Overview of the revised NDEQ Petroleum Remediation Section Guidance Document
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Transcript of Overview of the revised NDEQ Petroleum Remediation Section Guidance Document
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NDEQ Petroleum Remediation Section 1/130
Risk-Based Corrective Action (RBCA) at Petroleum Release
Sites: Tier 1 / Tier 2 Assessments & Reports
Overview of the revised NDEQ Petroleum Remediation Section
Guidance Document
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NDEQ Petroleum Remediation Section 2/130
Scott McIntyre
NDEQ Petroleum Remediation Section
402-471-2668
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NDEQ Petroleum Remediation Section 3/130
Objectives
Highlight additions and changes to the guidance document
Discuss changes to the Tier 1 and Tier 2 Report Forms
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NDEQ Petroleum Remediation Section 4/130
Guidance Document Format
Background
Pre-Investigation
Tier 1 / Tier 2 Assessments
Risk-Based Evaluation
Supplemental Information
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Section 1 -- Background & Applicability 5/130
Section 1.0
Background & Applicability
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Section 1 -- Background & Applicability 6/130
1.0 – Background
Developed by the NDEQ Petroleum Remediation Section based on:
Title 118 – Ground Water Quality Standards and Use Classification
Title 126 – Rules and Regulations Pertaining to the Management of Wastes
ASTM E-1739 – Standard Guide for Risk-Based Corrective Action Applied at Petroleum Release Sites
Recommendations made by the Technical Advisory Committee created by the Nebraska Legislature
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Section 1 -- Background & Applicability 7/130
1.0 – Applicability
DOES apply to petroleum releases from:
Underground Storage Tanks
Aboveground Storage Tanks
Pipelines
Transportation vessels
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Section 1 -- Background & Applicability 8/130
1.0 – Applicability
NOT intended for petroleum wastes considered hazardous in accordance with:
Title 128 – Nebraska Hazardous Waste Regulations
40 CFR Part 302
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Section 1 -- Background & Applicability 9/130
1.1 – Workplans & Costs
Costs for LUST and LAST investigations may be eligible for reimbursement under Title 200 – Rules and Regulations for Petroleum Release Remedial Action Reimbursement Fund
To be eligible for reimbursement:
Workplan & cost estimate must be submitted
Department must approve the workplan and review costs before the related work begins
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Section 1 -- Background & Applicability 10/130
1.1 – Workplans & Costs
Some costs may not be eligible for reimbursement:
Work done without first receiving the Department’s approval
Costs associated with finishing incomplete work
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Section 1 -- Background & Applicability 11/130
1.1 – Workplans & Costs
The RBCA guidance document may be referenced in the workplan to serve as the description of investigation procedures
Changes from methods presented in the guidance document:
Must be highlighted and explained in the workplan
Must receive Department approval before work begins
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Section 1 -- Background & Applicability 12/130
1.1 – Workplans & Costs
Voluntary Remedial Action program
Release must be reported according to Title 126
Responsible Party can proceed with remedial actions if none have yet been required by the Department
Must follow the Department’s guidance documents and regulations
Considered for reimbursement when the Department requires and approves remedial action at the site
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Section 1 -- Background & Applicability 13/130
1.1 – Workplans & Costs
Remedial actions may also be regulated by other agencies:
Geologists Regulation Act
Engineers & Architects Regulation Act
Health & Human Services Contractors’ Licensing Program
Other Federal, State, and local laws
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Section 2 -- RBCA Process Overview 14/130
Section 2.0
NDEQ RBCA Process Overview
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Section 2 -- RBCA Process Overview 15/130
2.2 – General RBCA Process
Flowchart provided in Figure 2-1
Pre-Investigation Site Visit (wp)
Tier 1 Investigation and Report (wp)
Tier 1 Evaluation
Tier 2 Site Investigation (wp)
Tier 2 Evaluation
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Section 2 -- RBCA Process Overview 16/130
2.2 – General RBCA Process
6. Remedial Action Conceptual Plan
7. Remedial Action Plan (wp)
8. Implement Remedial Action Plan (wp)
9. Review of Remedial Action Effectiveness
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Section 2 -- RBCA Process Overview 17/130
2.2 – General RBCA Process
10.Public Notice and Comment Period
11.Monitoring Well Abandonment (wp)
12.Site Closure
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Section 2 -- RBCA Process Overview 18/130
2.2 – General RBCA Process
Unexpected Site Conditions (free product, vapors in structures, or surface water impact):
Contact NDEQ and other authorities as specified in Table 2-1 (correction to the March 2009 version)
The Department may modify the investigation requirements on a case-by-case basis
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Section 2 -- RBCA Process Overview 19/130
2.3 – Investigation Process
Goals:
Characterize the area around the release site
Create a Site Conceptual Exposure Scenario and consider risk to the potential exposure pathways:
• Contact and ingestion of surface soil• Inhalation of COCs from subsurface soil• Leaching of COCs from soil to ground water• Surface water and ecological impacts• Inhalation of COCs from ground water• Ingestion of COCs from ground water
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Section 2 -- RBCA Process Overview 20/130
2.4 – Tiered Process Characteristics
Tier 1:
Conservative, non-site-specific exposure factors, fate and transport models, and parameter values
Risk-Based Screening Levels (RBSLs) developed to apply to broad categories of sites
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Section 2 -- RBCA Process Overview 21/130
2.4 – Tiered Process Characteristics
Tier 2:
Uses the same exposure factors and models as Tier 1
Incorporates site-specific parameter values
Site-Specific Target Levels (SSTLs) generally higher than the Tier 1 RBSLs used for the same site
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Section 2 -- RBCA Process Overview 22/130
2.4 – Tiered Process Characteristics
Target risk and level of protection remains the same for both tiers
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Section 3 -- Pre-Investigation Assessment 23/130
Section 3.0
Pre-Investigation Assessment
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3.2.1 – Site Visit Goals
Locate source areas
Identify points of exposure
Water supply wells
Subsurface structures
Surface water bodies
Conduct a utility survey
Select potential drilling locations
Prepare a site map
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3.2.1 – Property Access
Contact NDEQ project manager for assistance with access problems
Railroad property:
State that remedial actions required by NDEQ
Possible fee waivers
Contact project manager if necessary
Payments for access are generally NOT eligible for reimbursement
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3.2.2 – Source Areas
Known points of leakage
Stained soils
Elevated sampling results
Consult project manager if necessary
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Section 3 -- Pre-Investigation Assessment 27/130
3.2.2 – Source Areas
Figure 3-1 provides examples of source area determinations for typical petroleum release scenarios
LUST
LAST
Transportation
Pipeline
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Section 4 -- General RBCA Investigation Requirements 28/130
Section 4.0
General RBCA
Site Investigation Requirements
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4.1 – Introduction
Information required for both Tier 1 and Tier 2 investigations
Contact the Department:
Free product
Sheen on surface water
Vapors in structures
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4.2 – Chemicals of Concern
Depends on:
Material released
Product storage history
Table 4-1 lists Chemicals of Concern for typical petroleum products
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4.2 – Chemicals of Concern
Gasoline and JP-4:
Benzene
Toluene
Ethylbenzene
Total Xylenes
N-Hexane
MTBE
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4.2 – Chemicals of Concern
Diesel fuel and waste oil:
Benzene
Toluene
Ethylbenzene
Total Xylenes
Total Extractable Hydrocarbons (TEH)
Polycyclic Aromatic Hydrocarbons (PAHs)
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4.2 – Chemicals of Concern
Target levels for some PAHs are very low
TEH Surrogate Method
TEH results used to estimate concentrations of PAHs based on constituent percentages
Applies to:
• Naphthalene• Pyrene• Benzo(a)pyrene
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4.3.1 – Maps
All structures and physical features depicted must be based on current information
Aerial photographs:
May be submitted
NOT a substitute for any of the required maps
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4.3.1 – Maps
Area map
Site map
Free product map
Contaminant maps
Not required for Tier 1
Required for each COC/Media for Tier 2 according to Table 4-2
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4.3.4 – GPS Locations
Provide location coordinates for:
Each source area
The site itself
Recommended but not required:
Individual well locations
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4.3.4 – GPS Locations
Accuracy:
Recreational-quality GPS sufficient for site and source-area locations
Sub-meter accuracy recommended for individual well locations
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4.4 – Land Use & Receptors
“Receptor” refers to humans potentially exposed to COCs
“Points of Exposure” (POE) refers to physical locations
Water supply wells
Basements or subsurface structures
“Ecological Exposure” refers to locations where COCs or free product may affect wildlife
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4.4.3 – Water Well Survey
Municipal wells within 2000’
Domestic, irrigation, industrial, and agricultural wells within 1000’
Sandpoint and hand-pumped wells within 500’
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4.4.3 – Water Well Survey
Unregistered wells:
Contact local water commissioner or utility superintendent
Visual survey of properties within 200’ of the source (correction to the March 2009 version)
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4.4.4 – Subsurface Structures
Buildings with basements or crawl spaces
Cellars
Storm and sanitary sewers
Utility conduits
Any other space that might allow accumulation of vapors
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4.4.4 – Subsurface Structures
Identify location and depth of all structures within 200’ of the source or extent of contamination
Consult local utility superintendent
Visual survey of properties
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4.4.5 – Ecological Exposures
Identify permanent surface water bodies within 1000’ of the source or extent of contamination
Visually inspect each for the presence of a sheen or other signs of contaminant impact
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4.5 – Monitoring Wells
All monitoring wells must be constructed in accordance with the Department of Health & Human Services (DHHS) Title 178 – Environmental Health
Variances:
Obtain NDEQ agreement
Contact NDHHS to request variance
Document in workplan and report
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4.5.1 – Monitoring Well Installation
General requirements:
Minimum 2” diameter
Screen length not to exceed 10’ without approval
Use commercially-slotted or continually-wrapped schedule 40 PVC screen
Anticipated static water level should intersect the midpoint of the screen
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4.5.1 – Monitoring Well Installation
Auger drilling
Hollow-stem (preferred)
Solid-stem
• Requires Department approval• Locations away from known source areas• Material will maintain integrity without support
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4.5.1 – Monitoring Well Installation
Direct-push technologies
NOT for permanent ground water monitoring well installations under Title 178
CANNOT be used for Tier 1 investigations
Acceptable for some Tier 2 data collection:
• Soil vapor assessment• Soil and ground water assessment, if all required
data can be collected and Title 178 is not violated
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4.5.1 – Monitoring Well Installation
Other methods
May be necessary in certain situations
• Depth to ground water• Shallow bedrock
Contact the Department for approval
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4.5.2 – Monitoring Well Development
Title 178 requires development of all cased water wells
Development must continue until:
Visibly clear water is discharged
Indicator parameters have stabilized
Equilibrium time after development is site-specific and at consultant’s discretion
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4.5.3 – Purging
Must minimize water agitation
Allowable methods:
Pneumatic pumps
Centrifugal pumps
Positive displacement pumps
Bailing (gently)
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4.5.3 – Purging
Coarse-grained materials
Must be purged prior to dissolved sample collection
Purge until:
• A minimum of five well volumes has been removed• Indicator parameters have stabilized
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4.5.3 – Purging
Fine-grained materials
Wells screened at the water table:
• Must NOT be purged
Wells screened below the water table:
• Purge by removal of water to the top of the screen
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4.5.3 – Purging
Mixtures of fine and coarse materials
Attempt to purge as for coarse-grained sediments
If well is in danger of being purged dry:
• Stop purging and proceed with sampling• Document failed attempt in investigation report• The well will be considered “low-yield” and must be
treated as a fine-grained well for all future sampling events
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4.5.4 – Well Abandonment
Two options for wells no longer needed for investigation or remedial activities:
Abandonment in accordance with Title 178
Retention by responsible party or property owner for subsequent use
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4.5.4.1 – Well Retention
Written request specifying:
Well identification number
Site map indicating location
Intended future use of the well
If approved:
Registration transfers to new owner
Owner assumes full responsibility for the well
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4.6 – Free Product
Measurable thickness (≥0.01 feet)
Notify the Department if free product is discovered during the investigation
Additional actions required depend on site conditions
Response flowchart provided in Figure 4-1
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4.6 – Free Product
Depth to ground water ≤ 20’ BGL and subsurface structures are present:
Immediately conduct a vapor assessment and report results
Depth to ground water > 20’ BGL or no subsurface structures present:
Site investigation continues as planned except for no ground water sample collection from wells containing free product
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4.6 – Free Product
Depending on site conditions, the Department may require additional actions
Delineation of the areal extent of the free product plume
Installation and sampling of sentinel wells
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4.7.2 – Soil Sampling
Number of surface soil samples varies by source
UST systems or buried piping
• Collect one sample from each source-area boring if surface soil contamination is present
Land releases:
• One sample from each source area of 100 sq. ft or less• One sample for each additional 400 sq. ft. of affected area.• Refer to Figure 3-1b for example
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4.7.2 – Soil Sampling
Subsurface soil, Tier 1 investigation:
Continuous sampling for source area borings
If evidence of vadose zone contamination is detected in a non-source boring:
• Continuous sampling required for the remainder of that boring
• Samples must be collected as for a source area
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Section 4 -- General RBCA Investigation Requirements 61/130
4.7.2 – Soil Sampling
Subsurface soil, Tier 2 investigation:
Continuous sampling required for:
• Soil contaminant characterization• Geologic cross sections
If vadose zone contamination is detected in a boring outside a known source area:
• Continuous sampling required for the remainder of that boring
• Samples must be collected as for a source area
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Section 4 -- General RBCA Investigation Requirements 62/130
4.7.3 – Ground Water Sampling
Ground water collection methods must minimize agitation
Methods not allowed due to excessive agitation:
Suction pumps
Airlift pumps
Inertial lift pumps (WaterraTM or similar)
Peristaltic pumps
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Section 4 -- General RBCA Investigation Requirements 63/130
4.7.3 – Ground Water Sampling
Acceptable ground water sampling methods include:
Gear-driven pumps
Helical rotor pumps
Pneumatic piston pumps (sealed drive gas)
Bladder pumps
Passive diffusion bag samplers
• Wells screened below the water table• MTBE has not been detected• Vertical aquifer flow gradient is not present
HydraSleevesTM or similar
Bailing (gently)
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Section 4 -- General RBCA Investigation Requirements 64/130
4.7.4 – Subsurface StructureVapor Assessment
Initial screening:
Photoionization detector (PID)
Flame ionization detector (FID)
If elevated levels are observed with the PID/FID:
Use a combustible gas indicator or explosimeter
Immediate notification if readings exceed 1% of the lower explosive limit (LEL)
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Section 4 -- General RBCA Investigation Requirements 65/130
4.8 – Saturated Zone Characteristics
Ground water flow direction
Hydraulic conductivity and gradient
Depth to ground water
Water table fluctuations
Porosity
Calculated ground water flow velocity
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Section 4 -- General RBCA Investigation Requirements 66/130
4.8.1 – Ground Water Flow Direction
Monitoring well locations must avoid a linear arrangement
At least one monitoring well must be 15 degrees or more off-axis to allow for triangulation
Example provided in Figure 4-2
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Section 4 -- General RBCA Investigation Requirements 67/130
4.8.2 – Hydraulic Conductivity
Measured values from slug or pump tests are not required for the Tier 1 or Tier 2 investigations
Values are to be selected from Table 4-3 based on the predominant sediment type
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Section 4 -- General RBCA Investigation Requirements 68/130
4.8.4 – Depth to Ground Water
Water levels used for determining ground water flow direction or preparing ground water contour maps must be obtained during a single measurement event
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Section 4 -- General RBCA Investigation Requirements 69/130
4.8.5 – Ground Water Variations
Provide information about seasonal variations in water table depth and ground water flow direction
Site-specific data
• Observed• Smear zone thickness• Anecdotal
Information from other nearby sites
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Section 4 -- General RBCA Investigation Requirements 70/130
4.8.6 – Porosity
Tier 1 investigations use default values based on the predominant sediment type where a point of exposure is located:
Sands and gravels = 0.30
Silts and clays = 0.35
Tier 2 investigations use site-specific values
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Section 4 -- General RBCA Investigation Requirements 71/130
4.9 – QA / QC Considerations
Samples should be handled quickly, carefully, and consistently
Only costs associated with useable data are eligible for Title 200 reimbursement
If samples must be recollected due to a QA / QC issue, the cost of the first sampling event will most likely not be reimbursed
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Section 4 -- General RBCA Investigation Requirements 72/130
4.9 – QA / QC Considerations
Required QA / QC samples:
“Blind” duplicates
Field blanks
Trip blanks
Temperature blanks (or thermometers)
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Section 4 -- General RBCA Investigation Requirements 73/130
4.9.5 – QA / QC Documents
Chain-of-Custody
Begins when the trip blanks are placed into the sample cooler
Laboratory documents
Spiked-sample analysis results
Chromatograms for all samples
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Section 4 -- General RBCA Investigation Requirements 74/130
4.10 – Documentation
Investigation results must be submitted on the Department’s RBCA Report Forms
Site information and physical characteristics
Sample results
Room provided for simple narratives
Longer narratives, documentation of regulatory variances, or other explanations may be attached if necessary.
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Section 4 -- General RBCA Investigation Requirements 75/130
4.10 – Documentation
Investigation reports must also include:
Maps
Boring and monitoring well data
Cross sections (Tier 2 only)
Sampling data
• Analytical method / version• Lab sheets and chromatograms• Chain-of-Custody sheets
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Section 4 -- General RBCA Investigation Requirements 76/130
4.10.2.1 – Licensing & Registration
Companies and individuals must hold a license issued by DHHS to install, service, or sample monitoring or water wells
All monitoring wells must be registered with the DNR
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Section 4 -- General RBCA Investigation Requirements 77/130
4.10.2.2 – Boring Logs4.10.2.3 – Monitoring Wells
Include the names of all consultant and drilling company personnel present during installation
Provide the DHHS license numbers of personnel involved in installing the boring or monitoring well
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Section 4 -- General RBCA Investigation Requirements 78/130
4.10.2.4 – Soil Vapor Monitoring Wells
Permanent vapor monitoring wells must be registered with the DNR
Include the names of all consultant and drilling company personnel present during installation
Provide the DHHS license numbers of personnel involved in installing the vapor monitoring well
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Section 4 -- General RBCA Investigation Requirements 79/130
4.10.3 – Cross Sections
Tier 1: no cross sections necessary
Tier 2: at least two cross sections
One parallel to ground water flow
One perpendicular to ground water flow
Cross sections must intersect the source area
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Section 4 -- General RBCA Investigation Requirements 80/130
4.10.5 – Electronic Report Submittal
Complete reports may not be submitted via e-mail
In some circumstances, e-mail submittal of specific data may be acceptable:
Departmental approval required in advance
Printed form must still be submitted
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Section 4 -- General RBCA Investigation Requirements 81/130
4.10.5 – Electronic Report Submittal
Supporting information may be submitted on a standard CD-R instead of in printed form:
Laboratory data (if a summary table is provided in the report)
Well registration and abandonment forms
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Section 4 -- General RBCA Investigation Requirements 82/130
4.10.5 – Electronic Report Submittal
If information is submitted on CD:
The CD must be labeled with the site name, DEQ spill number and IIS number, and report name and date
The CD must be titled as an Appendix to the report, with a table of contents included in the printed report listing each file on the CD
Files are to be in PDF format
The CD may be submitted unattached or bound into the printed report
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NDEQ Petroleum Remediation Section 83/130
Break
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Section 5 -- Tier 1 Investigation 84/130
Section 5.0
Tier 1 Site Investigation
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Section 5 -- Tier 1 Investigation 85/130
5.0 – Tier 1 Site Investigation
Direct-push technologies may NOT be used for Tier 1 investigations because Title 178 does not allow their use for the installation of permanent monitoring wells
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Section 5 -- Tier 1 Investigation 86/130
5.2.1 – Subsurface Soil Samples
Number of samples required from each boring depends on the depth to ground water
Examples provided in Figure 5-1
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Section 5 -- Tier 1 Investigation 87/130
5.2.1 – Subsurface Soil Samples
Ground water depth < 10’ BGL:
One soil sample required
Taken at the point of highest contamination as measured by field instrumentation
Sample collected above the capillary zone
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Section 5 -- Tier 1 Investigation 88/130
5.2.1 – Subsurface Soil Samples
Ground water between 10’ and 25’ BGL:
Two soil samples required
Taken at the points of highest contamination as measured by field instrumentation
Samples collected above the capillary zone
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Section 5 -- Tier 1 Investigation 89/130
5.2.1 – Subsurface Soil Samples
Ground water depth > 25’ BGL:
Two or three soil samples required
Two samples must be collected in the initial 25’ BGL at the points of highest contamination as measured by field instrumentation
A third sample is required from the remainder of the boring only if field instrumentation indicates a higher concentration than was identified in the first 25’
All samples collected above the capillary zone
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Section 5 -- Tier 1 Investigation 90/130
5.3 – Ground Water Samples
One sample collected from a monitoring well located upgradient of the source area
To establish background water quality
One sample from each source area
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Section 5 -- Tier 1 Investigation 91/130
5.3 – Ground Water Samples
One sample collected from a monitoring well located downgradient from the source area
If more than one source area is present, sample from the monitoring well where the greatest contamination concentration is expected
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Section 5 -- Tier 1 Investigation 92/130
5.3 – Ground Water Samples
If a water supply well is located within 250’ of the site and may influence the dissolved contaminant plume:
Collect a sample from a monitoring well located between the source and the supply well, screened at depth to address the possibility of vertical contaminant migration
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Section 5 -- Tier 1 Investigation 93/130
5.4 – Waiver of Ground Water Sampling
Drilling to and sampling of ground water may be waived under certain conditions:
All source areas are investigated
Contamination is no longer detected by field instrumentation
The estimated remaining depth to ground water is greater than 25’
Examples provided in Figure 5-2
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Section 5 -- Tier 1 Investigation 94/130
5.4 – Waiver of Ground Water Sampling
If the waiver conditions are met, two additional soil samples are required from each boring:
One from a point at least 5’ below the last indication of contamination
One from a point at least 10’ below the previous sample interval
These samples are in addition to any soil samples collected from points of contamination
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Section 5 -- Tier 1 Investigation 95/130
5.4 – Waiver of Ground Water Sampling
If multiple source areas are present:
Waivers are considered for each source independently
If at least one but not all source areas meet waiver requirements, contact the project manager to determine appropriate locations for remaining upgradient and downgradient monitoring wells
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Section 5 -- Tier 1 Investigation 96/130
5.4 – Waiver of Ground Water Sampling
The ground water sampling waiver may also apply to source area borings that do not encounter any contamination
Anticipated ground water depth must be 50’ or greater
Soil samples required at 25’ BGL and 35’ BGL
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Section 5 -- Tier 1 Investigation 97/130
5.4 – Waiver of Ground Water Sampling
If auger refusal occurs before encountering ground water:
Collect a soil sample from the bottom of the boring for laboratory analysis
Submit the results and collection depth with an explanation in the Tier 1 report
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Section 6 -- Tier 2 Investigation 98/130
Section 6.0
Tier 2 Site Investigation
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Section 6 -- Tier 2 Investigation 99/130
6.0 – Tier 2 Site Investigation
Involves only the exposure pathways where contaminant levels exceeded the Tier 1 RBSLs
Direct-push technology is allowed for some Tier 2 investigation use
CANNOT be used to install permanent monitoring wells
Table 6-1 compares applicability of auger drilling and direct push for the various pathways
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Section 6 -- Tier 2 Investigation 100/130
6.0 – Tier 2 Investigation
Any proposed changes to methods listed in the guidance document must be highlighted and explained in the workplan
If a variance is desired from Title 178 requirements:
Obtain NDEQ agreement in advance
Contact DHHS to request variance
Document in workplan and report
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Section 6 -- Tier 2 Investigation 101/130
6.0 – Tier 2 Investigation
Identify prospective off-site sampling locations and obtain property access as early in the Tier 2 process as possible
Contact NDEQ project manager for assistance if necessary
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Section 6 -- Tier 2 Investigation 102/130
6.0 – Tier 2 Investigation
Involves only the exposure pathways where contaminant levels exceeded the Tier 1 RBSLs
Ground water ingestion
Soil leaching to ground water
Vapors from contaminated ground water
Vapors from contaminated subsurface soil
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Section 6 -- Tier 2 Investigation 103/130
6.1.1 – Ground Water Ingestion
The horizontal dimensions of the dissolved contaminant plume must be delineated to the levels listed in Table 4-2
All monitoring points (including Tier 1 monitoring wells) must be sampled for all applicable COCs
Assessment of the possibility of vertical contaminant migration may be required
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Section 6 -- Tier 2 Investigation 104/130
6.1.2 – Soil Leaching to Ground Water
Vadose zone soil contamination must be delineated around each source area
Example provided in Figure 6-1
Tier 2 borings must be sampled for all applicable COCs
Number of required samples is different from Tier 1
One sample per boring from depths < 25’ BGL
One additional sample per boring from depths > 25’ BGL
Samples to be taken from points of maximum contamination
Soil physical / chemical parameters must be determined
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Section 6 -- Tier 2 Investigation 105/130
6.1.3 – Vapors from Ground Water
New vapor survey of all subsurface structures must be performed, including:
Monitoring results
Owner’s contact information
Typical use of each structure
Pathway can be assessed in two ways:
Using ground water samples
Using soil vapor samples
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Section 6 -- Tier 2 Investigation 106/130
6.1.3 – Vapors from Ground Water
Assessment using ground water sampling
Delineate the extent of the dissolved contamination to the levels in Table 4-2 for all applicable COCs
Collect soil samples from the vadose zone to determine physical / chemical parameter values
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Section 6 -- Tier 2 Investigation 107/130
6.1.3 – Vapors from Ground Water
Assessment using soil gas sampling
Install monitoring points within three feet above the capillary zone in the following locations:
• All source areas• Adjacent to all on-site and the nearest off-site structures• At least one location between the source areas and each
structure
Collect soil gas samples from each monitoring point and analyze for applicable COCs
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Section 6 -- Tier 2 Investigation 108/130
6.1.4 – Vapors from Contaminated Soil
New vapor survey of all subsurface structures must be performed, including:
Monitoring results
Owner’s contact information
Typical use of each structure
Pathway can be assessed in two ways:
Using soil samples
Using soil vapor samples
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Section 6 -- Tier 2 Investigation 109/130
6.1.4 – Vapors from Contaminated Soil
Assessment using soil sampling Delineate the extent of the soil contamination within
the upper 25’ of the vadose zone Locate at least one boring as close as possible to
structures within the area of contaminated soil, between the structure and the source
Collect two soil samples from each boring:• Points of highest contamination as measured by field
instruments• Both samples must be collected above the water table
Collect soil samples from the vadose zone to determine physical / chemical parameter values
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Section 6 -- Tier 2 Investigation 110/130
6.1.4 – Vapors from Contaminated Soil
Assessment using soil gas sampling
Install monitoring points above the capillary zone in the following locations:
• All source areas, within the soil contaminant mass*• Adjacent to all on-site and the nearest off-site structures, at
three feet BGL or the depth of the structure’s footings, whichever is greater
• At least one location between the source areas and each structure, within the soil contaminant mass *
Collect soil gas samples from each monitoring point and analyze for applicable COCs
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Section 6 -- Tier 2 Investigation 111/130
6.2 – Soil Characteristics
Site-specific values required for the fate and transport equations for all exposure pathways
Soil porosity
Capillary zone thickness
Selected from values in Tables 6-2 and 6-3, rather than sample analysis
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Section 6 -- Tier 2 Investigation 112/130
6.2 – Soil Characteristics
Chemical and physical parameters required for the soil leaching to ground water exposure pathway
Soil dry bulk density
Volumetric water content
Fractional organic carbon
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Section 6 -- Tier 2 Investigation 113/130
6.2 – Soil Characteristics
Chemical and physical parameters required for the inhalation exposure pathways if assessment is based on soil or ground water samples
Soil dry bulk density
Volumetric water content
Fractional organic carbon
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Section 6 -- Tier 2 Investigation 114/130
6.2 – Soil Characteristics
Chemical and physical parameter value determination is not required for sites where:
Only an inhalation pathway is being assessed
and
Soil gas samples are used instead of soil or ground water contamination values
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Section 6 -- Tier 2 Investigation 115/130
6.3.1 – Soil Gas Sampling Points
May be temporary or permanent
Construction of permanent monitoring points should be similar throughout the site
Acceptable installation methods include:
Direct-push technologies
Auger drilling
Hand-installed (with Department approval)
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Section 6 -- Tier 2 Investigation 116/130
6.3.2 – Soil Gas Sampling
Sample point must be sealed to exclude ambient air
Purge before sampling
Sample analysis options:
Field gas chromatograph
Collected in a summa canister for laboratory analysis
Collected in a Tedlar bag for laboratory analysis within 72 hours of sample collection
No duplicate samples or blanks are necessary
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Section 7 -- Risk-Based Evaluation (General) 117/130
Section 7.0
Risk-Based Evaluation:
General Considerations
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Section 7 -- Risk-Based Evaluation (General) 118/130
7.0 – Risk-based Evaluation
Site Conceptual Exposure Scenario (7.2)
Target Levels (7.3)
Ground water (7.4)
Indoor air quality (7.5)
Surface soils (7.6)
Surface water & ecology (7.7)
Representative contaminant concentrations (7.8)
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Section 8 -- Tier 1 Evaluation 119/130
Section 8.0
Tier 1 Evaluation
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Section 8 -- Tier 1 Evaluation 120/130
8.3 – Look-Up Tables
Table 8-11 is provided for surface water or ecological exposures from contaminated ground water
Table 8-12 is provided for surface water or ecological exposures from contaminated soils leaching to ground water
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Section 9 -- Tier 2 Evaluation 121/130
Section 9.0
Tier 2 Evaluation
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Supplemental Information 122/130
Supplemental Information
List of Acronyms (p. vii)
References (10.0)
Glossary (11.0)
Appendices
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Appendices 123/130
Appendices
PAH Evaluation using Total Hydrocarbons
Tier 1 Report Forms
Tier 2 Report Forms
Target Level Default Data
Fate & Transport Equations
Contact List
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Appendices 124/130
Appendix B – Tier 1 Report Forms
Added forms for:
Consultant and licensing information
GPS Coordinates
Additional sheets for analytical data
Space for comments and notes is limited
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Appendices 125/130
Appendix C – Tier 2 Report Forms
Added forms for:
Consultant and licensing information
GPS Coordinates
Additional sheets for analytical data
Space for comments and notes is limited
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Appendices 126/130
Appendix F – Contact List State agencies and other organizations that pertain
to site investigations or remedial activities Department of Environmental Quality State Fire Marshal Department of Health & Human Services Department of Natural Resources Nebraska Board of Geologists Nebraska Board of Engineers & Architects Nebraska Natural Resource Districts U.S. Environmental Protection Agency
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NDEQ Petroleum Remediation Section 127/130
Implementation
New guidance document and report forms will take effect on May 1, 2009
All investigations started on or after that date
Procedures can be used for investigations currently in progress
• Contact project manager
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NDEQ Petroleum Remediation Section 128/130
More Information
Copies of the guidance document and report forms are available from:
NDEQ website (deq.ne.gov)
NDEQ Petroleum Remediation Section
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NDEQ Petroleum Remediation Section 129/130
Future Information
NDEQ RBCA Update e-mail list
Questions & Information page will be added to the Petroleum Remediation Section part of the NDEQ website
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NDEQ Petroleum Remediation Section 130/130
Questions?