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Preliminary Site Investigation at63 North Pde, Mt Druitt NSW A. D. Envirotech Australia Pty LtdThe sample was prepared by EnviroLab and delivered to ADE prior to the field work. Thesamples were stored, handled, and transported in exactly the same way as the field samples. Thepercent recoveries for are given in the table below.Table 14 Analysis results of spiked VOC sample 4224-VOCSpike1 analysed by EnviroLab, µg/LAnalyteAcceptablerange, %SpikedConcentration,µg/LRecoveredConcentration,µg/LRecoveredConcentration,%ValidationresultBenzene 60 - 140 100 97 97 VToluene 60 - 140 100 98 98 VEthyl Benzene 60 - 140 100 99 99 VXylenes 60 - 140 100 100 100 VV – valid result, N – not valid resultThe results for 4 analytes were reported. All results showed valid values.11.2 QA/QC Data EvaluationThe qualitative and quantitative descriptors, so called Data Quality Indicators (DQIs), were usedin interpreting the degree of acceptability of the data acquired in the course of the investigation.The principal DQIs are precision, accuracy, representativeness, comparability, and completenessreferred to by the acronym PARCC. Precision and accuracy are the quantitative measures,representativeness and comparability are qualitative, and completeness is a combination of bothquantitative and qualitative measures.PrecisionPrecision is a measure of agreement among replicate measurements of the same property, madeunder prescribed similar conditions. A review of laboratory and field duplicate measurementsshowed acceptable levels of precision.AccuracyAccuracy is a measure of the closeness of an individual measurement to the true value. Accuracyis determined by analysing a reference material of known pollutant concentration or byreanalysing a sample to which a material of known concentration or amount of pollutant has beenadded.Accuracy was also evaluated by reviewing the values of percentage recoveries reported in spikesamples.4224 63 North Pde Mt Druitt PSI.v1 final Page 47
Preliminary Site Investigation at63 North Pde, Mt Druitt NSW A. D. Envirotech Australia Pty LtdRepresentativenessRepresentativeness is a measure of the degree to which data accurately and precisely represent acharacteristic of a population parameter at a sampling point or for a process condition orenvironmental condition.It was verified that each point in space had an equal probability of being selected for sampling.The site investigation revealed that soil samples collected were representative of the stratigraphicformations from which they were collected. It appears that measurements of the population ofinterest were made in such a manner that the resulting data appropriately reflect the environmentinvestigated.ComparabilityComparability is the qualitative term that expresses the ability to fairly compare sample testresults taken from the same site at different times.ADE‟s field personnel assigned for the project had considerable experience in the environmentalinvestigations of contaminated sites. Training records of the personnel are kept in the QualityAssurance Manual ADE-QAM-III. Sampling and measurements in the field were performed bythe same personnel during the field stage of the investigation.Standard ADE‟s environmental investigation procedures were used by the personnel in the field.No deviations from the sampling procedures were observed by the site supervisor during thefieldwork. Therefore, none or negligent bias in the data collection was expected.The spatial and temporal changes on the site during this period did not have significant influencein order to bias the data due to the environmental dynamics.Units in which the data was measured in the field and the laboratory analysis had the samemetrics.CompletenessDocumentation CompletenessIn the author‟s opinion, the documentation used in the course of the investigation, including:Field observation logs,Chain of Custodies,Orders,Laboratory accreditation, andLaboratory reports.was completed to satisfactory standards.4224 63 North Pde Mt Druitt PSI.v1 final Page 48
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MOUNT DRUITT COMMUTER CARPARKREVIEW
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Commuter Car Park and Interchange P
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Transit services provided at Mount
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MOVEMENT SUMMARYMt DruittSouthern C
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MOVEMENT SUMMARYMt DruittNorth Para
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MOVEMENT SUMMARYMt DruittNorth Para
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MOVEMENT SUMMARYMt DruittJirrang Cl
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MOVEMENT SUMMARYMt DruittMount St /
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MOVEMENT SUMMARYMt DruittSherbrooke
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MOVEMENT SUMMARYMt DruittSherbrooke
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Commuter Car Park Mt DruittVisual I
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