ISO 14001 Environmental performance evaluation

I don’t know if I’m understanding your question. What I recommend doing is to:

• determine significant environmental aspects and determine which need to be part of a monitoring and measuring plan
• determine monitoring and measuring requirements based on compliance obligations

Based on 1 and 2 develop a monitoring and measuring plan. Some indicators are explicit requirements from compliance obligations with specifications and frequency defined. Some indicators are determined by the organization and can be absolute or relative. For example, water or energy consumption per unit amount of output.

Together with evaluation of environmental performance I recommend doing the evaluation of action plans progress.

Please consider the following information:

• Environmental performance evaluation - https://advisera.com/14001academy/blog/2015/07/06/environmental-performance-evaluation/
• How to perform communication related to the EMS - https://advisera.com/14001academy/blog/2015/08/31/how-to-perform-communication-related-to-the-ems/
• Enroll for free in this course – ISO 14001:2015 Foundations Course - https://advisera.com/training/iso-14001-internal-auditor-course/
• Book – The ISO 14001:2015 Companion - https://advisera.com/books/the-iso-14001-2015-companion/