J_2024 05 09_West Orange Stormwater Management Plan

August 8, 2022 File No. 26.0092704.00 PSE&G – West Orange, NJ Page 10 Proactive by Design Any controlled compacted fill and backfill should be placed at appropriate moisture contents and in layers of no more than 12 inches in loose thickness. All controlled fill and backfill should be compacted to at least 95 percent of its maximum dry density as determined by the ASTM D-1557 test procedure. Backfill placed and compacted using manual equipment in confined areas such as foundation or utility trench excavations should be spread in layers of 6 to 8 inches or less in loose thickness as necessary to achieve the required compaction. Construction excavations should be performed in accordance with the applicable safety codes, including the latest OSHA Excavation Regulations. Based on the soils encountered in the test pits and borings, it is our opinion that the natural soils and fill are typical of Type "C" soils as defined by the OSHA Excavation Regulations. It should be the contractor’s responsibility to evaluate and provide a properly designed excavation support system, maintain safe excavations at all times, and prevent undermining of or damage to nearby existing structures and equipment to remain, if any. The contractor should be responsible for any damage caused by their work. Shallow Foundation Design Criteria: Following the site preparation procedures outlined above, it is our recommendation that equipment may be supported by conventional spread foundations that derive their support from the undisturbed natural soils, controlled compacted fill or stone backfill placed over the undisturbed natural soils in accordance with our above recommendations. Foundations for the proposed new improvements could be designed to impose maximum allowable net bearing pressures of up to 4,000 pounds per square foot. All foundations should extend to a depth of at least 3 feet below the adjacent finished exterior grade to provide frost protection. An Equal Opportunity Employer M/F/V/H