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

Bureau of Case Assignment &Initial Notice Re: Vapor Intrusion Investigation Report West Orange DPW 25 Lakeside Ave April 2023 Page 7 The bedrock of the Brunswick Formation is generally capable of sustaining moderate yields to wells. The Watchung basalt is capable of yielding only small quantities of water. Water occurs both under unconfined and confined conditions in these bedrock formations. The aquifers are anisotropic and water moves along the joints and fractures. 2.5 Site Hydrogeology A review of the results of the previous investigations indicates monitoring wells have been set in the overburden water bearing unit. Groundwater within this unit was encountered during the last sampling event at depths ranging from approximately 4.0 to 9.0 feet bsg and it appears to be under unconfined conditions. Lateral groundwater flow within the overburden aquifer was determined to be generally South-Southeast. 3.0 VAPOR INTRUSION INVESTIGATION CME’s personnel visited the Site on March 30, 2023, to investigate the building and to complete an indoor air quality survey within the building. The Site is currently improved with a single-story cinder block building (circa 1980) on a concrete slab foundation, includes an office area and a DPW maintenance area and storage garage. 1. Office Area: Offices, Dormitory/Waiting Room, Kitchen and Storage Room 2. DPW Garage - Maintenance area and storage garage Repair area with overhead-bay doors Exterior areas consist of asphalt driveways and parking lots on the southwestern and eastern side of the structure. The Site is bound to the north by the Former Barton Press Site (also former Edison complex), followed by Columbia Street and residential dwellings. The Site is bound to the west by the Former Barton Press Site (also former Edison Complex) followed by Main Street. The Site is bound to the south by Twin Towing followed by Lakeside Avenue and commercial properties including AWISCO (a welding supply company), and Joachim Driving School. The Site is bound to the east by Watchung Avenue followed by residential dwellings. During the period of March 31 and April 2, 2023, CME conducted a VI investigation at the Site. The VI investigation was performed to evaluate the potential impacts to indoor air quality as a result of volatile organic vapors emanating from groundwater plume around the building at the Site. P:\I00 CME7\West

tigation was performed to evaluate the potential impacts to indoor air quality as a result of volatile organic vapors emanating from groundwater plume around the building at the Site. P:\I00 CME7\West Orange\DPW 25 Lakeside Ave\VI Investigation 2023\VI letter Report\VI Letter Report - DPW West Orange - April 2023.docx