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Page 1 of 67 MIDSTREAM AND DOWNSTREAM PETROLEUM SAFETY AND ENVIRONMENTAL REGULATIONS, 2025

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Management 
performance 
PART VII — ENVIRONMENTAL STUDIES AND ASSESSMENT 
 
54. A licensee or permit holder shall conduct an environmental study to evaluate the impact of 
activities or operations — 
(a) prior to the implementation of a new project;  
(b) while operating an existing facility;  
(c) after the occurrence of an incident such as a spill; and  
(d) for special activities in midstream and downstream petroleum operations as 
directed by the Authority. 
 
Environmental study 
 
55. (1) A person, licensee or permit holder shall in the manner prescribed by the Authority, conduct 
— 
(a) Project Concept Screening (PCS)  
(b) Preliminary Environmental Risk Assessment (PERA)  
(c)Mandatory Environmental Site Assessment (MESA) 
(d) Environmental Evaluation Study (EES) 
(e) A Post Impact Assessment (PIA) study  
(2) The Authority may, in response to new and emerging environmental challenges in the 
midstream and downstream petroleum industry, direct that a licensee or permit holder conduct 
a special study. 
 
Studies to be conducted 
by the licensee or permit 
holder 
 
56. An environmental study or assessment other than a Mandatory Environmental Site Assessment 
shall be conducted by an accredited person in the manner prescribed by the Authority.  
 
Studies or assessments 
to be prepared by 
accredited persons. 
57. 
(1) A licensee or permit holder shall obtain an approval from the Authority for these environmental 
studies or assessments where required for midstream and downstream petroleum projects or 
operations –  
(a) Mandatory Environmental Site Assessment (MESA) 
(b) Project Concept Screening (PCS)  
(c)Preliminary Environmental Risk Assessment (PERA);   
(d)EMP for projects which require Environmental Impact Assessment (EIA);  
Mandatory approvals for 
environmental studies or 
assessment