In Croatian Podravina relatively large quantities of natural gas was discovered. From various fields (Molve, Kalinovec, Stari Gradec) natural gas is pipelined to Gas Treatment Plant (GTP) Molve. Here, at GTP Molve III, technological procedures for purification of natural gas and its distribution are performed. With yearly natural gas production of 3,5 10 9 m 3 GTP Molve III is major Croatian energy resource. Its safety and environment impact is matter of concern. Continuous acoustic emission leak monitoring system for Gas Treatment Plant (GTP) Molve as an improvement in technological and environment safety is considered. Application of a leak monitoring system under industrial conditions is a problem setting specific demands. In the paper attention is paid to some aspects of acoustic emission system implementation and the acoustic background noise definition problem. Acoustic noise measurements at a GTP Molve III were performed and some results considering background noise are presented. In the paper acoustic noise measurements performed at a GTP Molve III were presented. Across the GTP Molve III acoustical background have different spectral and amplitude characteristic. In the input area, measurements presented at a first group of measuring points included the impact of sand moved by gas fluid. Sand hits should be distinguished from acoustic emission caused by growing cracks. Motors noise and turbulence around valves are probably the main source of background noise on second group of measuring points. The conclusion is that background noise across the plant is highly different. Patterns found in one part of plant could not be applied on others measuring points. Background noise and its characterization are one of main problems solved before reliable operation of acoustic monitoring system could be applied. It is found that at GTP Molve III acoustic background is complicated, consisting of different sources at different part of a plant.

3D Seismic survey of an area approximately 70km 2 was conducted in South-East Central Trinidad in the Naparima Mayaro Reserve from January to July 1999. This activity was done with the expectation of drilling exploratory wells for finding commercially viable oil reservoirs as a joint venture operation between Vintage Petroleum Trinidad Limited (formerly Cometra Energy (Canada) Limited) and Petrotrin. The companies initiated a number of proactive Environmental Management Programmes to comply with both local and international regulations. These programmes include: • Preliminary Environmental Impact Assessment Study for Seismic Survey of a 70km 2 area. • Environmental Baseline Survey for Seismic Survey inclusive of descriptions of physical, biological and socioeconomic environments, environmental audits, training and monitoring (noise and water quality). • Environmental Impact Assessment for drilling of exploratory well. • Development of Oil Spill Contingency Plan for drilling operations. The implementation of these studies resulted in a number of benefits to the joint venture oil companies, such as: • 100% compliance with Certificate of Environment Clearance Rules and International Association of Geophysical Contractors (IAGC) Guidelines. • Improved corporate image. • Enhanced relationship with Government Agencies. • Improved environmental performance through proper planning. • Trained and empowered workforce in environmental management issues. • Zero oil spills and environmental incidents to date.