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Dewatering and groundwater control | Stuart Well Services Ltd

Case Study

Pumping Tests: Lower Thames Crossing

Client: Perfect Circle
Location: Gravesend, Kent
Duration: April 2019 – Aug 2019

Project Overview

As part of the site investigation phase of Lower Thames Crossing. Stuart Wells undertook a large scale Pumping Tests for Perfect Circle/Highways England.

The Objectives of the Pumping Tests

  1. 1. Two pumping tests were undertaken in accordance with BS ISO 14686:2003 to determine localised hydrogeological characteristics of the Seaford Chalk formation to support the development of the Lower Thames Crossing preliminary design.
  2. 2. The testing also provided the necessary hydrogeological data required to support applications for the necessary Environmental Permits for groundwater abstraction and discharge.

Pumping Test – Scope of Works

  • All temporary works requirements including welfare and track matting.
  • Drilling and installation and development of all chalk abstraction, recharge and monitoring wells.
  • In-situ hydraulic testing.
  • Provision and installation of pump testing equipment (including generator power supply), data logger monitoring of observational wells, water sampling and analysis, as well as factual reporting of the results obtained.
  • Downhole level loggers & VW piezometer were utilised to measure groundwater levels.
  • MAG flowmeters with dataloggers recorded abstraction flow.
  • We undertook groundwater sampling and analysis together with field parameter water quality data throughout the test period.
  • Pumping Tests in accordance with BS ISO 14686:2003.
  • Surface water level monitoring.

Accreditations and Associations

ISO-9001 ISO-14001
ISO-22301 ISO-45001
The Temporary Works Forum (TWf)