“New Rossington” – CCTV Inspection, Investigation & Data Management


A main Principal Contractor, working in partnership on an AMP 5 Framework, for a major Water & Sewerage Company approached CALM Drainage Solutions Ltd, to try to resolve pollution problems in one of their Client areas. The problems had persisted for the past 12 to 15 years. Reactive works on a need to resolve basis, as they occurred, had tended to be the resolution method adopted. Some 11,000 metres of aging sewer of diameters varying between 100mm to 675mm, had been identified for specialist investigation. Some limited information from previous work was available, which included silt level indications for some pipe lengths. Little other information had been documented.

Issues identified were:

  • Numerous blockages being reported giving rise to pollution incidents within private property and on the highway.
  • Increased costs to carry out repairs on a reactive basis.
  • Little or no historical information about the types of repairs carried out.
  • No serviceability or structural condition of the existing sewer network was known.
  • Numerous customer complaints, resulting in Service Incentive Mechanism (SIM) suffering.
  • Inability to fix budgets due to the random manner in which incidents were occurring.
  • Little data relating to the assets attributes.
  • No information relating to the assets condition.

A Calm Solution

CALM discussed the scheme with both the contractor and his Client. In order to produce a cost for the scheme the following was adopted:

  • A meeting took place with the principal contractor with the objective of gathering as much information relating to the sewers and area.
  • A plan of the area showing the sewers to be investigated, was produced. Each sewer length to be investigated was numbered and the upstream/downstream node added.
  • A detailed data sheet was formulated. Data included pipe reference, location – street name, type of traffic management required, pipe diameter, length, depth to invert, historic notes if applicable, indication of silt levels, pipe material.
  • A detailed site visit to determine complexity of traffic management – 2 way/3-way lights etc. access restriction, sewers that fell within private properties, types e.g. covers i.e. gatic covers, location of overhead cables that may impact on site set ups, location of fire hydrants, potential site compound locations etc.
  • Based on the site visit and information gained a detailed programme of work could be established. Based on good effective communications and known deadlines for project delivery, applicable operational resources was built into the programme, thus ensuring delivery to the deadline.
  • Once the programme had been agreed a target cost could then be established. The target cost mirrored the programme durations and all work activities showed labour, plant, material and sub-contract breakdowns.
  • Based on the fact that there were many unknown factors such as silt levels, condition of sewer, unavailability of CCTV footage, a risk register was established. The risk register made provisions for the fore mentioned, as well as construction risks, geotechnical risks, commercial and design risks.
  • A further meeting took place to discuss the submission. As the contract did involve risk, but operational progress needed to be maintained, the most applicable form of contract to be adopted was the NEC Option C. This form of contract encourages the collaborative approach adopted by all parties which leads to reduced risks inherent in any construction scheme.
  • Once the target cost had been agreed a contract “Expenditure Profile” was drafted to monitor weekly costs and to report against the agreed target cost.
  • Open and honest communications were maintained during the contract which resulted in wholehearted project success.

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