The River Humber Gas Pipeline Replacement Order 2016

Site Water Management Plan

5.—(1) No stage of the authorised project may commence until, for that stage, a site water management plan substantially in accordance with the initial site water management plan has been submitted to and approved by the relevant planning authority, in consultation with the Environment Agency.

(2) The site water management plan must include the following—

(a) an updated hydrogeological impact assessment of the detailed design approved under Requirement 4;

(b) details of further pump tests to confirm ground conditions (including anisotropy) at the drive pit (as indicated on works plan sheet 5);

(c) details of the recharge/reinjection measures to ensure that net abstraction is minimised and groundwater is discharged to a location agreed with the Environment Agency;

(d) details of any discharge to the Humber Estuary to a location agreed with the Environment Agency;

(e) details of the groundwater implications of decommissioning the drive and reception pits and proposals for any necessary ongoing groundwater management;

(f) a pre-, during and post-construction groundwater monitoring strategy to include the following—

(i) details of monitoring of groundwater levels adjacent to the proposed at the drive pit (as indicated on works plan sheet 5) and reception shaft (as indicated on works plan sheet 7);

(ii) net groundwater abstraction rates;

(iii) flow gauging in relevant surface water features;

(iv) baseline water chemical analysis; and

(v) a monthly review of monitoring data for the first six months post-construction followed by quarterly reviews until the Environment Agency has confirmed that it is satisfied that no further groundwater impacts will be identified (such confirmation not to be unreasonably withheld).

(g) details of measures to ensure discharge from dewatering is non-polluting and will not exacerbate flood risk;

(h) details of areas at risk of water pollution from surface water run-off, and any special control measures required in those areas;

(i) details of measures to minimise suspension of and pollution due to sediment;

(j) where it is considered necessary to store material in the flood plain, the requirements for mitigation will be agreed with the Environment Agency before construction commences;

(k) details of hydrostatic testing requirements, including water sources and discharge points, and water quality monitoring of test water discharged; and

(l) all necessary licences and consents will be obtained.

(3) The construction works for each stage of the authorised project must be carried out in accordance with the approved site water management plan.

(4) The method of crossing main rivers and ordinary watercourses (including land drains) shall be undertaken in a manner which will not cause an increase in flood risk to any area upstream, downstream or surrounding the crossing.