Childrey Warren, Wantage

July 2018

Risk Management Limited were contracted to undertake an intrusive Site Investigation along the linear route for a new watermain running from Childrey Warren Water Treatment Works (WTW) to Lark Hill Reservoir for Thames Water. Thames Water are committed to ceasing water abstraction at Childrey Warren WTW and the proposal to construct a link main between Lark Hill Reservoir and Childrey Warren WTW would allow this.

A total of fifteen geotechnical Trial Pits were undertaken using a Kubota mini-excavator and eight Rotary Cored boreholes, up to 25m deep, using a tracked Commachio 250 drilling rig at locations along the proposed link main route.

Laboratory testing included, moisture contents, Atterberg Limits, CBR tests, Compaction tests, pH and Water Soluble Sulphate tests, Saturation Moisture Content, Chalk Crushing Value, Natural Moisture Content of Chalk, Unconfined Compressive Strength and Point Load Index of Chalk and Contamination testing.

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