A thorough clean-up of the former Tay Street artificial surf reef is promised after a second sheet of geotextile material washed up this week.

It's the second such sheet to come ashore from the failed surf reef, after a snorkeler found a geotextile rug on a nearby reef on Moutuotau Island in May 2015.

Bits of the former reef are washing ashore. Photo: Chris Toner.

The artificial surf reef made out of stacked up, sand filled geotextile bags was removed in September 2014.

Contractor Underwater Solutions was required to pull only part of the reef out for its $87,000 tender.

Underwater Solutions cut open the large bags on the seabed, removed the top halves onto a barge and left the remaining structure to release the sand inside.

This phase was completed in December 2014. The bottom halves of the bags were left behind.

The BOP Regional Council's pollution prevention team leader Stephen Mellor says the council is now obtaining quotes to remove the remaining part of the reef.

'When conditions allow us to safely investigate further we will assess the current state of the reef.”

The material that washed ashore this week has been rolled up and left above the high tide line. It does not pose any danger, says Stephen, and will be removed to landfill as soon as possible.

'After some of the reef washed up last year we assessed the condition of the remaining material.

'This survey shows that the remains of the reef were anchored to the seabed. The seabed remains a dynamic and harsh environment which over time may have an effect on the material left there.

'Large pieces of loose material, such as the geotextile material floating around in the sea, does have the potential to be a hazard to water users including surfers.”

There are no plans at this stage to close the beach.

The Mount Maunganui Reef Trust obtained resource consent in August 2000 to construct the offshore submerged reef about 250 metres offshore from the Tay Street/Marine Parade corner.

The $1.5 million reef, built from 2005 to 2008 through donations from the public and community funding groups, never delivered the designers promise of a world class surf break.

Earlier reports place part of the blame for the reef failing to deliver the expected waves on the lengthy construction period.