Glyn Rhonwy Pumped Storage

The views expressed in this page do not represent those of the Planning Inspectorate. This page consists of content submitted to the Planning Inspectorate by the public and other interested parties, giving their views of this proposal.

Glyn Rhonwy Pumped Storage

Received 14 January 2016
From Concerned About Glyn Rhonwy (CAGR) (Concerned About Glyn Rhonwy (CAGR))


MUNITIONS: Previously classified information has just been released in the Developer’s documentation about known and unknown ordnance remaining on site. A level of uncertainty about the possible presence of unexploded ordnance including chemical weapons has arisen which the Developers’ documentation fails to address. This needs clarification in regard to risk to public health, safety and the environment.

WATER MONITORING: Large volumes of water will be discharged from the quarries during construction and operation, and could carry harmful chemicals mobilised into the water column from reworking of material on site. This could have a profound effect on downstream water catchment areas. Proposals for continuous monitoring and control of this discharge are inadequate. They critically depend on the Developers’ own ability to self-regulate, and on other external regulatory bodies. These mechanisms have recently appeared to fail during the preliminary ground investigations.

FLOOD RISK: Risks due to flooding are not considered adequately with regard to residents directly in the flowpath. They do not adequately address the possibility of sudden loss of containment for example due to large scale collapse of a quarry wall into upper or lower ponds. There is high possibility of unexpected flowpaths connecting the whole quarry system deriving from earlier documented and undocumented quarry workings. Geological reports are overoptimistic about ability to manage this. Residents below Q6 on the A4086 need legally binding assurance that the local water table will not be raised by seepage from the quarries, thereby affecting their properties. Residents downstream of the Dinorwig scheme are already subject to rapid river level changes from unannounced releases of water into the system. These risks are not adequately addressed for the Glyn Rhonwy scheme.

NOISE: During construction: Blasting rather than tunnelling may be necessary. A continuous conveyor may be used to move excess material uphill. The impact of this noise has not been adequately addressed. During operation: The potential impact of long term exposure to low frequency noise has not been adequately addressed We understand the Developers are seeking a “Power” to be immune from noise nuisance claims relating to the correct construction and operation of the project. We believe the Developers’ noise assessments are inadequate in this regard. Noise is an issue for residents close to the Dinorwig scheme across the valley, resulting in successful claims for compensation.

GRID CONNECTION: The Developer gives assurances that the connection to the national grid will be underground, but there is no legal obligation. Financial and technical considerations could result in pylons being used. There should be a legal obligation to make the connection underground

CONSTRUCTION ISSUES: The upper site will be accessed from Waunfawr along a narrow road. Local residents are concerned about disturbance and risk to their properties but believe their views were not adequately addressed by a flawed consultation process.

ACCESS: Some recreational users of the area around the site have indicated that the “land swap” being offered as part of this scheme is not a satisfactory arrangement.