trade waste interceptor traps 1#
What is trade waste primarily associated with?
A
Rainwater runoff
B
Domestic household wastewater
C
Industrial or commercial wastewater
D
Natural water bodies
C. Industrial or commercial wastewater
Which of the following is an example of a commercial premise that typically generates acceptable trade waste?
A
Day care centres
B
Chemical manufacturing plants
C
Automotive repair shops
D
Hazardous waste disposal facilities
A. Day care centres
What is the primary purpose of access and inspection chambers?
A
To allow for maintenance and cleaning of drains
B
To provide above ground access to drains
C
To serve as decorative features in landscaping
D
To prevent water from entering the drainage system
To allow for maintenance and cleaning of drains
According to the New Zealand Building Code, what distinguishes an access chamber from an inspection chamber?
A
Access chambers allow a person to enter, while inspection chambers do not
B
Inspection chambers are used for stormwater only, while access chambers are for foulwater
C
Access chambers are located above ground, while inspection chambers are below ground
D
Access chambers are smaller than inspection chambers
A. Access chambers allow a person to enter, while inspection chambers do not
What should be done after flushing a newly installed water system?
A
Fill the system with water immediately
B
Chlorinate the system
C
Install additional valves
D
Leave the system empty
B. Chlorinate the system
Why should harsh cleaning fluids not be disposed of through a grease converter?
A
They increase the flow rate
B
They can cause corrosion
C
They disrupt bacterial processes
D
They attract pests
C. They disrupt bacterial processes
What is the primary purpose of interceptor traps in wastewater management?
A
To enhance the aesthetic appeal of drainage systems
B
To increase the flow rate of wastewater
C
To contain, isolate, or treat trade waste before discharge
D
To monitor the temperature of wastewater
C. To contain, isolate, or treat trade waste before discharge
What is the primary standard referenced for plumbing and drainage in the installation of chambers?
A
AS/NZS 1547
B
AS/NZS 3500.2
C
NZS 4404
D
G13/AS1
B. AS/NZS 3500.2
What is the minimum depth requirement for an access chamber from cover level to drain invert?
A
Less than 1 meter
B
Greater than 1 meter
C
Exactly 1 meter
D
No specific requirement
B. Greater than 1 meter
What is the recommended free chlorine concentration for disinfecting a newly installed water system?
A
10mg/litre to 100mg/litre
B
50mg/litre to 200mg/litre
C
5mg/litre to 15mg/litre
D
1mg/litre to 10mg/litre
A. 10mg/litre to 100mg/litre
What is the minimum capacity required for a grease trap
100 litres
For a restaurant with 60 seats, what is the minimum grease trap capacity required
300 litres
How thick should the concrete base be for installing vertical rings of access chambers
150mm
What is the minimum grade for the slope on the floor towards the channel when constructing a wet access chamber according to G13/AS2
1:1.5
What pressure should be applied during the pressure test of the water supply system
1500kPa
What is the minimum diameter required for a vent pipe connected to a grease trap
50 mm
What should be done after installing a grease trap to ensure it is functioning properly
Fill it with water to check for leaks
How deep should access chambers be at a minimum?
1000mm
What is the minimum clear opening size for access chamber lids used in infrastructure works?
600mm
According to G12/AS1 what shall the minimum depth of a water supply pipe be laid under a residential driveway
600 mm
What are the three classifications for trade waste
prohibited, conditionally acceptable, acceptable
How much water is required to shift the pH of 1 litre of trade waste from pH 4 to pH 5
10 litres
What is the recommended additional fall for a drainage system when changing direction by 30 degrees?
12mm
How deep should a channel be formed for a 150mm pipe?
150mm
According to the fire service code, what is the maximum distance fire hydrants should be from buildings in domestic areas
135m