Do you know at what level PCE concentrations are of concern? Is 8,300 PPB a major problem?

Go to the second post. I forget to add the link here but I did there.

I googled PCE and came up with all kinds of things that PCE can stand for; i.e., from professonal organizations and none of them came close to what I assume you are asking about. I assume perchloroethylene. Here are a number of articles I found. Perhaps there will be something there that will give you some indication of the toxicity and at what levels. Or perhaps PCE stands for something different.
http://www.google.com/search?hl=en&client=firefox-a&hs=Xwx&rls=org.mozilla:en-US:official&ei=aOeOS8nIDsyttgez55y7Cw&sa=X&oi=spell&resnum=0&ct=result&cd=1&ved=0CBcQBSgA&q=perchloroethylene&spell=1

OK. The link shows. Take you pick from the many sites.

To determine if a concentration of 8,300 parts per billion (PPB) of PCE (perchloroethylene) is a major problem, we need to understand the accepted levels of concern for this chemical.

Perchloroethylene is a volatile organic compound commonly used in dry cleaning, metal degreasing, and other industrial processes. Exposure to high levels of PCE can have health effects, including damage to the nervous system, liver, and kidneys.

To assess the level of concern for PCE concentrations, we can refer to regulatory guidelines and safety standards set by different organizations.

1. Occupational Safety and Health Administration (OSHA): OSHA has established a permissible exposure limit (PEL) for PCE in the workplace. The current PEL for an 8-hour workday is 100 parts per million (equivalent to 100,000 PPB). This limit is intended to protect workers from adverse health effects.

2. Environmental Protection Agency (EPA): EPA has set a maximum contaminant level (MCL) of 5 micrograms per liter (µg/L) or 5 parts per billion (PPB) for PCE in drinking water. This level is based on protecting public health from the potential long-term exposure through consumption of contaminated water.

Comparing the above guidelines, we can see that the PCE concentration of 8,300 PPB is significantly higher than both the occupational and drinking water standards. Consequently, it raises concerns about potential health risks.

It is crucial to address the source of the high PCE concentration and take appropriate measures to reduce exposure. Consulting a certified professional, such as an environmental engineer or toxicologist, would be recommended to assess the specific situation and determine the necessary actions to mitigate any potential risks.