Timeframe. The United States Postal Services reports that as of January 2011, it takes an average of one to three days for First-Class Mail to arrive at its destination. Priority Mail takes an average of one to two days to arrive, according to the USPS.USPS only includes the time a package stays in transit in their estimations.Packages dropped off at a post office during business hours usually leave that day. Packages dropped off after hours may take an additional day.he United States Postal Services reports that as of January 2011, it takes an average of one to three days for First-Class Mail to arrive at its destination.
Short-term: Excessive levels of nitrate in drinking water have caused serious illness and sometimes death. The serious illness in infants (aka Blue Baby Syndrome) is due to the conversion of nitrate to nitrite by the body, which can interfere with the oxygen-carrying capacity of the childs blood.
Nitrite (NO2) can be formed from nitrate by a chemical process called reduction. Nitrate does not normally cause health problems unless it is reduced to nitrite. Nitrate in drinking water is measured either in terms of the amount of nitrogen present or in terms of both nitrogen and oxygen.The federal standard for nitrate in drinking water is 10 milligrams per liter (10 mg/l) nitrate-N, or 45 mg/l nitrate-NO3. when the oxygen is measured as well as the nitrogen.nless otherwise specified, nitrate levels usually refer only to the amount of nitrogen present, and the usual standard, therefore, is 10 mg/l. Short-term exposure to drinking water with a nitrate level at or just above the health standard of 10 mg/l nitrate-N is a potential health problem primarily for infants.