Site Investigation & Contaminated Land Services

Tender description

This framework is for the provision of site investigation & contaminated land services to support in the in-house geotechnical team, throughout the Wessex Water region. Lot 1: The scope of the Agreement will be to undertake the following (but not limited to): • Completion of sampling and testing for soil, water, gas and chemical investigations • Determination of appropriate drilling or sampling methodology depending upon anticipated ground conditions • Production of desk top study in accordance with relevant standards • Provide full-time technical site supervision in accordance with CDM (Construction Design Management Regulations) with a suitably qualified and experienced geotechnical engineer(s). Including (but not limited to) setting-out, cable avoidance, logging (soils and rocks), client liaison, daily reports, preliminary logs, production of CDM documentation. • Produce AGS. Format digital data • Construct boreholes through cable percussive, window/windowless sampling, rotary and / or Resonance drilling techniques. Complete logging, sampling and in-situ testing in accordance with BS standard and Eurocode, including provision for sample storage. • Excavation of trial pits / trenches / observation trenches. Completing logging, sampling and in-situ testing in accordance with British Standard and Eurocode. Including provision for sample storage. • Complete in-situ testing including (but not limited to); Standard penetration testing and shear vanes, cone penetration testing, dynamic probing, permeability testing, pressure meters and dilatometers. • Undertaking laboratory tests at UKAS accredited laboratories who currently operate/hold BS EN ISO/IEC 17025:207, according to Wessex Water’s specified suites of analysis. Specific testing criteria include: geo-environmental; soil fertility; assessment of coal tar; groundwater suitability assessment for abstraction/discharge. • Preparation and submission of factual and interpretive reports, with summaries of potential environmental and health and human health risks as applicable. Reports should be approved for issue by a Registered Ground Engineering Professional. • Recommendations on appropriate soil / rock design parameters for foundations, retaining structures, excavations, ground permeability and earthworks. For both permanent and temporary works, where interpretive reports are requisitioned. The scope of works may be notifiable and therefore will require the Supplier to act as a Principal Contractor and/or Principal Designer. These activities may be carried out on a Wessex Water construction site or at an operational works/asset, on a site belonging to third party (e.g., a private property), or in the highway. There is no fixed programme of these Services and all services will be required on an adhoc basis with no guarantee of spend or volumes.