“Remediation and Redevelopment of Historical...

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“Remediation and Redevelopment of Historical Metals Smelter Site Midvale Slag Superfund Site

Operable Unit One” Midvale, Utah USA

David S. Wilson, P.E., P.G.Environmental Resources Management

Rio de Janeiro, Brasil

V International Seminar on Remediation and Redevelopment of Contaminated Sites

5-7 November 2007


February 2003

PRESENTATION CONTENT

1. BACKGROUND

2. REDEVELOPMENT PLAN

3. ENVIRONMENTAL SCOPE1. SELLER2. BUYER

4. REMEDIATION PROGRAM

5. CONCLUSION


February 2003

BACKGROUND


February 2003

REDEVELOPMENT PLAN


February 2003

ENVIRONMENTAL SCOPE• ACTIONS BY PROPERTY SELLER

• More than 20 Years under U.S. EPA CERCLA Program• Coordination with Midvale City for redevelopment• Developed Risk-Based Remediation Framework to

Define Cleanup Requirements

• ACTIONS BY PROPERTY BUYER• Due Diligence (Phase I & II)• Prepare Soil Management Plan• Implement Remediation and Document Cleanup for

Agency


February 2003

ENVIRONMENTAL SCOPE• Industrial-Commercial – No Remediation Required

• Residential – Remedial Requirements• 12+ feet of clean cover – No cleanup required• 2-12 feet of cover:

• Goals: Max. Lead 975 mg/kg; Max. Arsenic 110 mg/kg• Sample frequency: 10 per 50 acres

• 0-2 feet of cover:• Goals: Max. Lead 650 mg/kg; Max. Arsenic 73 mg/kg• Sample frequency: 10 per 5 acres


February 2003

EPA DECISION FRAMEWORK

PRGs (no cover soil): As 73 mg/kg and Pb 650 mg/kg


February 2003

ENVIRONMENTAL SCOPE


February 2003

ENVIRONMENTAL SCOPESOIL MANAGEMENT PLAN

• Remove landfill debris

• Remove affected soil from residential areas to commercial areas to highest standard

• Perform quality assurance sampling to highest standard

• Document remedial action during work for agency review


February 2003

ENVIRONMENTAL SCOPE


February 2003

REMEDIATION


February 2003

REMEDIATIONCHALLENGES

• Work in wet areas

• Meeting geotechnical requirements

• Remediation vs redevelopment schedules

• Quality assurance samplingModified field approachCollected samples first – then excavated soil to required depthEmployed field XRF - confirmed by laboratory samples


February 2003

REMEDIATION


February 2003

REMEDIATIONREMEDIATION REPORT

• Site preparation and controls

• Monitoring well abandonment

• Historic Landfill Removal

• Supplemental Characterization Sampling

• Affected Soil Removal and Management

• Confirmation Sampling

• Air Monitoring and Sampling


February 2003

CONCLUSION


February 2003

CONCLUSIONPROJECT BENEFITS

• Environmental impacts mitigated for 130 acres

• Seller completes transaction after 20 years of Superfund

• Buyer achieves financial benefit via subdivision and resale

• EPA and UDEQ accept cleanup; preparing Certificate for Unrestricted Land Use

• Midvale City increases tax base

• New infill community developed


February 2003

ACKNOWLEDGEMENTSPROJECT TEAM MEMBERS

• Mercer Bingham Junction LLC - Developer

• Environmental Resources Management – Environmental Consultant

• Ensign Engineering – Civil Engineering and Permitting

• SWCA Engineering – Wetland Design Specialists

• GSH Consultants – Geotechnical Engineering

• Reynolds Brothers – General Contractor

• Holland and Hart – Real Estate and Environmental Counsel

• U.S. EPA and Utah DEQ – Environmental Agencies

• Midvale City – City Planning and Permitting

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