44-25 Exhibit A-DPW_VI Sampling_1.17.2025.pdf

44-25 Exhibit A Matrix New World Engineering, Land Surveying and Landscape Architecture, P.C. 26 Columbia Turnpike Florham Park, NJ 07932 973.240.1800 Fax 973.240.1818 www.mnwe.com Via Email (zcarballo@westorange.org) January 17, 2025 Ms. Zayibeth Carballo, PE, PLS, PP, CME, CFM, CFS, Municipal Engineer Township of West Orange 25 Lakeside Avenue West Orange, NJ 07052 Re: PROPOSAL FOR ENVIRONMENTAL SERVICES – LONG TERM MONITORING - VAPOR INTRUSION INVESTIGATION TOWNSHIP OF WEST ORANGE DEPARTMENT OF PUBLIC WORKS (DPW) 25 LAKESIDE AVENUE BLOCK 115, LOT 16 WEST ORANGE, NEW JERSEY NJDEP SRP PI NO. 014423 MATRIX NO. P25-0037 Dear Ms. Zayibeth Carballo: Matrix New World Engineering, Land Surveying, and Landscape Architecture, P.C. (Matrix) is pleased to provide this proposal to complete long-term monitoring - vapor intrusion investigation activities and prepare a Vapor Intrusion Letter Report for submission to the New Jersey Department of Environmental Protection (NJDEP) for the Township of West Orange Department of Public Works (DPW) property, located at 25 Lakeside Avenue (Block 115, Lot 16) in the Township of West Orange (Township), New Jersey (Site). The long-term monitoring - vapor intrusion activities will be completed in compliance with the NJDEP Technical Requirements for Site Remediation (TRSR), the Site Remediation Reform Act (SRRA), the Administrative Requirements for the Remediation of Contaminated Sites (ARRCS), and the NJDEP’s Vapor Intrusion Technical Guidance. SCOPE OF WORK The scope of services and associated fees are described below. Task 1: Vapor Intrusion Investigation An initial vapor intrusion (VI) investigation was completed in 2014, and the results were presented in the 2016 Remedial Investigation Report (RIR) prepared by T&M Associates. The sampling included the collection of four sub-slab soil gas (SSSG), two indoor air (IA), and one ambient air (AA) samples for EPA TO-15 analysis. The following exceedances were identified: 1,4dichlorobenzene concentrations above the Non-Residential Indoor Air Screening Level (NRIASL) in two IA samples and trichloroethene (TCE) concentrations above the Non-Residential Soil Gas Screening Level (NRSGSL) in three SSSG samples. The concentration of TCE in sample SSAS3 was elevated to nearly an order of magnitude (10x) greater than the current NRSGSL. Based on the 2014 VI investigation results, T&M

GSL) in three SSSG samples. The concentration of TCE in sample SSAS3 was elevated to nearly an order of magnitude (10x) greater than the current NRSGSL. Based on the 2014 VI investigation results, T&M Associates recommended a long-term monitoring program for the Site which included regular building inspections and sampling of the indoor air in years 4 and 6. There was no record of this sampling being completed. F:\2025\25-0037 West Orange DPW\Proposal\LTM VI Proposal\DPW_VI Sampling_1.17.2025.docx

A Preliminary Assessment was conducted as part of due diligence by Matrix in 2021 which identified additional areas of concern (AOCs) at the Site including the need for additional vapor intrusion evaluation in accordance with the May 2021 Vapor Intrusion Technical Guidance. Therefore, during the heating season in 2023, Consulting & Municipal Engineers Associates (CME), completed an additional vapor intrusion investigation at the Site. The vapor intrusion investigation was performed to evaluate the potential impacts to indoor air quality due to groundwater impacts identified in monitoring well MW-10 at concentrations exceeding the NJDEP Vapor Intrusion Groundwater Screening Levels (VIGSL) and the presence of LNAPL in monitoring well, MW-9. During this sampling event, three IA samples, six SSSG samples, and one AA sample were collected from the Site. Based on the analytical results, benzene and ethylbenzene were identified in the IA samples above the indoor air remediation standards but below the rapid action levels and Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (PEL), the National Institute of Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL) and the American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV). The benzene and ethylbenzene impacts identified in the IA samples were most likely associated with Site operations as these compounds were not identified in the SSSG samples. However, TCE was identified in the SSSG samples above the soil gas screening levels and the Residential Indoor Air Remediation Standards (RIARS) but below the Non-Residential Indoor Air Remediation Standards (NRIARS) and the OSHA and NIOSH standards identified above. Based on results of previous investigations and as per the NJDEP Vapor Intrusion Technical guidance long-term monitoring for vapor intrusion is recommended. Matrix will coordinate the necessary access to conduct the vapor intrusion activities at the Site. The vapor intrusion investigation activities will include the collection of SSSG, IA, and AA samples from within and beneath the Site building. At least 24 hours prior to completing the SSSG and IA sampling, Matrix will complete a building walkthrough (Site inspection) and removal of any potential background sources. Matrix personnel will complete the NJDEP Indoor Air Building

ng the SSSG and IA sampling, Matrix will complete a building walkthrough (Site inspection) and removal of any potential background sources. Matrix personnel will complete the NJDEP Indoor Air Building Survey and Sampling Form for the Site. Based on the results of the 2023 vapor intrusion sampling activities and in accordance with the NJDEP May 2021 Vapor Intrusion Technical Guidance (Version 5.0), long term monitoring is required for the Site building. The May 2021 Vapor Intrusion Technical Guidance states that long term monitoring is required for a Site without a mitigation system installed as the appropriate mitigation action. The frequency of inspections and sampling events is based on the SSSG concentrations. Therefore, Matrix is recommending the completion of the following sampling plan for the 2025 heating season (Samples should be completed before March 31st). 1. Commercial – 25 Lakeside Avenue, West Orange, New Jersey (approximately 51,815 square feet) a. eight sub slab soil gas samples (three in the office area and five in the garage area), four indoor air samples (three in the office area and only one in the garage area break room), and one ambient air sample. Please note that indoor air samples will not be collected in the garage portion of the Site with the exception of the break room as operations in the garage area use, handle, or store the same investigative contaminants of concern (COCs) as found in the soils and groundwater. The IA/AA samples will be placed on hold and the SSSG samples will be analyzed for volatile organic compounds (VOCs) via USEPA TO-15 method. The IA/AA samples will be collected prior F:\2025\25-0037 West Orange DPW\Proposal\LTM VI Proposal\DPW_VI Sampling_1.17.2025.docx 2

to the SSSG samples. Each sample will be collected in a dedicated six-liter summa canister, placed at various locations throughout the buildings, with the AA canisters placed outside. The flow controller on the canister allows the air samples to be collected over a 24-hour period. At the conclusion of the 24-hour sampling event, Matrix will retrieve the IA and AA sample canisters and will prepare the SSSG samples. The SSSG samples will be obtained from below the buildings’ concrete slabs. Each SSSG sample will be collected from tubing inserted into a ½ inch diameter sample point. The annulus between the tubing and the temporary sample point will be sealed. Matrix will perform a leak test on the soil gas probe and all fittings of the sample train prior to sample collection in the laboratory supplied and calibrated 1-liter stainless steel canister with a flow controller. Following the collection of the SSSG samples, each drilled hole will be patched. At the conclusion of the sampling event, all air samples (SSSG, IA, AA) will be transported to a NJDEP Certified laboratory under a proper chain of custody. The samples will be analyzed for VOCs utilizing EPA TO-15 method. The results of the SSSG samples will be compared to the NJDEP Non-Residential Soil Gas Screening Levels (NRSGSL) and NJDEP Residential Soil Gas Screening Levels (RSGSL) to determine if the potential for a VI pathway exists. If the contaminants of concern are identified in the SSSG samples above the NJDEP RSGSL or NRSGSL, then the contingent IA/AA samples will be analyzed. The IA/AA samples will be compared to the NJDEP NRIARS, the NJDEP Non-Residential Rapid Action Levels (NRRAL), NJDEP RIARS, the NJDEP Residential Rapid Action Levels (RRAL), and OSHA and NIOSHA standards. If during the inspection cracks in the floor are identified and depending on the 2025 sampling results, Matrix may recommend floor repair cracks resampling of indoor air. An additional proposal would be prepared for this work, if required. Task 2: NJDEP Vapor Intrusion Preparation Following receipt of the analytical results, Matrix will prepare the NJDEP required Full Laboratory Data Deliverable Form and Vapor Investigation Finding Letter for review by the Township and LSRP of record. Matrix will not submit the vapor intrusion submission to the NJDEP, West Orange Health Department, and the New Jersey Department of Health.

inding Letter for review by the Township and LSRP of record. Matrix will not submit the vapor intrusion submission to the NJDEP, West Orange Health Department, and the New Jersey Department of Health. Please note that Matrix will not be able to submit to the NJDEP on behalf of the Township without being retained as Licensed Site Remediation Professional (LSRP) of record. Therefore, the LSRP of record, Manal Baba of CME will have to review and submit the analytical results and findings letter to the NJDEP as it requires LSRP signature or Matrix will have to be retained as LSRP of record for at least AOC-22 – Vapor Intrusion or the entire Site. Please see task 3 below for more details. The report will summarize investigation activities, results, findings, conclusions, and recommendations for the property. Please note that the Vapor Intrusion reporting is due to the NJDEP 30-days after final laboratory report is issued. Task 3: LSRP Retention In accordance with the SRRA, ARRCS, and the TRSR, Matrix will submit the LSRP Retention Form via the NJDEP Online Portal. The VI investigation summarized above for the subject site is being driven by groundwater exceedances identified in monitoring well MW-10 which is an upgradient well, indicating VI F:\2025\25-0037 West Orange DPW\Proposal\LTM VI Proposal\DPW_VI Sampling_1.17.2025.docx 3

impacts on-site may be due to contaminants migrating on-site from an upgradient, off-site source. However, this does not rule out the potential that the impacts identified in groundwater samples collected from MW-10 are not due to operations associated with the DPW property. The source of the impacts identified in MW-10 are not clear at this time. The LSRP of record for the DPW will be required to submit the results of sampling and all required NJDEP reporting. If Matrix is retained as LSRP of record for AOC-22 – Vapor Intrusion or entire Site, Matrix will submit the NJDEP Vapor Intrusion reporting that is required by the NJDEP within 30-days of final laboratory report is issued. In addition, in accordance with the TRSR, the person responsible for conducting the remediation of a contaminated site is required to perform public notification and outreach. Matrix will post a Public Notification sign and submit a revised public notification form to the NJDEP. In accordance with the NJDEP SRRA, the ARRCS, and the TRSR, the retained Matrix LSRP will oversee the investigation activities outlined above and if retained as the LSRP of record for the entire Site future remediation tasks as well. This task includes project management, NJDEP correspondence and coordination, and the anticipation of future conference calls and/or meetings with the project team. COSTS The following are the estimated costs not to exceed for the tasks described herein to complete the vapor intrusion activities at the DPW Site. All work will be conducted in accordance with the attached standard terms and conditions and LSRP Special Provisions. Task 1: Vapor Intrusion Investigations Labor .....................................................................................................................$ 5,770.00 Direct Expenses .....................................................................................................$ 8,610.00 Task 1 Total Estimated Costs ................................................................................ 14,380.00 Task 2: Prepare NJDEP Vapor Intrusion Submission Labor .....................................................................................................................$ 5,110.00 Direct Expenses .....................................................................................................$ 250.00 Task 2 Total Estimated Costs

...................................$ 5,110.00 Direct Expenses .....................................................................................................$ 250.00 Task 2 Total Estimated Costs ................................................................................ 5,360.00 Task 3: LSRP Retention and PM Labor .....................................................................................................................$ 1,760.00 Direct Expenses .....................................................................................................$ 460.00 Task 3 Total Estimated Costs ................................................................................ 2,220.00 ESTIMATED COSTS TASK 1 THROUGH TASK 3 ...............................................$ 21,960.00 ASSUMPTIONS AND EXCLUSIONS This proposal is based on the following assumptions: ▪ All field work will be completed in Level D personal protective equipment; ▪ All samples will be analyzed on a standard turnaround time basis, unless otherwise noted; ▪ All investigation derived waste will be disposed of as non-hazardous waste; ▪ No additional assessment or investigation activities or LSRP documents beyond the activities identified in the scope of work are included; F:\2025\25-0037 West Orange DPW\Proposal\LTM VI Proposal\DPW_VI Sampling_1.17.2025.docx 4

▪ ▪ ▪ ▪ All work will be completed during normal business hours; Costs exclude any NJDEP inspections; Costs do not include any additional NJDEP notification or reporting fees; and All external costs will be charged at cost plus 15%. Separate authorization from the client will be requested prior to commencing services outside the scope of this proposal. All out-of-pocket expenses including, but not limited to, application fees, laboratory testing costs, mylar copies, certified mailings, photographs, blueprints, and special deliveries are considered additional to the proposal items unless specifically noted within the scope of this proposal. This proposal is submitted solely and exclusively for the use of the Township of West Orange for consideration of the professional services of Matrix. Disclosure of this proposal’s content to any third party without prior written authorization from Matrix is expressly prohibited. In addition to the specific items as listed herein, the client may be required to demonstrate compliance with certain permit and approval conditions as may be imposed by one or more of the regulatory agencies. These conditions may require revisions to the plans and/or preparation of additional supporting documentation. This proposal does not include these additional items unless specifically outlined within the scope of this proposal. PAYMENT SCHEDULE Payment shall be in accordance with the Charges, Billing, and Payment schedule outlined in the Terms and Conditions attached to this proposal unless prior written arrangements have been made with Matrix. Please indicate your acceptance of this proposal by (1) signing in the space provided below, (2) signing the attached Terms and Conditions, and (3) signing the attached Special LSRP Provisions and returning one copy to our offices. We thank you for the opportunity to be of service to you on this project. Matrix is prepared to implement the described Scope of Work upon receiving a signed copy of this letter. If you have any questions or require any additional information, do not hesitate to contact us at (973) 2401800. Sincerely, Allison Molnar Project Manager Mark Sprengel, LSRP Project Manager Authorization to Proceed: Date: Name/Title Attachments: Terms and Conditions Special Provisions - LSRP F:\2025\25-0037 West Orange DPW\Proposal\LTM VI Proposal\DPW_VI Sampling_1.17.2025.docx 5

MATRIXNEWORLD Engineering Progress ATTACHMENT 1 TERMS AND CONDITIONS