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Table 4

Costs (US$) associated with both maintenance alternatives for SSO failures

Cost/characteristicPreventive servicingEmergency clearing/remediationa
Equipment 1 (sewer jetting) cost/work dayb 441 441 
Equipment 2 (water tanker) cost/work day 103 103 
Equipment 3 (jitney) cost/work day — 75 
Equipment 4 (trench pump) cost/work day — 29 
Labour cost/work day (craftsman I)c 54 54 
Labour cost/work day (supervision)d 80% labour 80% labour 
Labour cost/work day (craftsman II)e — 57 
Labour cost/work day (craftsman III)f — 62 
Overtime rate/work dayg — 116 
Cost/characteristicPreventive servicingEmergency clearing/remediationa
Equipment 1 (sewer jetting) cost/work dayb 441 441 
Equipment 2 (water tanker) cost/work day 103 103 
Equipment 3 (jitney) cost/work day — 75 
Equipment 4 (trench pump) cost/work day — 29 
Labour cost/work day (craftsman I)c 54 54 
Labour cost/work day (supervision)d 80% labour 80% labour 
Labour cost/work day (craftsman II)e — 57 
Labour cost/work day (craftsman III)f — 62 
Overtime rate/work dayg — 116 

aEmergency intervention to unblock an SSO failure mode.

bThe work day cost refers to the fact that (as it has been reported by WASA) it may take an entire day or less to perform the maintenance activity. It is similar in all alternatives and scenarios, for ease of comparison.

cCraftsman I's rate (https://www.labour.gov.tt).

dThe supervision cost corresponds to 80% of the total labour cost (WASA; https://www.labour.gov.tt). It may involve in some instances more than one supervisory personnel, depending on the severity and consequences of the WWCS failure (WASA).

eCraftsman II's rate (https://www.labour.gov.tt).

fCraftsman III's rate (https://www.labour.gov.tt).

gAn overtime rate (https://www.labour.gov.tt) is applied to the three labour personnel involved in any emergency intervention lasting more than a day. After that, the supervisory costs are determined (the same 80% (WASA; https://www.labour.gov.tt) of the total labour costs).

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