1. The engineering
report required pursuant to NAC 445A.9608 must include, without limitation, a
soils analysis performed by a qualified person approved by the Division or
other administrative authority, including, without limitation, a design
engineer, a soils scientist or a geologist. The soils analysis must include,
without limitation:
(a) Data from a
percolation test pursuant to NAC 445A.9668, from a minimum of two test holes in
the area of the proposed effluent absorption system, unless an alternative
investigation of soil characteristics pursuant to NAC 445A.967 is used. If an
alternative investigation of soil characteristics is performed, the results of
that investigation must be included in the soils analysis.
(b) Soil logs from at least one test pit
excavated to a minimum depth of 5 feet below the bottom of the proposed
absorption system. The soil logs must describe the soil in accordance with
sections 28 through 30, Figure 29-1, Table 29-1 and Appendix A of
Design Manual: On-site Wastewater Treatment and Disposal
Systems, as adopted by reference in NAC 445A.9592. The soil logs must
include notations relating to impervious barriers, bedrock, fractures, areas of
open solution, clay, caliche or other limiting factors. The depth to the
seasonal high groundwater, as observed as the surface of free water or as
indicated by mottling or historical documentation, must also be included in the
soil logs.
(c) Verification by the
design engineer, soils scientist or geologist of the depth of the high
groundwater and bedrock, areas susceptible to flooding, the ground slope and
the results of percolation tests, including, without limitation, a
morphological study of soil conditions with particular reference to soil color
and sequence of horizons. In addition:
(1) If
the natural soil condition has been altered by filling or other attempts to
improve wet areas, the Division or other administrative authority may require
the verification by the design engineer, soils scientist or geologist to
include observation of high groundwater levels under saturated soil
conditions.
(2) If the natural soil
condition has been altered by filling or other attempts to improve the
percolation rate of the soil, the Division or other administrative authority
may require the verification by the design engineer, soils scientist or
geologist to include a determination of whether the fill material is suitable
for an on-site sewage disposal system.
(d) The long-term acceptance rate of the
soil, as referenced in the table set forth in NAC 445A.9674.
(e) If required by the Division or other
administrative authority pursuant to paragraph (b) of subsection 3 of NAC
445A.9602, a groundwater mounding analysis.
2. The Division or other administrative
authority may require the design engineer to include in the engineering report
a nitrogen balance to demonstrate that the effluent will not cause any waters
of the State to exceed the maximum contaminant level of nitrate, and
groundwater samples from the installed monitoring wells must be obtained before
initiation of operation of the on-site sewage disposal system.
3. The engineering report may include any
other data determined by the design engineer to be relevant to the design
specifications of the proposed on-site sewage disposal system.
Added to NAC by
Environmental Comm'n by R194-07, eff. 8-26-2008
