See if their equipment looks well-maintained or old and beat up. Their equipment is a representation of their company and how they clean. Make sure their filtration unit is big enough for a cleaning of a parking structure as well. Most garages of 300,000 square feet will have more than 50 to 300 gallons of sludge. If their filtration unit has a capacity of 60 gallons, then most likely it is undersized for the job.
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The ecological footprint is a measure of human demand on the Earth's ecosystems, the amount of natural capital used each year.n 2007, the Global Footprint Network estimated the global ecological footprint as 1.5 planet Earths; that is, they judged that ecological services were being used 1.5 times as quickly as they were being renewed. Ecological footprint for different nations compared to their Human Development Index.