Determine the annual cost per megagram and the average weekly charge per household for a system using a crew of two and for a system using a crew of one for the city of Nosleep (population 361, 564).

Nosleep collection data: Number of pickups = 1 /wk (no rear-of-house service)

Average number of cans per stop = 2.53/wk at 0.1136 m ³ /can

Average number of residents per stop = 4

Mean time per collection stop plus mean time to reach next stop:

For crew of one = 0.01180 h

For crew of two = 0.00883 h

Average uncompacted density = 100.76 kg/m ³

Average observed compaction ratio = 3.97

Average transport time to disposal site including delays and dumping = 1.00 h/trip

Average number of trips to disposal site = 1/d

Rest breaks = 2 at 15.0 min

Average maintenance downtime = 24.0 min/d

Average workday = 8.00 h

Average percent of trucks out of service for major repairs = 15.0%

Labor costs for Nosleep

apaid by overhead.

Blncluded in O & M cost.

cDependent on number and type of trucks required.

Average workweek = 40 h/wk. 5 d/wk

Overhead rate = 75.04% of total crew wages

Truck data:

Capital cost of 15.0-m ³ truck = $122.000

O & M for 15.0-m ³ truck = $5.75/km

Capital cost of 21.0-m ³ truck = $141,000

O & M cost for 21.0-m ³ truck = $6.55/km

Truck compactor density rating = 400 kg/m ³

Anticipated life = 5 y Interest rate = 6.75%

Average annual distance for each truck = 11.797 km

Employee title Director Secretarya Bookkeeper" Route supervisors Senior mechanic Mechanic Crew of two: Driver (1/truck) Collector (1/truck) Crew of one: Driver/collector General laborersa Number 1 1 1 4 1 3 C C C 4 Wage rate, $/h 48.95 13.44 23.02 33.50 37.68 25.11 15.25 14.70 16.00 7.40