The order required the defendants to ensure all remaining tyres stored at a yard in Kawerau were removed and lawfully disposed of by April 30, 2018.
The Merries and Spencer are former directors of Ecoversion Logistics Limited which was incorporated in September 2014 under the name Kawerau Tyre Storage Ltd.
Between October 8, 2014 and May 1, 2015 at least 1200 tonnes of end-of-life tyres were moved to a site in Spencer Avenue leased from the Kawerau District Council.
Judge Kirkpatrick made it clear to the parties they were jointly liable for the removal of the tyres as well as actual and reasonable costs incurred by the regional council.
At the time he also fined the Merries $28,500 each and Spencer was fined $21,000 for contravening two abatement notices issued by the regional council in August 2015.
The Kawerau site is bordered on three sides by the Tarawera River, which is listed by the regional council as a habitat or migratory pathway for indigenous fish species.
The regional council's summary of facts also stated heavy metals, primarily zinc, but also cadmium and lead and organic contaminants, can slowly leach out of the tyres.
There was the potential for adverse effects to groundwater, as well as soil contamination and significant discharges into the air if there was a fire, the council said.
The saga first began after Hamilton City Council awarded a $286,235 contract to Ecoversion Logistics in 2015 to take 150,000 tyres from a failed Frankton Tyre Yard.
The company entered into an agreement to lease part of a quarry in Waihi Beach for three months and in May 2015 moved about 900 tonnes of tyres from Hamilton on to the site.
The remainder of the Hamilton tyres were sent to a Taupō address for "farm use".
Despite two abatement notices, about 900 tonnes of tyres remained at the Waihi site and about 1200 tonnes at the Kawerau site in March 2016.
Ecoversion Logistics charges were withdrawn after the company was placed into liquidation in June 2016.
All the tyres from the Waihi site have since been removed and disposed of, and most of the tyres have been removed from the Kawerau site, the regional council said.
The defendants have pleaded guilty to the charges but no convictions have been entered against the Merries who are seeking a discharge without conviction.
Judge Prudence Steven has reserved her decision.