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

Preliminary Site Investigation at63 North Pde, Mt Druitt NSW A. D. Envirotech Australia Pty Ltdanalysis. All copies of the completed Chain of Custody forms were retained on the Central FilingSystem and the originals were sent to the analytical laboratories together with the samples.7.2 Sampling ProceduresThe contamination assessment of the subsurface at the site was achieved by an investigationconsisting of an exploratory soil drilling program and soil sampling.A soil drilling program was carried out to evaluate the levels of potential contamination to thesubsurface. Stratigraphical information was also obtained in order to assess the shallow geologicaland hydrogeological conditions at the site. Refer to Appendix II Borehole Logs.SoilsSoils were drilled applying solid flight augers. When the sampling depth was reached, undisturbedsoil (split spoon) samplers were used to evaluate the contamination conditions of samples.Field activities were supervised by an experienced environmental scientist who directed samplingoperations.The samples were placed in sterile glass jars with Teflon lined lids, submitted for PID testing and thenplaced into a pre-cooled Esky. The samples exhibiting the highest detected VOC concentration fromeach borehole were submitted for analysis. Additional samples for determination of the possiblevertical extent of impact were also obtained. The PID was calibrated in accordance with themanufacturer‟s specification.Each sample jar was well protected by packaging material. Ice packs were inserted in the Esky tomaintain the samples at approximately 4 0 C. The original Chain of Custody form was enclosed in theEsky that was then sealed and despatched to NATA accredited analytical laboratories.Twenty soil samples were tested for the analytes including petroleum hydrocarbons, benzene, toluene,ethyl-benzene, xylenes, metals, polyaromatic hydrocarbons, polychlorinated biphenyls,organochlorine pesticides, cyanide and phenols. Five samples were tested for asbestos.4224 63 North Pde Mt Druitt PSI.v1 final Page 31