Attachment_J.1_Approved_EIA_Summary.pdf

HIGHLIGHTS

Environmental Impact Assessment Report

The Dioxin Remediation at Bien Hoa Airbase Area Project

1. General Information Project Title: The Dioxin Remediation at Bien Hoa Airbase Area Project Project Owner: Air Defense – Air Force Command (ADAFC) Project Policy approved by Prime Minister Project approved by Ministry of National Defense (MND) Environmental Impact Assessment (EIA) prepared by ADAFC and New Technology Institute/Ministry of National Defense EIA preparation team:

No Full name Major Lead

ADAFC

1 Col. Pham Quang Vu Director of Science Office Oversee EIA consultants 2 Lt. Col. Nguyen Xuan Trong Assistant of Science Office Coordinate with EIA consultants New Technology Institute 3 Dr. To Van Thiep Chemistry 4 Dr. Nguyen Van Hoang Chemistry 5 Dr. Pham Hoai Nam Environment 6 Dr. Nguyen Le Tu Quynh Environment 7 Others

Current Landuse Status − There are about 1200 people living and about 2200 people at peak working at the airbase − There are 20 military units in the fenced military barracks on the Airbase − There are training activities of air forces mainly in the east of the logistic area − In the south east of the runway is a factory (about 50 ha) − Part of the airbase is currently being used as storage area − The activities under the Infrastructure and pre-treatment construction at Bien Hoa airbase project: new military barrack construction – 15,611 m2, project hauling road – 10,444 m and migration prevention measures – 2,400 m.

− The north part of the airbase is for farming and rubber plantation.

− There are 1.5 m – high bushes and other long-life trees such as eucalyptus and acacia in the project area.

Dioxin Contamination Levels of different areas with different landuse purposes at Bien Hoa Airbase Area

− Table 1.1, EIA – Dioxin Contamination at Bien Hoa Airbase area is re-edited from the dioxin contaminated volumes reported in the USAID’s Environmental Assessment 2016 (EA).

− Official Document 550/UBND-CNN on Oct 1st, 2018 of Dong Nai People’s Committee provided estimation of 40,000 m3 off-base soil/sediment (Neighborhood 5, Buu Long Commune adjacent to PI-12 and PI-15: 36,000 m3, Access road to Tran Bien Literature Temple – proximity of Airbase fence: 1,700 m3, Gate 2 Lake: 2,000 m3, and A42 Gate) .

2. Main Project Contents

2.1. Project Goal and Objectives

Overall Goal: To remediate dioxin contaminated soil and sediment at Bien Hoa airbase to ensure no dioxin exposure risks to the people and environment at the Bien Hoa airbase area.

Specific Objectives:

− Treat 222,277 m3 of contaminated soil/sediment having dioxin concentration > the maximum allowable limit specified in QCVN 45:2012/BTNMT (> 1200 ppt) down to < 100 ppt

− Isolate 298,395 m3 of contaminated soil and sediment (< 1200 ppt) Project Area: Bien Hoa airbase and its proximity

2.2. Quantity and Scale of Project Activities

Contaminated Soil and Sediment Volumes to be remediated at Pacer Ivy Area (Table 1.2 in EIA)

No Location DUs Contaminant Volumes (M3) Soil Sediment Subtotal

On-base Pacer Ivy Soil: PI-2, PI-8A, PI-10, PI-13A 117,700 Sediment: PI-17A&B, PI-18, PI-20 32,500 Subtotal 150,200

Off-base Pacer Ivy Soil: PI-12 10,400 Sediment: PI-15 9,600 Subtotal 20,000

2 North West Soil 15,480 Sediment: NW-3C, NW-4A 6,600 Subtotal 22,080

3 North Forest Soil: NF-4A&B 34,300 Sediment - Subtotal 34,300

4 North East

Soil: - Sediment: NE-7, NE-8A&B, NE-9, NE-11, NE-12, NE-15C 25,000

Subtotal 25,000

5 Off-Base Đất 6,023 Sediment Subtotal 6,023

6 Contingency 40,300 Total 177,880 73,700 297,903

Contaminated Soil and Sediment Volumes to be remediated at Pacer Ivy Area (Table 1.6 in EIA) Volumes (m3) Pacer Ivy North West North Forest North East Off-base Subtotal (m3) Isolation 47,600 22,080 34,300 23,900 168,180 Soil 27,600 15,480 34,300 0 77,380 Sediment 20,000 6,600 0 23,900 50,500 Contingency 40,300 Treatment 122,600 0 0 1,100 6,023 129,723 Soil 100,500 0 0 0 6,023 106,523 Sediment 22,100 0 0 1,100 0 23,200 Total 170,200 22,080 34,300 25,000 39,700 297,903

Contaminated Soil and Sediment Volumes to be remediated in the Project (Table 1.8 in EIA) Volumes (m3) Pacer Ivy Z1 Total Isolation 168,180 130,215 298,395 Soil 77,380 63,815 141,195 Sediment 50,500 17,400 67,900 Contingency 40,300 49,000 89,300 Treatment 129,723 92,554 222,277 Soil 106,523 90,854 197,377 Sediment 23,200 1,700 73,900 Total (m3) 297,903 222,769 520,672

2.3. Four-Phase Project Implementation Approach: Preparation – Construction – Operation – Close-out Sub-phase Activity Environmental Impacts Site Preparation Site clearance, Filling and

Grading CTR, Dust, Gas Discharges

Construction Dig&Haul, IPTD Structure, Storage Areas, Environmental Monitoring…

Dust, Noise, Surface and GW pollution risks, ecological impacts

Operation Treatment/Isolation of contaminated materials

Energy, Secondary Pollutants, Climate Change Risks to operation…

Close-out GW Monitoring, Storage O&M Erosion, Recontamination, Waste Discharges…

Main features of In-Pile Thermal Desorption (IPTD) structure (Table 1.9 – EIA)

General Design Criteria Pile Structure Location and Dimension Criteria

- Target soil/sediment temperature: 335oC - Center-based location to reduce hauling distances

- Flexible design allow ±10% volume change

- Non-contaminated area to allow immediate construction

- Flexible utilization of domestic and

American materials to comply with USAID criteria

- Pacer Ivy elevations are higher than those of the North and East areas that are prone to flooding.

- Pile structure is extensible to cope with material volume change

- Location complies with required distance from the runway and height restriction of Guidance 150-5300-13 of NASA

- Easy construction sequence to cope with weather-driven interruptions.

- Total height of 7.5 – 8.0 m

- Others - Others Notes: Detailed Design of Pile Structure was presented in USAID Design Package 2010.

2.4. Selected Remediation Technology Alternative

Landfill Design Solution − Landfill is designed according to Decision 60/2002/QD-BKHCNMT and complies with USEPA requirements which include technical guidance on hazardous waste landfill design. Landfill is designed half-below and half-above the ground and divided into square cells. Landfill sites have an area of about 20 ha.

− Main features of landfill are depicted in Figure 1.11 EIA (similar to Figure 4-5 EA)

− Detailed design is specified and illustrated in Figures 1.12 – 1.16 EIA; including specification of cover, bottom lining, and gas and leachate collection systems.

TCH Design Solution

− TCH system is designed according to the IPTD approach; capacity of each structure is 50,000 m3/batch (W: 70 m, L: 120 m and H: 6 m).

− 01 TCH structure is constructed at each of Pacer Ivy and Z1;

Treatment performance:

− Dioxin in treated soil/sediment ≤ 100 ppt (TEQ) − Gas discharge in compliance with TCVN 9737:2013, QCVN 06:2009/BTNMT, QCVN

20:2009/BTNMT

− Wastewater in compliance with the Regulation QCVN 40:2011/BTNMT (Column B) and TCVN

9737:2013 − Dust in compliance with QCVN 19:2009/BTNMT

Project Schedule (Table 1.14 EIA)

No Content Proposed Time Lead 1 Investment preparation and consultation (EIA, Feasibility

Technical Design and Total Cost Estimation), UXO clearance 2018 − 2019 Project Owner

2 Infrastructure Construction, Dig&Haul, Soil/Sediment Analysis, IPTD Construction, Environmental Monitoring

2020 − 2021 Project Owner

3 Treatment of 129,723 m3 of contaminated soil/sediment at Pacer Ivy, isolation (landfill) site construction …

2022 − 2023 Project Owner

4 Isolation of 168,180 m3… 2022 – 2024 Project Owner 5 Dismantling, backfilling, restoration, Phase 1 evaluation and acceptance 2025 Project Owner

6 Treatment of 92,554 m3 of contaminated soil/sediment at Z1 2026 – 2027 Project Owner 7 Isolation of 130,215 m3 of contaminated soil/sediment 2026 – 2028 Project Owner 8 Dismantling, backfilling, restoration, Project evaluation and acceptance 2029 Project Owner