Rhode Island Department of Environmental Management

Office of Waste Management (OWM)

Cynthia Gianfrancesco222-4700 X7126Terry Gray X2405

Overview of Tonight’s Topics Site Investigation Process Charbert Overburden Site Investigation Charbert Overburden Remediation Charbert Bedrock Aquifer Investigation Production Well Shutdown Oversight and Enforcement Site Security Communications Upcoming meetings

RIDEM Site Investigation and Remediation Program All Site Investigations must be conducted in accordance

with RIDEM regulations.

Investigation must include• Soil• Groundwater

• Overburden • Bedrock – if necessary

• Sediment - if necessary• Surface water - if necessary

Frequently includes a phased approach, especially where complex geology exists

Exceedances of RIDEM criteria must be identified and remediated

RIDEM Site Investigation and Remediation Program

Remediation Criteria Include: Soil:

• Direct Exposure Criteria for• Residential properties• Industrial/Commercial properties (Charbert site)

• GA or GB Leachability Criteria

Groundwater Criteria• GA criteria – suitable for drinking (Richmond & rural

areas)• GB criteria – not suitable for drinking (urban areas)

Site Investigation Pertaining to the Charbert Site

Site Investigation at the Charbert site was divided into 2 phases due to the presence of Chlorinated Solvents:

Overburden Site Investigation Report was submitted in June 2005 Supplemental Reports 1-9-06, 4-28-06

and 8-7-06

Bedrock Investigation is on going

Example of Aquifer

Shallow overburden aquifer ~ 50’ – 80’ thick

Confining layer ~ 10’ – 20’ thick

Deep overburden aquifer ~ 10 – 20’ thick

Bedrock aquifer ` 40’ – 120’ deep

Overburden Site Investigation

Over 40 monitoring wells installed 70 groundwater analysis 6 wells sampled quarterly around lagoons 14 wells sampled quarterly around SVE/AS

Over 70 soil analysis Over 40 private well analysis

Quarterly analysis of 14, 16 & 18 River St. since February 2005.

8 Diffusion Bag sample location in Wood River - samples groundwater under river

Overburden Site Investigation

Identified Areas of Concern (AOCs) requiring action:

Chlorinated solvent (drycleaning) spill area Residential Wells at 14, 16 & 18 River Street Solid Waste Disposal Areas Old Lagoon 5 Channel sediments Petroleum Product Recovery Trench Oil Line Rupture Environmental Land Use Restriction

Overburden Remedial Action Work Plan

October 2007 – ongoing source removal Chlorinated solvent spill area Soil Vapor Extraction/Air Sparge System Order of

Approval issued by RIDEM December 19, 2007 Air Sparge System – injects air into ground, enhances

bioremediation and strips vapors from groundwater

Soil Vapor Extraction System – enhances bioremediation and vacuums vapors from soil

Sparge Curtain – prevents migration of contaminants in groundwater to Wood River

All treated through Granular Activated Carbon prior to discharge to air

System fully operational on January 18, 2008

Extensive monitoring of system, groundwater and river to determine system performance

Water table

groundwater

soil

Air

vacuum

Treatment

16 SVE and 16 AS wells under building9 Horizontal SVE and 9 AS wells between building and river5 Horizontal SVE and 5 AS wells as Sparge Curtain along river

GZML-1

Overburden Remedial Action Work Plan October 2007 - ongoing

Residential Wells at 14, 16 and 18 River Street

These wells were identified as needing treatment due to trace levels of chlorinated solvents and bacteria.

Possible source: former septic system

Whole House Treatment Systems were installed in January 2005 by Charbert and have been operational since.

Charbert will continue to monitor quarterly and maintain as long as is necessary.

Overburden Remedial Action Work Plan

October 2007 Remaining RAWP Action Items for

approval Solid Waste Disposal Areas

• Four areas identified during site investigation• Solid waste removed in 2006 and areas

subsequently restored• Limited soil excavation required in one area

for elevated arsenic

Overburden Remedial Action Work Plan October 2007

Remaining RAWP Action Items for RIDEM approval (con’t) Old Lagoon 5 Channel sediments removal Petroleum Product Recovery Trench Oil Line Rupture removal Long Term Monitoring Environmental Land Use Restriction

All Activities expected to be on-going or completed by December 2008

Bedrock Aquifer Investigation – completed to date

Bedrock Aquifer Evaluation Work Plan–March 2006 Geophysical Investigation (ground penetrating radar) for

Bedrock Aquifer Evaluation, and Recommended Bedrock Well Locations July 2006

Bedrock Wells Installed & Borehole Geophysics conducted August – December 2006

Recommended Monitoring Well Packer Installation Zones for Bedrock Boreholes, February 2007

Bedrock Aquifer Evaluation Progress Report #2, Sept. 2007

Phase II Bedrock Aquifer Evaluation Work Plan, January 29, 2008 (under review)

3 bedrock wells installed 2006GZML-1 ( 205 feet deep) = trace levels of VOCsGZML-2 (206 feet deep) = cleanGZML-3 (160 feet deep) = high levels of VOCs

GZML-1

Bedrock Aquifer Investigation Geophysical report indicates bedrock fractures

are tilted away from Alton neighborhood, towards Wood River

September 2007 report confirmed bedrock contamination and zones (June and August sample results)

November 2007 DEM assisted Charbert in sampling 4 wells west of Wood River - no VOC contamination detected

RIDEM unable to confirm use of bedrock wells in Alton neighborhood.

Bedrock Aquifer Investigation Schedule

Additional data collection, evaluation and well location proposal: February - August 2008

Bedrock well installation :September 2008 – March 2009

Bedrock well sampling: March – April 2009

Bedrock Aquifer Site Investigation Report: April - June 2009.

Production Wells Shutdown Production wells are still being used to a limited extend

during plant shutdown

Groundwater monitoring began Feb. 18, 2008 and will continue until equilibrium has been reached to determine changes in groundwater flow, then quarterly thereafter

The groundwater depression associated with the production wells will revert to a natural state – this is not expected to adversely effect groundwater quality on the site

The groundwater mound associated with the lagoons will revert to a natural state – it is expected that this will improve groundwater quality on the site

DEM Oversight and Enforcement of Investigation and Remediation

Charbert’s parent company, NFA Corporation, is the responsible party

They are held to conducting all required work through the Consent Agreement and state law

In the event that they fail, DEM enforce through Superior Court

Site Security

According to Charbert:

Property Manager on site 40 hrs/week indefinately

Security System installed in building

Communications Documents at Clark Memorial

Library

DEM web site - with major documents and milestones

Upcoming Meetings April 2nd – Site Investigation and

Remediation 2nd meeting – Lagoons, Wetlands

and Plant Closure 3rd meeting – drinking water 4th meeting – tentative – if necessary