Septic Installer Test For Washington State (WOSSA)
EXAM (Latest 2026) || Most Recent Exam 2026|2027
Actual Complete Real Exam Questions And Correct
Answers (Verified Answers) Already Graded A+ |
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Mound Systems: - ANSWER-Mounds are an excellent treatment
and dispersal choice on appropriate sites, but they are not very
forgiving. Special attention must be given to siting, design, pre-
construction planning, site preparation, filter media selection,
construction and maintenance of these systems. Quality
control throughout the process cannot be overemphasized.
Mound Systems: - ANSWER-Mound system design has been
developed for those site conditions in which adequate vertical
separation is not available between the bottom of a SSAS and a
restrictive layer, or a water table.
Mound system design addresses the following site and soil
conditions: - ANSWER-Permeable or slowly permeable soils
with a high water table. Excessively permeable soils over
unprotected aquifers or shallow permeable soils overlying
excessively permeable soils or creviced or porous bedrock.
Slowly permeable soils without a high water table
Mound System: Performance Criteria - ANSWER-When properly
sited, designed, installed, operated and maintained, a mound
,system consistent with these recommended standards and
guidance is expected to achieve treatment performance equal
to Treatment Level B or C.
Mound System: Performance Criteria - ANSWER-When
preceded by a treatment product listed on the List of
Registered On-site Treatment and Distribution Products as
meeting Treatment Level B, a mound system (properly sited,
designed, installed, operated and maintained in a manner
consistent with these recommended standards and guidance)
is expected to achieve treatment performance equal to
Treatment Level A.
Mound System: Performance Criteria - ANSWER-When effluent
is delivered to
a mound by timed dosing, then the dispersal to the native
soil will also be
considered as receiving timed
dosing.
Mound System: Performance Criteria - ANSWER-Mounds are a
poor choice on sites where either or both the vertical
separation and the horizontal separation are severely limited
(such as less than 12" VS or less than 25 feet HS).
Mound System: Permitting - ANSWER-WAC 2.1.1. Permitting
and installation of
mound systems are subject to local and state code and at a
minimum must
,comply with WAC 246-
272A.
Mound System: Permitting - ANSWER-WAC 2.1.2. All required
permits, must be obtained from the appropriate local health
officer prior to installation and use. For sites where mounds are
used to meet Treatment Level B, some means acceptable to the
local health jurisdiction must be implemented to assure proper
on-going operation and maintenance (O&M) of the system
components as long as the facility is served by the on-site
sewage system. The following, used separately or in
combination, are examples of approaches for assuring
longterm O&M:
Mound System: Permitting - ANSWER-WAC 2.1.2.1. recording
the requirement
for an on-going service contract on the
property deed
Mound System: Permitting - ANSWER-WAC 2.1.2.2. issuing
an operating
permit (in addition to the initial installation permit), with the
requirement for
maintaining a service
contract;
Mound System: Permitting - ANSWER-WAC 2.1.2.3. requiring a
management entity to provide O&M assurance. Examples of
management entities include: cities & towns, public utility
, districts, water & sewer districts, special-use districts, and
corporations with demonstrated capacity to assure long-term
management.
Mound System: Mound Location - ANSWER-Locate the mound
in open areas
for exposure to sun and wind where evaporation and
transpiration will be
maximized.
Mound System: Mound Location - ANSWER-WAC 2.2.1. Do not
construct mound systems in drainage ways, depressions, or
areas subject to flooding.
Mound System: Mound Location - ANSWER-WAC 2.2.2.
Upslope runoff must
be diverted around the
mound.
Mound System: Mound Location - ANSWER-WAC 2.2.3. Good
design practice
must consider drainage constraints for both upgradient and
downgradient area
drainage. The local health officer may require additional site
evaluations and/or
testing to analyze the site before siting the
mound system.
EXAM (Latest 2026) || Most Recent Exam 2026|2027
Actual Complete Real Exam Questions And Correct
Answers (Verified Answers) Already Graded A+ |
Guaranteed Success!! Latest Version | Brand New!!
Mound Systems: - ANSWER-Mounds are an excellent treatment
and dispersal choice on appropriate sites, but they are not very
forgiving. Special attention must be given to siting, design, pre-
construction planning, site preparation, filter media selection,
construction and maintenance of these systems. Quality
control throughout the process cannot be overemphasized.
Mound Systems: - ANSWER-Mound system design has been
developed for those site conditions in which adequate vertical
separation is not available between the bottom of a SSAS and a
restrictive layer, or a water table.
Mound system design addresses the following site and soil
conditions: - ANSWER-Permeable or slowly permeable soils
with a high water table. Excessively permeable soils over
unprotected aquifers or shallow permeable soils overlying
excessively permeable soils or creviced or porous bedrock.
Slowly permeable soils without a high water table
Mound System: Performance Criteria - ANSWER-When properly
sited, designed, installed, operated and maintained, a mound
,system consistent with these recommended standards and
guidance is expected to achieve treatment performance equal
to Treatment Level B or C.
Mound System: Performance Criteria - ANSWER-When
preceded by a treatment product listed on the List of
Registered On-site Treatment and Distribution Products as
meeting Treatment Level B, a mound system (properly sited,
designed, installed, operated and maintained in a manner
consistent with these recommended standards and guidance)
is expected to achieve treatment performance equal to
Treatment Level A.
Mound System: Performance Criteria - ANSWER-When effluent
is delivered to
a mound by timed dosing, then the dispersal to the native
soil will also be
considered as receiving timed
dosing.
Mound System: Performance Criteria - ANSWER-Mounds are a
poor choice on sites where either or both the vertical
separation and the horizontal separation are severely limited
(such as less than 12" VS or less than 25 feet HS).
Mound System: Permitting - ANSWER-WAC 2.1.1. Permitting
and installation of
mound systems are subject to local and state code and at a
minimum must
,comply with WAC 246-
272A.
Mound System: Permitting - ANSWER-WAC 2.1.2. All required
permits, must be obtained from the appropriate local health
officer prior to installation and use. For sites where mounds are
used to meet Treatment Level B, some means acceptable to the
local health jurisdiction must be implemented to assure proper
on-going operation and maintenance (O&M) of the system
components as long as the facility is served by the on-site
sewage system. The following, used separately or in
combination, are examples of approaches for assuring
longterm O&M:
Mound System: Permitting - ANSWER-WAC 2.1.2.1. recording
the requirement
for an on-going service contract on the
property deed
Mound System: Permitting - ANSWER-WAC 2.1.2.2. issuing
an operating
permit (in addition to the initial installation permit), with the
requirement for
maintaining a service
contract;
Mound System: Permitting - ANSWER-WAC 2.1.2.3. requiring a
management entity to provide O&M assurance. Examples of
management entities include: cities & towns, public utility
, districts, water & sewer districts, special-use districts, and
corporations with demonstrated capacity to assure long-term
management.
Mound System: Mound Location - ANSWER-Locate the mound
in open areas
for exposure to sun and wind where evaporation and
transpiration will be
maximized.
Mound System: Mound Location - ANSWER-WAC 2.2.1. Do not
construct mound systems in drainage ways, depressions, or
areas subject to flooding.
Mound System: Mound Location - ANSWER-WAC 2.2.2.
Upslope runoff must
be diverted around the
mound.
Mound System: Mound Location - ANSWER-WAC 2.2.3. Good
design practice
must consider drainage constraints for both upgradient and
downgradient area
drainage. The local health officer may require additional site
evaluations and/or
testing to analyze the site before siting the
mound system.
