J_2024 05 09_West Orange Stormwater Management Plan

August 8, 2022 File No. 26.0092704.00 PSE&G – West Orange, NJ Page 14 Proactive by Design each test pit location within the existing fill materials at about 3 to 3.3-feet below the ground surface. At each location, the test failed to drain during the presoak period resulting in failed tests. Laboratory tube permeameter permeability tests were also performed on tube samples obtained from the test pits. The tube permeameter tests indicate that the clay loam and silt loam fill materials were relatively impermeable, with occasional permeable loam fill layers. The single ring infiltration and tube permeameter tests are summarized on the individual test pit logs. Chemical Testing: Three samples of the near surface soils were submitted to an NJDEP certified laboratory to determine pH, sulfates, chloride ion, electrical resistivity, redox potential, and sulfides. The test results pH are summarized on Plate 9. Based on American Concrete Institute ACI 318 guidelines, sulfate levels of less than 1,000 parts per million (ppm) indicate a negligible exposure for corrosion of concrete, and ACI recommends the use of Type I cement. The sulfate test results ranged from 34.9 to 90.2 ppm. The USDA guidelines indicate a pH of less than 5.5 for sandy soils or 5.0 for fine-grained soils are considered to have a high risk of corrosion potential for concrete. The pH test result ranged from 3.44 to 5.58. Therefore, based on the results of the tests, we would recommend that Type II cement be used. In order to evaluate the risk of uncoated ductile iron pipe to corrosion, the AWWA takes five parameters into consideration including electrical resistivity, pH, redox potential, sulfides and moisture content. Each category is assigned a point value, and if the total points are 10 or higher, that indicates the soil is corrosive to ductile iron pipe and protection is needed. The samples tested in SBH-1 and SBH-2 resulted An Equal Opportunity Employer M/F/V/H