The survey, conducted by the local community health council, placed Northwick Park top of a "league table" of long-wait hospitals.
The complaints were included in a quarterly report from the local community health council in the Abertawe Bro Morgannwg (ABM) area.
However, the local community health council - the patients' watchdog - has decided not to use its powers to refer the decision to Welsh government ministers.
Despite the controversy they caused, the local community health council - the patients' watchdog - decided not to use its powers to refer the decision to Welsh government ministers.
However, patient watchdog the local Community Health Council (CHC) has yet to make a decision on the plans and it can forward them to Ms Griffiths' office if they have any concerns.
The local community health council CHC has warned in its consultation response that there was "a clear mistrust" of the health board by the public and deep misgivings about the willingness of managers to take account of consultation responses.
The group - Ann Jones AM (Labour), Darren Millar AM (Conservative), Llyr Huws Gruffydd AM (Plaid Cymru), and Aled Roberts AM (Liberal Democrat) - have also written to the local Community Health Council (CHC) urging the watchdog to formally object to the health board's findings.
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The plans could be referred to ministers by the local patient watchdog, the community health council, which has still to make a decision.
CSPs are made up of representatives from the police and police authority, the local council, and the fire, health and probation services.
He also criticised SWWA for keeping the local council's deputising environmental officer for health "in the dark" about sample aluminium levels until 28 July.
Mark Goldring, chief executive at the charity Mencap, would be helping officials at the Department of Health investigate the findings of inquiries by the Care Quality Commission (CQC), England's regulator of health and social care services, and the local council, Mr Burstow added.
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The local authority said police, the Health and Safety Executive and the council's own health and safety staff were involved in reviewing all aspects of the incident.
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