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Ci ■ Then leachate from Module 3 is pumped until pumping stops or until the leachate tank is full. ■ Tank level is determined by observing the fluid level from port at top of tank. Module 4 Facilities The leachate facilities for Module 4 include: ■ Sump with dedicated pump for Module 4 ■ Volumetric flow meter for the leachate sump pump, indicating total gallons pumped and instantaneous flow rate Ci n. n 0 ■ A 10,000 gallon leachate storage tank ■ Transfer pump (to fill water trucks, if needed) ■ Return Pump (to pump leachate back to one of the Modules allowed to receive leachate, if needed) Operation Leachate drains by gravity to the Module 4 sump, from which it is either pumped to the 10,000 - gallon storage tank or directly to the landfill refuse per the WDRs. The sump pump operates automatically, based on leachate levels within the sump. The leachate pump intake is located 24 inches above the floor of the sump to avoid pulling soil from sump into the pump. Control points for the pump are: Indicated Depth inches Actual Depth inches Pump Off: 8 32 Pum On: 18 42 High Level Alarm: 24 48 Operation of the pump is conditional upon sufficient water in the sump and available capacity in the leachate tank. The high level alarm is set to alarm at the upper lip of the sump, thus alerting the operators before the one -foot leachate limit is exceeded at the Module floor beyond the sump. The leachate storage tank is steel, of double -walled construction. The tank is provided with two sensors: ! A high level sensor, which will activate an alarm and deactivate the sump pump if the leachate level exceeds a set level. This feature prevents the overflow of the tank. ■ A low level sensor, which deactivates the transfer and return pumps, thus preventing either of those pumps from being operated with insufficient water. North County RCSL 11 Public Works/Solid Waste 2nd Semester and Annual 2005 Groundwater Monitoring County of San Joaquin — January 24, 2006