Indiana Administrative Code
Title 329 - SOLID WASTE MANAGEMENT DIVISION
Article 10 - SOLID WASTE LAND DISPOSAL FACILITIES
Rule 15 - Municipal Solid Waste Landfills; Plans and Documentation to be Submitted with Permit Application
Section 15-8 - Calculations and analyses pertaining to landfill design
Universal Citation: 329 IN Admin Code 15-8
Current through September 18, 2024
Authority: IC 13-14-8-7; IC 13-15; IC 13-19-3
Affected: IC 13-20; IC 36-9-30
Sec. 8.
(a) The applicant shall provide calculations and analyses pertaining to the design of the proposed MSWLF unit, if applicable, and if necessary as determined by the commissioner, to indicate that the proposed design complies with the design requirements of 329 IAC 10-17. Any required calculations must be accompanied by a discussion of methods, assumptions, and the references used. Calculations that may be required include the following:
(1) A transmissivity, in plane hydraulic
conductivity, calculation or an assessment based on the maximum compressive
load placed above the geosynthetic, using a minimum safety factor of ten (10),
when a geosynthetic material is used for the drainage layer. In addition, the
long term creep impact on the transmissivity of the geosynthetic must be
evaluated using a minimum safety factor of five (5).
(2) A permitivity, cross-plane hydraulic
conductivity, calculation using a minimum factor of safety of fifty (50), when
a geosynthetic material is used for the drainage layer.
(3) A filter-retention calculation or
assessment when a geosynthetic material is used for the drainage
layer.
(4) A tensile stresses
calculation to evaluate stresses generated during the construction and
operation of the interior of the side slope of the proposed MSWLF unit. A
minimum safety factor of five (5) on yield is required.
(5) A filter-clogging calculation to evaluate
the influence of retained soil particles on the permitivity of a geotextile or
geonet. Also, a gradient ratio test or a hydraulic conductivity ratio test, as
appropriate, must be performed in accordance with test standards specified in
329
IAC 10-17-17.
(6) A localized subsidence calculation, if
applicable, to evaluate the strains induced in the geomembrane used for the
liner system and for final cover.
(7) A stability of final cover calculation to
evaluate the likelihood and extent to which final cover components may slide
with respect to each other. A minimum safety factor as outlined in Table 1 of
this section is required.
(8) A
geosynthetic anchor or pull-out anchorage calculation or assessment to evaluate
the anchoring capacity and stresses in a geomembrane. A minimum safety factor
of one and two-tenths (1.2) is required. An anchor must provide sufficient
restraint to hold a geosynthetic liner in place, but should not be so rigid or
strong that the geosynthetic liner will tear before the anchor
yields.
(9) A settlement potential
calculation to estimate the total and differential settlement of the foundation
soil due to stresses imposed by the liner system, in-place waste, daily cover,
intermediate cover, equipment usage, and final cover.
(10) A bearing capacity and stability
calculation to estimate the load bearing capacity and slope stability of the
foundation soil during construction. A minimum safety factor of two (2.0) is
required for a static condition.
(11) The uplift pressure or hydrostatic pore
water pressure must be evaluated based on site-specific conditions.
(12) A waste settlement analysis to assess
the potential for the final cover system to stretch due to total and
differential settlement of the solid waste. If there is a lack of documented
settlement of the solid waste, a value of approximately seven percent (7%) to
fifteen percent (15%) of the solid waste height may be used for this
calculation.
(13) A wind uplift
force calculation or an assessment to provide an indication that wind uplift
will not damage the geomembrane during installation.
(14) A wheel loading calculation to indicate
that the amount of wheel loading of construction equipment will not damage the
liner system.
(15) A puncture of
geomembrane calculation to indicate that the amount of down drag force induced
by the leachate collection sumps and manhole with vertical standpipe settlement
will not cause failure of the underlying liner system. A minimum safety factor
of two (2.0) on tensile strength at yield is required.
(16) An erosion calculation to indicate that
the erosion rate will not exceed five (5) tons per acre per year, as is
required under
329
IAC 10-22-7(c)(3).
(17) Pipe calculations to assess the leachate
collection piping for deflection, buckling, and crushing.
(18) If applicable, or if required under
329 IAC
10-16-5(b), an analysis of the effect
of seismic activity on the structural components of the landfill.
(19) A peak flow calculation to identify
surface water flow expected from a twenty-five (25) year storm.
(20) A calculation to identify the total
run-off volume expected to result from a twenty-five (25) year, twenty-four
(24) hour precipitation event.
(21)
A chemical resistance evaluation to demonstrate that the leachate collection
and removal system components are chemically resistant to the waste and the
leachate expected to be generated.
(22) A clogging evaluation to demonstrate
that the system as designed will be resistant to clogging throughout the active
life and post-closure period of the MSWLF.
(23) A slope stability analysis that follows
the requirements outlined in Table 1 of this subdivision. Any geosynthetic
materials installed on landfill slopes must be designed to withstand the
calculated tensile forces acting upon the geosynthetic materials. The design
must consider the minimum friction angle of the geosynthetic with regard to any
soil-geosynthetic or geosynthetic-geosynthetic interface.
TABLE 1
| Minimum Values of Safety Factors for Slope Stability Analyses for Liner and Final Cover Systems | ||
| Uncertainty of Strength Measurements | ||
| Consequences of Slope Failure | Small1 | Large2 |
| No imminent danger to human life or major environmental impact if slope fails | 1.25 (1.2)* | 1.5 (1.3)* |
| Imminent danger to human life or major environmental impact if slope fails slope fails | 1.5 (1.3)* | 2.0 or greater (1.7 or greater)* |
1 The
uncertainty of the strength measurements is smallest when the soil conditions
are uniform and high quality strength test data provide a consistent, complete,
and logical picture of the strength characteristics.
2 The uncertainty of the strength
measurements is greatest when the soil conditions are complex and when the
available strength data do not provide a consistent, complete, and logical
picture of strength characteristics.
*Numbers without parentheses apply to static conditions and those within parentheses apply to seismic conditions.
(24) Any additional calculation
determined by the commissioner to be necessary to ascertain whether the
proposed design complies with the requirements of this article.
(b) Test standards for MSWLF liner systems are listed in 329 IAC 10-17-17.
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