Air pollution, noise pollution and solid waste management a) Historically what were the ingredients for major air pollution events? b) Two construction sites A and B produce different noise levels as shown in Table 2. Calculate the resulting sound level and identify the site which produces high sound level? (4+2 marks) Table 2: Sound level produce by two different construction site Construction Site A (sound levels in dB) 60 63 64 66 Construction Site B (sound levels in dB) 61 62 62 63 c) Determine the size of the trucks and the number of the trucks required to collect the residential solid waste generated from a city of population 40,000 using the following data. The average. solid waste generation rate is 1.12 kg/person.day and the average uncompacted density is 134.7 kg/m. Each residence has one pickup per week and that there will be no rear-of-house pickups. Average residential occupancy = 4/residence Maximum number of cans per stop=2 at 0.0757 m/can Truck compactor density rating =490 kg/m Truck unloading time = 8.5 min Delay time = 30 min Distance to disposal site =30 km Average hauling speed = 45 km/h Number of trips to disposal site = 1/d Time between pickup stops = 20 s Dump time (regression coefficient 'a') = 12.6 s/can Number of working days = 7 d/week Standard side loading compactor truck capacities (all in m): 9.0, 10.0, 12.0, 14.0, 15.0, 18.0 Total break time = 30 min/d