167-22 Exhibit.pdf

MATRIXNEWORLD Engineering Progress 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 Non-Residential Indoor Air Screening Levels (NRIASL), the NJDEP Non- Residential Rapid Action Levels (NRRAL), NJDEP Residential Indoor Air Screening Levels (RIASL), and the NJDEP Residential Rapid Action Levels (RRAL). Following receipt of the analytical results, Matrix will prepare the NJDEP required Full Laboratory Data Deliverable Form and Vapor Investigation Finding Letter for submission to the NJDEP, West Orange Health Department, the New Jersey Department of Health (if indoor air samples are analyzed), and owners/occupants of the investigated buildings. The report will summarize investigation activities, results, findings, conclusions, and recommendations for the property. In addition, per NJDEP request Matrix will complete an Open Public Records Act (OPRA) request for the documents associated with an upgradient property located at 15 Central Avenue (Block 10, Lot 1.10) to confirm a vapor intrusion investigation has been completed. This property is currently within 100 feet of the Biddelman groundwater plume. However, this property is part of the Site Remediation Program (SRP) with Program Interest No (PI No) G00040517 (Former Kaye & Macdonald Incorporated) and based on analytical data provided by their LSRP has their own vapor intrusion trigger. Based on NJDEP DataMiner, a Full Laboratory Data Deliverables Form and Analytical Results were received by the NJDEP on February 27, 2019. Task 2: Revised Remedial Investigation Report Following the receipt and evaluation of the vapor intrusion data, the RI Report and associated forms will be revised and will summarize the results of the additional off-site vapor intrusion remedial investigation activities. The report will consist of figures, tables, conclusions, and recommendations. Following a review of the Draft Report by the Township of West Orange, comments will be incorporated in the revised Final Remedial Investigation Report that will be submitted to NJDEP. This revised RIR will need to be submitted to the NJDEP on or before August 6, 2022. The following forms may be required during the addendum RI: 7 Case Inventory Document (CID) . Authorization to Submit a

vised RIR will need to be submitted to the NJDEP on or before August 6, 2022. The following forms may be required during the addendum RI: 7 Case Inventory Document (CID) . Authorization to Submit a Report Through NJDEP Online = Cover/Certification Form . CEA Fact Sheet . Updated Receptor Evaluation Finally, Matrix will notify the NJDEP of an off-site source of CVOCs mitigating onto the Biddelman Property from an unknown source. Once the NJDEP is notified, the LSRP will issue an Area of Concern (AOC) Response Action Outcome (RAO) to release the Township of responsible associated with the contamination identified in monitoring well MW-11D (off-site contamination not associated with Biddelman). COSTS The following are the estimated costs for the tasks described herein to complete the revised RI for the Biddelman Site. All work will be conducted in accordance with the attached standard terms and conditions and LSRP Special Provisions. F:\2018\18-286 Biddleman - 8-10 Central Avenue\Proposal\Vapor Intrusion Proposal_Off-site - June 2022\G000006148 Biddelman Proposal off-site VI-FINAL.docx 3