Laserfiche WebLink
® Control Action Indicated Depth Actual Depth <br /> inches (1) inches 1 <br /> Pump Off 50 53 <br /> Area 1 Pump On 45 48 <br /> High Level Alarm(2) 10 13 <br /> Pump Off 80 83 <br /> Area 3 Pump On 75 78 <br /> High Level Alarm(2) 10 13 <br /> Pump Off 8 32 (3) <br /> Area 4 Pump On 18 42 <br /> High Level Alarm(2) 24 48 <br /> Note 1:"Indicated depth"is the reading of depth from the sensor located on the sump,approximately three inches <br /> above the pump (also see Note 3). <br /> Note 2:The high-level sump alarm is set to alarm at the upper lip of the leachate sump,thus alerting the operators <br /> before the one-foot leachate limit is exceeded at the Area floor beyond the sump. <br /> Note 3:The leachate pump intake of Area 4 is located 24 inches above the floor of the sump to avoid pulling soil <br /> from sump into the pump. <br /> In this semester, leachate from all three Areas was returned directly to the refuse of at approximately <br /> 160 ft NGVD, over approximately 120 feet of refuse compacted in multiple lifts. Data indicates that the <br /> leachate is being absorbed by the dryer refuse, and is not recirculating. <br /> Overwhelming of the LCRS system due to excessive recirculation is not indicated. Such indication <br /> would include the inability of a leachate sump pump to empty the sump. This condition was observed <br /> once, in 2003, when Area 4 was first installed. At that time, significant areas of that Area was lacking <br /> refuse, allowing rain water to quickly reach the LCRS without the opportunity to be absorbed by refuse. <br /> This situation was corrected by relocating the infusion of leachate to an area that contained more dry <br /> refuse. <br /> Overwhelming the capacity of the refuse to absorb leachate would be indicated by leachate seeps on the <br /> side of the fill in the vicinity of the infusion areas. This condition has not been observed. <br /> Leachate System Testing <br /> Testing the leachate system consists of monitoring the pumping rate of each sump pump. Leachate <br /> pumps that are operating at the rate consistent with past performance are considered to be operating <br /> normally. The in-line filters at the pump intakes are replaced every one to two years when a diminished <br /> flow is observed. Flow rate is calculated by the operator while observing the flow meter. Exposed <br /> leachate pipes are inspected for damage or disturbance once a month. <br /> North County RC&SL Public Works/Solid Waste <br /> 2"'Semester and Annual 2012 Groundwater Monitoring 14 County of San Joaquin—January 15,2013 <br />