Dames & Moore, 1999 - USDA Forest Service

June 15,1998
Low Level Lead, May 1998, Holden Mine
Page 2
VP- 1
SP-23
Analvses Reauested
DissolvedlTotal Metals
Dissolved Metals
The following comments refer to Frontier Geosclences' perfomance in meeting quality control
specifications described in the EPA documents 'Draft Method '1638'~ and 'USEPA Contract Laboratory
Program (CLP) National Functional Guidelines for Inorganic Data RevieM, February 1994, and the
Quality Assurance Projed Plan (QAPP) prepared .for the Phase Ill Remedial Investigation dated April
17, 1997.
Sample aliquots for dissolved metals were filtered in the field. Samples were collected in
predeaned containers provided by Frontier. The samples were presewed immediately upon receipt by
the laboratory.
Samples were prepared in the laboratory using EPA Method 1638 modified as documented .by
Frontier Geosciences.
1. Holding Time - Acceptable
2. Tunes - Acceptable
3. Initial Calibration - Acceptable
4. Continuing Calibration - Acceptable
5. Blanks - Acceptable
Blank subtradion is outlined in the method.' The reagent blank was properly analyzed and
results were averaged per the method for the purpose of blank subtraction related to sample calculation.
6. Internal Standards - Acceptable
7. Laboratory Control Sample - ~cceptable
8. Laboratory Duplicate Sample - Acceptable
9. Field Duplicate - Acceptable
A field duplicate for RC-4 was submitted and labeled RC-4X.
10. Matrix SpikeIMatrix Spike Duplicate (MSIMSD) - Acceptable
A MSIMSD was performed on the total fraction'of sample RC-4 and RC-10.
11. Detection Limits - Acceptable
12. Type of Review - Standard