A division bench asked the Bombay Natural History Society (BNHS) and the National Environmental Engineering Research Institute (NEERI) to carry out an evaluation whether the dumping ground expansion will adversely impact the sanctuary and submit a report after two weeks.
The bench comprised Acting Chief Justice B P Dharmadhikari and Justice N R Borkar.
The court was hearing a petition filed by NGO Vanshakti against the expansion plan of the dumping ground to 121 hectares from the present 65 hectares proposed by the Brihanmumbai Municipal Corporation (BMC).
As per the plea, the expansion was in violation of coastal regulation zone (CRZ) norms and would cause irreparable damage to the eco-sensitive zone of the Thane Creek Flamingo Sanctuary.
On December 5, 2019, another HC bench had lifted a September 19, 2019, stay on waste dumping at the site.
The order had pointed that there was a lack of space for dumping and treating solid waste in Mumbai as the dump yard at suburban Mulund was closed in 2018, and the overburdened dumping ground in Deonar was also proposed to be shut.
Vanshakti then approached the Supreme Court against the December 2019 ruling.
Last week, the apex court referred the matter back to the HC and directed it to reconsider the issue.