Exam (elaborations)
Exam 3 - Commercial Contractor Exam (1).
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- NC Commercial Contractor
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- NC Commercial Contractor
Exam 3 - Commercial Contractor Exam (1).
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Exam 3 - Commercial Contractor Examconcrete
fiberglass
plastic - ANS-Septic Tank Materials
treatment capacity shall be sized for daily (24hr) peak flow volume of facility - ANS-Septic Tank
Sizing
the volume of the first compartment of the first treatment tank shall be at least 2/3rds the volume
of the total 24hr flow - ANS-septic tanks that are trained together under the parameter that__
1000 gallons - ANS-minimum septic tank size
increase by 50% - ANS-if garbage grinders/garbage disposals are used?
All tanks shall be equipped with 4" PVC, ASTM 3034 rated or equivalent T's at the inlet and
outlet end of the tank - ANS-"T's" and filters
so that they extend into the liquid a depth of minimum of 25% and maximum of 50% - ANS-T's
shall be constructed__
shall be equipped with an effluent filter designed to handle both the daily flow volume and
wastewater characteristics - ANS-outlet T's
shall be located 2" below the invert of the inlet T - ANS-Invert of outlet T
length is at least 1.5 times the width and have 2 compartments - ANS-Tank dimensions
will be located at a point not less than 2/3rds or more than 3/4ths the length of the tank from the
inlet end - ANS-Tank compartment partitions
a pass-thru hole or slot equal to or greater than the diameter of the inlet pipe is positioned below
the liquid surface 25-50% of total liquid depth - ANS-compartment partitions will be constructed
so__
Walls and bottom of poured-in-place septic tanks must be reinforced by using a 6x6" No.10
gage welded steel reinforcing wire or fibrous reinforcing material conforming to ASTM
specifications for such materials - ANS-construction standards for reinforcement
, must be reinforced using 3/8" steel reinforcing rods (rebar) which shall be spaced 12" on center
each way extending a minimum of 2.5" and a max of 3" from the outside edge of the tank -
ANS-tank lids
a uniform live load of 150lbs per square foot in addition to all loads which an underground tank
is normally subjected - ANS-tank must be able to withhold
shall be required when the loads on a concrete tank are exceeded by subjecting it to vehicular
traffic or when the top of the tank is placed deeper than 3ft below the finished grade -
ANS-additional reinforcement
4" - ANS-walls, bottoms, and lids poured-in-place septic tanks shall have a minimum thickness
of
one or two pieces and shall have securable, removable access openings located so the inlet
and outlet T's can be readily accessed - ANS-tank lids shall be constructed in, and shall have
shall be a minimum of 15" free space and maximum of 24"
Tanks with more than 12" of cover must extend access openings to within 12" of the ground
surface - ANS-Access openings
concrete used for poured-in-place or pre-cast septic tanks shall have a minimum 28-day
compressive strength of 4000 pounds per square inch - ANS-concrete specifications
may be helpful in eliminating "honeycombing" or "bridging" in the finished product -
ANS-Vibrating the forms or mix
onsite sewage management systems requiring 500 linear feet of field line or more must be
equipped with a dosing device - ANS-Dosing required
can be accomplished using pumps or siphons - ANS-dosing
required to have a single pump or siphon and a single absorption field - ANS-systems requiring
500' but less than 1000' linear feet of field line
must have alternating pumps or siphons along with alternating absorption fields - ANS-systems
requiring 1000' linear feet
one or two piece dosing tanks may be used
if two-piece: must be joined using mastic, butyl rubber, or other pliable sealant that is water
proof, corrosion resistant and approved for septic tank - ANS-dosing tank construction
requirements
length, width, or shape - ANS-What is not required for dosing tanks
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