General Quality Guidelines
Invitation to bid
The invitation to bid is one of the most important documents in the preparation of a project. Within this document, the client defines the guidelines and boundary conditions for the project. Precise definitions in this document will allow an adequate comparison of the different bids and is a good basis for an order or contract.
  • Overall objectives of the proposed project
  • Goals of the specific investigation
  • Links and interrelation to other investigations
  • Proposed methods
  • Site map
  • Boundary conditions (time window, access to ground, infrastructure etc,)
  • Project organization (project manager, directions)
Methods and / or targets
Dependant on the know-how of the client, the target for the investigation and/or the proposed method must be specified.


  • Size, depth, continuity, contrast of physical parameters to the surrounding rock
  • Expected accuracy of the result (quantitative or qualitative)


  • general description
  • measurement design (2D or 3D investigation, measurement points or lines and spacing)
  • measurement parameters (e.g. minimum recording length, resolution)
  • processing parameters
  • interpretation method

Even if the method is specified, it should be explicitly allowed that the contractor offers an alternative method or lay-out in addition to the specified one.

Existing information
  • existing geological maps and cross sections of the area
  • results from other measurements
  • known problems at the site (electrical or seismic noise, difficult terrain, soft ground etc.)
  • information on possibly buried dangerous materials (explosives, chemicals, waste etc.)
  • specification of report outline and format
  • expected products (e.g. maps or cross sections with scales)
  • raw data presentation and formats (analog, digital)
  • data processing and display specification
  • required QC level
  • equipment tests and certifications
  • on site quality checks
The general basis for the quotation has to be defined. Possibilities are
  • turn-key projects (with costs per measurement or test)
  • effective time (with costs based on hourly rates for personnel and equipment)
  • lump sum (for the execution of the predefined project)
The different types of quotation have different risks for client and contractor. Quotations based on effective costs should only be chosen if an adequate surveillance by the client or his consultant is guaranteed. For the other cases it is necessary to precisely define the measurement design and the products. In all cases, it is necessary to define:
  • cost of stand-by times which are out of the responsibility of the contractor
  • force majeur
  • possibility and costs for interruption or cancellation of work