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<br />North County Recycling Center & Sanitary Landfill Public Works/Solid Waste <br />First Semiannual 2024 Groundwater Monitoring 12 ©2024 COUNTY of San Joaquin. All Rights Reserved. <br /> <br />Facilities <br />The leachate facilities for each Area include: <br />ƒ Sump with dedicated leachate pump. The sump pumps are equipped with automatic <br />controls and a sump level indicator. <br />ƒ Volumetric flow meter for the sump pump, indicating total gallons pumped and flowrate <br />measuring dial. <br />ƒ Leachate storage tanks. These tanks are normally not in use but are available if leachate <br />cannot be returned to the refuse directly from the sump. <br />o Areas 1 and 3 sumps share one tank (3,000 gallons) <br />o Area 4 and 5 sumps share one tank (12,000 gallons). <br /> <br />The tanks have the following features: <br />o Float switches that activate alarms based on high or low level conditions. Under <br />high-level conditions, the leachate sump pumps are deactivated. This prevents <br />overflow of the tanks. <br />o Under low-level conditions, pumps that can remove leachate from the tanks are <br />deactivated, preventing the operation of these pumps with insufficient fluid. <br />o Transfer pumps at each leachate tank that can deliver leachate into a water <br />truck, if needed. <br />o Return pump at the Area 4 leachate tank delivers leachate to the infusion point or <br />into a water truck, if needed. <br /> <br />Permanent points of return of leachate to the refuse include three Deep Infusion Points (“dry” <br />wells), with two dry wells over Area 4 and one over Area 3 and Area 5. The highest elevation of <br />the base of Area 3 in this area is approximately 96 feet NAVD 88. The bottom of these Deep <br />Infusion Points (DIPs) are approximately at elevation 140 feet NAVD 88. Approximately 50 feet <br />of refuse in multiple lifts exists between the point of infusion and the base of the landfill. <br />Construction and alteration of the DIPs was reported in detail in the First Semester 2005 <br />Groundwater and Surface Water Monitoring Report. <br />Normal Operation <br />Leachate drains by gravity to the Area sumps from which it is pumped directly to the landfill <br />refuse per the WDRs. The sump pump operates automatically, based on leachate levels within <br />the sump. <br />Operation of any Area sump pumps is conditional upon sufficient water in the sump (indicated <br />by the level sensor on the pump) and available capacity in the associated leachate tank <br />(indicated by the float switch in the tank). <br />Control points for the sump pumps are: