FINAL REMEDIAL DESIGN ADDENDUM

RINGWOOD MINES/LANDFILL SUPERFUND SITE

OPERABLE UNIT TWO

RINGWOOD, NEW JERSEY

EPA ID# NJD980529739

PREPARED FOR:

FORD MOTOR COMPANY

PREPARED BY:

CORNERSTONE ENVIRONMENTAL GROUP, LLC

100 CRYSTAL RUN ROAD, SUITE 101

MIDDLETOWN, NEW YORK 10941

October 2018

Ringwood OU2 Final RD Addendum 101818.docx\\tts625fs2\ceg2\PROJECTS\FORD MOTOR COMPANY\140802 - RINGWOOD MINES_LANDFILL SUPERFUND SITE\_Project Design\RD\RD Final Design\RD Final Design Report\Oct2018 Final RD Addendum\Ringwood OU2 Final RD Addendum 101818.docx

Certification

FINAL REMEDIAL DESIGN ADDENDUM

RINGWOOD MINES/LANDFILL SUPERFUND SITE

OPERABLE UNIT TWO

RINGWOOD, NEW JERSEY

The material and data in this Addendum were prepared under the supervision and

direction of the undersigned.

CORNERSTONE ENVIRONMENTAL GROUP, LLC

10/18/18 Gary J. DiPippo, Professional Engineer Date

NJ License No. 24GE02646100

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This Addendum addresses comments from the US Environmental Protection Agency (USEPA) provided in a letter dated May 11, 2018, on the Final Remedial Design for Operable Unit 2 (OU2) of the Ringwood Mines/Landfill Superfund Site remedial action.

The USEPA comments (shown in Italics) and responses (shown in standard font) are as follows:

1. The Interim Groundwater Monitoring Program proposed in the Remedial Design Report should be revised to provide for the sampling of the following wells:

Cannon Mine Pit Area — Wells OB-3 and RW-10Peters Mine Pit Area — Wells OB-19, RW-5, RW-14S and RW-14DSally's Pond Area — Wells OB-10, OB-29 and RW-12

The requested monitoring wells will be added to the Interim Groundwater Monitoring Program.

2. The schedule presented in Figure 7-1 of the Remedial Design Report should be revised to remove specific start and finish dates for each activity, given that the start date for the remedial action is currently unknown.

A revised Figure 7-1 is attached, with the specific dates removed.

In addition to the above, the New Jersey Department of Environmental Protection (NJDEP) issued a Flood Hazard Area (FHA) Individual Permit Equivalent and Verification (No. 1611-05-0006.7 FHA170001 & 170002) on March 6, 2018. A condition of this Permit Equivalent is to work with the NJDEP Mitigation Unit to finalize the mitigation proposal for disturbance to the riparian zone of Park Brook. Since the NJDEP issued the Permit Equivalent, Cornerstone Environmental Group, LLC (Cornerstone) on behalf of Ford Motor Company has worked with representatives of the NJDEP to revise the planting plan for riparian zone restoration. Specifically, the following summarizes the revisions made to the enclosed drawings from the OU2 Final Remedial Design (Drawings OCDA-4, WL-1, WL-2A, WL-3, and WL-4):

• Drawing OCDA-4 is revised for grading in the wetlands restoration area to incorporate open water areas per input from the NJDEP;

• Drawing WL-1 is revised to include a table of riparian zone disturbance and resource types;

• Drawing WL-2A is revised to include a table of riparian zone disturbance and restoration areas and to include open water areas in the OCDA to meet the NJDEP requirements for in-kind restoration of the PMP Area pond; and

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• Drawing WL-3 is revised to reflect differences in the various restoration areas to meet the NJDEP’s requirements for in-kind restoration. Also, Note 2 has been modified to allow shrub and tree planting up to the limit of the drainage swale in the PMP Area, and notes have been added for deed restricting the mitigation areas.

• Drawing WL-4 is revised to remove emergent and scrub/shrub wetland planting and substitute only forested wetland planting to meet the NJDEP’s requirements for in-kind restoration, notes have been added regarding NJDEP consultation at the time when final planting materials are known, herbivory protection/fencing details have been removed until final planting materials are known, and watering notes have been added.

ID Task Name Duration

1 Remedial Action Contracting 112 days

2 Prepare Request for Bids (Pre-Final Design) 22 days

3 Issue Request for Bids to Pre-Qualified Contractors 0 days

4 Pre-Bid Meeting 0 days

5 Contractor Bid Preparation and Receipt of Bids 45 days

6 Bid Evaluation and Contractor Selection 15 days

7 Remedial Action Contractor Award 30 days

8 Remedial Action Work Plan 112 days

9 USEPA Notification of Remedial Action Contractor (RAC) 30 days

10 Prepare and Submit Remedial Action Work Plan (RAWP) and Attachments (HASP, IQAT, ERP, FSP, QAPP, CQAPP, T&D Plan, etc)

35 days

11 USEPA Review of RAWP 22 days

12 Prepare Final RAWP 15 days

13 USEPA Approval of RAWP 10 days

14 O&M and Institutional Controls Plans 125 days

15 USEPA Review O&M and Institutional Controls Plans 45 days

16 Prepare Final O&M an dInstituional Controls Plans 15 days

17 USEPA Approval of O&M and Instituiional Controls Plans 22 days

18 Remedial Action Construction 525 days

19 USEPA Approval of Final Design Report and Notice to Proceed 0 days

20 Contractor Submittals 60 days

21 Contractor Mobilization 15 days

22 Pre-Construction Conference 0 days

23 Site Preparation and Installation of Soil Erosion & Sediment Control Measures35 days

24 Site Clearing and Grubbing 30 days

25 Excavation and Subgrade Stabilization (Incl. Dewatering as Needed)200 days

26 Transportation & Disposal, as necessary

27 Subgrade Fill 100 days

28 Final Cap Construction 100 days

29 Site Restoration and Vegetative Cover 30 days

30 Wetland Restoration at OCDA 65 days

31 Demobilization 20 days

32 Remedial Action Completion Inspection with USEPA 0 days

33 Remedial Action Report 60 days

M-6 M-5 M-4 M-3 M-2 M-1 M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M11 M12 M13 M14 M15 M16 M17 M18 M19 M20 M21 M22 M23 M24 M25 M26 M27 M28 M29

Task

Split

Milestone

Summary

Project Summary

External Tasks

External Milestone

Inactive Task

Inactive Milestone

Inactive Summary

Manual Task

Duration-only

Manual Summary Rollup

Manual Summary

Start-only

Finish-only

Deadline

Progress

Manual Progress

Figure 7-1, Preliminary Remedy Implementation Schedule

Ringwood Mines/Landfill Superfund Site, OU-2

October 2018

Page 1

See Final Remedial DesignReport for Discussion of BasisDate: Fri 10/19/18

A

-A

P

-1

B-B

P-1

C

-

C

P

-

1

FINAL GRADING PLAN - O'CONNOR DISPOSAL AREA

OCDA-4

LEGEND:

NOTES:

WETLANDS AND RIPARIAN ZONE

DISTURBANCE PLAN

WL-1

LEGEND:

NOTES:

WETLAND AND RIPARIAN ZONE DATA:

AREAS OF RIPARIAN ZONE DISTURBANCE AND RESOURCE TYPES

A

B

C

D

WETLANDS, RIPARIAN ZONE, AND SITE

RESTORATION/MITIGATION PLAN

WL-2A

NOTES:

WETLAND DATA:

RIPARIAN ZONE MITIGATION DATA:

RIPARIAN ZONE DISTURBANCE AND RESTORATION AREAS

LEGEND:

A

A

B

C

D

RESTORATION PLANTING PLAN

WL-3

LEGEND:

NOTES:

APPROXIMATE RESTORATION ACREAGE:

OCDA:

PMP:

MITIGATION:

®

”

METHODS AND MATERIALS:

“ ”

RESTORATION PLANTING PLAN NOTES AND DETAILS

WL-4