ARCHIVED REPORTS_2013 - Laserfiche WebLink

Home Browse Search

In this semester, 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. ANNUAL FACILITY INSPECTION The facility was inspected to assess damage to the drainage control system, groundwater monitoring equipment in September 26, 2011. Standard Observations are attached. Generally,the site was found to be in excellent condition due to the ongoing drainage system maintenance by the site superintendent. Groundwater monitoring equipment remains in good working order. HISTORICAL TIME SERIES PLOTS AND STIFF DIAGRAMS Historical Time Series Plots are included with this report on CD. Constituents not detected are plotted at a value of half their respective detection limits in the Historical Time Series Plots. Note that Outliers were included in the plots as directed by RWQCB staff. Stiff diagrams are submitted semi annually and are included with this report on CD. The stiff diagrams submitted for the first semester indicate that well G-1 is a sodium-bicarbonate water type, whereas,the wells do not show a prominent cation with a prominent anion of bicarbonate. The dissimilarity in diagram shapes may be an indication of natural regional changes in groundwater quality conditions. North County RC&SL Public Works/Solid Waste 2nd Semester and Annual 2013 Groundwater Monitoring 15 County of San Joaquin—January 25,2014