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Trial Hole - Case Study
Feasibility study / trial holing using Conroys Group suction excavator
This case study shows an example of the “cradle to grave” process already carried out on numerous projects for various clients by the Conroys group.  The conroys group can carry out as little or as much of the following process depending on the client’s requirements.

The feasibility study was carried out on an area called Moxley within Wolverhampton, Staffordshire for Enterprise working on behalf of Severn Trent water.


Trial holes were identified and pre sited to identify engineering difficulties and ensure fluidity with the ultimate aim to identify service density and hence water main renewal techniques for a scheme totaling 14km.
Feasibility process

   1. Extent of works is identified and an overall plan
       developed with technique proposals identified by the
       client (i.e. new main size requirement).
   2. Supervisor visits site and plots locations of trial holes
       in order to optimise information and ensure
       engineering difficulties are identified and mitigated
       before commencement of works.
  3. Program is compiled (see example pdf) and issued to
       client with commencement dates and identified
       engineering difficulties to ensure accurate noticing to
       local councils and transparency of works.
   4. Works commence with on average ten to fifteen trial
       holes being completed per day (Depending on ground
       conditions/engineering difficulties) with full chapter 8
       and traffic management utilised as required.
   5. Once excavated services are colour sprayed to
       highlight their existence, photographed (See Photo 1
       & Photo 2) and dimensions measured and recorded
       on a detailed trial hole log (see example report) and
       issued to the client or the Conroys group design team
       for interpretation.
  6. Once images and information are captured trial holes
       are backfilled and reinstated (Often 90% of
       excavations are completed within three hours of
       excavating) and closing dimensions forwarded to the 
       client for noticing purposes.

Information is collated and a design technique proposal issued to the client for their perusal (see map pdf).
Trial Hole Documents
(click to enlarge):
Photo 1
Photo 2
> Report
> Map
> Programme
trialholes001 trialholes002