Staff

 

Stephen T. Hall, President, President, CPG, MS, Geochemistry, PhD program, Geochemistry

  • Development and design of unique proprietary quantitative remedial diagnostics and consequent installation of both pre- and post-construction remedial systems for radon, water vapor and numerous hazardous vapors in schools, commercial buildings and homes
  • Research and several professional presentations of his proprietary diagnostics and design of radon mitigation systems, including the 1990 EPA International Radon Symposium and other early EPA and AARST symposia, on the correlation between radon remediation techniques, construction/HVAC factors, indoor radon; and using geology and the prediction of radon sources to remediate schools, large buildings and older difficult homes..
  • Contributed to the EPA Radon Mitigation Standards and the EPA document on Model Standards and Techniques for Control of Radon in New Construction.
  • Derivation of a proprietary equation to predict the fan with the correct CFM and negative pressure to utilize depending upon sub-slab pressure field extension and other factors appropriate especially to large buildings.
  • Development and implementation of radon soil testing techniques for determining indoor radon potentials.
  • Design and installation of vapor extraction systems by sub-slab, block wall, and crawlspace depressurization for radon and various volatile and flammable compounds. 
  • Former Adjunct Professor and Research Associate on the George Mason University Radon Research Project.
  • Certified Professional Geologist-VA#2801000701
  • Certified Professional Geologist-AIPG #11543
  • Charter Member, National Radon Association; Member, AARST
  • Prime Contractor Associate-EPA Office of Radiation Programs and EPA Office of Research and Development
  • NRSB Certified in Radon Mitigation #GSS612 RRS
  • NRSB Certified in Radon Testing #7SS0084
  • EPA RPP #122340T.

 

Peter Semak, VP & Operation's Manager

  • Installation and design of over 10,000 radon and other VOC remediation systems since 1999 in a variety of structural complexities.
  • Design and implementation of quantitative remedial diagnostics.
  • Design of commercial radon and other vapor intrusion systems
  • NEHA Certified in Radon Mitigation # 102059 RMT

 

Paul Villacorta, Chief Technician

  • Installation and design of over 5,000 radon and other vapor intrusion remediation systems since 2000 in a variety of structural complexities.
  • Design and implementation of quantitative remedial diagnostics.
  • Apprentice Electrician
  • NRSB Certified in Radon Mitigation #8G0006

 

John North, Chief Technician

  • Installation and design of over 3,000 radon and vapor intrusion mitigation systems since 2010 in a variety of structural complexities.
  • Design and implementation of quantitative remedial diagnostics
  • NRSB Certified in Radon Remediation #15G017

 

Julie Blando, Office Manager

        • Scheduling of thousands of radon and other vapor intrusion mitigation systems since 2005 in a variety of structures.
        • Preparation of thousands of remediation proposals, guarantees and invoices.
        • Explaining remediation systems and answering both frequently asked and detailed questions.  

 

Other professional staff member qualifications

  • PhD and MS degrees in geochemistry.
  • PE in Mechanical and Civil Engineering.
  • Various Assistant Technicians with many years of radon and vapor intrusion system installations.
  • Professional construction experience in plumbing, roofing, electrical, and carpentry.

 

CERTIFICATIONS, INSURANCE AND LEGAL REQUIREMENTS

  1. Radon Mitigation Certifications:
        a. EPA Mitigation Registration # 2045400,  # 18031, and#122340T,
        b. National Radon Safety Board (NRSB)
        c. National Radon Proficiency Program (NRPP)
  2. Virginia Department of Professional and Occupational Regulations (VDPOR)
    #2705015147 with RMC (Radon Mitigation Contractor) Specialization
     
    Click on “License Lookup” and enter our number.
  3. Maryland Contractor’s License #15716498
    (license # changes every year)
  4. Maryland Home Improvement License #31106
    Click on “License Search” (license # changes every 2 years)
  5. West Virginia Business License: #2001-8345
     
  6. West Virginia Radon Contractor License #RC000054, TEL: (304) 558-2981
     
  7. Insurance: $2,000,000 aggregate, $1,000,000 occurrence