AG 1994 07 05 - Laserfiche WebLink

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Section 1 Sumrnao/ Report for ground water contamination in the future. Given that all of the nearby residences are on wells, this is of greater concern than it would be if the area near the landfill was served by a public water distribution system. The underlying ground water table and the drainage feature which originates on-site and bi-sects the site, appear to be the most significant nearby environmental receptors. The location of the landfill meets one of the So]3d Waste Section's most important landfill siting criteria; it is located adiacent to a ground water discharge feature. 1.3 Design of the MSWLF Unit The existing and active MSWLF unit at the Cabarrus County Landfill is not constructed with a base liner system. Cabarrus County subrrdtted a vertical expansion application for the site to the Solid' Waste Section in 1986. The County continues to operate in accordance with that plan, however, the Subtitle D restriction on lateral expansions and the State's 1998 deadline for closing unlined landfills wi21 not allow the County to fully utilize all of the capacity designed into the vertical expansion. The vertical expansion design has been re-designed to account for the restriction of further lateral expansion. 1.4 Age of the MSWLF Unit The Cabarrus County Landfill was originally permitted in 1969 and operations began in 1970. Operations began on the east side of a central drainage feature which originates on and runs through the site. The County originally leased this property and had to take ownership of it by condemnation a few years ago after a housing development was planned for the property. When operations were complete in what is now called "the old fill area", operations moved to the west side of the central drainage feature. The landfill in this area was orig4nally designed as consecutive trenches oriented east-west. These east-west trenches were constructed by the County beginning at the north end of the site. The trenches were constructed side-by-side from north to south. While constructing the first of the last three trenches at the site, the County's vertical expansion application was approved. Before entering the trench, the County began a vertical expansion at the northern end of the site. The vertical expansion of the trenches was completed in April of 1993 ahead of the effective date of the Subtitle D regulations. The County then moved into the previously constructed trench. The County proceeded to complete the first lift in the trench before the October 9, 1993, deadline for lateral expansions, and continues to vertically expand this last trench. The Operational Drawings call for the vertical expansion of this trench to tie into the recently completed vertical expansion. It is expected that the remaining capacity in the site will last until 1998 and/or until a new lined landfill is permitted and constructed in accordance with the new Solid Waste Management Rules. CDM Camp Dresser & McKee 1-2