Review of Current Conditions Report and Work Plan for Area 1

1
Review of Current Conditions Report and Work
Plan for Area 1

• Presented by
• The Great Plains/Rocky Mountain Technical
  Outreach Services for Communities

2
Report Organization

• 1. Introduction
• 2. Current Conditions
• 3. Facility Dismantling Procedures
• 4. Assessment Locations
• 5. Soil Boring and Monitoring Well Installation
  Procedures
• 6. Soil and Stream Sediment Field Screening and
  Sample Collection and Handling Procedures
• 7. Groundwater Monitoring Well Development and
  Sampling Procedures and Surface Water Sampling
  Procedures
• 8. Determination of Remediation Objectives
• 9. Soil Remediation Procedures
• 10. Documentation and Reporting
• 11. Selected References

3
Introduction

• Area 1 is about 14 acres, 2 miles long, 60 feet
  wide
• goal of process is to obtain a No Further
  Remediation (NFR) letter from IEPA
• Area 1 is to be a bicycle trail
• plan to remediate soil as necessary
• and/or install an engineered barrier
• groundwater remediation if necessary would occur
  while Area 1 is in use

4
Current Conditions

• Area 1 includes
• underground concrete and piping from several
  buildings that need to be removed
• a septic tank and piping from office building to
  ditch on Eastern plant boundary
• no recorded spills within Area 1 boundaries
• groundwater less than 10 feet below surface, flow
  is 0.05 to 0.57 feet per year

5
Current Conditions

• no SWMUs in Area 1
• storm water drainage is to the North and South
  Stormwater Ponds
• Area 1 crosses 5 wetland areas

6
Preliminary soil assessment (Feb 2000)

• 62 samples from 23 borings
• Appendix B tables organic chemicals
• Tier I remediation objectives exceeded
• benzene at 2 to 4 feet in two locations (BC-4 and
  BC-10)
• benzo(a)pyrene at 0 to 2 feet in two locations
  (BC-12 and BC-22)
• benzo(a)fluoranthene and benzo(a)anthracene also
  at BC-12

7
Preliminary soil assessment (Feb 2000)

• Appendix B tables organic chemicals
• benzo(a)pyrene at 0 to 2 feet in two locations
  (BC-12 and BC-22)
• the detection limit for this chemical is greater
  than the calculated soil remediation objective by
  about 4 times.
• There appear to be no Tier I remediation
  objectives for 1-methylnaphthalene,
  2-methylnaphthalene and phenanthrene
• will Tier II calculations be required by IEPA?

8
Preliminary soil assessment (Feb 2000)

• Appendix B tables inorganic chemicals
• beryllium in 48 of 62 samples
• arsenic in 61 of 62 samples
• It appears that this is a natural occurrence of
  these metals. The average amounts are similar to
  reported values for Will county.

9
Environmental Audit (July 1990) Appendix H

• 2 sampling locations overlap Area 1 (F3 and F4)
• toluene, trichloroethylene, and oil and grease
  were detected

10
Facility Dismantling Procedures

• fluids will be removed from pipes with vacuum
  trucks and burned for energy recovery
• water in pipes or structures will be tested and
  released, treated or shipped offsite, as
  appropriate
• a cross section of Area 1 will be trenched to
  search for unknown structures
• geophysical surveying will be used to identify
  unknown structures

11
Future Assessment Plans

• at least one soil sample from under each
  structure in Area , except lunch room and gate
  house
• at least one soil sample for every 250 feet along
  length of Area 1
• up to 3 monitoring wells will be installed in
  Area 1
• upstream and downstream surface water and
  sediment will be sampled for each stream crossing
  Area 1

12
Remediation Objectives

• If Tier I remediation objectives are exceeded,
• soil or groundwater will be cleaned up
• an engineered barrier will be used, or
• a Tier 2 evaluation will be done.

13
Remediation procedures

• Petroleum impacted soil will be removed
  immediately when found
• stops ongoing migration of contaminants to
  surrounding soil and groundwater
• sidewalls and bottom of excavation will be
  sampled and tested for remaining contamination

14
Documentation and Reporting

• maps showing location of former piping and
  structures
• summary of assessment and cleanup procedures
• figures and tables showing sample locations,
  where soil was removed, screening and laboratory
  results
• laboratory reports
• description of procedures followed
• summary of management and final disposal of
  contaminated soil