SEPTIC INSTALLER TEST FOR WASHINGTON STATE (WOSSA) PRACTICE EXAM 200 QUESTIONS WITH VERIFIED AND DETAILED SOLUTIONS 100% CORRECT BRAND NEW!!

SEPTIC INSTALLER TEST FOR
WASHINGTON STATE (WOSSA)
PRACTICE EXAM 200 QUESTIONS
WITH VERIFIED AND DETAILED
SOLUTIONS 100% CORRECT BRAND
NEW!!
"Horizontal separation between the soil dispersal component and the ordinary high-water mark is
_______ feet or greater; and
(d) Vertical separation is _____ feet or greater. - CORRECT ANSWER=> 50', 2'"

"there must be a _____ foot radius around a subdivision OSS with a well to create a water protection
zone - CORRECT ANSWER=> 100'"

"the health officers shall require a minimum land area of _________ sq ft in a subdivision lot - CORRECT
ANSWER=> 12,000 sqft"

"a device placed in a sewage tank for multiple functions, including dissipating energy, directing solids,
retaining solids, and drawing liquid off at a specific depth.not an intercompartmental wall. - CORRECT
ANSWER=> baffle"

"sewage tanks must be designed to withstand a dead load equivalent to at least ______________ of
earth cover with a unit density of at least 110 lb/ft3 and a wheel load concentration over the critical
elements of the tank - CORRECT ANSWER=> 3 feet , 2500lbf"

"tanks installed with more than 3 feet of cover must be.... - CORRECT ANSWER=> reinforced to
withstand the added load"

"Sewage tanks must be designed and constructed of ______ and ______ materials that do not corrode
or decay - CORRECT ANSWER=> solid, durable and watertight"

"All inlet and outlet devices must have sanitary tees constructed of - CORRECT ANSWER=> PVC or ABS"



Page | 1

, "all sanitary tees must have an inside diameter of - CORRECT ANSWER=> 4""

"Sewage tanks must maintain at least a ________ air space between the underside of the top of the tank
and the top of any of the inlet, outlet, or intercompartmental fitting to vent gases - CORRECT
ANSWER=> 1""

"The minimum diameter of the sewage tank opening must be:
(i) ___________ inches for tanks with a liquid volume of less than or equal to two thousand gallons; and
(ii) ___________ for tanks with a liquid volume greater than two thousand gallons. - CORRECT
ANSWER=> 18", 20""

"Maximum distance between access points on a tank must be _______ feet center-to-center - CORRECT
ANSWER=> 10'"

"Risers must be a minimum of ________ inches in diameter - CORRECT ANSWER=> 23""

"Septic tanks must be designed and constructed with a minimum of _______ compartments. This
standard may be met by one tank with two compartments or by two single compartment tanks in -
CORRECT ANSWER=> 2"

"The inlet sanitary tee or baffle extends at least _______ inches downward below the liquid level -
CORRECT ANSWER=> 8""

"The invert of the inlet pipe is a minimum of _____ inches above
the invert of the tank outlet - CORRECT ANSWER=> 2""

"The outlet sanitary tee or baffle extends below the liquid
level at least ___________ - CORRECT ANSWER=> 30%"

"Slots or ports may be used as - CORRECT ANSWER=> inter compartmental fittings"

"The location of the slot or port must be at the _________ as the bottom of outlet tees or baffles -
CORRECT ANSWER=> same depth"

"an inter compartmental wall opening must have a minimum area of ___________ with a minimum
vertical dimension of ________ inches - CORRECT ANSWER=> 12 square inches , 3""

"The length of a septic tank with a liquid capacity less than three thousand gallons must be a minimum
of ______ times the width.
(b) The length of septic tanks with a liquid capacity greater than or equal to three thousand gallons must
be a minimum of ______ times the width. - CORRECT ANSWER=> 1.25 , 1.5"

"Septic tanks must contain a liquid depth of not less than_______ feet. - CORRECT ANSWER=> 3'"

Page | 2