Opus International Consultants (NSW) Pty Ltd - Transport for NSW ...

Preliminary Site Investigation at63 North Pde, Mt Druitt NSW A. D. Envirotech Australia Pty Ltd7 INVESTIGATION PROCEDURES7.1 Sampling Plan and Sampling MethodologySampling LocationsSix boreholes were drilled on site on the 30 th of September 2010. Refer to Figure 3 for boreholelocations.Soil Investigation PatternThe site investigation was designed based on a grid pattern, excluding the asbestos samples whichwere collected on a judgemental pattern. Background data and a site inspection identified anyactivities that may have generated contamination.Equipment DecontaminationADE‟s standard decontamination procedures were undertaken before drilling each of the boreholes toavoid the possibility of cross-contamination.The soil sampling equipment and items likely to come into contact with soil samples were thoroughlywashed, followed by rinsing with phosphate-free detergent and deionised water before the collectionof samples. Due care was taken with the disposal of any washings and residues from such cleaningoperations. One rinsate sample was collected during the investigation.DocumentationA field observation log was kept by sampling personnel. Details recorded in the log included:Borehole and sample number;Soil profile notes;Sampling method;Sample identification;Sample description; andSample point measurements.A comprehensive master sample register was maintained. As samples were received, they were givena unique sequential number from the sample register into which details from the labels were entered.Before packing and dispatch of samples for analysis, a Chain of Custody form was completed. Thisform recorded details of the individual samples being dispatched and the type of analysis required foreach sample.A total of fifteen samples (including blind replicate, rinsate, VOC spike and trip blank) weresubmitted to EnviroLab for testing. The split sample was sent to MGT for testing. A total of fivesamples were submitted to Environmental and OH&S Laboratory (a subsidiary of ADE) for asbestos4224 63 North Pde Mt Druitt PSI.v1 final Page 30