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<br />North County Recycling Center & Sanitary Landfill Department of Public Works/Solid Waste <br />First Semiannual 2025 Groundwater Monitoring Report ©2025 COUNTY of San Joaquin. All Rights Reserved <br /> 18 <br />Construction and alteration of the DIPs was reported in detail in the First Semester 2005 <br />Groundwater and Surface Water Monitoring Report. <br />9.2 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: <br /> Control Action Indicated Depth <br />inches (1) <br />Actual Depth <br />inches (1) <br />Lined Area 1 (L1) <br />Pump Off 10 13 <br />Pump On 45 48 <br />High Level Alarm (2) 50 53 <br /> <br />Lined Area 3 (L3) <br />Pump Off 10 13 <br />Pump On 75 78 <br />High Level Alarm (2) 80 83 <br /> <br />Lined Area 4 (L4) <br />Pump Off 8 11 <br />Pump On 32 36 <br />High Level Alarm (2) 42 48 <br /> <br />Lined Area 5 (L5) <br />Pump Off 12 12 <br />Pump On 23 23 <br />High Level Alarm (2) 35 35 <br /> <br />Note 1: “Indicated depth” is the reading of depth from the sensor located on the pump, <br />approximately three inches above the inner surface of the sump pipe at the location of the pump <br />(also see Note 3). <br />Note 2: The high-level sump alarm is set to alarm at the upper limit of the leachate sump, thus <br />alerting the operators before the one-foot leachate limit is exceeded at the floor of the Lined Area <br />beyond the sump. <br />In this semiannual period, leachate from Lined Areas was returned directly to the refuse at <br />approximately 160 feet above mean sea level, over approximately 120 feet of refuse compacted <br />in multiple lifts.