Ross Bennett at (603) 668-0880

DES Waste Management Division 29 Hazen Drive; PO Box 95 Concord, NH 03302-0095

Work Plan for Sampling of Water Supply Wells and Provision of Alternate Water Addendum 4

Saint-Gobain Performance Plastics Facility 701 Daniel Webster Highway Merrimack, New Hampshire 03054 NHDES Site No.: 199712055 Project Number: 36430

Prepared for: Saint-Gobain Performance Plastics Corp. 14 McCaffrey Street Hoosick Falls, New York 12090 Phone Number: (518) 686-6268 RP Contact Name: Chris Angier RP Contact Email: [email protected]

Prepared By: Golder Associates Inc. 670 North Commercial Street Manchester, New Hampshire 03101 Phone Number: (603) 668-0880 Contact Name: Ross W. Bennett Contact Email: [email protected]

Date of Report: September 25, 2020

Cover Sheet for Reports Template - Revised January 2011

September 25, 2020 Project No. 2014-2270

Mr. Jeff Marts New Hampshire Department of Environmental Services Waste Management Division P.O. Box 95, 29 Hazen Drive Concord, New Hampshire 03302-0095

RE: WORK PLAN FOR SAMPLING OF WATER SUPPLY WELLS AND PROVISION OF ALTERNATE WATER - ADDENDUM 4 SAINT-GOBAIN PERFORMANCE PLASTICS 701 DANIEL WEBSTER HIGHWAY, MERRIMACK, NEW HAMPSHIRE NHDES SITE NO. 199712055

Dear Mr. Marts:

On behalf of Saint-Gobain Performance Plastics (SGPP), Golder Associates Inc. (Golder) is submitting this Addendum 4 to the New Hampshire Department of Environmental Services (NHDES) for work completed under the September 30, 2019 Work Plan for Sampling of Water Supply Wells and Provision of Alternate Water (September 2019 Work Plan, Golder, 2019a). Work Plan and Addenda Golder submitted the Work Plan for Sampling of Water Supply Wells and Provision of Alternate Water to NHDES on September 30, 2019 (September 2019 Work Plan, Golder, 2019a). In a letter dated October 3, 2019 (NHDES, 2019a), NHDES approved the sampling proposed in the September 2019 Work Plan and requested “a list of properties…for the next round of sampling that includes, but is not necessarily limited to, properties that are proximal to wells with PFOA concentrations that are above the AGQS of 12 ppt”.

In response to the October 3, 2019 NHDES request, Golder submitted the Work Plan for Sampling of Water Supply Wells and Provision of Alternate Water – Addendum 1 on November 1, 2019 (Work Plan Addendum 1, Golder, 2019b). In a letter dated November 5, 2019 (NHDES, 2019b) NHDES approved Work Plan Addendum 1 and requested:  Sampling of water supply wells at schools and licensed childcare facilities within the Outer Boundary.  Sampling or confirmation of water supply status of properties that were assumed to be connected to a public water supply and adjacent to properties that are eligible for alternate water.  Implementation of a dynamic strategy that continues to work to identify impacted water supply wells. Golder responded to these requests in the Work Plan for Sampling of Water Supply Wells and Provision of Alternate Water – Addendum 2 submitted to NHDES on December 16, 2019 (Work Plan Addendum 2, Golder, 2019c). In a letter dated December 17, 2019 (NHDES, 2019c) NHDES approved Work Plan Addendum 2 and requested sampling of school and childcare facilities connected to non-transient non-community public water supplies.

Golder submitted the Work Plan for Sampling of Water Supply Wells and Provision of Alternate Water – Addendum 3 to NHDES on January 6, 2020 (Work Plan Addendum 3, Golder, 2020a). NHDES approved Work Plan Addendum 3 in a letter dated January 7, 2020 (NHDES, 2020).

Golder Associates Inc. 670 North Commercial Street, Suite 103, Manchester, NH 03101 T: +1 603 668-0880 F: +1 603 668-1199

Golder and the G logo are trademarks of Golder Associates Corporation golder.com

Mr. Jeff Marts Project No. 2014-2270 New Hampshire Department of Environmental Services September 25, 2020

Identification of Wells for Sampling Golder used the following screening approach to identify properties for sampling or confirmation of water supply status under Addendum 4 as shown on Figures 1A through 1F and listed in Table 1:  Proximal Parcels: properties that are within a 60-foot offset of the boundary of properties that have been offered interim alternate water since submittal of Addendum 3.  Additional Parcels: select properties in areas adjacent to proximal parcels or in areas of relatively lower sample density

Figure 1 identifies properties as “connection to PWS confirmed” if the properties have been identified as connected to public water by public water suppliers. Starting with Addendum 4, Golder will not include properties identified as “connection to PWS confirmed” in the addendum for sampling or confirmation of water supply status because public water suppliers have identified that these properties are connected.

Properties within the Outer Boundary not currently identified for sampling under the 2019 Work Plan or associated addenda will be considered during the development of future addenda as described in Section 3.2 of the September 2019 Work Plan. Next Steps and Schedule Sampling and provision of alternate water at properties identified in the 2019 Work Plan and associated addenda will continue. SGPP will complete the following activities following NHDES approval of Work Plan Addendum 4:  Initiate contact with and provide access agreements to owners of properties identified for sampling within 30 days of Addendum approval.  Coordinate sampling of a property’s well(s) within 60 days of access agreement acceptance by the property owner(s).

The schedule for responding to results and reporting to NHDES is included in Section 5 of the September 2019 Work Plan.

If you have any questions regarding this Addendum, please call Mr. Ross Bennett at (603) 668-0880.

Sincerely,

Golder Associates Inc.

Alistair P.T. Macdonald, P.G., LSP Ross Bennett, P.E. Senior Program Leader and Principal Senior Consultant and Associate

APTM/RB:lrr https://golderassociates.sharepoint.com/sites/117234/project files/6 deliverables/00 - work plan and addenda/11 - addendum 4/2020-09-25 res well wp addendum 4.docx

Attachments:

Table 1 – Properties Identified for Potential Sampling – Addendum 4 Figures 1A through 1F – Properties Identified for Potential Sampling – Addendum 4

Mr. Jeff Marts Project No. 2014-2270 New Hampshire Department of Environmental Services September 25, 2020

References: Golder, 2019a. Work Plan for Sampling of Water Supply Wells and Provision of Alternate Water. September 30, 2019.

Golder, 2019b. Work Plan for Sampling of Water Supply Wells and Provision of Alternate Water – Addendum 1. November 1, 2019.

Golder, 2019c. Work Plan for Sampling of Water Supply Wells and Provision of Alternate Water – Addendum 2. December 16, 2019.

Golder, 2020. Work Plan for Sampling of Water Supply Wells and Provision of Alternate Water – Addendum 3. January 6, 2020.

NHDES, 2019a. Re: Work Plan for Sampling of Water Supply Wells and Provision of Alternate Water. October 3, 2019.

NHDES, 2019b. Re: Work Plan for Sampling of Water Supply Wells and Provision of Alternate Water – Addendum 1. November 5, 2019.

NHDES, 2019c. Re: Work Plan for Sampling of Water Supply Wells and Provision of Alternate Water – Addendum 2. December 17, 2019.

NHDES, 2020. Re: Work Plan for Sampling of Water Supply Wells and Provision of Alternate Water – Addendum 3. January 7, 2020.

September 2020 Project Number: 2014-2270

Table 1: Properties Identified for Potential Sampling - Addendum 4 Work Plan for Sampling of Water Supply Wells and Provision of Alternate Water

ADDRESS Likely Likely Not LOCATION ID TOWN STREET MAP BLOCK LOT SLUC STREET NAME Developed Developed NUMBER RWS-04001 Bedford 12 APPLEDOR RD 26 14 29 11 X RWS-04002 Bedford 17 APPLEDOR RD 26 14 22 11 X RWS-04003 Bedford 20 APPLEDOR RD 26 14 24 11 X RWS-04004 Bedford 23 APPLEDOR RD 26 14 21 11 X RWS-04005 Bedford 24 APPLEDOR RD 26 14 20 11 X RWS-04006 Bedford 7 APPLELEAF DR 26 14 26 11 X RWS-04007 Bedford APPLELEAF DR 26 14 19 22 X RWS-04008 Bedford APPLELEAF DR 26 14 25 22 X RWS-04009 Bedford 33 BACK RIVER RD 22 43 2 11 X RWS-04010 Bedford 34 BACK RIVER RD 22 39 3 11 X RWS-04011 Bedford 16 CAMELOT DR 26 5 50 11 X RWS-04012 Bedford 54 CAMELOT DR 26 5 45 11 X RWS-04013 Bedford 55 CAMELOT DR 26 5 23 11 X RWS-04014 Bedford 84 CAMELOT DR 26 5 38 11 X RWS-04015 Bedford 92 CAMELOT DR 26 5 36 11 X RWS-04016 Bedford 15 CHECKERBERRY LN 38 4 40 11 X RWS-04017 Bedford 17 CHECKERBERRY LN 38 4 44 11 X RWS-04018 Bedford 3 COBBLER LN 21 29 3 11 X RWS-04019 Bedford 5 COBBLER LN 21 29 4 11 X RWS-04020 Bedford 12 COBBLER LN 21 29 6 11 X RWS-04021 Bedford 21 EDINBURGH DR 21 27 74 11 X RWS-04022 Bedford 10 GAGE RD 33 21 1 11 X RWS-04023 Bedford 20 GAGE RD 33 20 3 11 X RWS-04024 Bedford 4 HEATHER DR 25 35 5 11 X RWS-04025 Bedford 37 HIGHLAND FARMS DR 26 6 29 11 X RWS-04026 Bedford 40 HIGHLAND FARMS DR 26 6 52 11 X RWS-04027 Bedford 41 HIGHLAND FARMS DR 26 6 30 11 X RWS-04028 Bedford 45 HIGHLAND FARMS DR 26 6 31 11 X RWS-04029 Bedford 54 HIGHLAND FARMS DR 26 6 58 11 X RWS-04030 Bedford 18 KAROLINA LN 25 60 9 11 X RWS-04031 Bedford 38 LEDGEWOOD RD 27 50 9 11 X RWS-04032 Bedford 242 LIBERTY HILL RD 33 10 0 11 X RWS-04033 Bedford 255 LIBERTY HILL RD 33 17 20 11 X RWS-04034 Bedford 283 LIBERTY HILL RD 33 24 0 11 X RWS-04035 Bedford 287 LIBERTY HILL RD 38 15 1 11 X RWS-04036 Bedford 291 LIBERTY HILL RD 38 15 2 11 X RWS-04037 Bedford 296 LIBERTY HILL RD 38 5 1 11 X RWS-04038 Bedford LIBERTY HILL RD 33 21 0 22 X RWS-04039 Bedford LIBERTY HILL RD 38 10 0 57 X RWS-04040 Bedford LIBERTY HILL RD 38 9 0 57 X RWS-04041 Bedford 14 MEADOW RD 38 16 0 11 X RWS-04042 Bedford 21 MEADOW RD 33 20 9 11 X RWS-04043 Bedford 17 MULBERRY LN 25 96 19 11 X RWS-04044 Bedford 21 MULBERRY LN 25 96 18 11 X RWS-04045 Bedford 22 MULBERRY LN 25 96 4 11 X RWS-04046 Bedford 24 MULBERRY LN 25 96 5 11 X RWS-04047 Bedford 45 OLD SAWMILL RD 26 6 49 11 X RWS-04048 Bedford 49 OLD SAWMILL RD 26 6 50 11 X RWS-04049 Bedford 50 OLD SAWMILL RD 26 6 34 11 X RWS-04050 Bedford OLD SAWMILL RD 26 6 57 27 X RWS-04051 Bedford 31 OLDE ENGLISH RD 33 46 19 11 X RWS-04052 Bedford 5 SEBBINS POND DR 25 57 4 11 X RWS-04053 Bedford 8 SEBBINS POND DR 25 34 0 11 X RWS-04054 Bedford 19 SEBBINS POND DR 25 55 0 11 X RWS-04055 Bedford 39 SEBBINS POND DR 25 54 4 11 X RWS-04056 Bedford 44 SEBBINS POND DR 25 37 6 11 X RWS-04057 Bedford 50 SEBBINS POND DR 25 37 9 11 X RWS-04058 Bedford 27 SHAW DR 13 13 19 11 X RWS-04059 Bedford 25 TIRRELL RD 26 1 0 11 X RWS-04060 Bedford 20 WEYMOUTH DR 31 1 19 11 X RWS-04061 Litchfield 8 BUTTONBUSH LANE 14 0 85 11 X RWS-04062 Litchfield 8 COLONIAL DRIVE 16 0 57 60 Unknown Unknown RWS-04063 Litchfield BL89 COLONIAL DRIVE 16 0 7 22 X RWS-04064 Litchfield 10 DEERWOOD DRIVE 16 0 49 11 X RWS-04065 Litchfield 32 DEERWOOD DRIVE 14 0 80 11 X RWS-04066 Litchfield 34 DEERWOOD DRIVE 14 0 78 11 X RWS-04067 Litchfield 36 DEERWOOD DRIVE 14 0 76 11 X RWS-04068 Litchfield 31 GREENWICH ROAD 13 0 111 11 X RWS-04069 Litchfield 48 HILLCREST ROAD 14 0 177 11 X RWS-04070 Litchfield 66 HILLCREST ROAD 13 0 44 11 X RWS-04071 Litchfield 72 HILLCREST ROAD 13 0 43 11 X RWS-04072 Litchfield 73 HILLCREST ROAD 13 0 42 12 X RWS-04073 Litchfield 78 HILLCREST ROAD 13 0 41 11 X RWS-04074 Litchfield 87 HILLCREST ROAD 16 0 5 12 X RWS-04075 Litchfield 90 HILLCREST ROAD 16 0 4 11 X

1 of 5 September 2020 Project Number: 2014-2270

Table 1: Properties Identified for Potential Sampling - Addendum 4 Work Plan for Sampling of Water Supply Wells and Provision of Alternate Water

ADDRESS Likely Likely Not LOCATION ID TOWN STREET MAP BLOCK LOT SLUC STREET NAME Developed Developed NUMBER RWS-04076 Litchfield 91 HILLCREST ROAD 16 0 25 11 X RWS-04077 Litchfield 93 HILLCREST ROAD 16 0 27 11 X RWS-04078 Litchfield 13 MEADOWBROOK LANE 13 0 32 11 X RWS-04079 Litchfield 3 MUSCOVY DRIVE 13 0 46 11 X RWS-04080 Litchfield 4 MUSCOVY DRIVE 13 0 47 11 X RWS-04081 Litchfield 5 MUSCOVY DRIVE 13 0 48 11 X RWS-04082 Litchfield 8 MUSCOVY DRIVE 13 0 53 11 X RWS-04083 Litchfield 9 MUSCOVY DRIVE 13 0 52 11 X RWS-04084 Litchfield 10 MUSCOVY DRIVE 13 0 115 11 X RWS-04085 Litchfield 11 MUSCOVY DRIVE 13 0 112 11 X RWS-04086 Litchfield 15 MUSCOVY DRIVE 13 0 113 11 X RWS-04087 Litchfield 17 MUSCOVY DRIVE 13 0 114 11 X RWS-04088 Litchfield BL13 MUSCOVY DRIVE 13 0 51 27 X RWS-04089 Litchfield 70 PINECREST ROAD 13 0 26 22 X RWS-04090 Litchfield 72 PINECREST ROAD 13 0 26 12 X RWS-04091 Litchfield 76 PINECREST ROAD 13 0 24 12 X RWS-04092 Litchfield 94 PINECREST ROAD 13 0 20 22 X RWS-04093 Litchfield 4 SHIRLEY WAY 16 0 10 11 X RWS-04094 Litchfield 6 SHIRLEY WAY 16 0 12 11 X RWS-04095 Litchfield 8 SHIRLEY WAY 16 0 14 11 X RWS-04096 Litchfield 17 WINDSOR DRIVE 13 0 168 11 X RWS-04097 Londonderry 39 ALEXANDER RD 11 60 1 11 X RWS-04098 Londonderry 40 ALEXANDER RD 11 77 1 11 X RWS-04099 Londonderry 46 ALEXANDER RD 11 59 3 11 X RWS-04100 Londonderry 47 ALEXANDER RD 11 58 3 11 X RWS-04101 Londonderry 48 ALEXANDER RD 11 55 9 11 X RWS-04102 Londonderry 51 ALEXANDER RD 11 58 4 11 X RWS-04103 Londonderry 52 ALEXANDER RD 11 55 8 11 X RWS-04104 Londonderry 54 ALEXANDER RD 11 55 11 11 X RWS-04105 Londonderry 55 ALEXANDER RD 11 58 5 11 X RWS-04106 Londonderry 58 ALEXANDER RD 11 55 7 11 X RWS-04107 Londonderry 59 ALEXANDER RD 11 58 7 11 X RWS-04108 Londonderry 60 ALEXANDER RD 11 55 6 11 X RWS-04109 Londonderry 61 ALEXANDER RD 11 58 8 35 X RWS-04110 Londonderry 62 ALEXANDER RD 11 55 5 11 X RWS-04111 Londonderry 63 ALEXANDER RD 11 58 9 11 X RWS-04112 Londonderry 64 ALEXANDER RD 11 55 4 11 X RWS-04113 Londonderry 65 ALEXANDER RD 11 58 10 11 X RWS-04114 Londonderry 71 ALEXANDER RD 11 52 0 11 X RWS-04115 Londonderry 9 ANTHONY DR 5 52 15 11 X RWS-04116 Londonderry 12 ANTHONY DR 5 52 16 11 X RWS-04117 Londonderry 13 ANTHONY DR 5 52 33 11 X RWS-04118 Londonderry 35 ANTHONY DR 5 48 10 11 X RWS-04119 Londonderry 40 ANTHONY DR 5 48 15 11 X RWS-04120 Londonderry 3 BERLANG RD 5 58 12 11 X RWS-04121 Londonderry 4 BERLANG RD 5 58 19 11 X RWS-04122 Londonderry 7 BERLANG RD 5 58 14 11 X RWS-04123 Londonderry 10 BERLANG RD 5 58 16 11 X RWS-04124 Londonderry 1 BOUNDARY DR 8 9 9 11 X RWS-04125 Londonderry 4 BOUNDARY DR 8 9 8 11 X RWS-04126 Londonderry 22 CHANDLER DR 5 31 34 11 X RWS-04127 Londonderry 23 CHANDLER DR 5 31 15 11 X RWS-04128 Londonderry 24 CHANDLER DR 5 31 33 11 X RWS-04129 Londonderry 1 CHESTNUT HILL DR 8 6 41 11 X RWS-04130 Londonderry 2 CHESTNUT HILL DR 8 6 73 11 X RWS-04131 Londonderry 3 CHESTNUT HILL DR 8 6 42 11 X RWS-04132 Londonderry 5 CHESTNUT HILL DR 8 6 43 11 X RWS-04133 Londonderry 7 CHESTNUT HILL DR 8 6 44 11 X RWS-04134 Londonderry 8 CHESTNUT HILL DR 8 6 76 11 X RWS-04135 Londonderry 9 CHESTNUT HILL DR 8 6 45 11 X RWS-04136 Londonderry 17 CHESTNUT HILL DR 8 6 49 11 X RWS-04137 Londonderry 19 CHESTNUT HILL DR 8 6 50 11 X RWS-04138 Londonderry 21 CHESTNUT HILL DR 8 6 51 11 X RWS-04139 Londonderry 3 COLONIAL DR 5 18 2 11 X RWS-04140 Londonderry 4 COLONIAL DR 5 18 10 11 X RWS-04141 Londonderry 17 COLONIAL DR 5 19 3 11 X RWS-04142 Londonderry 18 COLONIAL DR 5 19 27 11 X RWS-04143 Londonderry 19 COLONIAL DR 5 19 4 11 X RWS-04144 Londonderry 20 COLONIAL DR 5 19 26 11 X RWS-04145 Londonderry 21 COLONIAL DR 5 19 5 11 X RWS-04146 Londonderry 30 COLONIAL DR 5 19 21 11 X RWS-04147 Londonderry 37 COLONIAL DR 5 19 13 11 X RWS-04148 Londonderry 39 COLONIAL DR 5 19 19 11 X RWS-04149 Londonderry 8A COLUMBIA DR 11 059C 10A 11 X RWS-04150 Londonderry 2 ELWOOD RD 5 46 2 11 X

2 of 5 September 2020 Project Number: 2014-2270

Table 1: Properties Identified for Potential Sampling - Addendum 4 Work Plan for Sampling of Water Supply Wells and Provision of Alternate Water

ADDRESS Likely Likely Not LOCATION ID TOWN STREET MAP BLOCK LOT SLUC STREET NAME Developed Developed NUMBER RWS-04151 Londonderry 5 ELWOOD RD 5 38 10 11 X RWS-04152 Londonderry 24 ELWOOD RD 5 43 0 11 X RWS-04153 Londonderry 26 ELWOOD RD 5 43 1 11 X RWS-04154 Londonderry 3 FAIRWAY RD 11 58 37 11 X RWS-04155 Londonderry 4 FAIRWAY RD 11 58 57 11 X RWS-04156 Londonderry 5 FAIRWAY RD 11 58 38 11 X RWS-04157 Londonderry 9 FAIRWAY RD 11 58 40 11 X RWS-04158 Londonderry 11 FAIRWAY RD 11 58 41 11 X RWS-04159 Londonderry 14 FAIRWAY RD 11 58 53 11 X RWS-04160 Londonderry 17 FAIRWAY RD 11 58 74 11 X RWS-04161 Londonderry 19 FAIRWAY RD 11 58 75 11 X RWS-04162 Londonderry 20 FAIRWAY RD 11 58 81 11 X RWS-04163 Londonderry 22 FAIRWAY RD 11 58 80 11 X RWS-04164 Londonderry 23 FAIRWAY RD 11 58 76 11 X RWS-04165 Londonderry 24A FAIRWAY RD 11 058C 0 11 X RWS-04166 Londonderry 24B FAIRWAY RD 11 058C 79C 11 X RWS-04167 Londonderry 25A FAIRWAY RD 11 058C 0 11 X RWS-04168 Londonderry 25B FAIRWAY RD 11 058C 0 11 X RWS-04169 Londonderry 26A FAIRWAY RD 11 058C 0 11 X RWS-04170 Londonderry 26B FAIRWAY RD 11 058C 0 11 X RWS-04171 Londonderry 3 HARVEY RD 11 26 10 11 X RWS-04172 Londonderry 5 HARVEY RD 11 94 0 12 X RWS-04173 Londonderry 7 HARVEY RD 11 96 0 11 X RWS-04174 Londonderry 2 HAWTHORNE RD 5 48 17 11 X RWS-04175 Londonderry 4 HAWTHORNE RD 5 48 18 11 X RWS-04176 Londonderry 6 HAWTHORNE RD 5 48 19 11 X RWS-04177 Londonderry 4 HICKORY HILL DR 8 6 56 11 X RWS-04178 Londonderry 6 HICKORY HILL DR 8 6 55 11 X RWS-04179 Londonderry 8 HICKORY HILL DR 8 6 54 11 X RWS-04180 Londonderry 10 HICKORY HILL DR 8 6 53 11 X RWS-04181 Londonderry 12 HICKORY HILL DR 8 6 52 11 X RWS-04182 Londonderry 25 HIGH RANGE RD 2 1 1 11 X RWS-04183 Londonderry 55 HIGH RANGE RD 5 49 0 57 X RWS-04184 Londonderry 97 HIGH RANGE RD 5 30 3 11 X RWS-04185 Londonderry 155 HIGH RANGE RD 8 2 43863 11 X RWS-04186 Londonderry 163 HIGH RANGE RD 8 002A 1 25 X RWS-04187 Londonderry 165 HIGH RANGE RD 8 002A 0 11 X RWS-04188 Londonderry 167 HIGH RANGE RD 8 002A 2 25 X RWS-04189 Londonderry 169 HIGH RANGE RD 8 3 1 11 X RWS-04190 Londonderry 171 HIGH RANGE RD 8 3 2 25 X RWS-04191 Londonderry 175 HIGH RANGE RD 8 3 3 11 X RWS-04192 Londonderry 185 HIGH RANGE RD 8 6 23 11 X RWS-04193 Londonderry 187 HIGH RANGE RD 8 6 22 11 X RWS-04194 Londonderry 189 HIGH RANGE RD 8 6 21 11 X RWS-04195 Londonderry 193 HIGH RANGE RD 8 6 20 11 X RWS-04196 Londonderry 195 HIGH RANGE RD 8 6 19 11 X RWS-04197 Londonderry 197 HIGH RANGE RD 8 6 18 11 X RWS-04198 Londonderry 199 HIGH RANGE RD 8 6 17 11 X RWS-04199 Londonderry 207 HIGH RANGE RD 8 6 13 11 X RWS-04200 Londonderry 213 HIGH RANGE RD 8 6 11 11 X RWS-04201 Londonderry 227 HIGH RANGE RD 8 24 0 57 X RWS-04202 Londonderry 229 HIGH RANGE RD 8 6 7 11 X RWS-04203 Londonderry 231 HIGH RANGE RD 8 6 6 11 X RWS-04204 Londonderry 251 HIGH RANGE RD 11 67 0 11 X RWS-04205 Londonderry 257 HIGH RANGE RD 11 65 0 11 X RWS-04206 Londonderry 259 HIGH RANGE RD 11 64 0 11 X RWS-04207 Londonderry 12 IMPERIAL DR 8 3 52B 22 X RWS-04208 Londonderry 16 JEWEL CT 8 3 0 57 X RWS-04209 Londonderry 1 JUSTIN CR 11 58 82 25 X RWS-04210 Londonderry 2 JUSTIN CR 11 58 6 11 X RWS-04211 Londonderry 3 JUSTIN CR 11 58 11 11 X RWS-04212 Londonderry 4 JUSTIN CR 11 58 35 11 X RWS-04213 Londonderry 5 JUSTIN CR 11 58 12 11 X RWS-04214 Londonderry 8 JUSTIN CR 11 58 26 11 X RWS-04215 Londonderry 10 JUSTIN CR 11 58 25 11 X RWS-04216 Londonderry 12 JUSTIN CR 11 58 24 11 X RWS-04217 Londonderry 14 JUSTIN CR 11 58 23 11 X RWS-04218 Londonderry 20 JUSTIN CR 11 58 20 11 X RWS-04219 Londonderry 22 JUSTIN CR 11 58 19 11 X RWS-04220 Londonderry 24 JUSTIN CR 11 58 18 11 X RWS-04221 Londonderry 26 JUSTIN CR 11 58 17 11 X RWS-04222 Londonderry 15 KIMBALL RD 11 30 0 11 X RWS-04223 Londonderry 36 KIMBALL RD 11 57 0 11 X RWS-04224 Londonderry 39 KIMBALL RD 11 56 2 17 X RWS-04225 Londonderry 56 KIMBALL RD 11 49 0 57 X

3 of 5 September 2020 Project Number: 2014-2270

Table 1: Properties Identified for Potential Sampling - Addendum 4 Work Plan for Sampling of Water Supply Wells and Provision of Alternate Water

ADDRESS Likely Likely Not LOCATION ID TOWN STREET MAP BLOCK LOT SLUC STREET NAME Developed Developed NUMBER RWS-04226 Londonderry 63 KIMBALL RD 11 55 12 11 X RWS-04227 Londonderry 123 LITCHFIELD RD 11 22 1 12 X RWS-04228 Londonderry 191 LITCHFIELD RD 11 2 0 35 X RWS-04229 Londonderry 125A LITCHFIELD RD 11 022C A 11 X RWS-04230 Londonderry 125B LITCHFIELD RD 11 022C B 11 X RWS-04231 Londonderry 5 LORRAINE DR 5 50 29 11 X RWS-04232 Londonderry 7 LORRAINE DR 5 50 28 11 X RWS-04233 Londonderry 5 MAUREEN CR 11 26 43834 11 X RWS-04234 Londonderry 6 MAUREEN CR 11 26 43837 11 X RWS-04235 Londonderry 7 MAUREEN CR 11 26 43835 11 X RWS-04236 Londonderry 8 MAUREEN CR 11 26 43836 11 X RWS-04237 Londonderry 9 MAUREEN CR 11 96 2 11 X RWS-04238 Londonderry 10 MAUREEN CR 11 96 1 11 X RWS-04239 Londonderry 4 MAYFLOWER DR 8 6 64 11 X RWS-04240 Londonderry 6 MAYFLOWER DR 8 6 65 11 X RWS-04241 Londonderry 8 MAYFLOWER DR 8 6 66 11 X RWS-04242 Londonderry 23 MAYFLOWER DR 8 6 37 11 X RWS-04243 Londonderry 29 MAYFLOWER DR 8 6 39 11 X RWS-04244 Londonderry 31 MAYFLOWER DR 8 6 40 11 X RWS-04245 Londonderry 4 MONT VERNON DR 5 73 11 11 X RWS-04246 Londonderry 7 MONT VERNON DR 5 73 16 11 X RWS-04247 Londonderry 5 MORWAY DR 5 4 15 11 X RWS-04248 Londonderry 7 MORWAY DR 5 4 14 11 X RWS-04249 Londonderry 9 MORWAY DR 5 4 13 11 X RWS-04250 Londonderry 1 PATRIOT WY 5 20 0 11 X RWS-04251 Londonderry 2 PATRIOT WY 5 20 1 25 X RWS-04252 Londonderry 5 PINE HOLLOW DR 8 9 31 11 X RWS-04253 Londonderry 7 PINE HOLLOW DR 8 9 30 11 X RWS-04254 Londonderry 8 PINE HOLLOW DR 8 9 37 11 X RWS-04255 Londonderry 10 PINE HOLLOW DR 8 9 38 11 X RWS-04256 Londonderry 12 PINE HOLLOW DR 8 9 39 11 X RWS-04257 Londonderry 14 PINE HOLLOW DR 8 9 40 11 X RWS-04258 Londonderry 23 PINE HOLLOW DR 8 9 17 11 X RWS-04259 Londonderry 25 PINE HOLLOW DR 8 9 16 11 X RWS-04260 Londonderry 3 POPLAR CR 8 6 82 11 X RWS-04261 Londonderry 4 POPLAR CR 8 6 63 11 X RWS-04262 Londonderry 6 POPLAR CR 8 6 62 11 X RWS-04263 Londonderry 8 POPLAR CR 8 6 61 11 X RWS-04264 Londonderry 12 PREMIER DR 5 49 37 11 X RWS-04265 Londonderry 13 PREMIER DR 5 49 44 11 X RWS-04266 Londonderry 16 PREMIER DR 5 49 39 11 X RWS-04267 Londonderry 24 PRISCILLA LN 2 49 6 11 X RWS-04268 Londonderry 7 QUINCY RD 5 002C 8B 14 X RWS-04269 Londonderry 8 QUINCY RD 5 002C 11A 14 X RWS-04270 Londonderry 8 QUINCY RD 5 002C 11B 14 X RWS-04271 Londonderry 7 RAINTREE DR 8 3 52C 22 X RWS-04272 Londonderry 5 ROCKWOOD LN 5 49 7 11 X RWS-04273 Londonderry 13 ROLLING RIDGE RD 8 9 15 11 X RWS-04274 Londonderry 14 ROLLING RIDGE RD 8 9 7 11 X RWS-04275 Londonderry 15 ROLLING RIDGE RD 8 9 14 11 X RWS-04276 Londonderry 17 ROLLING RIDGE RD 8 9 13 11 X RWS-04277 Londonderry 18 ROLLING RIDGE RD 8 9 10 11 X RWS-04278 Londonderry 19 ROLLING RIDGE RD 8 9 12 11 X RWS-04279 Londonderry 20 ROLLING RIDGE RD 8 9 11 11 X RWS-04280 Londonderry 21 ROLLING RIDGE RD 11 58 44 11 X RWS-04281 Londonderry 22 ROLLING RIDGE RD 11 58 43 11 X RWS-04282 Londonderry 23 ROLLING RIDGE RD 11 58 45 11 X RWS-04283 Londonderry 25 ROLLING RIDGE RD 11 58 46 11 X RWS-04284 Londonderry 27 ROLLING RIDGE RD 11 58 59 11 X RWS-04285 Londonderry 28 ROLLING RIDGE RD 11 58 73 11 X RWS-04286 Londonderry 29 ROLLING RIDGE RD 11 58 60 11 X RWS-04287 Londonderry 31 ROLLING RIDGE RD 11 58 61 11 X RWS-04288 Londonderry 35 ROLLING RIDGE RD 11 58 63 11 X RWS-04289 Londonderry 38 ROLLING RIDGE RD 11 58 68 11 X RWS-04290 Londonderry 49 ROLLING RIDGE RD 11 48 1 57 X RWS-04291 Londonderry 49 ROLLING RIDGE RD 11 50 0 57 X RWS-04292 Londonderry ROLLING RIDGE RD 8 11 0 57 X RWS-04293 Londonderry 8 ROYAL LN 8 2 11 11 X RWS-04294 Londonderry 9 ROYAL LN 8 2 12 11 X RWS-04295 Londonderry 10 ROYAL LN 8 2 13 11 X RWS-04296 Londonderry 11 ROYAL LN 8 2 14 11 X RWS-04297 Londonderry 14 ROYAL LN 8 2 17 11 X RWS-04298 Londonderry 16 ROYAL LN 8 2 19 11 X RWS-04299 Londonderry 18 ROYAL LN 8 2 21 11 X RWS-04300 Londonderry 20 ROYAL LN 8 2 23 11 X

4 of 5 September 2020 Project Number: 2014-2270

Table 1: Properties Identified for Potential Sampling - Addendum 4 Work Plan for Sampling of Water Supply Wells and Provision of Alternate Water

ADDRESS Likely Likely Not LOCATION ID TOWN STREET MAP BLOCK LOT SLUC STREET NAME Developed Developed NUMBER RWS-04301 Londonderry 22 ROYAL LN 8 2 25 11 X RWS-04302 Londonderry 24 ROYAL LN 8 2 0 11 X RWS-04303 Londonderry 38 ROYAL LN 8 23 10 11 X RWS-04304 Londonderry 43 ROYAL LN 8 23 9 11 X RWS-04305 Londonderry 2 SARA BETH LN 11 58 92 11 X RWS-04306 Londonderry 3 SARA BETH LN 11 58 90 11 X RWS-04307 Londonderry 4 SARA BETH LN 11 58 83 11 X RWS-04308 Londonderry 5 SARA BETH LN 11 58 89 11 X RWS-04309 Londonderry 6 SARA BETH LN 11 58 84 11 X RWS-04310 Londonderry 8 SARA BETH LN 11 58 85 11 X RWS-04311 Londonderry 9 SARA BETH LN 11 58 87 11 X RWS-04312 Londonderry 20 SEVERANCE DR 2 4 12 11 X RWS-04313 Londonderry 3 SHADOW RIDGE RD 5 52 35 11 X RWS-04314 Londonderry 4 SHADOW RIDGE RD 5 52 37 11 X RWS-04315 Londonderry 3 TYLER DR 5 21 12 11 X RWS-04316 Londonderry 4 TYLER DR 5 21 1 11 X RWS-04317 Londonderry 6 TYLER DR 5 21 2 11 X RWS-04318 Londonderry 14 TYLER DR 5 21 6 11 X RWS-04319 Londonderry 5 WAYLAND DR 5 50 31 11 X RWS-04320 Londonderry 6 WAYLAND DR 5 50 33 11 X RWS-04321 Londonderry 25 WEST RD 2 40 0 57 X RWS-04322 Londonderry 29 WEST RD 2 38 1 11 X RWS-04323 Londonderry 114 WEST RD 5 61 0 11 X RWS-04324 Londonderry 116 WEST RD 5 58 10 11 X RWS-04325 Londonderry 118 WEST RD 5 58 9 11 X RWS-04326 Londonderry 122 WEST RD 5 58 8 11 X RWS-04327 Londonderry 126 WEST RD 5 58 6 11 X RWS-04328 Londonderry 1 WILEY HILL RD 5 51 16 11 X RWS-04329 Londonderry 5 WILEY HILL RD 5 51 14 11 X RWS-04330 Londonderry 8 WILEY HILL RD 5 28 0 35 X RWS-04331 Londonderry 58 WILEY HILL RD 5 18 12 11 X RWS-04332 Londonderry 63 WILEY HILL RD 5 52 0 25 X RWS-04333 Londonderry 65 WILEY HILL RD 5 54 0 25 X RWS-04334 Londonderry 2 WINTHROP RD 5 2 6 11 X RWS-04335 Londonderry 4 WINTHROP RD 5 2 16 11 X RWS-04336 Londonderry No CAMA Data Avail 57 X RWS-04337 Merrimack 1 1/2 EDWARD LN 05C 0 647 11 X RWS-04338 Merrimack 1 ASPEN LN 07D 0 166 14 X RWS-04339 Merrimack 10 ATHERTON RD 05C 0 646 27 X RWS-04340 Merrimack 15 CHRISTOPHER RD 04C 0 271 11 X RWS-04341 Merrimack 1 EDWARD LN 05C 0 647 11 X RWS-04342 Merrimack 2 EDWARD LN 05C 0 657 11 X RWS-04343 Merrimack 4 EDWARD LN 05C 0 655 11 X RWS-04344 Merrimack 12 EDWARD LN 05C 0 652 11 X RWS-04345 Merrimack 14 EDWARD LN 05C 0 651 11 X RWS-04346 Merrimack 16 EDWARD LN 05C 0 650 11 X RWS-04347 Merrimack 2A EDWARD LN 05C 0 656 11 X

Notes: 1) Properties identified for sampling as described in the Work Plan for Water Supply Wells and Provision of Alternate Water - Addendum 4, dated September 25, 2020. 2) SLUC = State Land Use Code Prepared by: RWB Checked by: BDL/KG Reviewed by: RWB

5 of 5 B:\Saint_Gobain\NH_Merrimack\99_PROJ\1668623_MerrimackFacility\0023_Addendum4\40_PROD\1668623-0023-HS-0001_Parcels.mxd

OWN GOFFST D BED FOR

N E

C D

H F

O E

S R

D E

A A

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C B

Bedford H U

E R

S N

Fire E

Station R `

AU BURN LO ND OND ERRY

ESTER MANCH Y ND ERR LO NDO

MANCHESTER Londonderry

AIRPORT Fire Station `

B A E M D

H F

O E

R R

S D

M A L N I T C RD C H D FO H E BE Merrimack S F I T CK E RIM A E MER MERRIMACK L R Fire Station D

LANDFILL Site `

Merrimack

Fire Station `

A E

M R

H I M E

R A

S C T K `

Litchfield Fire Station

L N

I D T

C O

H N

F D

E E

L R

D R

Y LO NDOND ERRY HUD SON HUDSON

LANDFILL

A E

I M

F I

H R

C R

T E

L M K AC IM R A R B

E U HERST H I AM M S S

A N N A LLIS HO M L ELD : I CHFI T LIT M E C O H R N H N SO R O R A F UD I H F

I S E L M

H L D L D

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K D O M

N E

S E

I B

L H

L N O S A U

A H U A

H S H

S 0 5,500 11,000 H S

A E

N O U Z I

N A S

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1 " = 5,500 feet H Feet S

E H T

LEGEND N

CLIENT W O H S ! Saint-Gobain Merrimack Facility Access to Water Main is Likely S I

SAINT-GOBAIN PERFORMANCE PLASTICS A Pre-GMZ Boundary (see Note 1) Access to Water Mains is not Likely H W

Outer Boundary (see Note 1) C Potential Other Sources T !\ PROJECT A M

Town Boundary T Fire Stations 2500 ft Buffer O

RESIDENTIAL WELL WORK PLAN - ADDENDUM 4 N

Addendum 4 Properties " " E

Airport Potential Source Boundary SAINT-GOBAIN PERFORMANCE PLASTICS FACILITY O D

" " Landfill Boundary 2000 ft Buffer MERRIMACK, NH N

Identified for Sampling or Confirmation of Water Supply E M

Status TITLE E Landfill - Approximate GMZ Boundary Before AGQS R U S

PROPERTIES IDENTIFIED FOR POTENTIAL SAMPLING - A

Work Plan and Addendum 1, 2 & 3 Properties E M

NOTE(S) S

ADDENDUM 4 I

Identified for Sampling or Confirmation of Water Supply H T

1. PRE-GMZ BOUNDARY AND OUTER BOUNDARY FROM ATTACHMENT C OF F Status CONSENT DECREE, STATE OF NEW HAMPSHIRE, DEPT. OF ENVIRONMENTAL I n i SERVICES V. SAINT-GOBAIN PERFORMANCE PLASTICS CORPORATION, MARCH 20, CONSULTANT

YYYY-MM-DD 2020-09-25 1 Occupants have been Offered Bottled Water 2018. Identified for Sampling Where Occupants have been Offered 2. BOTTLED WATER STATUS DETERMINED BY PFOA CONCENTRATIONS USING DATA DESIGNED RWB PROVIDED BY NHDES IN NOVEMBER 2019 PLUS PARCELS IDENTIFIED BY NHDES Bottled Water AFTER WORK PLAN AND ADDENDUM 1, 2 AND ADDENDUM 3 SUBMITTAL. PREPARED SHL Property-Water Main Status REFERENCE(S) REVIEWED RWB 1. COORDINATE SYSTEM: NAD 1983 STATEPLANE NEW HAMPSHIRE FIPS 2800 FEET Access to Alternate Water (if applicable) confirmed by 2. BASEMAP SOURCES: ESRI, HERE, GARMIN, INTERMAP, INCREMENT P CORP., APPROVED APTM Consent Decree GEBCO, USGS, FAO, NPS, NRCAN, GEOBASE, IGN, KADASTER NL, ORDNANCE SURVEY, ESRI JAPAN, METI, ESRI CHINA (HONG KONG), (C) OPENSTREETMAP PROJECT NO. CONTROL REV. FIGURE Connection to PWS Confirmed CONTRIBUTORS, AND THE GIS USER COMMUNITY 1668623 - - 1A 0 B:\Saint_Gobain\N H_Merrimack\99_PROJ\1668623_MerrimackFacility\0023_Addendum4\40_PROD\1668623-0023-HS-0002_DDP.mxd

KEY MAP BEDFORD

MANCHESTER

MANCHESTER A1 LONDONDERRY

E ORDFO BED

A5 A2

A4 A3

Bedford Fire Station MERRIMACK `

LITCHFIELD HUDSON NASHUA

!( !( #* #* #*!( #* #* !( !( !(

#* !( #* ` #*#* MANCHESTER AIRPORT #* #* #* !( !( !( !(#*!( !(!( !( !(!( !( !(!(#*!(#* !( !(!( !( !( !(#*#* #* #* !(!( #*#* !( !( #* !( !(!( #* !( #* !( #* #*#* #* !( !( !( !( #* !( !( !( !( !(#*#*!( #* #* !( !(#*#*#* !(#*!(#*!( #* #*!( #*!(#* !( #*!(#* #*#* !( !( !(#*#* !(#* #* #* !( #*!(#*!(#* #* !(#* !( #* #* #* #* #*#* #*!(#*#* #* !( !( #*#* #*#* !( !( #*#* #* #* #* !( !(#* !( #* #*#* #*#* !( #*!(!( #* !( !(#*#*!(!(!(#* #*!( !(!(#* #* !( !( !( !(#* !(#* !( !( #*!(!(#*#*!( !(#* !( #* !( #*!( !(#* #* !( !( #* #*#*!( #* !(#*!(!(#* !(#* !(#* !( !( !(#* !( !( #*!(!(#* #*!( !(!( !( #*!( !( !(#*!(!(#* #* #*!(!(#*!(#*!(#* #* #*!(#*!( !( #* #* !( !( !(!( !( !( !(#*#*!( #*!(!(#* !(!( !( !( #* #*!( !( !(!(#* !( #*!(!(!(#*#*!(!(#* !(!(!( #* #*!(#* !(!( !(#* #*!(!(#* !(#* #*!(#*#*!(#*!( !(!( !(!( !(#* !(#* !( #*!( !(#* #*!( !(!(!( !( !( !( #* #*!( !(!( !(#*#*!(#*!( #*!( !(#* !(#* !( !(!( !( !(#*#* #* #*!( !( !( !( #* !( !( !(#* !(#* #*!( #*#* !(!( !( !( !( !(#* !( !(#* !( !(!(#* !( !( !( #*!(#*!(#*!( !( #*!(#*!(#* !( #* #* #* #*#*!(#* !( !(!(#*!(#*!( !(!( !(!(!( !( !(!( #*!(#* #*!(!(#*!(#* #*#*!( !(!(!(!( !( !( !( !(#* !( #*!( #* #* !( !( !( !( #* !(#* !(#* #* !(!(!( !( !( !( #* !( #*#*!(!(#*!( !(#* #*!(!(#* !(#* !( !(!( !( !( !( !(#* #*!( !(!( !(#*!(#* #*!( #*!(!(#*!(#* #*!(!(!(!( !( !( !( !( !( #* #*!( !( !( !( !(!( !( !( !(#* !(#* !(#*!(#*!( !( !(!( !( !( !( !(#*#*!( !( !( !( !( !( !( !(!( !(!( !(!( !( !( !( #* !( !( !( !( !( !(!(!( !( !(!(!(!(!(!( !( !( #*!( !( !( !(!( !(!( !(!( !( !( !( #* !( !( BEDFORD #* #*!( !( MERRIM ACK !( #* !( !( !( !( !( !( !(!( !( !( !( !( !( !( !( !(!(#* !( !(!( !( !(#* !( !(!( !( !(!( !( !(#* !(#*#*#* !(!( !( !(!( !(#*!( !(!( !(#* !(!( !( !( !( !( !(!( !(!( !( !( !( !( !(#*!(!( !(!( !( MERRIMACK !( !(!(#* !(!(!(!(!( !( !( !( !( !( !(!( !( Site LANDFILL !(!( !( !(!( !( !(!(!(!( !( !( !( !( !( !( !( !( !( !( #*!( Merrimack

!( !( Fire Station K C !( ` D A L

E M I !( I !( !( F R !( H R !( C !( 0 2,500 E 5,000 T !( I M L !( !(!( !( !( !( !( feet 2,486 = " 1 Feet !( !( !( !( !(!( !(!(!(!( !(!( LEGEND !( !(!(!( CLIENT !( ! Saint-GobainMerrimack Facility ConnectiontoPWS Confirmed Pre-GMZBoundary (seeNote 1) AccesstoWater Main Likelyis SAINT -GOBAINPERFORMAN CEPLASTICS OuterBoundary (seeNote 1) AccesstoWater Mains notis Likely T ownBoundary !\ PotentialOther Sources PROJECT !( N HDESSample Location FireStations ft2500Buffer RESIDEN TWELL IAL WORK PLAN ADDEN - DU M4 #* GolderSample Location """AirportPotential Source Boundary SAINT -GOBAINPERFORMAN CEPLASTICS FACILITY PFOA Results """L andfillBoundary ft2000Buffer MERRIMACK,NH N on-detect L andfillApproximate - GMZ Boundary Before AGQS T ITL E ≤12ppt PROPERTIES IDENTIFIED FOR POTENTIAL SAMPLING - >12 ppt>12 ADDENDUM 4 - AREA 1 Addendum 4 Properties NOTE(S) 1. PRE-GMZ 1. BOU N DARYAN DOU T ERBOU N DARYFROM ATT ACHMEN TCOFCON SENTDECREE, B AN SI FROM: MODIFIED BEEN HAS SIZE SHEET THE , SHOWN IS WHAT MATCH NOT DOES T REMEN MEASU THIS IF IdentifiedforSampling Confirmationor ofWater Supply Status STATEOFNEW HAMPSHIRE, DEPT OFEN . VIRON MEN T ALSERVICES SAINT V. -GOBAIN CON SU L T ANT

Y Y Y Y -MM-DD 2020-09-25 in 1 Work Plan and Addendum 1, 2 & 3 Properties PERFORMAN CEPLASTICS CORPORATION MARCH , 2018. 20, 2. BOT 2. T L EDWATER STATU DETERMINED S BY PFOA CON CEN T RATIONUSING S DATA PROVIDED BY DESIGN ED RWB IdentifiedforSampling Confirmationor ofWater Supply Status N HDESAUIN GU ST2020PLU PARCELS S IDEN TBY IFIED NHDES AFTER WORK PLAN AN ADDEN D DU M 1, 2 AN2 SU1, D3 BMITT AL. PREPARED SHL Occupantshave been Offered Bottled Water PFOA 3. DATASET BASED ON DATA PROVIDED BY NHDES AU GU2020. ST 10, 4. MOST 4. RECEN TDATA FOR EACH LOCATION SHOWN IS MU IF L. T IPLESAMPLES WERE TAKEN ON REVIEWED RWB IdentifiedforSampling Where Occupants have been Offered Bottled T HESAME DATE, THE SAMPLE WITH THE HIGHEST VALU SHOWN IS E . Water REFERENCE(S) APPROVED APTM Property-Water Main Status COORDINATE 1. SY STEM:NAD 1983STATEPLAN NEW E HAMPSHIRE FIPS2800FEET 2. BASEMAP 2. HERE,ESRI, GARMIN, OPEN (C) STREETMAPCON T RIBU T ORS,AN DTHE GISUSER PROJECTNO. CON T ROL REV. FIGU RE AccesstoAlternate Water applicable)(if confirmed by Consent Decree COMMU N ITY 1668623 - - 1B 0 B:\Saint_Gobain\N H_Merrimack\99_PROJ\1668623_MerrimackFacility\0023_Addendum4\40_PROD\1668623-0023-HS-0002_DDP.mxd !( !( !( !( !(!( !( #* !( !( !( !( !( !( !(!( !(!( !( KEY MAP !( !( !( BEDFORD !( !( !( #*!( !( !( !( !( MANCHESTER !(!( !( A1 !( LONDONDERRY !( #* !( !( BEDFORD #* #*!( !( MERRIMACK !( #* !( !( !( !( !( A5 !(!( !( A2 !( !( !( !(!( !( !( MERRIMACK !( #* !(#* !( !( !( !(!(

LANDFILL!(!( !( !(#* #*!(#*#* !(!( ` !( A4 !( !( #* !( #*!( !(!( !( !(!( !( !( !( !(!( A3 !( !( !(#* !( MERRIMACK !( !( !( !(!( !( !( !( !(#* !(!(!( !( !( !( !( !( !( !( !( !( !(!( !( !( !( !(!(!( LITCHFIELD !( !( !( !( HUDSON !( !( NASHUA !( !( !( !( !( #* !( !( !( !( !( !( !( ` !( !( !( !( Merrimack !( Fire Station !( !( !( !( !( !( !( !( !( !( !(!(!(!( !( !(!(!(!( !(!( !( !( !(!(

!(!( !( !( !( !( !( !( !( !( !( !(!( !( !( !(!( !( !(!( !( !(!( !( !( !( !( !( !( !( !( !( !( !( !( !(!( !( !( !( !( !( !( !( !( !( !(!( !( !( !( !( !(!( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( ` !( Merrimack Fire Station !( !( !( !(!( !( !( !(#*!(#* #*#*#*!( !( !(#*!( !( !( !( !( !( !(!( !( !( !( !( !(

L MERRIM ACK I T C !( H !(

I E

L D !( !( !( !( !( !( !(

Litchfield !( Fire Station ` 0 1,800 3,600

1 " = 1,881 feet 1,881 = " 1 Feet

LEGEND CLIENT ! Saint-GobainMerrimack Facility ConnectiontoPWS Confirmed Pre-GMZBoundary (seeNote 1) AccesstoWater Main Likelyis SAINT -GOBAINPERFORMAN CEPLASTICS OuterBoundary (seeNote 1) AccesstoWater Mains notis Likely T ownBoundary !\ PotentialOther Sources PROJECT !( N HDESSample Location FireStations ft2500Buffer RESIDEN TWELL IAL WORK PLAN ADDEN - DU M4 #* GolderSample Location L andfillBoundary ft2000Buffer SAINT -GOBAINPERFORMAN CEPLASTICS FACILITY PFOA Results L andfillApproximate - GMZ Boundary Before AGQS MERRIMACK,NH N on-detect T ITL E ≤12ppt PROPERTIES IDENTIFIED FOR POTENTIAL SAMPLING - >12 ppt>12 ADDENDUM 4 - AREA 2 Addendum 4 Properties NOTE(S) 1. PRE-GMZ 1. BOU N DARYAN DOU T ERBOU N DARYFROM ATT ACHMEN TCOFCON SENTDECREE, B AN SI FROM: MODIFIED BEEN HAS SIZE SHEET THE , SHOWN IS WHAT MATCH NOT DOES T REMEN MEASU THIS IF IdentifiedforSampling Confirmationor ofWater Supply Status STATEOFNEW HAMPSHIRE, DEPT OFEN . VIRON MEN T ALSERVICES SAINT V. -GOBAIN CON SU L T ANT

Y Y Y Y -MM-DD 2020-09-25 in 1 Work Plan and Addendum 1, 2 & 3 Properties PERFORMAN CEPLASTICS CORPORATION MARCH , 2018. 20, 2. BOT 2. T L EDWATER STATU DETERMINED S BY PFOA CON CEN T RATIONUSING S DATA PROVIDED BY DESIGN ED RWB IdentifiedforSampling Confirmationor ofWater Supply Status N HDESAUIN GU ST2020PLU PARCELS S IDEN TBY IFIED NHDES AFTER WORK PLAN AN ADDEN D DU M 1, 2 AN2 SU1, D3 BMITT AL. PREPARED SHL Occupantshave been Offered Bottled Water PFOA 3. DATASET BASED ON DATA PROVIDED BY NHDES AU GU2020. ST 10, 4. MOST 4. RECEN TDATA FOR EACH LOCATION SHOWN IS MU IF L. T IPLESAMPLES WERE TAKEN ON REVIEWED RWB IdentifiedforSampling Where Occupants have been Offered Bottled T HESAME DATE, THE SAMPLE WITH THE HIGHEST VALU SHOWN IS E . Water REFERENCE(S) APPROVED APTM Property-Water Main Status COORDINATE 1. SY STEM:NAD 1983STATEPLAN NEW E HAMPSHIRE FIPS2800FEET 2. BASEMAP 2. HERE,ESRI, GARMIN, OPEN (C) STREETMAPCON T RIBU T ORS,AN DTHE GISUSER PROJECTNO. CON T ROL REV. FIGU RE AccesstoAlternate Water applicable)(if confirmed by Consent Decree COMMU N ITY 1668623 - - 1C 0 B:\Saint_Gobain\NH_M errimack \99_PROJ\1668623_M errimack Facility\0023_Addendum 4\40_PROD\1668623-0023-HS -0002_DDP.mxd !( !( !( !( !(!(!( !( !(!( !( !( !( !( !( !(!(!(!( !(!(!( !( !( !(!( !( !( !( !(!( !( !(!( KEY MAP !( !( !(!(!( !( !( !(!(!( !( !( BEDFORD !( !( !(!(!( !(!( !( !( !( !( !( !( !( !(!(!( !( !(!(!( !( !( !(!( !( !(!( !( MANCHESTER !( !( !(!( !( !( !(!( !( !(!(!( !( !( !( !(!( !(!( !( !(!( !( !(!( !( !( A1 LONDONDERRY !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !(!(!( !( !( A5 !( A2 !( !( !(!( !( !( !(!( !( !( !(!(!( A4 !( A3 !( !( !( !( MERRIMACK !( !( LITCHFIELD !( !( HUDSON !( !( NASHUA !(!( !( !( !( !( !( !( !( !( #* !( !( !( !( !( #* #* !( !( #* #* !(#*!(#* #* #*#* #* #* !( !( #* !( #* !(!( #*#* #*!( !( !(!(!( !( !(#* !( !( #* !( !( !( !( !( !( !( !( !( !( !( #* !( !( Litchfield !(

` Fire Station

#* !( !(#* #* LO NDOND ERRY LITCHFIELD #*

!(#* #* !( !(

#* !(

!(!(

!( LO NDOND ERRY HUD SON

MERRIMACK LITCHFIELD

!( HUDSON !( LANDFILL

!(!(!(!( !( !( !( !( !( !(!(

LITCHFIELD U SONHUD

!( 0 1,800 3,600

1 " = 1,873 feet 1,873 = " 1 Feet

LEGEND CLIENT ! S aint-GobainMerrimack Facility ConnectiontoPW SConfirmed Pre-GM ZBoundary (see Note 1) AccesstoWater Main isLikely S AINT-GOBAINPERFORM ANCEPLAST ICS OuterBoundary (see Note 1) AccesstoWater Mains isnot Likely T ownBoundary !\ PotentialOther Sources PROJECT !( NHDESSam Location ple FireStations ft2500Buffer RESIDENTIALWELL WORK PLANADDENDUM - 4 #* GolderSam Location ple LandfillBoundary ft2000Buffer S AINT-GOBAINPERFORM ANCEPLAST ICSFACILITY PFOA Results ApproximateLandfill - GM ZBoundary Before AGQS M ERRIMACKNH , Non-detect T ITLE ≤12ppt PROPERTIES IDENTIFIED FOR POTENTIAL SAMPLING - >12 ppt>12 ADDENDUM 4 - AREA 3 Addendum 4 Properties NOTE(S) 1. PRE-GM 1. ZBOUNDARY AND OUT ERBOUNDARY FROM ATT ACHM ENTCOFCONS ENTDECREE, B I ANS : FROM MODIFIED BEEN HAS SIZE SHEET THE SHOW N, IS WHAT MATCH NOT DOES MEASUREM ENT THIS IF IdentifiedforSam plingConfirmationor ofWater Supply Status S T ATEOFNEW HAM PSDEPT HIRE, OFENVIRONM . ENTALSERVICES SAINT V. -GOBAIN CONSULTANT

Y Y Y Y -MM -DD 2020-09-25 in 1 Work Plan and Addendum 1, 2 & 3 Properties PERFORM ANCEPLAS T ICSCORPORATION MARCH , 2018. 20, 2. BOT 2. T LEDWATER ST ATUSDETERM INEDBY PFOA CONCENT RATIONSUS INGDATA PROVIDED BY DESIGNED RW B IdentifiedforSam plingConfirmationor ofWater Supply Status NHDESAUGUSIN T2020PLUS PARCELS IDENT BY IFIED NHDES AFTER WORK PLAN AND ADDENDUM 1, 2 AND2 SUBM 3 1, ITT AL. PREPARED S HL Occupantshave been Offered Bottled Water PFOA 3. DATASET BAS EDON DATA PROVIDED BY NHDES AUGUS 2020. T10, 4. MOS 4. TRECENT DATA FOR EACH LOCATION SHOWIS MULTIPLE IF N. SAM PLESWERE TAK ENON REVIEW ED RW B IdentifiedforSam plingWhere Occupants have been Offered Bottled T HESAM DATE, E THE SAM PLEWITH THE HIGHES TVALUE SHOWIS . N W ater REFERENCE(S) APPROVED APTM Property-Water Main Status COORDINATE 1. SY S T EMNAD : 1983ST ATEPLANENEW HAM PSHIREFIPS 2800FEET 2. BASEM 2. APESHERE, GARM RI, OPENS (C) IN, T REETM APCONT RIBUT ORSAND THE , GISUS ER PROJECTNO. CONTROL REV. FIGURE AccesstoAlternate Water applicable)(if confirmed by Consent Decree COM M UNITY 1668623 - - 1D 0 B:\Saint_Gobain\N H_Merrimack\99_PROJ\1668623_MerrimackFacility\0023_Addendum4\40_PROD\1668623-0023-HS-0002_DDP.mxd #* #* #*#* KEY MAP !( #*#* #* BEDFORD !( #*#*!( !( #* #* MANCHESTER !(!( #* !(

A1 LONDONDERRY

A5 #* A2

A4 A3

MERRIMACK #* !( #* LITCHFIELD #* HUDSON #* NASHUA !(

!( !(

#* !( #*!( #* #* #* #* !(#* #*

#* #* #*#* #* #* #*!( #* #* !( #* !( !( #*!( !( !(#* #* !(

!( #* #* !( #* !( #* #* #* #* #* #*#* #* #*

LO NDOND ERRY !( #*

LITCHFIELD

0 1,250 2,500

1 " = 1,281 feet 1,281 = " 1 Feet LO NDOND ERRY HUD SON LEGEND CLIENT ! Saint-GobainMerrimack Facility AccesstoWater Main Likelyis Pre-GMZBoundary (seeNote 1) AccesstoWater Mains notis Likely SAINT -GOBAINPERFORMAN CEPLASTICS OuterBoundary (seeNote 1) L andfillBoundary ft2000Buffer

T ownBoundary L andfillApproximate - GMZ Boundary Before AGQS PROJECT !( N HDESSample Location RESIDEN TWELL IAL WORK PLAN ADDEN - DU M4 #* GolderSample Location SAINT -GOBAINPERFORMAN CEPLASTICS FACILITY PFOA Results MERRIMACK,NH N on-detect T ITL E ≤12ppt PROPERTIES IDENTIFIED FOR POTENTIAL SAMPLING - >12 ppt>12 ADDENDUM 4 - AREA 4 Addendum 4 Properties NOTE(S) 1. PRE-GMZ 1. BOU N DARYAN DOU T ERBOU N DARYFROM ATT ACHMEN TCOFCON SENTDECREE, B AN SI FROM: MODIFIED BEEN HAS SIZE SHEET THE , SHOWN IS WHAT MATCH NOT DOES T REMEN MEASU THIS IF IdentifiedforSampling Confirmationor ofWater Supply Status STATEOFNEW HAMPSHIRE, DEPT OFEN . VIRON MEN T ALSERVICES SAINT V. -GOBAIN CON SU L T ANT

KEY MAP BEDFORD

MANCHESTER

A1 LONDONDERRY

!( A5 A2 !( !( !(

!( A4 A3

MERRIMACK !( LITCHFIELD !( HUDSON NASHUA !( !( !( !(

#* #* !( !( #*!( #* #* !( !(

LO NDOND ERRY !(

LITCHFIELD #* #* #*#* #* !( #* !(#* !( #*!(#* !( !( !( #* #* !( #* #* !( !(#* #*

#* #* #* !( #*#* #* !( #* !(#* #* #* #* #*#* !( #*#* #* !( #*#*!( !( #* #* !(!( #* !(

#* 0 1,250 2,500 !( #* #* feet 1,248 = " 1 Feet #*

LEGEND CLIENT !( ! Saint-GobainMerrimack Facility ConnectionPWSto Confirm ed Pre-GMZBoundary (seeNote 1) AccessLikelyWater to is Main SAINT-GOBAINPERFORMAN CEPLASTICS OuterBoundary (seeNote 1) AccessLikelynotWater to is Mains

TownBoundary PROJECT !( N HDESSam pleLocation RESIDEN TIALWELL WORK PLAN ADDEN - DU M4 #* GolderSam pleLocation SAINT-GOBAINPERFORMAN CEPLASTICS FACILITY PFOA Results MERRIMACK,NH N on-detect TITLE ≤12ppt PROPERTIES IDENTIFIED FOR POTENTIAL SAMPLING - >12 ppt>12 ADDENDUM 4 - AREA 5 Addendum 4 Properties NOTE(S) 1. PRE-GMZ 1. BOU N DARYAN DOU TERBOU N DARYFROM ATTACHMEN COF TCON SENTDECREE, B AN SI FROM: MODIFIED BEEN HAS SIZE SHEET THE , SHOWN IS WHAT MATCH NOT DOES T REMEN MEASU THIS IF Identifiedfor Sam plingorConfirm ofWater ation Supply Status STATEOFNEW HAMPSHIRE, DEPTOF EN . V IRON MEN TALSERV ICESSAINTV. -GOBAIN CON SU L TANT

YYYY-MM-DD 2020-09-25 in 1 Work Plan and Addendum 1, 2 & 3 Properties PERFORMAN CEPLASTICS CORPORATION MARCH , 2018. 20, 2. BOTTLED 2. WATER STATUS DETERMINED BYPFOA CON CEN TRATIONUSING S DATA PROV IDEDBY DESIGN ED RWB Identifiedfor Sam plingorConfirm ofWater ation Supply Status N HDESAUIN GU ST2020PLU PARCELS S IDEN BY TIFIEDNHDES AFTER WORK PLAN AN ADDEN D DU M 1, 2 AN2 SU1, D3 BMITTAL. PREPARED SHL Occupantshave been Offered Bottled Water PFOA 3. DATASET BASED ON DATA PROV IDEDBYNHDES AU GU2020. ST10, 4. MOST 4. RECEN DATA T FOR EACH LOCATION SHOWN IS MU IF L. TIPLESAMPLES WERE TAKEN ON REVIEWED RWB Identifiedfor Sam plingWhere Occupants have been Offered Bottled THESAME DATE, THE SAMPLE WITH THE HIGHEST VALU SHOWN IS E . Water REFERENCE(S) APPROV ED APTM Property-Water Main Status COORDINATE 1. SYSTEM: NAD 1983STATEPLAN NEW E HAMPSHIRE FIPS2800FEET 2. BASEMAP 2. HERE,ESRI, GARMIN, OPEN (C) STREETMAPCON TRIBU TORS,AN DTHE GISUSER PROJECTNO. CON TROL REV. FIGU RE AccessAlternateto applicable) Water (if confirm edby Consent Decree COMMU N ITY 1668623 - - 1F 0