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Control of Industrial Major Accident Hazards (CIMAH) Report Page 3
Ranhill SAJ Sdn Bhd Revision 01
Part A: Information on the Hazardous Substances Date Aug 2019

A.1.0 HAZARDOUS SUBSTANCE

The name of the hazardous substance as given in Schedule 2 or, for a
hazardous substance included under a general designation, the name of the
corresponding to the chemical formula of the hazardous substance

A.1.1 Hazardous Substance On-Site

The following chemical substances are being used for the water treatment process at
the Kampung Tengah 1 & Kampung Tengah 2 Water Treatment Plant:

• Chlorine
• Sodium Silicofluoride
• Polyaluminium Chloride

• Soda Ash

The hazardous substances on-site Kampung Tengah 1 & Kampung Tengah 2 (KT1
& KT2) Water Treatment Plant (WTP), under the CIMAH Regulations 1996, are (i)
Chlorine; a Toxic substance under Group 2 “Toxic Substances” (quantity > 1 tonne)
Part 1 of Schedule 2, and (ii) Sodium Silicofluoride, as an “Other Toxic Substances”
under Item 2 of Schedule 1.

The maximum quantity of Chlorine on-site was 3.3 tonnes at KT1 and 9.3 tonnes at
KT2, where the location of the storage is within 500 meters with each other. Total
quantity of chlorine (12.6 tonnes) for both KT1 & KT2 WTP has exceeded the
threshold quantity of 10 tonnes as specified in the CIMAH Regulations 1996. The
total quantity of Sodium Silicofluoride on-site has exceeded 10% of the 10 tonnes
threshold quantity as specified in the Item 2 of Schedule 1 CIMAH Regulations 1996.

KT1 & KT2 WTP is considered as a Major Hazard Installation (MHI) as the inventory
of the substance (chlorine) exceeds the threshold quantity as described in the

CIMAH Regulations 1996.

Other chemicals that are involved in the process of water treatment facilities include
Polyaluminium Chloride and Soda Ash. These chemicals are not classified as
hazardous substances as per Schedule 1 and Schedule 2 of the CIMAH Regulations
1996. The chemical substances present on-site are tabulated in Table A.1.1 below.

It should be noted that the hazards posed by hazardous substances that are below
the 10% threshold limit will result in lower risk, thus it was quantitatively assessed