J_2024 05 09_West Orange Stormwater Management Plan

August 8, 2022 File No. 26.0092704.00 PSE&G – West Orange, NJ Page 4 Proactive by Design borings were visually described in general accordance with the Unified Soil Classification System shown on Plate 5, while the soils encountered in the test pit excavations were described using the USDA Soil Classification Chart (typically used for stormwater purposes) shown on Plate 6. The rock type and general quality of the rock samples from the cores obtained in the borings are visually described in accordance with the Engineering Rock Classification and Core Description Chart shown on Plate 7. All soil and rock samples were brought to our office where they were further examined in our soil mechanics laboratory. A geotechnical laboratory testing program consisting of mechanical grain-size analyses, natural moisture content determinations, tube permeameter permeability, and soil box resistivity tests were performed on selected samples to assist in estimating and evaluation of their engineering properties. The results of the mechanical grain-size tests are presented on Plates 8A and 8B, Gradation Curves. The results of the natural moisture content determinations and laboratory tube permeameter permeability tests are shown on the appropriate boring and test pit logs. In addition, three samples of the near surface soils were submitted to an NJDEP certified laboratory to perform testing for pH, sulfates, chloride ion, electric resistivity, redox potential, and sulfides. The results of the chemical tests and GZA soil box resistivity tests are presented on Plate 9. Rock core samples were also submitted to an independent laboratory for unconfined compressive strength testing, the results of which are attached in Appendix II. In addition, GZA sent samples collected for geothermal testing to an outside laboratory, Geotherm USA. The geothermal report is attached as Appendix III to this report. As discussed with the engineering team, An Equal Opportunity Employer M/F/V/H