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 6 The Site is comprised of the 3.08 acre Lot 16 in Block 115 at the northeasterly side of Lakeside Avenue. Improvements at the DPW Site are comprised of three-wing structure with Office Wing, Repair Garage Wing and Storage Garage Wing. Asphalt paved parking areas are situated at the southwest and west sides of the DPW Site. Vehicle fueling stations are situated to the west and northwest portions of the DPW Site. Salt storage dome, exterior salt storage and equipment storage are situated at the east portion of the DPW Site. The West Orange Animal Control Facility is situated at the east side of the DPW Site along Watchung Avenue. Access to the DPW Site is achieved via driveways from Lakeside Avenue and Watchung Avenue. The surrounding area to the north and west, were historically part of the Thomas Edison industrial complex, specifically, the Edison Phonographic Works. 2.2 Regional Geology The Site is located in Essex County and lies entirely within the Triassic lowlands of the Piedmont Province. The Brunswick Formation, consisting of red-brown sandstone and Watchung Basalt underlie all of Essex County. A review of the Engineering Soil Survey of New Jersey, Report No. 2, Essex County, indicates that the general characteristics of the regional geology consist of unassorted, heterogeneous material, including clay, silt and sand, with varying percentages of gravel, cobbles and boulders. The Brunswick or Basalt Formation is overlain by non-residual deposits ascribed to the Wisconsin Glacier and are identified as ground morainic till. 2.3 Site Geology Site-specific geological information from previous subsurface explorations indicates that the Site is almost entirely underlain by approximately 1.5 to 6 feet of fill material consisting of brown fine to coarse sand, concrete and brick rubble, ash, slag, metal fragments, and some gravel. The fill material is underlain by a layer of red-brown fine to coarse sand, some silt and little gravel. An organic clayey silt and olive peat is present at depths ranging from 8 to 10 feet bsg. The organic clayey silt stratum is underlain by a layer of fine sand. 2.4 Regional Hydrogeology The Site is located within the Piedmont Province, which consists of primarily of lowland and gently

. The organic clayey silt stratum is underlain by a layer of fine sand. 2.4 Regional Hydrogeology The Site is located within the Piedmont Province, which consists of primarily of lowland and gently rolling hills above which rise the Watchung Mountains. The Brunswick Formation is the predominant formation in the region. The formation consists of inter-bedded brown, reddishbrown, sandstone. Three sets of gray to black basalt are intermixed with sandstone of the Brunswick Formation. Glacial deposits, consisting predominantly of till, overlay the rocks. P:\I00 CME7\West Orange\DPW 25 Lakeside Ave\VI Investigation 2023\VI letter Report\VI Letter Report - DPW West Orange - April 2023.docx