J_2024 05 09_West Orange Stormwater Management Plan

PSE&G Mav 17.2011 Page 3 ranging from 13 to 14 feet below grade. The locations of the test borings and test pits performed for this study are shown on the Plot Plan, Plate 2. In addition MTA has previously performed test pits within the switching station. Copies of the previous exploration logs and plans showing their approximate locations are attached in Appendix I. All field work was performed under the direct technical supervision of a representative from MTA. Our representative located the test borings in the field from existing surface features and maintained continuous logs of the explorations as the work proceeded. After hand excavating for the first three feet, continuous split spoon samples were obtained to 15 feet below grade and at five foot intervals thereafter in general accordance with the procedures of the Standard Penetration Test (ASTM D-1586). Detailed descriptions of the encountered subsurface conditions are presented on the Logs of Borings, Plates 3A through 3E. The results of the test pits are presented on Plates 4A and 4B. The soils encountered in the borings were visually classified in general accordance with the procedures of the Unified Soil Classification System shown on Plate 5A, while the soils in the test pits were described in accordance with the USDA Soil Classification System presented on Plate 5B. All soil samples obtained from the borings and test pits performed for this study were brought to our office where they were further examined by a project manager in our soil mechanics laboratory. Laboratory tests consisting of natural moisture content determinations (ASTM D-2216), grain-size analyses (ASTM D-422), Atterberg Limits determinations (ASTM D-2318), soil box resistivity tests (ASTM G-187) and pH tests (ASTM G-51) were performed on selected samples to aid in their engineering classification and evaluation. The results of the moisture content tests are indicated on the individual test boring logs, while the mechanical grain-size analyses are shown on the Gradation Curves, Plates 6A and 6B. The results of the Atterberg limits determinations are