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<br />North County Recycling Center & Sanitary Landfill Public Works/Solid Waste <br />First Semiannual 2024 Groundwater Monitoring 13 ©2024 COUNTY of San Joaquin. All Rights Reserved. <br /> <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, approximately three inches <br />above the inner surface of the sump pipe at the location of the pump (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 alerting the operators <br />before the one-foot leachate limit is exceeded at the floor of the Lined Area beyond the sump. <br /> <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. Data indicates that the leachate is being absorbed by the dryer refuse, and is not <br />recirculating. <br />Overwhelming of the LCRS system due to excessive recirculation is not indicated. Such <br />indication would include the inability of a leachate sump pump to empty the sump. This condition <br />was observed once, in 2003, when Area 4 was first installed. At that time, significant portions of <br />Area 4 were lacking refuse, allowing rain water and recirculated leachate to quickly reach the <br />LCRS without the opportunity to be absorbed by refuse. This situation was corrected by <br />relocating the infusion of leachate to an area that contained more dry refuse. <br />Overwhelming the capacity of the refuse to absorb leachate would be indicated by leachate <br />seeps on the side of the fill in the vicinity of the infusion areas. This condition has not been <br />observed. <br />Leachate System Testing <br />Testing of the leachate system consists of monitoring the pumping flowrate of each sump pump <br />monthly. Leachate pumps that are operating at the rate consistent with past performance are <br />considered to be operating normally. The in-line filters at the pump intakes are cleaned every <br />time when a diminished flow rate or increased head loss is observed. Flow rates are calculated