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.
Reducing humanity's impact WWF is working to reduce humanity's ecological footprint â the amount of land and natural resources needed to supply our food, water, fibre and timber, and to absorb our CO 2 emissions. Subscribe to WWF
Food, electricity, and other basic amenities for survival must be produced within the confines of nature, using raw natural resources. Based on this relationship between humanity and the biosphere, an ecological footprint is a measurement of the land area required to sustain a population of any size.