Long-Term Management of Contaminated Soil and Groundwater – Iwilei District, Honolulu April 16, 2015.

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Presentation transcript:

Long-Term Management of Contaminated Soil and Groundwater – Iwilei District, Honolulu April 16, 2015

References: HIDOH 2015 Programmatic EHE/EHMP Document, Iwilei District, Honolulu, Hawaii, Hawaii Department of Health Office of Hazard Evaluation and Emergency Response, March 2015 HIDOH, 2011, Evaluation of Environmental Hazards at Sites with Contaminated Soil and Groundwater (Summer 2008, updated March 2009): Hawai’i Department of Health, Office of Hazard Evaluation and Emergency Response, HIDOH, 2009, Technical Guidance Manual: Hawai’i Department of Health, Office of Hazard Evaluation and Emergency Response,

The Iwilei District

315 Acres Multiple land owners and responsible parties Commercial / Industrial use Bulk Fuel Terminals Former MGP Site Active/Inactive Petroleum Pipelines Dole Cannery Petroleum Contaminated Soil, Soil Gas and Groundwater Debris Contaminated Soil

The Remedial Process Historical Records Review Advanced Evaluation of Identified Concerns Selected Remedy Site Investigation/ Environmental Hazard Evaluation Remedial Alternatives Analysis Response Action Memorandum Long term management- Environmental Hazard Management Plans

Direct Exposure Groundwater Prevailing Wind Direction Leaching Default Conceptual Site Model of Potential Environmental Hazards Gross Contamination Ecotoxicity Stream Discharge to aquatic habitats Free Product Dissolved plume Leaching Drinking Water Vapor Intrusion Soil

Iwilei Environmental Hazards -Petroleum- SOIL INDOOR AIR SOIL GAS Aquatic Habitats Human Health Drinking Water (toxicity) Vapors Intrusion Gross Contamination Terrestrial Habitats Leaching Direct Exposure Vapors Intrusion Human Health Gross Contamination GROUNDWATER

Iwilei Environmental Hazards -Lead, pesticides, etc.- SOIL INDOOR AIR SOIL GAS Aquatic Habitats Human Health Drinking Water (toxicity) Vapors Intrusion Gross Contamination Terrestrial Habitats Leaching Direct Exposure Vapors Intrusion Human Health Gross Contamination GROUNDWATER

EHE Report Site Background Summary of investigations Comparison of site data to action levels EHE: Identification of potential hazards Advanced evaluation of targeted hazards Conclusions & Recommendations Summarize findings Addition site investigation Advanced evaluation of targeted hazards Prepare remedial action plan Prepare EHMP

Environmental Hazard Management Plans (long-term management of residual contamination) Same information as in EHE Usually include as appendix in closure report Include to-scale maps of affected areas Summarize site restrictions & management needs soil & groundwater management caps, vapor barrier systems, etc. deed restrictions, etc. Consider EHMP in budget for future development & maintenance

Three types of EHMPs  Pre-construction  Site-specific  Programmatic

EHMP Lowe’s Site, Honolulu

Gross Contamination (combined) Primary Drivers: TPH aliphatics,

Vapor Intrusion Hazards (soil data) Primary Drivers: TPH aliphatics,

Vapor Intrusion Hazards (groundwater data) Primary Drivers: TPH aliphatics, Benzene (GASCO)

Discharge to Surface Water Hazards (groundwater data) Primary Drivers: TPH aliphatics,

Pre-Construction Remedial Action Reduce vapor intrusion & gross contamination concerns; Soil excavation and on-site treatment (thermal desorption) Manage remaining contamination in place under EHMP (on and off-site).

Vapor System Piping Vapor Barrier Vapor Membrane Soil Vapor Control System Lowe’s Vapor Mitigation System (subslab)

Smoke Testing V ent Risers Vent Conduits Lowe’s Vapor Mitigation System (subslab)

What is the Programmatic Iwilei EHMP for? 1.Document specific environmental hazards known to be spread throughout the area 2.Provides guidance for the management of contamination in common areas where investigative data is unavailable 3.Promotes regulatory consistency throughout the area with regard to petroleum contamination 4.Protects agencies and entities (e.g. HECO, Board of Water) doing intrusive work in the area

What the Programmatic EHMP Does NOT Do 1.Does not supercede existing EHMPs on remediated sites 2.Does not absolve an RP from characterization or cleanup of a Site 3.Does not exempt RPs from other applicable State laws and rules 4.Does not absolve RP from developing a Site-Specific EHMP in the future

Key Features 1.Specific direction on dealing with petroleum contamination in all types of media 2.Short forms to streamline reporting requirements to HDOH 3.Contingency plans for various scenarios contractors may face 4.Contains procedures commonly used at other Sites

Accessing the EHMP  Download from the HEER office webpage:  Request a copy:

Questions? Interested in a specific topic? Interested in presenting? Contact us with your suggestions!

Upcoming Webinars (contact When: May 11, 2015, 12:00 PM – 1:00 PM, Hawaii Time Who: Steve Nigro, Regenesis Kelly Smith, Landscienece Tech What: New Regenesis & Landscience Accelerated Bioremediation Technology Interested in a specific topic? Interested in presenting? Contact us with your suggestions!