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

More documents

Recommendations

Info

Preliminary Site Investigation at63 North Pde, Mt Druitt NSW A. D. Envirotech Australia Pty LtdXylene from 0.1 to 30 mg/kgBenzo(a)pyrene from 0.1 to 100 mg/kgTotal PAH from 1 to 480 mg/kgTherefore, their mean concentrations were expected to be within the range of the aboveconcentrations.2) Identify the decision errors and choose the null hypothesis -(a) Define both types of decision errors and establish the true state of nature for each decision error -The planning team determined that the two decision errors were:i) deciding that soil on site is contaminated when it truly is not, andii) deciding that soil on site is not contaminated when it truly is.The true state of nature for decision error (i) is that soil is not contaminated.The true state of nature for decision error (ii) is that soil is contaminated.b) Specify and evaluate the potential consequences of each decision error -The consequences of deciding that soil is contaminated when it truly is not would be that theclient would have to ultimately pay for the disposal of soil at a NSW DECCW approvedlandfill. The consequences of deciding that soil is not contaminated when it truly is would bethat contamination would remain on the site and could possibly endanger human health andthe environment. In this situation, the client might be liable for future damages andenvironmental cleanup costs. Additionally, the reputation of the client might be compromised,jeopardising its future profitability.c) Establish which decision error has more severe consequences near the action level –The planning team concluded that decision error (ii) has the more severe consequences nearthe action level since the risk of jeopardising human health outweighs the consequences ofhaving to pay for disposal.d) Define the null hypothesis and the alternative hypothesis and assign the terms "false positive" and"false negative" to the appropriate decision error –The baseline condition or null hypothesis (H o ) is "soil is contaminated". The alternativehypothesis (H a ) is "soil is not contaminated". The false positive decision error occurs whenthe null hypothesis is rejected when it is true. The false negative decision error occurs whenthe null hypothesis is not rejected when it is false.3) Specify a range of possible values of the parameters of interest where the consequences of decisionerrors are relatively minor (grey region) –The grey region is the area adjacent to the action level where the planning team felt that theconsequences of a false negative decision error were minimal. In order to decide how to setthe width of the grey region, the DEFT software Version 4.0 provided by the US EPA withData Quality Objectives Decision Error Feasibility Trials (DQO/DEFT) was utilised. Theplanning team considered where the consequences of a false negative decision error wereminimal. Clearly any false negative decision error (to the left of the action level) would causethe client to bear the cost of unnecessary expense (i.e., sending non-contaminated soil to anDECCW approved landfill). The planning team, however, also realised that they ought todefine a reasonable grey region that balances the cost of sampling with risk to human healthand the environment. The „width‟ of the grey region for each contaminant of concern wasentered, taking into account the value offered by the DEFT software.4) Assign to points above and below the action level that reflect the tolerable probability for theoccurrence of decision errors –The US RCRA regulations allow a 5% decision error rate at the action level. The planningteam set the decision error rate to 5% as the consequences of health effects from thecontaminated soil left on the site. On the other side of the action level, the planning team set4224 63 North Pde Mt Druitt PSI.v1 final Page 28
Preliminary Site Investigation at63 North Pde, Mt Druitt NSW A. D. Envirotech Australia Pty Ltdthe tolerable probability of making a false negative error at 20% when the true parameterwould be to the left of the grey region. Based on both experience and an economic analysisthat show that these decision error rates were reasonable to balance the cost of samplingversus the consequence of sending clean soil to a landfill.6.7 Data Collection DesignSelection of the data collection and analysis design for generating data that are expected tosatisfy the DQOs.The minimum sample size settled upon with the client was approximately 5 samples as the report isonly a preliminary investigation. Taking this, calculations by the DEFT software and the sitecondition into account, the sample sizes for the contaminants of concern will remain at 5. Refer to thetable below for the sampling and analytical program for site investigation.4224 63 North Pde Mt Druitt PSI.v1 final Page 29
Page 3:
MOUNT DRUITT COMMUTER CARPARKREVIEW
Page 6 and 7:
Mount Druitt Commuter Car ParkRevie
Page 8 and 9:
Page 10 and 11:
Page 12 and 13:
Page 14 and 15:
Page 16 and 17:
Page 18 and 19:
Page 20 and 21:
Page 22 and 23:
Page 24 and 25:
Page 27 and 28:
Page 29 and 30:
Page 31 and 32:
Page 33 and 34:
Page 35 and 36:
Page 37 and 38:
Page 39 and 40:
Page 41 and 42:
Page 43 and 44:
Page 45 and 46:
Page 47 and 48:
Page 49 and 50:
Page 51 and 52:
Page 53 and 54:
Page 55 and 56:
Page 57 and 58:
Page 59 and 60:
Page 61 and 62:
Page 63 and 64:
Page 65 and 66:
Page 67 and 68:
Page 69 and 70:
Page 71 and 72:
Page 73 and 74:
Page 75 and 76:
Page 77 and 78:
Page 79 and 80:
Page 81 and 82:
Page 83 and 84:
Page 85 and 86:
Page 87 and 88:
Page 89 and 90:
Page 91 and 92:
Page 93 and 94:
Page 95 and 96:
Page 97 and 98:
Page 99 and 100:
Page 101 and 102:
Page 103 and 104:
Page 105 and 106:
Page 107 and 108:
Page 109 and 110:
Page 111 and 112:
Page 113:
Commuter Car Park and Interchange P
Page 116 and 117:
Mount Druitt Commuter Car ParkTraff
Page 118 and 119:
Page 120 and 121:
Page 122 and 123:
Page 124 and 125:
Page 126 and 127:
Transit services provided at Mount
Page 128 and 129:
Page 130 and 131:
Page 132 and 133:
Page 134 and 135:
Page 136 and 137:
Page 138 and 139:
Page 140 and 141:
Page 142 and 143:
Page 144 and 145:
Page 146 and 147:
Page 148 and 149:
Page 150 and 151:
Page 152 and 153:
Page 154 and 155:
Page 156 and 157:
Attachment 1: Origin Destination Su
Page 158:
Page 161:
MOVEMENT SUMMARYMt DruittSouthern C
Page 164 and 165:
MOVEMENT SUMMARYMt DruittNorth Para
Page 166:
MOVEMENT SUMMARYMt DruittNorth Para
Page 169 and 170:
MOVEMENT SUMMARYMt DruittJirrang Cl
Page 171:
MOVEMENT SUMMARYMt DruittJirrang Cl
Page 174 and 175:
MOVEMENT SUMMARYMt DruittMount St /
Page 176:
MOVEMENT SUMMARYMt DruittMount St /
Page 179 and 180:
MOVEMENT SUMMARYMt DruittSherbrooke
Page 181:
MOVEMENT SUMMARYMt DruittSherbrooke
Page 184 and 185:
KMH-2010123a REF Rev 4 docStatus: F
Page 186 and 187:
Commuter Car Park Mt DruittVisual I
Page 188 and 189:
Page 190 and 191:
Page 192 and 193:
Page 194 and 195:
Page 196 and 197:
Page 198 and 199:
Page 200 and 201:
Page 202 and 203:
Page 204 and 205:
Page 206 and 207:
Page 208 and 209:
Page 210 and 211:
Page 212 and 213:
Page 214 and 215:
Page 216 and 217:
Page 218 and 219:
Page 220 and 221:
Page 222 and 223:
Page 224 and 225:
Page 226 and 227:
Page 228 and 229:
KMH-2010123a REF Rev 4 docStatus: F
Page 230 and 231: Commuter Car Park and Interchange P
Page 250 and 251: Appendix AReport Number610.08297Pag
Page 252 and 253: KMH-2010123a REF Rev 4 docStatus: F
Page 254 and 255: Preliminary Site Investigation at63
Page 308: Preliminary Site Investigation at63
show all

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

Create successful ePaper yourself

Delete template?

Save as template?