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Suggested information for inclusion in approval trial agreement

Before starting an approval trial, the following information should be considered by both parties for inclusion in the approval trial agreement.

General information

  1. Parties to trial – names of undertaker and authority agreeing to approval trial
  2. Confidentiality – parties (if any) to whom trial information may be divulged
  3. Geographical extent of trial – county or district border, utility region or area boundary
  4. Scope of trial – total number of trial reinstatements or maximum number of sites
  5. Time limit for trial – start/end dates
  6. Termination criteria – conditions under which agreement may be ended and notice of termination
  7. Signatories/witnesses – approved officers of appropriate seniority who are permitted to commit their organisation to the execution of the approval trial and who can approve the terms and conditions of the trial
  8. Record of sites where the ARM or AT has been used and dates of installation


  1. Contemporary records – details of records required, responsibility for record-keeping
  2. Notification details – notice periods, arrangements for contacting relevant parties to an approval trial
  3. Attendance at trials – parties who may attend an approval trial
  4. Review periods/meetings – dates, participants, procedures for calling ad hoc meetings
  5. Post-construction assessment – test methods to be employed and arrangements for periodic surveying, sampling, etc


  1.   Type of trial site – routine utility excavations or specially excavated approval trial
  2.   Location of trial site – non-high-amenity or non-high-duty footway, cycle track, (including road classification Type 2 to 4) etc
  3.   Positioning of trial site – “as excavated”, within wheel track, etc
  4.   ARMs or ATs to be trialled – generic SMR or SMF materials
  5.   ARM or AT details – Mix design, binder details, additives, dependencies on site conditions or excavated/base material type and condition, details of prior development work
  6.   ARM or AT preparation – batching, mixing and placement procedures.
  7.   Quality control on site – any tests to be applied to ensure that an ARM has been prepared to the required design
  8.   Compaction regime – NFSMRs and SMRs only
  9.   Sampling requirements – types of samples and sampling frequency
  10. Testing laboratories – contact details of accredited laboratories or otherwise
  11. Remedial measures for “failed” sites – replacement with an alternative SMR or SMF material or other approved material or remove from the approval trial agreement
  12. Future of trial sites – remove after trial completion or leave in place, future monitoring or testing
  13. Any specific assessment management or maintenance requirements.
  14. Confirmation of compliance with all SROH performance requirements; linked to inspection and defects