Charter Oaks Ltd
PO Box 496, Barnsley, South Yorkshire, S70 4WX
Tel 0870 432 7633, Fax 0870 432 7644, e-mail surveys@charteroaks.co.uk
Local Authority
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Charter Oaks Ltd PO Box 496, Barnsley, South Yorkshire, S70 4WX Tel 0870 432 7633, Fax 0870 432 7644, e-mail surveys@charteroaks.co.uk
Local Authority
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· Utility Location Surveys · Underground Mapping Surveys · Specialist Radar Surveys · Topographical Surveys · Void Location Surveys · Mine Shaft / Tunnel Location · Leakage Detection Surveys · Full AutoCAD Service · On Site Mark Out
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Case Study 2 - Local Authority As part of a town centre regeneration project the local authority wanted to identify all underground utilities and anomalies with a very specific remit requesting accurate depths of all utilities at regular intervals and also identifying any other sub-surface anomalies. The site was split into three areas covering a total of 1000 linear meters of town centre carriageway and footway, including entrances to multi-storey car parks, bus station entrance and taxi ranks. Due to the location of the survey the work had to be carried out, predominantly through the night when the town centre was at its quietest. The CLIENT gave us a copy of the majority of existing utility records for the areas to be surveyed; these records were checked for completeness then used to assist the surveyor in providing as accurate a drawing as possible. All work was undertaken with the appropriate use of signing, lighting & guarding as per Chapter 8 requirements. The site was then assessed by the senior surveyor and all covers were lifted, which were coned or barriered, where appropriate and was safe to do so. All relevant data was taken from cover lifting i.e. identification of service, depth indications and direction/connection of services, as required by the demands of the survey. Reference was spray marked on the ground surface using non-permanent, bio-degradable spot marking paint. Over each area, the RD4000 / Subsite 950RT locators are used in both ACTIVE and PASSIVE modes to identify any metallic or power carrying features. Wherever possible a direct connection was made to the utilities to ensure accurate results, where a direct connection is not possible then the transmitter (signal generator) was used to induce a signal along any metallic or power carrying features. A greater sweep was then carried out across the site using the RF locators to confirm and/or verify the previous information and to pick up on previously undetected services. All our findings were marked on the ground using coloured bio-degradable spray paint as before. Relevant grid positions were marked out, again, using bio-degradable spray paint or road chalk to enable us to utilise the GPR in the most efficient manner within all of the agreed locations. A series of scans were made, in two directions, to collect data within the survey extents, to detect any additional underground services and anomalies. All interpretation of GPR data was carried out on site to enable us to ensure all collected data was to the required standard, any data which did not meet the standard was retaken. All our findings were marked on the ground using coloured bio-degradable spray paint as before. A basic topographic survey was then undertaken “picking up” all our survey marks, this was then overlayed on the existing topographic survey provided by the client to produce the final AutoCAD drawing. Annotations and explanatory notes were appended to the drawings to explain anomalies and detected linear features that cannot be identified.
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