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wastes. According to the available hazardous waste manifests, the following hazardous wastes generated were identified to contain chlorinated solvents: a. UN1263 Waste Paint Related Materials (noted to contain Tetrachloroethylene and Trichloroethylene) was generated in 2009-2010 and 2020, ranging from 0.015 to 0.036 tons b. NA3082 Hazardous Waste (noted to contain Tetrachloroethylene and Halogenated Solvents) was generated in 2012, totaling 0.475 tons c. UN1993 Waste Flammable Liquids (noted to contain Halogenated Solvents) was generated in 2016-2022, ranging from 0.1 to 0.45 tons Additionally, AEI observed Chemlok 6224 and Endurabond 1-100 stored in 5 gallon containers within flammable cabinets in Buildings 3 and 4, which are used in the on-site rubber manufacturing operations.According to SIDS [safety data sheet] information for Chemlok 6224, this solvent contains small amounts of tetrachloroethylene(ranging from 0.1-0.9%of the total solvent mixture). In addition, the SIDS information for Endurabond 1-100 solvent solution states that trichloroethylene makes up approximately 25% of this mixture. Halogenated or chlorinated solvents are highly mobile chemicals that can easily accumulate in soil and soil gas, and migrate to groundwater beneath a facility. These solvents, even when properly stored and handled, can readily migrate into the subsurface as a result of small releases associated with on-site operations. Some previous soil sampling was conducted at the subject property in association with former USTs [underground storage tanks] and petroleum impacted soil; however, it was primarily restricted to TPH/BTEX [total petroleum hydrocarbons/benzene, toluene, ethylbenzene, xylenes] and did not include areas within the subject property buildings. Based on the duration of industrial use (approximately 74 years), at least partially operating prior to a time of regulatory oversight,documented use of chlorinated solvents, and limited nature of prior sampling activities, the long-term industrial use represents a REC." Based on available information, groundwater in the vicinity of the subject property is anticipated to be first encountered at a depth greater than 100 feet below ground surface(bgs)with inferred flow direction to the west-southwest. The subsurface is expected to consist of a varying combination of clay, silt, and sand from the ground surface to at least 5.5 feet bgs. Objective The objective of the project will be to evaluate the potential impact of petroleum hydrocarbons and volatile organic compounds (VOCs) to soil, soil gas, and/or indoor air as a consequence of a release or releases from the on-site industrial operations. To investigate the identified REC, Partner will conduct a Phase II Subsurface Investigation.The investigation scope will include the advancement of 13 borings (131 through B13) to facilitate the collection and analysis of soil and/or soil gas samples. Refer to the attached map for proposed sample locations. Page 2 PARTNER