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

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