Quality and safety

Top quality and safety come first. This is the starting point for all our activities. We place high demands on ourselves. We invest and are constantly immersed in new techniques and developments. Our experienced, accurate and driven team works with high-quality drilling machines in accordance with statutory regulations and with all the required certifications. We are proud to say that we have been providing our clients with representative and high-quality soil samples for 27 years.

The right certificates

We work according to all legal guidelines and requirements that apply to the relevant field surveys. Safety for our employees and the environment is an integral part of our management system. Sialtech is in possession of all required certifications. We have the most complete safety certificates ISO 45001 and VCA**.

Sialtech is certified for:

  • NEN-EN-ISO 9001:2015 – General Quality Management
  • VCA** 2017/6.0 – HSE Management
  • NEN-ISO 45001:2018 – HSE Management & legal compliance
  • BRL 1000 (protocols: 1001 and 1002) – Representive sampling of soil and construction materials NL
  • BRL 2000 (protocols: 2001, 2002, 2003 and 2018) – Execution of Environmental Fieldwork NL
  • BRL 2100 (protocol: 2101) – Execution of mechanical drilling NL
  • BRL 6000 (protocols 6001 and 6002) – Environmental guidance on land reclamation NL
NEN-EN-ISO 9001:2015
VCA** 2017/6.0
NEN-ISO 45001:2018
BRL 1000 Dutch certification: Sampling for batch tests
BRL 2000 Dutch certification: Fieldwork for environmental soil and sediment investigation’
BRL 2100 Dutch certification: Mechanical drilling
BRL 6000 Dutch certification: Environmental supervision of sediment and soil remediation, intervention in sediment and aftercare
Experienced field workers

Each specialism includes training- and experience requirements. For our projects, we use experienced fieldworkers who meet all the associated requirements (paragraph 3.2.2 of BRL 2000). All field staff have a registered Dutch recognition for carrying out environmental fieldwork. They receive an annual audit and a medical examination. Our trainees and fieldworkers in training are intensively supervised and always work together with at least one registered fieldworker on location. Our independent fieldworkers are in possession of the following certificates:

  • Basic safety VCA
  • Soil description
  • Asbestos recognition
  • Company Emergency Response

Due to the rapid technological developments and the ever-increasing training- and experience requirements of our customers, governments and regulatory bodies, there is an increasing degree of specialization. Sialtech’s field employees have the following specialisms:

  • Fieldworker environmental soil research
  • Field researcher geotechnics
  • Certified sampler
  • Drill master
  • Asbestos expert field researcher
  • Environmental supervisor
Safe equipment

It goes without saying that all our equipment is equipped with all the necessary safety requirements. The right knowledge and experience is required to control the drilling machines and to supply high-quality samples. That is why we always use our specialized crew for this purpose.


We play an important role in the Dutch regulations when it comes to environmental soil research. From the outset, we have been involved in drawing up Dutch guidelines for soil drilling and sampling for the purpose of environmental soil research. With the membership below, we are committed to maintaining and further developing the quality of the guidelines and certifications for soil management in the Netherlands.

Member VKB

Vereniging Kwaliteitsborging Bodembeheer (Dutch association for quality of environmental soil survey). Henk Nijmeijers (director of Sialtech) was chairman of the section measurements within VKB from 2015 to 2018.


Member SIKB

Stichting Kwaliteitsborging Infrastructuur voor Bodembeheer (Network set up to continously and structurally enhance the standards of soil management in the Netherlands). Henk Nijmeijers (director of Sialtech) was chairman of the section measurements within SIKB from 2002 to 2017.