J_2024 05 09_West Orange Stormwater Management Plan

January 17, 2023 File No. 26.0092704.00 PSE&G 80 Park Plaza, T-13 P.O. Box 570 Newark, New Jersey 07101 Attention: Mr. Matthew Cieri Civil Project Engineer Report Addendum Supplemental Test Pits and Permeability Testing West Orange Switching Station Lifecycle Project West Orange, Essex County, New Jersey PSE&G Introduction This report addendum presents the results of five additional test pits and related permeability testing performed for the West Orange Switching Station Lifecycle Project at the West Orange Switching Station located at 341 Mount Pleasant Avenue in West Orange, Essex County, New Jersey. The subject site is identified as Block 155, Lot 26.01 on the local tax map. Background Information GZA previously performed a subsurface investigation for the proposed Lifecycle project, the results of which was presented in our report dated August 8, 2022. Following completion of the investigation, five additional stormwater test pits were requested along the eastern edge of the site and are the subject of this addendum. Discussion On January 4th through January 6th, 2023, our representative visited the site and observed the excavation of the five requested additional test pits which have been identified as TP-201 through TP-205. The test pits were excavated by PSE&G’s contractor (Furino & Sons) and extended to depths of approximately 6 feet to 10 feet beneath the existing surface levels (bgs). The approximate test pit locations are shown along with the prior explorations on the Plot Plan, Plate 1. Detailed descriptions of the encountered subsurface conditions are presented on the Logs of Test Pits, Plates 2A through 2E. Test Pit 201 encountered 4-inches of gravel at the ground surface, while the other four test pits encountered 1 to 4 inches of topsoil at the ground surface. Silty and sandy clay loam or loam fill materials were encountered in Test Pits 201, 204, and 205. The fill was An Equal Opportunity Employer M/F/V/H