UU 23/1997, Pasal 1, Ayat 23 (see web ref 1 below: Audit lingkungan hidup adalah suatu proses evaluasi yang dilakukan
oleh penanggung jawab usaha dan/atau kegiatan untuk menilai tingkat ketaatan terhadap persyaratan hukum yang berlaku dan/atau kebijaksanaan dan standar yang ditetapkan oleh penanggung jawab usaha dan/atau kegiatan yang bersangkutan;
English translation (see web ref 2 below): An environmental audit is an evaluation process performed by those responsible for a business and/or activity to assess the level of compliance with applicable legal conditions and/or policy and standard set by the party responsible for the business and/or activity concerned;

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Note added at 51 mins (2011-07-03 05:45:37 GMT)
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See also http://www.unescap.org/drpad/vc/orientation/legal/legal_1_in...
"Conduct of environmental audit under the Indonesian Law Concerning Environmental Management
Encouragement for business to conduct environmental audit
- Article 28 of the Indonesian Law Concerning Environmental Management states that in the scheme of improving business and/or activity performance, the Government encourages the party responsible for a business and/or activity to conduct an environmental audit.
Environmental audit as an instrument for activity efficiency
1. An environmental audit is an important instrument for the party responsible for a business and/or activity to increase their activity efficiency and performance in complying with environmental conditions which have been stipulated by laws and regulations. In this sense, an environmental audit is conducted voluntarily to verify compliance with applicable environmental laws and regulations, and with policy and standards which have been applied internally by party responsible for the business and/or activity concerned."

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Note added at 2 hrs (2011-07-03 07:08:01 GMT)
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Note: In a plural context, 'the party responsible for (the business and/or) activity' would become 'those responsible for (the business and/or) activity'.

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Note added at 9 hrs (2011-07-03 14:36:12 GMT)
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By the way, 'limbah B3' is 'limbah bahan beracun dan berbahaya', regulated by Peraturan Pemerintah No. 85 Tahun 1999
Tentang : Perubahan Atas Peraturan Pemerintah No. 18
Tahun 1999 Tentang Pengelolaan Limbah Bahan Berbahaya
Dan Beracun