Metals, July 2021

Metals results | Non-metals results

Metals, May 2021
Metals, January 2021
Metals, September 2020
Met 21Sep20.jpg
Metals, July 2020
Metals, laboratory detection limits
  1. Go to Gallery for views of stream conditions when sampling was conducted, along with some streambed conditions.

  2. Of the 7 metals parameters for Outstanding Waters qualification, no metals standards were exceeded.

  3. The closest approach was copper at Coal in January, 6.7 ug/l as compared with the 14 ug/l standard.

  4. Zinc at 5.7 ug/l was measured at Coal in the January sampling; the hardness-adjusted standard is 189 ug/l.

  5. Zinc at 2.1 and 2.2 ug/l ostensibly were found at Bear, Coal, and West Fork, Burro Bridge in January.

  6. But 2.2 ug/l also was measured in the blank, indicating possibly no zinc was detected at those 3 streams.

  7. That is, zinc could be in the stream samples at 2.1-2.2 ug/l as a artifact of the equipment or the analysis process.

  8. It is notable that the duplicate sampling and analysis at Bear gave identical results or very nearly so.

  9. Manganese, 1-6 ug/l, was in all the streams except East Fork, but below the standards, 1600-2100 ug/l.

  10. No cadmium, lead, silver, or selenium were found at any of the streams in the summer, fall, and winter sampling.

  11. Selenium was an exception at East Fork and Slate, 1.2 and 2.1 ug/l in the winter sampling; standard, 4.6 ug/l.

Metals results | Non-metals results