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31, 2017 was 6 ppb with 94 percent of the samples at or below the15 ppb federal action level for lead.
Three sinks in Classroom 43, also a home economics room, reached 42 ppb, 47 ppb and 25 ppb.
MOVE FORWARD, MOVE BACK In 1977, the standard was revised upward to 125 ppb because the single study upon which the original 85 ppb standard was based was discredited by the EPA.
5 times that in fish from lakes containing at least 18 ppb copper.
If the state adopts 6 ppb as a standard, it could go into effect next year.
In other words, an action level of 15 parts per billion doesn't mean that water with 14 ppb or 13 ppb of lead is safe.
5 PPB per day and [+ or -]50 PPB per year respectively, offer increased performance and better aging characteristics.
The new standard arbitrarily reduced the permissible level of arsenic to 10 ppb.
If passed, the acceptable level of atrazine could rise from three parts per billion (ppb) to as high as 12 ppb.
This Stratum 3E Clock meets or exceeds all Bellcore GR-1244-CORE requirements, meaning it is able to deliver less than 10 ppb total frequency change in holdover mode for a period of 24 hours.
With arsenic now classified as a Class 1 human carcinogen, the EPA has proposed reducing the MCL from 50 ppb to 5 ppb.