J_2024 05 09_West Orange Stormwater Management Plan

August 8, 2022 File No. 26.0092704.00 PSE&G – West Orange, NJ Page 9 Proactive by Design controlled compacted fill to achieve the final desired subgrades. However, it should be understood that if existing fill is left in-place, even with a recompacted subgrade, some post-construction settlement could potentially be experienced. Controlled compacted fill or backfill should consist of dry, suitable portions of the excavated on-site soils or imported granular soils placed under the observation of the inspecting geotechnical engineer. The near surface excavated fill is expected to consist primarily of silts and clays with occasional sandier zones. The sandier soils, if encountered, would be considered suitable for reuse as controlled compacted fill and backfill provided they are at and maintained at moisture contents which would allow them to be properly compacted. The silty and clayey soils would be poorly suited for reuse due to their moisture sensitive nature. Variations in the nature and composition of the fill materials present at the site should be anticipated. A determination regarding the suitability of excavated fill materials for reuse as structural backfill adjacent to the foundations should be made at the time of construction by a qualified geotechnical engineer. Weathered basalt was encountered at depths ranging from about 15 to 28 feet below the ground surface and as such would not be a concern for the anticipated shallow foundations. Imported fill, if required, should consist of uncontaminated relatively well-graded sand and gravel soils containing less than 15 percent by weight of material passing a U.S. Standard No. 200 sieve and a maximum particle size of 4 inches. Documentation of the environmental quality of the fill should include a written certification from the fill supplier stating that the fill is virgin material from a commercial or non-commercial source. An Equal Opportunity Employer M/F/V/H