Engineering plans. Unless otherwise
specified in this chapter, engineering plans for all MSWLF units must be
submitted using the following format:
(iii) The preliminary engineering plans
relating the project to its environmental setting must include:
(A) A regional plan or map (having a minimum
scale of 1:62,500) and indicate directions and distances to airports within six
miles (ten kilometers) of the facility;
(B) A vicinity plan or map (having a minimum
scale of 1:24,000) that shows the area within one mile (1.6 kilometers) of the
property boundaries of the facility in terms of, the existing and proposed
zoning and land uses within that area; and residences, public and private water
supply wells, known private water supply aquifers, sole source aquifers,
groundwater management areas, well-head protection zones, special protection
areas and surface waters (with quality classifications), access roads, bridges,
railroads, airports, historic sites, and other existing and proposed man-made
or natural features relating to the facility; and
(C) An overall site plan (having a minimum
scale of 1:2,400 with five foot (or one meter) minimum contour intervals) that
must show the landfill's property boundaries (as certified by an individual
licensed to practice land surveying in the state of Washington), offsite and
onsite utilities (such as electric, gas, water, storm, and sanitary sewer
systems) and right of way easements; the 100-year flood plain, wetlands,
Holocene faults, unstable areas; the names and addresses of contiguous property
owners; the location of soil borings, excavations, test pits, gas venting
structures, wells (including down-gradient drinking water supply wells within
two thousand feet (six hundred ten meters) of the property boundary),
lysimeters, piezometers, environmental and facility monitoring points and
devices (with each identified in accordance with a numbering system acceptable
to the jurisdictional health department and whose horizontal location are
accurate to the nearest 0.5 foot (0.15 meter) and all orthometric evaluations
should be related to a vertical benchmark based on the North American vertical
datum of 1988 (NAVD88) and be established to 3rd order classification standards
per federal geodetic control committee, as measured from the ground surface and
top of well casing), benchmarks and permanent survey markers, and onsite
buildings and appurtenances, fences, gates, roads, parking areas, drainage
culverts, and signs; the delineation of the total landfill area including
planned staged development of the landfill's construction and operation, and
the lateral and vertical limits of previously filled areas; the location and
identification of the sources of cover materials; the location and
identification of special waste handling areas; a wind rose; and site
topography with five foot (or one meter) minimum contour intervals.
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Note:
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All horizontal locations must be based upon a control
station related to a horizontal datum specified in chapter 58.20 RCW and
chapter 332-130 WAC (NAD.83).
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(D)
Detailed plans of the landfill that clearly show in plan and cross-sectional
views, the original, undeveloped site topography before excavation or placement
of solid waste; the existing site topography (if different from the original,
undeveloped site topography) including the location and approximate thickness
and nature of any existing solid waste; the seasonal high groundwater table;
generalized geologic units; known and interpolated bedrock elevations; the
proposed limits of excavation and waste placement; the location and placement
of each liner system and of each leachate collection system, locating and
showing all critical grades and elevations of the collection pipe inverts and
drainage envelopes, manholes, cleanouts, valves, sumps, and drainage blanket
thicknesses; all berms, dikes, ditches, swales and other devices as needed to
divert or collect surface water runon or runoff; the final elevations and
grades of the landfill cover system including the grading and gas venting
layer, low permeability barrier, topsoil layers; the system used for monitoring
and venting the decomposition gases generated within the landfill; groundwater
monitoring wells; geophysical and geochemical monitoring devices or structures;
leachate storage, treatment and disposal systems including the collection
network, sedimentation ponds and any treatment, pretreatment, or storage
facilities; typical roadway sections, indicating the pavement type, dimensions,
slopes and profiles; the building floor plans, elevations, appurtenances; and
plans detailing the landfill entrance area including gates, fences, and
signs.