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Johnson County, Kansas Environmental Department Protecting You and Your Environment |
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February Update on Recent Activities at APAC-Reno
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Week ending February 4, 2006The pipe construction for the APAC-Reno landfill gas collection system is underway with installation of the 6" main trunk line that connects all the smaller 3" lateral lines used to collect gas from each of the 25 landfill gas wells. A condensate knock out tank is also being installed and this tank is used to remove condensate liquid that gets into the pipelines. A 6" header pipe that connects all the piping and delivers the landfill gas to the asphalt plant is planned to be installed next week followed by connection of the 3" laterals. The installation of the landfill gas collection system requires excavation of 2-3' of soil cover to bury the gas lines and has resulted in some landfill odors. Lime dust is being added to the trenched lines to reduce odors as well as filling in the trenched lines as soon as the pipelines are completed. APAC continues to treat contact water in the lower east pond with caustic and hydrogen peroxide. All eight H2S air monitors are in place and functioning. Three of these monitors are next to the lower east pond and will be part of an alarm telemetry programming system which is expected to be functioning in a few weeks. All intermediate cover of compacted clay material with proper slopes that cover the south area of the landfill is completed. The hydrogeologic study continues with monitoring of water levels in the landfill wells. Week ending February 11, 2006During the week of February 5-11, 2006, installation of the gas collection system continued. Treatment of the water seeping from the landfill continued. The Kansas Department of Health and Environment, Bureau of Water, is currently reviewing possible changes to the water treatment system. Johnson County Environmental Department staff continued to download data from the eight hydrogen sulfide monitors located along the perimeter of the landfill. The installation of an automatic alarm system on the three hydrogen sulfide monitors by the seep area has been delayed for another week or two. Week ending February 18, 2006The landfill gas collection system continues with installation of the gas piping system. The gas blower is expected to be delivered in a few weeks. Some H2S odors have been noticed along 167th Street due to excavating the gas pipe lines in the landfill filling area. APAC has been directed to cover the gas lines as soon as installed. The gas pipelines should be buried and covered in one - two weeks. The contact water collection and treatment continues with the draining of the west and south seeps at 15 gpm into the lower east pond. The lower east pond is treated with sodium hydroxide and hydrogen peroxide as needed. Water level measurements within the monitoring water wells in the landfill have shown a drop in contact water level corresponding to the drainage flow of 15 gpm (gallons per minute). All the compacted clay cover over the landfilled areas is now in place, which provides for improved drainage of rainwater and minimizing H2S escaping through the cover. The air monitoring for the perimeter and source monitors is working well. APAC is still preparing the air monitoring telemetry system from the three source H2S meters located inside the landfill. Week ending February 25, 2006The landfill gas collection and treatment system is nearing completion with final installation of the gas piping system. The blower that will collect the landfill gas is on-site and installation will begin next week. JCED is working with APAC-Reno to construct a housing unit around the blower to reduce noise. The contact water collection and treatment continues with the west and south seeps flowing into the lower east pond at 15 gpm each. Treatment in of the lower east pond continues with sodium hydroxide and hydrogen peroxide. Hydrogen peroxide addition has been modified for direct mixing with the contact water at the source in the 6" collection line rather than adding to lower pond to allow for more efficient mixing of the chemical with the contact water. This has lowered hydrogen peroxide addition. More ideas are still being discussed to improve treatment efficiency. Sulfide concentration levels in west seep continue to decrease. The air monitoring program is working well with weekly downloads of the landfill perimeter H2S meters by the JCED. Detection levels have been very low with a few readings at or below 40 ppb (parts per billion). The three source monitors inside the landfill are operational and are expected to receive the telemetry software program next week to begin the automatic alarm system.
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