PROPOSED PLAN OF REMEDIAL Plans...¢  the suggested non-residential lead concentrations. Therefore, lead

  • View
    1

  • Download
    0

Embed Size (px)

Text of PROPOSED PLAN OF REMEDIAL Plans...¢  the suggested non-residential lead concentrations....

  • PROPOSED PLAN OF REMEDIAL ACTION

    615 South Church Street Site OU-1 Estate of William C. Ward Site

    Wilmington, Delaware DNREC Project No. DE-1272

    April 2018

    Delaware Department of Natural Resources and Environmental Control Division of Waste and Hazardous Substances

    Site Investigation & Restoration Section 391 Lukens Drive

    New Castle, Delaware 19720

    CONTENTS

    • Figures: 1 & 2 • Glossary of Terms

  • PROPOSED PLAN OF REMEDIAL ACTION

    Approval:

    615 South Church Street Site Operable Unit 1

    Estate of William C. Ward Site Wilmington, Delaware

    DNREC Project No. DE-1272

    This Proposed Plan meets the requirements of the Hazardous Substance Cleanup Act.

    thy tsep, Environmental rogram Administrator Site Investigation & Restoration Section

    Apt ~ 20/8 Date

    2

  • 3

    PROPOSED PLAN Questions & Answers

    615 South Church Street Site

    OU-1

    What is the Proposed Plan of Remedial Action? The Proposed Plan of Remedial Action (Proposed Plan) summarizes the clean-up (remedial) actions that are being proposed to address contamination found at the Site for public comment. A legal notice is published in the newspaper for a 20-day comment period. DNREC considers and addresses all public comments received and publishes a Final Plan of Remedial Action (Final Plan) for the Site. What is the 615 South Church Street Site, OU-1? The Site is approximately 6.3 acres and is identified as New Castle County tax parcel number 26-057.00-028. The Site is undeveloped and vacant. Groundcover generally consists of grass and moderate to dense woody vegetation. A parking lot and several trailers (associated with the facility on the southern adjacent property) are present on the southernmost portion of the property. The Site is bordered by an abandoned railroad bed and the 400 B Street property (wetlands) to the north and west, the 601 Garasches Lane (Owen Steel) property to the southwest, the 707 South Church Street (Industrial Resource Network, Inc.) and 701 Garasches Lane (Fibre Processing Corp.) properties to the south, the 801 Garasches Lane (Kuhn Construction) property to the southeast, the 800 South Church Street (vacant land) property to the east, and wetlands and residential dwellings (Wilmington Housing Authority) to the northeast. The wetlands present to the north and west are part of several properties totaling 24 acres collectively part of the planned South Wilmington Wetland Park Project and associated with DNREC SIRS Site DE-1500 (South Wilmington Stormwater Pilot). What happened at the 615 South Church Street Site? The Site has been extensively investigated, both on its own and as part of larger investigations. The results of those investigations conducted on the Site concluded that historic filling operations, specifically placement of ash residue from a nearby incinerator, as well as potential filling operations by others, have impacted Site soil and groundwater. Additional investigations were recurrently recommended to determine the degree of environmental impact and assess the need for remedial action on the Site. What is the environmental problem at the 615 South Church Street Site? A Remedial Investigation performed in 2017 at the Site found that contaminants were detected above the DNREC-SIRS Screening Levels in surface soil, subsurface soil, and groundwater. Contaminants of Concern (COCs) were identified in Site surface soil and groundwater. The calculated carcinogenic and non-carcinogenic risks are unacceptable for resident exposure to

  • 4

    COCs in surface soil (benz[a]anthracene, benzo[a]pyrene, benzo[b]fluoranthene, dibenz(a,h)anthracene, indeno[1,2,3 cd]pyrene, arsenic, cobalt, iron, and lead) and COCs in groundwater (dieldrin, cyanide, dissolved iron, and dissolved manganese). The carcinogenic risks are unacceptable for recreator exposure to benzo[a]pyrene, dibenz(a,h)anthracene, arsenic, and lead in surface soil. The carcinogenic and non-carcinogenic risk are acceptable for outdoor worker, excavation worker or trespasser scenarios, however, soil lead concentrations are above the suggested non-residential lead concentrations. Therefore, lead is the only COC under the outdoor worker, excavation worker, and trespasser scenarios. An exposure pathway to groundwater does not exist. Site users will not be residents. Remedial action objectives have been designed to prevent future Site recreators, outdoor workers, excavation workers, and trespassers from coming into contact with Site surface soil and to prevent any future Site users from creating pathways though which contact would be made with Site surface soil and/or groundwater. What clean-up actions have been taken at the 615 South Church Street Site? There have been no clean-up actions taken at the 615 South Church Street, OU1 Site. What does the owner want to do at the 615 South Church Street Site? The City of Wilmington intends to integrate the Site into the South Wilmington Wetland Park Project for use as an upland park area. Prior to construction of the upland park, the Site is planned to be used for staging and stockpiling of soil and sediment from Phase I of the South Wilmington Wetland Park project. What additional clean-up actions are needed at the 615 South Church Street Site? DNREC proposes the following remedial actions for the Site, which need to be completed before a Certificate of Completion of Remedy (COCR) can be issued.

    1. A Remedial Action Work Plan must be submitted to DNREC for approval within 60 days of the issuance of the Final Plan of Remedial Action.

    2. The Site must be capped with at least one foot of clean fill or impervious material (e.g. buildings, asphalt, or concrete) pursuant to the schedule indicated in the DNREC approved Remedial Action Work Plan.

    3. A proposed Environmental Covenant must be submitted to DNREC for approval within 60 days of the issuance of the approved Long Term Stewardship (LTS) Plan.

    4. An Environmental Covenant, consistent with Delaware’s Uniform Environmental Covenants Act (7 Del.C. Chapter 79, Subchapter II) must be recorded in the Office of the New Castle County Recorder of Deeds within 60 days of the issuance of the Long Term Stewardship Plan. The Environmental Covenant must include the following activity and/or use restrictions:

  • 5

    [a.] Use Restriction. Use of the Property shall be restricted solely to those non-residential type uses permitted within Commercial, Manufacturing, or Industrial Districts;

    [b.] Interference with Remedy. There shall be no digging, drilling, excavating, grading, constructing, earth moving, or any other land disturbing activities on the Property at depths greater than 1 foot without the prior written approval of DNREC;

    [c.] Limitation of Groundwater Withdrawal. No groundwater wells shall be installed and no groundwater shall be withdrawn from any well on the Property without the prior written approval of DNREC-SIRS and DNREC Division of Water;

    [d.] Compliance with the Long Term Stewardship Plan. All work required by the Long Term Stewardship Plan must be performed to DNREC’s satisfaction in accordance with the Plan; and

    [e.] Compliance with Contaminated Materials Management Plan. All work required by the Contaminated Materials Management Plan must be performed to DNREC’s satisfaction in accordance with the Plan.

    5. A Contaminated Materials Management Plan (CMMP) must be submitted to DNREC

    within 60 days of the issuance of the Final Plan of Remedial Action. The CMMP will provide guidance to enable construction workers to safely handle any potential contaminated soil and groundwater at the Site.

    6. The CMMP will be implemented upon its approval by DNREC.

    7. A Long-Term Stewardship Plan shall be submitted to DNREC for approval in accordance with the schedule set forth in the approved Remedial Action Work Plan. The LTS plan will detail the site-inspection schedule to be followed in order to ensure the long-term integrity of the remedy.

    8. The LTS Plan must be implemented within 60 days of its approval by DNREC.

    9. A Remedial Action Completion Report must be submitted to DNREC within 60 days of the completion of the remedial actions required in this Proposed Plan.

    10. A request for a Certification of Completion of Remedy (COCR) must be submitted to DNREC within 60 days of approval of the Remedial Action Completion Report.

    What are the long term plans for the Site after the cleanup? The Site is planned to be integrated into the South Wilmington Wetlands Area as an upland park.

  • 6

    How can I find additional information or comment on the Proposed Plan? The complete file on the Site including the Remedial Investigation Report and the various reports are available at the DNREC office, 391 Lukens Drive in New Castle, 19720. Most documents are also found on:

    http://www.nav.dnrec.delaware.gov/DEN3/ The 20-day public comment period begins on April 29, 2018 and ends at close of business (4:30 pm) on May 21, 2018. Please send written comments to the DNREC office at 391 Lukens Drive, New Castle, DE 19720 to Meghan Crystall, Project Officer or via email to Meghan.Crystall@state.de.us.

    Figure 1: Site Loc