Metals results

Existing | Metals | Non-metals

January 2022
Met 18Jan22.jpg
September 2021
Met 21Sep20.jpg
July 2021
May 2021
January 2021
September 2020
Met 21Sep20.jpg
July 2020
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.

Existing | Metals | Non-metals