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Robert McClellon <br /> January 11, 2000 <br /> Page 2 <br /> IMPLEMENTED MODIFICATIONS <br /> The modifications to the landfill gas system were aimed at increasing the available vacuum to the <br /> highest gas-producing wells (north half). The modifications will be combined with a strategy of <br /> well balancing to direct vacuum to the north. <br /> The previous work plan suggested installing a second eight-inch header pipe parallel to the <br /> existing header that runs from the flare compound to the landfill. It was proposed that the second <br /> header would be connected to the second blower on the flare pad. In essence, this would have <br /> both blowers running at once, one for each half of the landfill. Through calculations, it was <br /> determined that the back-pressure produced by this method would be too severe for the flare and <br /> would not produce a significant vacuum increase. <br /> The implemented strategy included connecting the two blowers in series rather than in parallel. <br /> This involved some minor pipe work at the flare compound and blower repairs. The pipe work <br /> was completed in mid-December 1999, while the blower repairs were completed on <br /> January 4, 2000. The modifications have dramatically increased available vacuum to all areas of <br /> the landfill. The gas wells farthest to the north have seen vacuum pressures as high as 10 inches <br /> of water, whereas prior to modifications, one inch was common. <br /> The County is hopeful that the modifications performed will bring perimeter gas monitoring <br /> probes into compliance. The next quarterly monitoring event will be performed in January 2000. <br /> If you have any questions regarding this issue, please call me at Extension 8-3066. <br /> WJ:rh <br /> N:\WES\HL\GAS\VWLNREV <br /> c: Scott Walker, California Integrated Waste Management Board <br /> LA 11458 <br />