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<p>Any discharges of water from the HS2 project to the natural environment require
discharge consents, approved by the regulator – the Environment Agency (‘EA’), as
specified in Schedule 33 Part 5 of the High Speed Rail (London – West Midlands) Act
2017.</p><p> </p><p>There is an agreed consent to discharge water from the South Ruislip
Vent Shaft site to a drain that discharges to the Yeading Brook. The conditions for
this state the maximum limits of the following parameters:</p><p> </p><ul><li>Total
daily discharge volume - 3024m<sup>3</sup>/day</li><li>Rate of discharge - 35 litres
per second</li><li>Suspended solids - 50 mg/l</li><li>pH - 6 to 9</li><li>Sulphate
- 2000 mg/l</li><li>Visible oil or grease as is reasonably practicable - No significant
trace present, so far</li></ul><p> </p><p>The consent states that the sulphate levels
within the water are to be recorded and reported to the EA on a monthly basis. The
total daily discharge volume and the rate of discharge are to be recorded and reported
as and when requested by the EA.</p>
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