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Dames & Moore, 1999 - USDA Forest Service

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June 15,1998<br />

Low Level Lead, May 1998, Holden Mine<br />

Page 2<br />

VP- 1<br />

SP-23<br />

Analvses Reauested<br />

DissolvedlTotal Metals<br />

Dissolved Metals<br />

The following comments refer to Frontier Geosclences' perfomance in meeting quality control<br />

specifications described in the EPA documents 'Draft Method '1638'~ and 'USEPA Contract Laboratory<br />

Program (CLP) National Functional Guidelines for Inorganic Data RevieM, February 1994, and the<br />

Quality Assurance Projed Plan (QAPP) prepared .for the Phase Ill Remedial Investigation dated April<br />

17, 1997.<br />

Sample aliquots for dissolved metals were filtered in the field. Samples were collected in<br />

predeaned containers provided by Frontier. The samples were presewed immediately upon receipt by<br />

the laboratory.<br />

Samples were prepared in the laboratory using EPA Method 1638 modified as documented .by<br />

Frontier Geosciences.<br />

1. Holding Time - Acceptable<br />

2. Tunes - Acceptable<br />

3. Initial Calibration - Acceptable<br />

4. Continuing Calibration - Acceptable<br />

5. Blanks - Acceptable<br />

Blank subtradion is outlined in the method.' The reagent blank was properly analyzed and<br />

results were averaged per the method for the purpose of blank subtraction related to sample calculation.<br />

6. Internal Standards - Acceptable<br />

7. Laboratory Control Sample - ~cceptable<br />

8. Laboratory Duplicate Sample - Acceptable<br />

9. Field Duplicate - Acceptable<br />

A field duplicate for RC-4 was submitted and labeled RC-4X.<br />

10. Matrix SpikeIMatrix Spike Duplicate (MSIMSD) - Acceptable<br />

A MSIMSD was performed on the total fraction'of sample RC-4 and RC-10.<br />

11. Detection Limits - Acceptable<br />

12. Type of Review - Standard

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