Capping of Landfill Containing Hazardous Materials. Water Resources Research Center Conference

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1 Capping of Landfill Containing Hazardous Materials Frank Caluya, Jr. P.E. PACDIV Water Resources Research Center Conference January 2003

2 Former Naval Air Station (NAS) Agana Landfill Removal Action NAS Agana NAS Agana NAS Agana Landfill Site Location Map In 1983 the Naval Energy and Engineering Support Activity (NEESA) conducted an Initial Assessment Study (IAS) at naval facilities in Guam.

3 Former NAS Agana (Tiyan) Landfill Removal Action cont. The IAS identified the NAS Agana landfill as a source of potential environmental liability and recommended further investigation Landfill received military, construction, and household refuse before operation ceased in Buried and surficial refuse occupy a 27-acre area extending to 25 feet below ground surface (bgs)

4 Site Investigations (I) Drilling at the Landfill Four and six groundwater monitoring wells were installed in 1987 and 1992 respectively Soil and soil gas analyses were conducted in 1992 and 1993 Thirteen rounds of groundwater monitoring were conducted from 1993 through Groundwater is about 215 feet bgs. Chemicals of potential concern (COPCs) slightly above drinking water standards were identified

5 Site Investigations (II) Additional site investigations were conducted in 1998 and 1999 Excavated 20 trenches and 116 test pits Drilled 32 soil boreholes Installed 12 leachate wells and 12 landfill gas wells Analyzed soil, leachate and landfill gas samples Trenching at the Landfill

6 CERCLA Removal Action Process Flow Chart Per the Comprehensive Environmental Response Compensation and Liability Act (CERCLA) the Navy proposed a non-time critical removal action The removal action process includes 9 steps with public participation

7 CERCLA Removal Action Process Flow Chart Remedial Investigation/ Removal Site Evaluation EE/CA Public Comment Action Memorandum EE/CA 1. Analyze existing data 2. Define areas of contamination 3. Evaluate human and ecological risk 4. Identify removal action objectives 5. Identify removal action alternatives 6. Analyze removal action alternatives 7. Recommend and describe site-specific removal action Removal Action Design Documents Removal Action Implementation Remediation Verification Report Record of Decision Final Remedy

8 Removal Action Objectives Protect human health and the environment Maximize available land for future industrial use

9 Evaluation of Closure Alternatives Following U.S. EPA presumptive remedy and Resource Conservation and Recovery Act (RCRA) Subtitle D guidance for landfill closure five alternatives were evaluated Refuse removal and on-island / off-island disposal Refuse consolidation and capping with on-site clay Refuse consolidation and capping with geosynthetic clay liner (GCL) Refuse consolidation and capping with polyvinyl chloride (PVC) membrane Refuse consolidation and capping with asphalt

10 Closure Alternative Evaluation Criteria Follow the CERCLA removal action evaluation criteria Overall protection of human health and the environment Compliance with ARARs Long-term effectiveness and permanence Reduction of toxicity, mobility, or volume through treatment Short-term effectiveness Implementability Cost State Acceptance Community Acceptance

11 Landfill Grading Plan Consolidate refuse from 27 acres into an 8-acre footprint Minimum 3% slope grade to promote drainage 2000 feet of drainage ditches lead to two storm water basins 1000 feet of vertical moisture barrier

12 Landfill Final Cover Systems Final cover system consists of A bottom geocomposite layer for gas venting A geosynthetic clay liner (GCL) as barrier A top geocomposite layer for drainage A 3-foot thick vegetative soil cover

13 Post Removal Action Monitoring and Maintenance Periodic monitoring and maintenance (M&M) will be conducted for: Integrity of the final cover system Perimeter drainage structures Groundwater monitoring wells Landfill gas vents and gas monitoring wells Conduct 5-year CERCLA review before modifying the M&M program

14 Landfill Removal Action (Closure) Implementation (1) Clearing and grubbing Off-site clean soil borrow area Stockpile clean borrow soil for vegetative cover Truck decontamination station

15 Landfill Removal Action (Closure) Implementation (2) Refuse removal Suspected UXO uncovered Refuse placement and dust control Excavated metal scrap to be recycled Uncovered metal cylinders and spent shell

16 Landfill Removal Action (Closure) Implementation (3) WWII Japanese bunker uncovered Confirmation soil sampling Raise soil vapor monitoring well Raise groundwater monitoring well

17 Landfill Removal Action (Closure) Implementation (4) Final cover foundation layer Final cover system installation Final cover side slopes with anchor trench GCL sandwiched by geocomposites with vegetative soil cover on top HDPE moisture barrier trench Backfill moisture barrier trench Landfill gas vent construction

18 Landfill Removal Action (Closure) Implementation (5) Soil density test using sand cone Soil density test using nuclear density gauge Install silt fence for erosion control during construction Post storm landfill side slopes

19 Landfill Removal Action (Closure) Implementation (6) Riprap drown drain and energy dissipator Grading V-ditch subgrade Concrete V-ditch joins energy dissipator

20 What s Ahead Complete Landfill Cap Construction Finalize EE/CA and Record of Decision Implement Institutional Controls Start Long-Term Monitoring and Maintenance

21 Questions Point of Contact Frank Caluya, Jr. P.E. BRAC Environmental Coordinator, ENV1824FC Commander, Pacific Division Naval Facilities Engineering Command Pearl Harbor, HI Tel: (808) Fax: (808)

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