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Module 4 <br />0 <br />11 <br />• Pipes placed on top of the geomembrane base liner intercept and carry leachate to <br />perimeter sumps <br />• Sump with dedicated pump for Module 4 with automatic level control <br />• Volumetric flow meter for the leachate sump pump, indicating total gallons pumped and <br />instantaneous flow rate <br />• 10,000 gallon leachate storage tank <br />• Transfer pump (to fill water trucks, if needed) <br />• Return pump (to pump leachate back to the Modules, if needed) <br />• Infusion in upper elevations to receive leachate (primarily in Module 4) <br />Leachate is pumped from the leachate storage tank to an infusion point, a horizontal LFG <br />collector, or to the working face. Leachate is only returned to a Module with a liner constructed in <br />accordance with Subtitle D, such as of Module 3 and 4 and future Modules. <br />Leachate disposal facilities will be expanded and adjusted as needed to comply with applicable <br />permit and regulatory requirements. <br />2.3.2.3 Engineering and Chemical Properties of Soil <br />The engineering and chemical properties of the soil at the NCRC&SL are: <br />• Soils at depths between 0 and 20 feet below the ground surface are predominantly clays <br />and sandy silts. <br />• The average plasticity index ranges from a low of 4 to a high of 34 with an average of 17. <br />• Maximum dry density ranges from 99.4 to 117.5 pounds per cubic foot. <br />• Remolded hydraulic conductivities (95% relative compaction, 2 to 4% wet of optimum) <br />ranged from 4x1 OE -6 cm/sec to 1x10E-8 cm/sec. <br />North County RC&SL Page 10 of 69 Public Works/Solid Waste <br />Joint Technical Document County of San Joaquin — February 10, 2010 <br />