Framework for Drilling, Borehole Construction and Associated Works and Services
Description: The Mining Remediation Authority requires a framework agreement for the provision of services relating to the construction and rehabilitation of boreholes in former mining areas to support the objective to understand water levels and chemistry. The services are anticipated to include borehole drilling, construction, maintenance, cleaning, rehabilitation and associated works/services. The drilling will be predominately coal measures and overlying strata including regionally important aquifers (may need casing off). The targets will often be specific mining features, both void and collapsed. Drilling may be required in areas where multiple sets of workings are present which may create challenges. Targets and strata above and in the zone of influence of workings may be collapsed and/or fractured due to the effects of mining. Accuracy and verticality of borehole drilling will be (read more...)
Summary: The Mining Remediation Authority intends to establish a framework for drilling, constructing and rehabilitating boreholes in former mining areas. The work is intended to help the Authority understand groundwater levels and chemistry. Services are expected to cover drilling, borehole construction, maintenance, cleaning and rehabilitation, together with related works and services. Drilling will mainly be through coal measures and overlying strata, including regionally important aquifers that may require casing. Targets include underground mining features, both void and collapsed, and may lie beneath ground affected by multiple workings or fractured and collapsed strata. Delivery is planned across England, Wales and Scotland. Accurate, vertical drilling is important because targets can be small and hundreds of metres deep, and the completed boreholes must support later surveying, sampling and pumping.