ARCHIVED REPORTS_2014_1 - Laserfiche WebLink

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Indicated Depth Actual Depth Control Action inches (1) inches (1) Pump Off 10 53 Lined Area 1 Pump On 45 48 High Level Alarm(2) 50 13 Pump Off 10 83 Lined Area 3 Pump On 75 78 High Level Alarm(2) 80 13 Pump Off 8 32 (3) Lined Area 4 Pump On 18 42 High Level Alarm(2) 24 48 Note 1:"Indicated depth"is the reading of depth from the sensor located on the pump,approximately three inches above the inner surface of the sump pipe at the location of the pump (also see Note 3). Note 2:The high-level sump alarm is set to alarm at the upper lip of the leachate sump,thus alerting the operators before the one-foot leachate limit is exceeded at the floor of the Lined Area beyond the sump. Note 3:The leachate pump intake of Lined Area 4 is located 24 inches above the floor of the sump to avoid pulling soil from sump into the pump. In this semiannual period, leachate from all three Lined Areas was returned directly to the refuse of at approximately 160 ft NGVD, over approximately 120 feet of refuse compacted in multiple lifts. Data indicates that the leachate is being absorbed by the dryer refuse, and is not recirculating. Overwhelming of the LCRS system due to excessive recirculation is not indicated. Such indication would include the inability of a leachate sump pump to empty the sump. This condition was observed once, in 2003, when Area 4 was first installed. At that time, significant areas of that Area was lacking refuse, allowing rain water to quickly reach the LCRS without the opportunity to be absorbed by refuse. This situation was corrected by relocating the infusion of leachate to an area that contained more dry refuse. Overwhelming the capacity of the refuse to absorb leachate would be indicated by leachate seeps on the side of the fill in the vicinity of the infusion areas. This condition has not been observed. Leachate System Testing Testing the leachate system consists of monitoring the pumping rate of each sump pump monthly. Leachate pumps that are operating at the rate consistent with past performance are considered to be operating normally. The in-line filters at the pump intakes are replaced every one to two years when a diminished flow rate or increased headloss across the filter(pumping stations for Areas 1 and 3) is observed. Flow rate is calculated by the operator while observing the flow meter. Exposed leachate pipes are inspected for damage or disturbance once a month. North County RC&SL Public Works/Solid Waste Vt Semiannual 2014 Groundwater Monitoring 10 County of San Joaquin—July 31,2014