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ExxonMobil Pipeline Company
SCAT Area Transition Report for A13
Silvertip Pipeline Incident
Laurel, Montana
October 18, 2011
SCAT Area Transition Report for A13 Silvertip Pipeline Incident Laurel, Montana
Prepared for:
ExxonMobil Pipeline Company
Prepared by:
ARCADIS G&M of North Carolina, Inc.
11000 Regency Parkway
West Tower, Suite 205
Cary, North Carolina 27518-8518
Tel 919.469.1952
Fax 919.469.5676
Our Ref.:
B0085883.1103
Date:
October 18, 2011
The observations described in this Report were
made exclusively under the conditions at the time
and subject to the limitations stated therein. It is
understood by Client that ARCADIS has relied on
the accuracy of documents, oral information, and
other material and information provided by sources
documented in this report, including but not limited
to information provided by Client and Client’s other
contractors. ARCADIS has not independently
verified any such information. The conclusions
presented in the Report are based solely upon the
observations and representations made by others.
i
Table of Contents
1. Executive Summary of Oil Removal Activities 1
1.1 Land Ownership and Access Issues 1
1.2 Cultural, Historic, and Natural Resource Constraints 1
1.3 Summary of Environmental Sampling 1
1.4 Summary of Initial SCAT Surveys 2
1.5 Applicable Compiled Treatment Recommendations 2
1.6 Oil Removal Activities 2
1.7 Pre-Inspection Survey Transmittal 3
1.8 Post-Inspection Survey Transmittal 3
1.9 Summary of Final SCAT Surveys 3
1.10 SCAT Area Conclusions 3
2. Transition Sign-Off Form 4
Tables
Table 1 Environmental Sampling Summary 2
Figures
Figure 1 Aerial Map with Parcel Boundaries
Figure 2 Wildlife Resources
Figure 3 Sample Location Map
Figure 4 Maximum SCAT Observations
Figure 5 Final SCAT Observations
Appendices
A Sample Detections Summary
B Initial SCAT Survey Forms and Sketches
C Pre-Inspection Survey Transmittal
D Post-Inspection Survey Transmittal
E Final SCAT Survey Forms and Sketches
F Completed SCAT Area Sign-Off Forms
1
SCAT Area Transition Report for A13
Silvertip Pipeline Incident Laurel, Montana
1. Executive Summary of Oil Removal Activities
This Shoreline Cleanup Assessment Technique (SCAT) Area Transition Report provides a summary of the SCAT surveys conducted to determine the extent of oiling
along the riverbanks and floodplain within SCAT Area A13, as well as the oil remediation activities completed in this area based on the SCAT Team recommendations. This report also summarizes the environmental samples collected
in SCAT Area A13. This report is intended to be read and used in conjunction with the Summary of Assessment and Oil Removal Activities report.
1.1 Land Ownership and Access Issues
Figure 1 provides an aerial map of SCAT Area A13, along with the (a) SCAT Area
boundary, (b) parcel boundaries and respective property owners, and (c) access constraints identified during the oil cleanup process. The acreage surveyed in Area A13 is 18.5. There were no access issues for the left bank, and a conditional access
agreement on the right bank.
1.2 Cultural, Historic, and Natural Resource Constraints
No historic properties or cultural resources have been identified within this segment that would affect oil removal activities.
Figure 2 summarizes the natural resources identified in this segment. International Bird Rescue and Resource Advisors from U.S. Fish and Wildlife Service conducted
regular inspections of area A13. No oiled wildlife was observed or recovered. No Wildlife Priority Cleanup Areas were identified. No active migratory bird nests were identified in Area A13.
1.3 Summary of Environmental Sampling
Table 1 (below) summarizes samples collected within Area A13. The analytical results for the samples collected can be accessed through a publicly accessible database on the United States Environmental Protection Agency’s (USEPA’s) website. The
approximate locations of samples collected within Area A13 are provided on Figure 3.
2
SCAT Area Transition Report for A13
Silvertip Pipeline Incident Laurel, Montana
Table 1 Environmental Sampling Summary
Appendix A contains a summary of sample results with detections for this sample set.
Detections with a result above the screening level are highlighted; for this set, two exceedances are shown for total extractable hydrocarbons.
1.4 Summary of Initial SCAT Surveys
The SCAT teams used systematic evaluation criteria and treatment method tables
approved by the National Oceanic and Atmospheric Administration to provide a standard approach for data collection and conducting field surveys. The forms and sketches from the initial SCAT surveys performed along the river bank (water edge)
and floodplain within Area A13 are included in Appendix B. Figure 4 provides the maximum oiling zones observed by the SCAT team during the initial surveys of Area A13.
1.5 Applicable Compiled Treatment Recommendations
The SCAT team developed compiled treatment recommendations (CTRs) providing approved treatment methods (ATMs) for each oiling zone identified during the initial SCAT surveys (CTR No. 1 and CTR No. 4).
1.6 Oil Removal Activities
Oil removal activities were conducted within Area A13 in accordance with the ATMs identified in the CTRs. Appendix I of the Summary of Assessment and Oil Removal Activities report presents this data including: date range/days worked, average number
of people working per day, equipment used, and various types of bags removed: oily
3
SCAT Area Transition Report for A13
Silvertip Pipeline Incident Laurel, Montana
debris, personal protective equipment (PPE), plastic, trash, super sacks, wood chips,
and contaminated wood.
1.7 Pre-Inspection Survey Transmittal
SCAT Operations liaisons performed an inspection of the remediated areas of SCAT Area A13 and developed a Pre-Inspection Survey Transmittal (PIST) associated with
the left bank within Area A13, which is presented in Appendix C.
1.8 Post-Inspection Survey Transmittal
A Post-Inspection Survey Transmittal (POST) was not conducted for this segment.
1.9 Summary of Final SCAT Surveys
Figure 5 shows the oiling conditions within Area A13 following completion of oil
removal activities. The SCAT team performed final surveys of the right and left banks within SCAT Area A13 to confirm the agreed-upon cleanup endpoints identified in the applicable CTRs had been achieved. The final SCAT survey documentation is
presented in Appendix E.
1.10 SCAT Area Conclusions
Based on the final SCAT surveys performed on the right and left banks within Area A13, no further treatment is recommended for this area. A SCAT Segment Sign-Off
Sheet is included as Appendix F.
4
SCAT Area Transition Report for A13
Silvertip Pipeline Incident Laurel, Montana
2. Transition Sign-Off Form
SCAT Area Transition Report for A13
Prepared for:
Unified Command
___________________
Date
Unified Command – RP
Silvert ip Pipeline IncidentArea Transition Report Map - Parcels±
Date: 9/28/2011 Time: 8:24:18 AM Path: P:\GIS\MXD's\Area_Transit ion_Figures\A1-Fig1-Parcels.mxd
Division A
AA 0088 --RR BB
AA 1111-- RR BB
AA 1122 --RR BB
AA 11 33 -- RR BB
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Figure 1
Silvertip Pipeline IncidentSCAT Area Transit ion Report Map±
Date: 9/22/2011 Time: 10:05:43 AM
Path: P:\GIS\MXD's\Wildlife\ATR Maps - Figure 2\ATR Map_Div.A_Fig2_09222011.mxd
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Figure 2Wildlife Resources
Note: Multiple individuals of the same species and status at a singlelocation are denoted by a number label adjacent to the wildlife symbol.
LEGEND
Amphibian Deceased (Collected)
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Bird Deceased (Collected)
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LegendSilvertip SCAT Segments
Figure 3Silvertip Pipeline IncidentEnvironmental Sampling
Locations as of 8/27/2011
A11-RB
A12-RB
A14-RB
A12-LB
A14-LB
A16-RB
A15-RB
A13-RB
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73
144
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172
173
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1812
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q 250 0 250 500Feet
Aerial Photography Dated July 20, 2011
9999Heavy OilingModerate Oiling
Light OilingVery Light OilingNo Oil Observed
Oiling Zone ID Figure 4 - Maximum SCAT ObservationsFor SCAT Area: A13
Printed: 9/24/2011 9:56:29 AMS:\GIS\SCAT Mapping\Maps\Area Transition Reports MXD\ATR Fig 4 - Max_SCAT_Observations_DataPages.mxd
POLARISAPPLIEDSCIENCES, INC.
A11-RB
A12-RB
A14-RB
A12-LB
A14-LB
A16-RB
A15-RB
A13-RB
A13-LB
73
144
74167
172
173
764
1918
1812
763
q 250 0 250 500Feet
Aerial Photography Dated July 20, 2011
9999Heavy OilingModerate Oiling
Light OilingVery Light OilingNo Oil Observed
Oiling Zone ID Figure 5 - Final SCAT ObservationsFor SCAT Area: A13
Printed: 9/24/2011 10:00:51 AMS:\GIS\SCAT Mapping\Maps\Area Transition Reports MXD\ATR Fig 5 - Final_SCAT_Observations_DataPages.mxd
POLARISAPPLIEDSCIENCES, INC.
Appendix A
Sample Detections Summary
Detections in Samples Collected in
SCAT Area A13
Printed 9/7/2011
Sample NumSample
TypeMatrix Analytical Method Analyte Detected Result
Screening
Level
Result
QualifierUnits Above?
B11072247-001 Field Soil_Surface MA-VPH-MDEQ-REM VPH Aliphatics Surrogate Y 91 NA % no
B11072247-001 Field Soil_Surface MA-VPH-MDEQ-REM VPH Aromatics Surrogate Y 81 NA % no
B11072247-001 Field Soil_Surface NONE-MDEQ-REM Moisture content Y 22 NA % by wt no
SPSO205D01_071211 Field Soil_Surface MADEP EPH Total Extractable Hydrocarbons Y 21900 200 mg/kg YES
SPSO205D01_071211 Field Soil_Surface MADEP VPH Toluene Y 0.14 10 mg/kg no
SPSO206D01_071211 Field Soil_Surface MADEP EPH Total Extractable Hydrocarbons Y 32600 200 mg/kg YES
SPSO207D01_071211 Field Soil_Surface MADEP EPH Total Extractable Hydrocarbons Y 134 200 mg/kg no
NA - Not Available
Detected Above Screening Level
Page 1 of 1
Appendix B
Initial SCAT Survey Forms and
Sketches
Appendix C
Pre-Inspection Survey Transmittal
Appendix D
Post-Inspection Survey Transmittal
A Post-Inspection Survey was not conducted for this area
Appendix E
Final SCAT Survey Forms and
Sketches
Appendix F
Completed SCAT Area Sign-Off
Forms
