A06_ATTACHMENT_003_-_Project_Plans.pdf

These are construction drawings for wastewater system rehabilitation at Newfound Gap Overlook in Great Smoky Mountains National Park (PMIS #304884). The project, designed by the National Park Service under the Department of the Interior, involves comprehensive upgrades to the existing wastewater disposal infrastructure serving the overlook facility.

The existing system consists of two fields with 15 40-foot pressure dosed chamber lines, 300 dosing chambers, and 290 blank chambers totaling 590 chambers, utilizing Infiltrator System Inc. QUICK4 E036 STRAIGHTLOCK chambers with 4' x 4' grid dosing and 1' minimum cover depth. The proposed rehabilitation includes installation of new duplex dosing siphons in existing box F, replacement of existing frame and gate on both structures, removal of existing plastic valve box lids with cast iron lids for all valve boxes, and installation of a new 5,000 gallon septic tank with related piping and infrastructure. The design incorporates chain link fence details with vinyl-coated steel materials, utility pipe trenches with non-native embedment material and acceptable stone, manhole details with flow diverters, and standard concrete box installations. Construction specifications require contractor equipment cleaning prior to park entry, approval of staging areas, limitations on hay and straw use, coordination with park operations including closure of the comfort station between December 1 and April 15, tree removal coordination, and compliance with North Carolina Department of Environmental Quality wastewater installation requirements as a licensed utility contractor. The construction drawings include site plans, topographic surveys, plan and profile views, detailed sections for dosing tanks, fence installations, and miscellaneous structural details with specific material callouts and dimensional specifications throughout.