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North County RC&SL Page 10 of 64 Public Works/Solid Waste Joint Technical Document County of San Joaquin – Revised July 14, 2025 Area 5A, 5B & 6 have the same sump and share the Area 4 leachate storage tank. All leachate is pumped from a sump or tank to an infusion point. Leachate is only returned to an area with a liner constructed in accordance with Subtitle D, such as areas 3-6 and future areas. Leachate is not returned to area 1. Leachate disposal facilities will be expanded and adjusted as needed to comply with applicable permit and regulatory requirements. 2.3.2.3 Engineering and Chemical Properties of Soil The engineering and chemical properties of the soil at the NCRC&SL are: • Soils at depths between 0 and 20 feet below the ground surface are predominantly clays and sandy silts. • The average plasticity index ranges from a low of 4 to a high of 34 with an average of 17. • Maximum dry density ranges from 99.4 to 117.5 pounds per cubic foot. • Remolded hydraulic conductivities (95% relative compaction, 2 to 4% wet of optimum) ranged from 4x10-6 cm/sec to 1x10-8 cm/sec. 2.3.2.4 Engineering and Chemical Properties of Waste The engineering properties of municipal solids waste have been collected from literature. Physical properties include density, moisture content, particle size and distribution, field capacity, and porosity. Density varies because of the large variety of wastes, the degree of compaction, state of decomposition, and the amount of daily cover and total waste. In general, un-compacted waste densities can vary between 110 pounds per cubic yard (CY) for plastic to 550 pounds per CY for ferrous metals. NCRC&SL refuse placement density calculations indicate that approximately 1300 pounds of refuse is placed in the landfill for each cubic yard airspace consumed by refuse and cover.. The chemical properties of wastes are important if evaluating recovery options, especially when burned for energy recovery, which is not contemplated for this site at this time. The typical proximate values (moisture, volatile matter, and ash) as well as densities are shown in Table 3.