44-25 Exhibit B-Complete - VI Letter Report - DPW West Orange - April 2023.pdf

ated to vapor intrusion issue as there is no completed VI exposure pathway at these locations. It could be related to using an air freshener or cleaning detergent at these locations, no further action is necessary for this pathway. P:\I00 CME7\West Orange\DPW 25 Lakeside Ave\VI Investigation 2023\VI letter Report\VI Letter Report - DPW West Orange - April 2023.docx

Bureau of Case Assignment &Initial Notice Re: Vapor Intrusion Investigation Report West Orange DPW 25 Lakeside Ave April 2023 Page 9 Based on the assessment of the results, these contaminants are found in the IA, but not the SSSG samples. These compounds are likely originating from background sources unrelated to VI and there is no completed VI exposure pathway. In this case, the Mitigation Decision Matrix directs the investigator to evaluate vadose zone (soil) contamination and preferential pathways as potential contributors to IA contamination, it is established that VI is not contributing to the IA contamination, no further action is necessary for this pathway. Concentrations of trichloroethene were reported above the Residential VI Exposure Pathway Remediation Standard Criteria in samples IA-1, IA-2 and IA-3 at concentrations that exceeded only Residential Indoor Air Remediation Standards (does not apply to the Site), however they were below the Rapid Action Levels (RAL). Trichloroethene was detected above the Non-Residential and Residential Soil-Gas Screening Levels in the sub-slab soil gas samples. Therefore, long -term monitoring (LTM), without system installation, may be the appropriate mitigative action. Table 1 presents the analytical results of the indoor air gas samples. Indoor Air at DPW Garage - Maintenance Area – Storage/Repair Garage : Indoor Air sampling was not conducted within the DPW Garage. In general, the investigator should not collect IA samples in a building (or portion of a building) where operations use, handle or store the same investigative Contaminant of Concern (COC) (e.g., dry cleaners, active gas service stations, maintenance facilities, various industrial operations). In these situations, it is difficult to determine whether air contaminants present in a building are from operational activities within the facility or from the subsurface (VI). “As recommended by the NJDEP Vapor Intrusion Technical Guidance, indoor air samples were not collected at (fill in name/address of specific building) due to operational use, handling or storage of the investigative COC within the building (insert alternative language if appropriate based on site-specific circumstances). Thus, the VI pathway at this building is “indeterminate.” Unless otherwise dictated by permit requirements, annual inspections of this building are necessary to

based on site-specific circumstances). Thus, the VI pathway at this building is “indeterminate.” Unless otherwise dictated by permit requirements, annual inspections of this building are necessary to identify any change in use. A change in use necessitates the prompt completion of the VI investigation consistent with N.J.A.C. 7:26E-1.15.” Sub-slab Soil Gas Sampling Results: Benzene was detected in one sub-slab soil gas sample (SSSG-4) located within the DPW garage area at a concentration 2.5 µg/m3 which is below the Non-Residential and Residential Soil-Gas Screening Levels. P:\I00 CME7\West Orange\DPW 25 Lakeside Ave\VI Investigation 2023\VI letter Report\VI Letter Report - DPW West Orange - April 2023.docx

Bureau of Case Assignment &Initial Notice Re: Vapor Intrusion Investigation Report West Orange DPW 25 Lakeside Ave April 2023 Page 10 Concentrations of trichloroethene were reported above the Non-Residential and Residential SoilGas Screening Levels (SGSL) in samples SSAS-2, SSSG-3, SSSG-5 and SSSG-6. Based on the assessment of the results, trichloroethene is found in the sub-slab soil gas (SSSG) samples but below the Non-Residential Indoor Air Remediation Standards in the indoor air (IA) samples. In this case, the Mitigation Decision Matrix indicates that sampling results of SSSG that are greater than the SGSL but at or less than 10 times the Non-Residential SGSL, long-term monitoring (LTM) is recommended. The following details the recommended LTM schedule: First year LTM: 1. Annual inspection of building 2. Sampling of IA during heating season. After first year LTM: 1. Annual inspections of building 2. Sampling of IA every five years Table 2 presents the analytical results of the sub-slab gas samples. Appendix 2 presents the Indoor Air, Ambient Air and Sub Slab Gas Laboratory Analytical Results, QA/QC Documents and Chain of Custody Forms. P:\I00 CME7\West Orange\DPW 25 Lakeside Ave\VI Investigation 2023\VI letter Report\VI Letter Report - DPW West Orange - April 2023.docx

Bureau of Case Assignment &Initial Notice Re: Vapor Intrusion Investigation Report West Orange DPW 25 Lakeside Ave April 2023 Page 11 (Excerpts from NJDEP Vapor Intrusion Guidance, dated May 2021- Version 5.0 ) 4.0 CONCLUSION The analytical results of the vapor intrusion investigation indicated that all volatile organic compounds were below the most stringent NJDEP regulatory levels. The results of the soil gas and indoor air investigations and the “building walkthrough and survey” were evaluated in accordance with the criteria outlined in the Decision Flow Chart for Vapor Intrusion Pathway and Section 3.1 of the VIG Document. Based on the investigation results reviewed by CME and according to the NJDEP Vapor Intrusion Guidance, no further vapor intrusion investigation action is required at the Site. Future monitoring/ long-term monitoring (LTM) is recommended as detailed above. P:\I00 CME7\West Orange\DPW 25 Lakeside Ave\VI Investigation 2023\VI letter Report\VI Letter Report - DPW West Orange - April 2023.docx

Bureau of Case Assignment &Initial Notice Re: Vapor Intrusion Investigation Report West Orange DPW 25 Lakeside Ave April 2023 Page 12 NJDEP Variance: Since the last update of the Technical Rules (August 6, 2018) and available variances (February 4, 2019), the Department has implemented changes related to the VI pathway that will be reflected in the future regulatory revisions. The following available VI related variances are recognized by the Department and acceptable for use by the investigator: • 7:26E-1.7(a) – The Department no longer requires notice on a separate form prior to varying from a technical requirement. The Variance Identification form is no longer available. Rather, on each Key Document form (i.e., SI, RI, RA, etc.), complete the section indicating that the particular phase of the remediation includes a variance taken under N.J.A.C. 7:26E-1.7. • 7:26E-1.15(c)1 – The Department no longer expects a notification (by form or spreadsheet) of future sampling events. • 7:26E-1.15(g) – The Department no longer utilizes the Heath Department Notification Levels. In addition, the Department no longer requires the submission of indoor and ambient air analytical results to the New Jersey Department of Health, except for samples collected at educational facilities and child care centers as defined in "Standards for Indoor Environment Certification and for Licensure of Indoor Environmental Consultants," N.J.A.C. 8:50-1.3 and pursuant to N.J.A.C. 7:26E1.15(h). "Per the Department's direction as noted in the NJDEP Listserv entitled "[SRRA]: Submission of indoor and ambient air analytical results to the New Jersey Department of Health," indoor and ambient air analytical results, including all maps and figures related to the indoor air sampling, and a sample location spreadsheet do not need to be submitted to the New Jersey Department of Health pursuant to N.J.A.C. 7:26E-1.15(h) unless samples are collected at educational facilities or child care centers as defined in "Standards for Indoor Environment Certification and for Licensure of Indoor Environmental Consultants", N.J.A.C. 8:50-1.3." P:\I00 CME7\West Orange\DPW 25 Lakeside Ave\VI Investigation 2023\VI letter Report\VI Letter Report - DPW West Orange - April 2023.docx

TABLE 1 INDOOR AIR & AMBIENT AIR SAMPLE ANALYTICAL RESULTS (APRIL 2023) West Orange DPW - 25 LAKESIDE AVENUE WEST ORANGE, ESSEX COUNTY, NEW JERSEY SAMPLE ID: LAB ID: COLLECTION DATE: NJDEP REMEDIATION STANDARDS VI Exposure Indoor Air IA Rapid Action Pathway Remediation Levels Remediation Std Standards NJ-RIARSNJ-NRIARS NJ-RIAS NJ-NRIAS NJ-IRRAL NJ-INRAL SAMPLE MATRIX: ANALYTE IA-1 L2317290-01 4/2/2023 IA-2 L2317290-02 4/2/2023 IA-3 L2317290-03 4/2/2023 AA-040123 L2317290-04 4/2/2023 AIR AIR AIR AIR CAS (ug/m3) (ug/m3) (ug/m3) (ug/m3) (ug/m3) (ug/m3) Conc RL MDL 1,1,1-Trichloroethane 1,1,2,2-Tetrachloroethane 1,1,2-Trichloroethane 1,1-Dichloroethane 1,1-Dichloroethene 1,2,4-Trichlorobenzene 1,2,4-Trimethylbenzene 1,2-Dibromoethane 1,2-Dichlorobenzene 1,2-Dichloroethane 1,2-Dichloropropane 1,3,5-Trimethybenzene 1,3-Butadiene 1,3-Dichlorobenzene 1,4-Dichlorobenzene 1,4-Dioxane 2,2,4-Trimethylpentane 2-Butanone 2-Chlorotoluene 3-Chloropropene 71-55-6 79-34-5 79-00-5 75-34-3 75-35-4 120-82-1 95-63-6 106-93-4 95-50-1 107-06-2 78-87-5 108-67-8 106-99-0 541-73-1 106-46-7 123-91-1 540-84-1 78-93-3 95-49-8 107-05-1 5200 21 3.7 63 1.5 210 7.3 0.92 830 0.72 5200 - 22000 88 8.8 260 1.5 880 31 3.3 3500 2.5 22000 - 5200 21 3.7 63 1.5 210 7.3 0.92 830 0.72 5200 - 22000 88 8.8 260 1.5 880 31 3.3 3500 2.5 22000 - 10000 42 4.2 130 1.5 420 15 8.4 1700 56 10000 - 44000 180 18 520 2 1800 62 36 7000 250 44000 - 1.5 ND ND ND ND ND 2 ND ND ND ND ND ND ND ND ND 3.6 2.5 ND ND Q 1.1 1.4 1.1 0.81 0.79 1.5 0.98 1.5 1.2 0.81 0.92 0.98 0.44 1.2 1.2 0.72 0.93 1.5 1 0.63 RL MDL Conc - 1.2 ND ND ND ND ND 2.2 ND ND ND ND ND ND ND ND ND 4.3 2.7 ND ND Q 1.1 1.4 1.1 0.81 0.79 1.5 0.98 1.5 1.2 0.81 0.92 0.98 0.44 1.2 1.2 0.72 0.93 1.5 1 0.63 RL MDL Conc - 2 ND ND ND ND ND 2.3 ND ND ND ND ND ND ND ND ND 4 2.2 ND ND Q 1.1 1.4 1.1 0.81 0.79 1.5 0.98 1.5 1.2 0.81 0.92 0.98 0.44 1.2 1.2 0.72 0.93 1.5 1 0.63 RL MDL Conc - ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND Q 1.1 1.4 1.1 0.81 0.79 1.5 0.98 1.5 1.2 0.81 0.92 0.98 0.44 1.2 1.2 0.72 0.93 1.5 1 0.63 - 4-Ethyltoluene 4-Methyl-2-pentanone Acetone Benzene Bromodichloromethane Bromoform Bromomethane Carbon disulfide Carbon

0.81 0.79 1.5 0.98 1.5 1.2 0.81 0.92 0.98 0.44 1.2 1.2 0.72 0.93 1.5 1 0.63 - 4-Ethyltoluene 4-Methyl-2-pentanone Acetone Benzene Bromodichloromethane Bromoform Bromomethane Carbon disulfide Carbon tetrachloride Chlorobenzene Chloroethane Chloroform Chloromethane cis-1,2-Dichloroethene cis-1,3-Dichloropropene Cyclohexane Dibromochloromethane Dichlorodifluoromethane Ethanol Ethylbenzene Freon-113 Freon-114 Heptane Hexachlorobutadiene Isopropanol Methyl Methacrylate Methyl tert butyl ether Methylene chloride n-Hexane o-Xylene p/m-Xylene Styrene Tertiary butyl Alcohol Tetrachloroethene Tetrahydrofuran Toluene trans-1,2-Dichloroethene trans-1,3-Dichloropropene Trichloroethene Trichlorofluoromethane Vinyl bromide Vinyl chloride 622-96-8 108-10-1 3100 67-64-1 71-43-2 0.64 75-27-4 75-25-2 74-83-9 5.2 75-15-0 730 56-23-5 1.3 108-90-7 52 75-00-3 10000 67-66-3 100 74-87-3 94 156-59-2 10061-01-5 0.91 110-82-7 6300 124-48-1 75-71-8 64-17-5 100-41-4 1.1 76-13-1 5200 76-14-2 142-82-5 87-68-3 67-63-0 80-62-6 1634-04-4 11 75-09-2 280 110-54-3 730 95-47-6 100 179601-23-1 100 100-42-5 1000 75-65-0 127-18-4 11 109-99-9 108-88-3 5200 156-60-5 10061-02-6 0.91 79-01-6 1.1 75-69-4 593-60-2 75-01-4 0.64 13000 1.6 22 3100 2 220 44000 430 390 3.1 26000 4.9 22000 47 1200 3100 440 440 4400 47 22000 3.1 3 2.8 3100 0.64 5.2 730 1.3 52 10000 100 94 6300 1.1 5200 11 280 730 100 100 1000 11 5200 1.1 0.64 13000 1.6 22 3100 2 220 44000 430 390 26000 4.9 22000 47 1200 3100 440 440 4400 47 22000 3 2.8 6200 36 10 1500 47 100 20000 200 190 13000 110 10000 1100 1300 1500 200 200 2000 84 10000 4.2 64 26000 160 44 6200 200 440 88000 860 780 52000 490 44000 4700 5200 6200 880 880 8800 360 44000 18 280 ND 2.1 67 1.9 ND ND ND ND ND ND ND ND 1.2 ND ND 1.2 ND 5.9 140 1.5 ND ND 3.2 ND 42 ND ND ND 5.3 2 5.2 ND ND 2.2 ND 8.7 ND ND 1.8 100 ND ND 0.98 2 2.4 0.64 1.3 2.1 0.78 0.62 1.3 0.92 0.53 0.98 0.41 0.79 0.91 0.69 1.7 0.99 9.4 0.87 1.5 1.4 0.82 2.1 1.2 2 0.72 1.7 0.7 0.87 1.7 0.85 1.5 1.4 1.5 0.75 0.79 0.91 1.1 1.1 0.87 0.51 - ND 2.4 95 2.1 ND ND ND ND ND ND ND ND 1.1 ND ND 1.4 ND 5.9 190 1.8 ND ND 3.6 ND 37 ND ND ND 6.7 2.3 6.5 ND ND 2.4 ND 12 ND ND 1.5 90 ND ND 0.98 2 2.4 0.64 1.3 2.1 0.78 0.62 1.3 0.92 0.53 0.98 0.41 0.79 0.91 0.69 1.7 0.99 9.4 0.87 1.5 1.4 0.82 2.1 1.2 2 0.72 1.7 0.7 0.87 1.7 0.85 1.5 1.4 1.5 0.75 0.79 0.91 1.1 1.1 0.87 0.51 - ND 2.3 59 1.9 ND ND ND ND ND ND ND ND 1.1

2 1.3 0.92 0.53 0.98 0.41 0.79 0.91 0.69 1.7 0.99 9.4 0.87 1.5 1.4 0.82 2.1 1.2 2 0.72 1.7 0.7 0.87 1.7 0.85 1.5 1.4 1.5 0.75 0.79 0.91 1.1 1.1 0.87 0.51 - ND 2.3 59 1.9 ND ND ND ND ND ND ND ND 1.1 ND ND 1.3 ND 4.9 130 1.6 ND ND 3.2 ND 39 ND ND 4.5 5.6 2 5.6 ND ND 2.4 ND 8.7 ND ND 1.8 100 ND ND 0.98 2 2.4 0.64 1.3 2.1 0.78 0.62 1.3 0.92 0.53 0.98 0.41 0.79 0.91 0.69 1.7 0.99 9.4 0.87 1.5 1.4 0.82 2.1 1.2 2 0.72 1.7 0.7 0.87 1.7 0.85 1.5 1.4 1.5 0.75 0.79 0.91 1.1 1.1 0.87 0.51 - ND ND 9 ND ND ND ND ND ND ND ND ND 1.1 ND ND ND ND 2.4 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 1.3 ND ND 0.98 2 2.4 0.64 1.3 2.1 0.78 0.62 1.3 0.92 0.53 0.98 0.41 0.79 0.91 0.69 1.7 0.99 9.4 0.87 1.5 1.4 0.82 2.1 1.2 2 0.72 1.7 0.7 0.87 1.7 0.85 1.5 1.4 1.5 0.75 0.79 0.91 1.1 1.1 0.87 0.51 - - - - - 11.2 1.27 3.97 1.06 1.02 9.36 2.57 1.03 1.18 3.64 0 0 0 0 0 0 0 0 0 0 - 14.6 2.29 4.61 1.11 1.03 11.9 1.05 2.62 1.28 1.03 1.07 4.42 0 0 0 0 0 0 0 0 0 0 0 0 - 11.6 1.24 3.83 1.16 1.17 10.4 1.14 2.36 1.25 3.95 0 0 0 0 0 0 0 0 0 0 - ND - 0 - - NJ VOLATILE ORGANICS IN AIR NJ VOLATILE ORGANICS IN AIR-TIC No Tentatively Identified Compounds Butane 000106-97-8 Unknown Isobutane 000075-28-5 Nonane (C9) 000111-84-2 Acetaldehyde 000075-07-0 Decane (C10) 000124-18-5 Methyl Alcohol 000067-56-1 unknown alkane unknown alkane unknown alkane unknown alkane unknown benzene Pentane, 2-methyl000107-83-5 Pentane, 3-methyl000096-14-0 Butane, 2,3-Dimethyl000079-29-8 Cyclopentane, Methyl000096-37-7 Pentane 000109-66-0 * Comparison is not performed on parameters with non-numeric criteria. 1.8 Exceeded NJ-RIAS 1.9 Exceeded NJ-NRIAS NJ J NJ NJ NJ NJ J J NJ NJ NJ J NJ NJ NJ NJ J NJ NJ NJ NJ NJ NJ-NRIARS: New Jersey 2021 Non-Residential Indoor Air Vapor Intrusion Exposure Pathway Remediation Standards Criteria per Remediation Standards, last amended May 17, 2021. NJ-RIARS: New Jersey 2021 Residential Indoor Air Vapor Intrusion Exposure Pathway Remediation Standards Criteria per Remediation Standards, last amended May 17, 2021. NJ-INRAL: New Jersey 2021 Indoor Air Non-Residential Rapid Action Levels - ug/m3 Criteria per May 2021 Version 5.0 Guidance Document. NJ-IRRAL: New Jersey 2021 Indoor Air Residential Rapid Action Levels - ug/m3 Criteria per May 2021 Version 5.0 Guidance Document. NJ-NRIAS: New Jersey 2021 Non-Residential Indoor Air Remediation Standards -

AL: New Jersey 2021 Indoor Air Residential Rapid Action Levels - ug/m3 Criteria per May 2021 Version 5.0 Guidance Document. NJ-NRIAS: New Jersey 2021 Non-Residential Indoor Air Remediation Standards - ug/m3 Criteria per May 2021 Version 5.0 Guidance Document. NJ-RIAS: New Jersey 2021 Residential Indoor Air Remediation Standards - ug/m3 Criteria per May 2021 Version 5.0 Guidance Document. NJ-NRSGS: New Jersey 2021 Non-Residential Soil Gas Screening Levels - ug/m3 Criteria per May 2021 Version 5.0 Guidance Document. NJ-RSGS: New Jersey 2021 Residential Soil Gas Screening Levels - ug/m3 Criteria per May 2021 Version 5.0 Guidance Document. NJ J NJ NJ NJ NJ J NJ NJ NJ - -