Onshore Pipeline Environmental Risk Assessment The site was positioned adjacent to a large reservoir in Singapore and any uncontrolled release from the pipeline network into this surface water receptor, would have represented a ‘national incident’. The study was completed using a logical, staged approach which included the following activities: Stage 1 – Initial site visit, meetings and collection of data. Stage 2 – Construction of a Site Conceptual Model (CSM) to identify potential release points (sources), ways in which contamination could migrate away from such areas (pathways) and the exact position of the reservoir (receptors). Stage 3 – Design of a site investigation to determine the type of lithology and permeability within strata below ground, so that the rate of contaminant transp

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