The fate of three groups of microorganisms â bacteria, protozoa, and viruses â in wastewater is an important consideration in onsite sewage treatment and disposal systems (hereafter referred to as septic systems).he fate of three groups of microorganisms â bacteria, protozoa, and viruses â in wastewater is an important consideration in onsite sewage treatment and disposal systems (hereafter referred to as septic systems).
Forget maps......Chicago is in zone 5...and gardeners wishing to plant those plants that are hardy to the Chicago area had better realize that zone 5 plants are the ones to buy. Besides zones are a relative term. Chicago is on the shores of Lake Michigan and the closer to the Lake, the more moderate the temperatures.
Temperatures don't normally reach 100 Â°F in Chicago. But it does get into the 90s on an average 14 days a year. The days are above 50 degrees from June to September and nearly every day in May and October. But Chicago only gets that warm for a few days in winter.