The Dow Chemical Company P.O. Box 8361 South Charleston, VW 25303‐8361 USA January 09, 2019 Ms. Gail Dieter New York State Department of Environmental Conservation Division of Environmental Remediation Bureau E, Section B 625 Broadway, 12th Floor Subject: 2018 Supplemental Building 4 Vapor Investigation at the Former Hampshire Chemical Corp. Facility, Waterloo, New York Site No. 850001A Dear Ms. Dieter: Hampshire Chemical Corp. (HCC) is pleased to submit one hard copy and one electronic copy of the 2018 Supplemental Building 4 Vapor Investigation at the Former Hampshire Chemical Corp. Facility, Waterloo, New York for Site No. 850001A. The Resource Conservation and Recovery Act (RCRA) facility investigation (RFI) and corrective measures activities were conducted pursuant to a Second Amended Order on Consent executed between Hampshire Chemical Corp. (HCC) and the NYSDEC under Index Number 8‐20000218‐3281, August 12, 2011. Please contact me at 304‐747‐7788 or Brian Carling at 610‐384‐0747 should you have any questions or require any additional information. Sincerely, Jerome E. Cibrik, P.G. Remediation Leader Copy To: Ms. Gail Dieter, NYSDEC Region 8 Ms. Bernadette Schilling, NYSDEC Region 8 (CD) Mr. Matthew Gillette, NYSDEC Region 8 (CD) Mr. Scott Foti, NYSDEC Region 8 (CD) Mr. Mark Sergott, NYSDOH (CD) Mr. Bart Putzig, NYSDEC Central Office (CD) Mr. Steve Brusso, Evans Chemetics LP (CD) Jacobs Project File TRANSMITTAL TO: Evans Chemetics FROM: Brian Carling 228 East Main Street, Jacobs Waterloo, NY 13165 26 Somerset Drive East Fallowfield, PA 19320 ATTN: Steve Brusso DATE: January 9, 2019 RE: 2018 Supplemental Building 4 Vapor Investigation at the Former Hampshire Chemical Corp. Facility, Waterloo, New York Site No. 850001A We Are Sending You: Method of Shipment: Attached FedEx 2-day Documents Drawings Under separate cover via Specifications Copies Other: Quantity Description 1 CD 2018 Supplemental Building 4 Vapor Investigation at the Former Hampshire Chemical Corp. Facility, Waterloo, New York Site No. 850001A If the material received is not as listed, please notify us at once. Copy To: Jerome Cibrik, HCC (CD) Ms. Gail Dieter, NYSDEC Region 8 Ms. Bernadette Schilling, NYSDEC Region 8 (CD) Mr. Matthew Gillette, NYSDEC Region 8 (CD) Mr. Scott Foti, NYSDEC Region 8 (CD) Mr. Mark Sergott, NYSDOH (CD) Mr. Bart Putzig, NYSDEC Central Office (CD) Jacobs Project File 1 TRANSMITTAL TO: The Dow Chemical Company FROM: Brian Carling P.O. Box 8361 Jacobs South Charleston, VW 25303‐8361 26 Somerset Drive East Fallowfield, PA 19320 ATTN: Jerome Cibrik DATE: January 9, 2019 RE: 2018 Supplemental Building 4 Vapor Investigation at the Former Hampshire Chemical Corp. Facility, Waterloo, New York Site No. 850001A We Are Sending You: Method of Shipment: Attached FedEx 2‐day Documents Drawings Under separate cover via Specifications Copies Other: Quantity Description 1 CD 2018 Supplemental Building 4 Vapor Investigation at the Former Hampshire Chemical Corp. Facility, Waterloo, New York Site No. 850001A If the material received is not as listed, please notify us at once. Copy To: Ms. Gail Dieter, NYSDEC Region 8 Ms. Bernadette Schilling, NYSDEC Region 8 (CD) Mr. Matthew Gillette, NYSDEC Region 8 (CD) Mr. Scott Foti, NYSDEC Region 8 (CD) Mr. Mark Sergott, NYSDOH (CD) Mr. Bart Putzig, NYSDEC Central Office (CD) Mr. Steve Brusso, Evans Chemetics LP (CD) Jacobs Project File 1 TRANSMITTAL TO: New York State Department of FROM: Brian Carling Environmental Conservation Jacobs Division of Environmental Remediation 26 Somerset Drive Bureau E, Section B East Fallowfield, PA 19320 625 Broadway, 12th Floor Albany, NY 12233-7017 ATTN: Gail Dieter DATE: January 9, 2019 RE: 2018 Supplemental Building 4 Vapor Investigation at the Former Hampshire Chemical Corp. Facility, Waterloo, New York Site No. 850001A We Are Sending You: Method of Shipment: Attached FedEx 2-day Documents Drawings Under separate cover via Specifications Copies Other: Quantity Description 1 hard copy, 2018 Supplemental Building 4 Vapor Investigation at the Former Hampshire Chemical Corp. Facility, 1 CD Waterloo, New York Site No. 850001A If the material received is not as listed, please notify us at once. Copy To: Jerome Cibrik, HCC (CD) Ms. Bernadette Schilling, NYSDEC Region 8 (CD) Mr. Matthew Gillette, NYSDEC Region 8 (CD) Mr. Scott Foti, NYSDEC Region 8 (CD) Mr. Mark Sergott, NYSDOH (CD) Mr. Bart Putzig, NYSDEC Central Office (CD) Mr. Steve Brusso, Evans Chemetics LP (CD) Jacobs Project File 1 TRANSMITTAL TO: New York State Department of Environmental FROM: Brian Carling Conservation Jacobs Division of Environmental Remediation 26 Somerset Drive Region 8 East Fallowfield, PA 19320 6274 East Avon- Lima Road Rte 5 & 20 Avon, NY 14414 ATTN: Scott Foti DATE: January 9, 2019 RE: 2018 Supplemental Building 4 Vapor Investigation at the Former Hampshire Chemical Corp. Facility, Waterloo, New York Site No. 850001A We Are Sending You: Method of Shipment: Attached FedEx 2-day Documents Drawings Under separate cover via Specifications Copies Other: Quantity Description 1 CD 2018 Supplemental Building 4 Vapor Investigation at the Former Hampshire Chemical Corp. Facility, Waterloo, New York Site No. 850001A If the material received is not as listed, please notify us at once. Copy To: Jerome Cibrik, HCC (CD) Ms. Gail Dieter, NYSDEC Region 8 Ms. Bernadette Schilling, NYSDEC Region 8 (CD) Mr. Matthew Gillette, NYSDEC Region 8 (CD) Mr. Mark Sergott, NYSDOH (CD) Mr. Bart Putzig, NYSDEC Central Office (CD) Mr. Steve Brusso, Evans Chemetics LP (CD) Jacobs Project File 1 TRANSMITTAL TO: New York State Department of Environmental FROM: Brian Carling Conservation Jacobs Division of Environmental Remediation 26 Somerset Drive Region 8 East Fallowfield, PA 19320 6274 East Avon- Lima Road Rte 5 & 20 Avon, NY 14414 ATTN: Matthew Gillette DATE: January 9, 2019 RE: 2018 Supplemental Building 4 Vapor Investigation at the Former Hampshire Chemical Corp. Facility, Waterloo, New York Site No. 850001A We Are Sending You: Method of Shipment: Attached FedEx 2-day Documents Drawings Under separate cover via Specifications Copies Other: Quantity Description 1 CD 2018 Supplemental Building 4 Vapor Investigation at the Former Hampshire Chemical Corp. Facility, Waterloo, New York Site No. 850001A If the material received is not as listed, please notify us at once. Copy To: Jerome Cibrik, HCC (CD) Ms. Gail Dieter, NYSDEC Region 8 Ms. Bernadette Schilling, NYSDEC Region 8 (CD) Mr. Scott Foti, NYSDEC Region 8 (CD) Mr. Mark Sergott, NYSDOH (CD) Mr. Bart Putzig, NYSDEC Central Office (CD) Mr. Steve Brusso, Evans Chemetics LP (CD) Jacobs Project File 1 TRANSMITTAL TO: New York State Department of FROM: Brian Carling Environmental Conservation Jacobs Division of Environmental Remediation 26 Somerset Drive Bureau E, Section B East Fallowfield, PA 19320 625 Broadway, 12th Floor Albany, NY 12233-7017 ATTN: Bernadette Schilling DATE: January 9, 2019 RE: 2018 Supplemental Building 4 Vapor Investigation at the Former Hampshire Chemical Corp. Facility, Waterloo, New York Site No. 850001A We Are Sending You: Method of Shipment: Attached FedEx 2-day Documents Drawings Under separate cover via Specifications Copies Other: Quantity Description 1 CD 2018 Supplemental Building 4 Vapor Investigation at the Former Hampshire Chemical Corp. Facility, Waterloo, New York Site No. 850001A If the material received is not as listed, please notify us at once. Copy To: Jerome Cibrik, HCC (CD) Ms. Gail Dieter, NYSDEC Region 8 Mr. Matthew Gillette, NYSDEC Region 8 (CD) Mr. Scott Foti, NYSDEC Region 8 (CD) Mr. Mark Sergott, NYSDOH (CD) Mr. Bart Putzig, NYSDEC Central Office (CD) Mr. Steve Brusso, Evans Chemetics LP (CD) Jacobs Project File 1 TRANSMITTAL TO: New York State Department of FROM: Brian Carling Environmental Conservation Jacobs Division of Environmental Remediation 26 Somerset Drive Bureau E, Section B East Fallowfield, PA 19320 625 Broadway, 12th Floor Albany, NY 12233-7017 ATTN: Mark Sergott DATE: January 9, 2019 RE: 2018 Supplemental Building 4 Vapor Investigation at the Former Hampshire Chemical Corp. Facility, Waterloo, New York Site No. 850001A We Are Sending You: Method of Shipment: Attached FedEx 2-day Documents Drawings Under separate cover via Specifications Copies Other: Quantity Description 1 CD 2018 Supplemental Building 4 Vapor Investigation at the Former Hampshire Chemical Corp. Facility, Waterloo, New York Site No. 850001A If the material received is not as listed, please notify us at once. Copy To: Jerome Cibrik, HCC (CD) Ms. Gail Dieter, NYSDEC Region 8 Ms. Bernadette Schilling, NYSDEC Region 8 (CD) Mr. Matthew Gillette, NYSDEC Region 8 (CD) Mr. Scott Foti, NYSDEC Region 8 (CD) Mr. Bart Putzig, NYSDEC Central Office (CD) Mr. Steve Brusso, Evans Chemetics LP (CD) Jacobs Project File 1 Memorandum 299 Madison Avenue Morristown, NJ 07960 www.jacobs.com Subject 2018 Supplemental Building 4 Vapor Investigation at the Former Hampshire Chemical Corp. Facility, Waterloo, New York Attention Former Hampshire Chemical Corp. From Jacobs Date January 9, 2019 Project Number 703077 1. Introduction This memorandum summarizes the methods, analytical results, and findings of a supplemental vapor investigation in Area of Concern (AOC) B (Building 4), AOC D (Building 3), and adjacent spaces at the former Hampshire Chemical Corp. (HCC), Waterloo, New York facility (site) conducted during May and June 2018. The vapor investigation described in this memorandum was performed to re-assess subslab and subsurface soil vapor results obtained during previous