, Rhode Island and Connecticut.   

His area of specialization is municipal water resources engineering. He earned his Bachelor of Science in Civil Engineering from Clarkson University.  He is a professional engineer licensed in MA.

David R. Carchedi, P.E., Ph.D.

Dr. Carchedi's. a Senior Principal has been with GZA for more than 30 years.  His areas of experience include soil and foundation engineering, with a major emphasis in the design of site improvement projects, deep foundations, marine structures, earth support systems, and other heavy construction.  His geotechnical experience is complemented with an extensive background in structural design. 

Rasim Tumer, P.E.

Rasim Tumer joined GZA’s Contractor Services Division in 2007. He has diverse experience in the heavy civil industry; specializing in geo-structural engineering services such as foundation design, temporary and permanent earth support structures, tunnels, temporary work trestles, reinforced concrete & steel design. His  technical background includes skills in AutoCAD and various computational, geotechnical and structural engineering software.

GZA Subcontractor Registry

GZA GeoEnvironmental, Inc.
Subcontractor Health & Safety Evaluation Questionnaire

Number of Fatalities (OSHA 300 Log Column G) in Previous Three Years
Use data from your company OSHA 300 log and 300A Summary log to complete the form below. For the EMR, list the interstate rate unless only an intrastate rate is available. (TRIR and DART rates equals number of OSHA recordable injuries times 200,000 divided by the total number of man-hours worked)
Experience Modification Rate (EMR) in Previous Three Years
Number of OSHA Recordable Incidents (OSHA 300 Log Column A) in Previous Years
Total Recordable Incidence Rate (TRIR) in Previous Three Years
Total Number of OSHA Recordable Incidents involving Lost Workdays, Restricted Workdays, or Job Transfers in Previous Three Years
Days Away, Restricted, or Transfer Rate in Previous Three Years
Average Number of Employees
Employee Hours Worked (excluding vacations and holidays) in Previous Three Years
You will be asked to attach copies of OSHA 300A/300 logs and EMR rates (using insurance-carrier letterhead) for previous 3 years using the upload fields at the bottom of this form.
Has your company received citations in the last 3 years?
If your company received any citations in the last 3 years from any government agencies, such as OSHA or EPA, upload a file describing each citation, action your firm took in response, and resolution. Include information as to the disposition of the citation. If there is no citations received in the last 3 years, check on No citations received in the last 3 years.
Employee Training
Files must be less than 2 MB.
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Upload OSHA 300A/300 logs and EMR rates for previous 3 years
Files must be less than 2 MB.
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Files must be less than 2 MB.
Allowed file types: gif jpg jpeg png txt rtf html pdf doc docx odt ppt pptx odp xls.
Files must be less than 2 MB.
Allowed file types: gif jpg jpeg png txt rtf html pdf doc docx odt ppt pptx odp xls xlsx ods xml.
Files must be less than 2 MB.
Allowed file types: gif jpg jpeg png txt rtf html pdf doc docx odt ppt pptx odp xls xlsx ods xml.
Files must be less than 2 MB.
Allowed file types: gif jpg jpeg png txt rtf html pdf doc docx odt ppt pptx odp xls xlsx ods xml.
Files must be less than 2 MB.
Allowed file types: gif jpg jpeg png txt rtf html pdf doc docx odt ppt pptx odp xls xlsx ods xml.
Files must be less than 2 MB.
Allowed file types: gif jpg jpeg png txt rtf html pdf doc docx odt ppt pptx odp xls xlsx ods xml.
Files must be less than 2 MB.
Allowed file types: gif jpg jpeg png txt rtf html pdf doc docx odt ppt pptx odp xls xlsx ods xml.
Files must be less than 2 MB.
Allowed file types: gif jpg jpeg png txt rtf html pdf doc docx odt ppt pptx odp xls xlsx ods xml.
Files must be less than 2 MB.
Allowed file types: gif jpg jpeg png txt rtf html pdf doc docx odt ppt pptx odp xls xlsx ods xml.
Insurance:
Does your firm agree to provide, pay for, and maintain in force at all times during the performance of any services for GZA and for the applicable warranty period, insurance in compliance with the example Certificate of Insurance (provided below) and of the Prime Contract, whichever is greater?
Your firm shall name GZA and the Owner/Client as "additional insured" on a primary and non-contributory basis for all policies, with the exception of Professional Liability. All policies shall contain a complete waiver by the insurer of subrogation against GZA and the Owner/Client. All such insurance policies shall contain a provision prohibiting cancellation except upon at least thirty (30) days prior notice to GZA, and will be primary in the event of a loss arising out of Subcontractor's performance and shall provide that where there is more than one insured, the policy will operate, except for the limits of liability, as if there were a separate policy covering each insured.
Files must be less than 2 MB.
Allowed file types: png pdf doc docx.
Please provide the name and title of an officer of the company to confirm and certify that the information provided in this form is current and correct.
*Misrepresentation of data requested is grounds for immediate termination of current subcontracts and disqualification from future consideration*

Ronald A. Breton, P.E.

As a member of the GZA team for over 24 years now, Ron Breton is a Senior Principal and Senior Vice President and possesses more than 38 years of experience in the environmental engineering field.  He is responsible for the management of a wide selection of environmental management, compliance, engineering, and occupational health & safety projects. 

Matthew A. Taylor, P.E.

Matthew Taylor joined GZA in 2007, is an Associate Principal and Vice President, and serves as the Technical Service Area Lead for GZA’s Dams Practice Group in the Metro-Boston office.

Matt’s areas of expertise include dam and levee safety inspections, seepage and stability analyses, Emergency Action Plans, small hydropower feasibility studies, development of dam rehabilitation contract documents, preparation of permit applications, and construction administration for dam rehabilitation and dam removal projects.

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