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Q9. a) Describe a vacuum sewage system. (8)

b) With reference to the system described in (a)

i) State advantages of the system. (2)

ii) State why a holding tank may be required to be fitted to the system. (2)

iii) State the problems resulting from the retention of untreated sewage in a holding tank. (2)

iv) State the periodic maintenance required on the system. (2)