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Mr. Tom Horton AL Project 939-02.22 January 25, 1990 Page 2 stream of 350 tons per day is expected to increase by 3 percent each year through the service life. Although the waste stream will presumably not be altered by development of the new site, the scope of proposed facilities at NCSL is different from the existing facilities at the Harney Lane Landfill. Recently enacted legislation and mounting public concern for improved solid waste management practices have generated the need for more comprehensive landfill facilities; ones that provide broader services than just burying incoming refuse. ENTRANCE FACILITIES A variety of support facilities are being proposed for construction in Module 11 of the NCSL. For ease of discussion, these facilities are broadly defined under the general term of Entrance Facilities. Proposed Entrance Facilities, at NCSL, include an access road, a scale and gatehouse, and an office and full service maintenance complex. These elements are illustrated on Figure 1 and discussed in detail in the following paragraphs. Access Road There are five driving influences that contributed to developing the entrance road alignment. 1. The existing Harney Lane vertical alignment has a moderate crest located midway along the property-frontage, and a sag just east of that crest. To achieve optimum sight distance, the site entrance was located nearer the sag than the crest. Drainage control is enhanced by placing the entrance near the sag in Harney Lane. 2. The County would like to preserve the existing use of the rental property in the northeast comer of the site. Therefore, the proposed alignment has avoided that property. 3. The corridor identified for wetland mitigation occupies a large section of the northwest comer of the site. The proposed roadway alignment does not interfere with the use of this area. 4. An electrical power transmission line currently crosses the north portion of the site. The proposed access road alignment minimizes the impact on this transmission line by maintaining an adequate horizontal offset from existing towers, and by limiting the necessity for construction fill, which reduces vertical clearance below the existing conductors.