Debris has been bought to the surface at Clifton Beach following the construction of the Coastal Pathway.
Secretary Pat McIntosh said the association requested the city council restore the beach to its previous condition in September before rocks spread and the task becomes too hard.
However, she was told contractors Fulton Hogan had sieved sand to remove all rocks greater than 100mm from the construction area.
“Spending two minutes on the beach will reveal that either this is incorrect or the sieving has not been effective,” Dr McIntosh said.
She would like to see the contract between Fulton Hogan and the city council to understand the process behind the removal.
However, when Bay Harbour News requested to see the contract, city council transport planning and delivery manager Lynette Ellis said it would not be supplied as it contains commercially sensitive information.
Fulton Hogan declined to comment.
Ms Ellis said the smaller rocks found along the beach can remain as they are natural within the coastal environment and its tidal cycles.
But Dr McIntosh said the fact the rocks were natural was “completely irrelevant.”
The Coastal Pathway, which will connect Ferrymead to Scarborough along the coastline, is set to be completed before the end of the month.
The project required city council contractors Fulton Hogan to remove sand as it was unsuitable to build on, which uncovered the rocks.
The debris extends for about 500m along the beach adjacent to the seawall and there is a section about 30m long near Shag Rock.
There are concerns that the small, gravel-like rocks will ruin the amenity of a sandy beach, as they would make it difficult for people to sit down or walk on it in bare feet.
Environment Canterbury’s Banks Peninsula zone delivery leader Gillian Jenkins said the beach is expected to return to its previous state as there is no ongoing source of rock.
“The time frame for this to happen in is uncertain as it will be dependent on weather and sea conditions.”
But Dr McIntosh said she is not convinced the beach will return to its natural state within a reasonable time frame.
The association plans to take the issue to the newly-elected Linwood-Central-Heathcote Community Board.
“I sense they will certainly have a strong view on this,” Dr McIntosh said.
