Supplemental Remedial Investigation Work Plan - Parcel 6 - Supplemental Remedial Investigation Report

Sep 11, 2026

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Supplemental Remedial Investigation Work Plan for Parcel 6 at the K-Williamsburg Works site (Site ID 224055) in Brooklyn, New York. Prepared for National Grid under an Order on Consent, it expands delineation of the nature and extent of contamination by implementing additional site investigation activities. The plan references prior remedial investigation work, NYSDEC DER-10 Technical Guidance, and incorporates NYSDEC comments by focusing groundwater delineation through expanded investigation on Parcel 6. Appendices include health and safety, community air monitoring, field sampling, quality assurance, and remedial investigation figures.

LanguageEnglish

CategoryForms

FormatPDF

Pages665

Reading Time3 h 53 min

AccessFree to download

Executive Summary

1. Introduction

2. Scope of Work

2.1 Soil Borings

2.2 Monitoring Wells

2.3 Survey

2.4 Data Validation and Management

3. SRI Report Preparation

3.1 Supplemental Remedial Investigation Report

Schedule

References

Table

1. Sample Location Rationale

Figures

1. Site Location Map

2. Remedial Investigation Parcel Identification Map

Plate

1. Sample Locations

Appendices

A. Health and Safety Plan

B. Community Air Monitoring Plan

C. Field Sampling Plan

D. Quality Assurance Project Plan

E. Remedial Investigation Figures

GEI Consultants Consulting Engineers and Scientists # Supplemental Remedial InvestigationWork Plan -Parcel 6 Portion of K-Williamsburg WorksSite Brooklyn,New YorkIndex\#CO2-20200901-300Site ID:224055 Prepared for: The Brooklyn Union Gas Company d/b/a National Grid NY2 Hanson PlaceBrooklyn,NY11217 Prepared by: GEI Consultants,Inc.,P.C.455 Winding Brook DriveGlastonbury,CT 06033860-368-5300 February 2025 Project 093060-3.9 Melissa J.Felter,P.G.,LEPnuoaogetProject Manager J.0.Mc Matthew OXeil,P.E. Senior Engineer # Qualified Environmental Professional's Certification I,Melissa J.Felter,certify that I am currently a Qualified Environmental Professional asdefined in6NYCRR Part 375 and that this Supplemental Remedial Investigation Work Planwas prepared in accordance with applicable statutes and regulations and in substantialconformance with the DER Technical Guidance for Site Investigation and Remediation(DER-10). et hulwac February 21.2025 Date: Melissa J.Felter,P.G.,LEPGEI Consultants,Inc.,P.C. ## Table of Contents Executive Summary iv ### 1. Introduction 1 ### 2. Scope of Work 2.1 Soil Borings 5 2.2 Monitoring Wells 6 2.3 Survey 6 2.4 Data Validation and Management ### 3. SRI Report Preparation #### 3.1 Supplemental Remedial Investigation Report 4. 8 Schedule References 9 Table ### 1. Sample Location Rationale Figures 1. Site Location Map 2. Remedial Investigation Parcel Identification Map Plate 1. Sample Locations Appendices A. Health and Safety Plan B. Community Air Monitoring Plan C. Field Sampling Plan D. Quality Assurance Project Plan E. Remedial Investigation Figures MF/MO:bdpWgeiconsultants.comdata\Data_StorageWWorking\NATIONAL GRID093060-WLLIAMSBURG01_ADMINSRIWPIPaoel 6VDraft t NYSDEC 20250221Supplemental RIWP Parcel 6_2025-02-21.docx ## Executive Summary By way of an Order on Consent(Order)Index No.CO 2-20200910-300,The BrooklynUnion Gas Company d/b/a National Grid NY(National Grid),while preserving its rights toseek reimbursement from any responsible parties,has agreed to complete a supplementaldelineation of the nature and extent of contamination at,and which might be emanating fromthe K-Williamsburg Works site,site \#224055 in Brooklyn,Kings County,New York(the Site,Fig.1).Pursuant to that Order,National Grid has further agreed to implement thisSupplemental Remedial Investigation(SRI)Work Plan(SRIWP). Remedial investigation(RI)activities were previously performed in accordance with asuperseded Order on Consent and Administrative Settlement(AOC)Index No.A2-0552-0606 between New York State Department of Environmental Conservation(NYSDEC)and The Brooklyn Union Gas Company(BUG)d/b/a KeySpan Corporation andAOC Index No.CO 2-20200910-300 between NNYSDEC and BUG d/b/a National Grid NY,and they were conducted in accordance with the NYSDEC-approved Remedial InvestigationWork Plans(RIWPs).A draft RI Report was submitted to the NYSDEC October 2023(draftRI Report).For ease of discussion in the draft RI Report,the RI study area has been dividedinto six parcels identified as Parcels 1 through 6 as shown in the table below and in Fig.2. | Parcel ID | Address | Current Owner | Block | Lot | | --- | --- | --- | --- | --- | | Within Former Williamsburg Works MGP Footprint (i.e.,Within the Site) | | | | | | Parcel 1 | 35 Kent Avenue
Brooklyn,NY | North 12h Associates,
LLC | 2288 | 1 | | Parcel 2 | 50 Kent Avenue(aka 41
North 11th Street),Brooklyn,
NY _ | NYC Department of
Parks and Recreation
(NYCDPR) | 2287 | 1 | | Parcel 3 | 20 North 12th Street
Brooklyn,NY | NYCDPR | 2287 | 16 | | Parcel 4 |

FAQs

What is the purpose of the Supplemental Remedial Investigation Work Plan for Parcel 6?

It provides a supplemental approach to delineate the nature and extent of contamination associated with the K-Williamsburg Works site, with emphasis on activities needed for groundwater delineation on Parcel 6.

Why are additional wells on Parcel 6 included in the work plan?

NYSDEC comments on the draft supplemental RI work plan requested additional wells on Parcel 6, and the determination was made to address this in part through installing additional wells in the investigation area.

Who prepared the plan and under what regulatory guidance?

GEI Consultants, Inc. prepared the plan on behalf of National Grid, generally in accordance with NYSDEC DER-10 Technical Guidance for Site Characterization and Remedial Investigation (May 2010).

Sep 11, 2026

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