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Dames & Moore, 1999 - USDA Forest Service

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June 8, 1998<br />

Seep and Portal, May 1998, Holden Mine<br />

Page 4<br />

16. Overall Assessment of Data<br />

The usefulness of the data is based on EPA guidance documents listed above. . Upon<br />

consideration of the information presented above, the data are acceptable except where flagged with<br />

data qualifiers that modify the usefulness of the individual values.<br />

Conventional Analvses<br />

Samples were analyzed for total dissolved solids (TDS), total suspended solids (TSS), alkalinity,<br />

and sulfate by EPA or other methods identified in the introduction of this report. In addition, hardness<br />

was determined by calculation from dissolved metals analysis and reviewed for correctness.<br />

1. Hold Time - Acceptable<br />

-<br />

. .<br />

* <<br />

2.<br />

3.<br />

Initial Calibration - Acceptable<br />

Applicable for alkalinity and sulfate.<br />

Continuing Calibration - Acceptable<br />

Applicable for alkalinity and sulfate.<br />

4. Blanks - Acceptable<br />

5. Laboratory Control Sample - Acceptable<br />

I<br />

Applicable for alkalinity. A standard reference material (SRM) was used to evaluate sulfate.<br />

Results were acceptable.<br />

6; Laboratory Sample Duplicate - Acceptable<br />

7. Field Duplicate - Acceptable<br />

Sample SP-2X is the field duplicate of sample SP-2.<br />

8. Matrix Spike (MS) - Acceptable<br />

Applicable for sulfate.<br />

9. . Detection Limits - Acceptable<br />

The detection limit reported for sample HC-4 was 2.2 mg/L which is above the QAPP<br />

requirement of 1.0 mgA. The increased detection limit was due to the use of reduced sample volume as<br />

this sample was used for the laboratory duplicate analysis.<br />

10. Type of Review - Summary

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