Dames & Moore, 1999 - USDA Forest Service

December 8, 1998
Lagoon Soil Samples, Fall 1998, Holdcn Mine
Page 2
1. Holding Time - Acceptable
2. Initial Calibration - Acceptable
3. Continuing Calibration - Acceptable
4. Blanks
Copper (3.2 to 4.0 uglL) was detected in calibration blanks (CCBs) associated with several of the
sample analyses. As the copper concentration in the samples was substantially greater (100X) than the
equivalent soil concentration detected in the CCB, data were not qualified.
5. ICP Interference Check (ICP analysis only) - Acceptable
6. Laboratory Control Sample - Acceptable
7. Laboratory Duplicate Sample - Acceptable
8. Field Duplicate
A field duplicate was not collected.
9. Matrix Spike
The matrix spike was performed on sample DMLG-4-2. The recoveries for cadmium (-21.4%),
copper (-1550%), and lead (14.3%) were outside of the control limits (75-12596). The concentration of
cadmium (150 mglkg), copper (17,500 mglkg), and lead (730 mglkg) in the sample exceeded the spiking
concentration by greater than 4X. Data qualification was not required.
10. ICP Serial Dilution (ICP analysis only) - Acceptable
11. Detection Limits - Acceptable
12. Type of Review - Summary
13. Overall Assessment of Data
The usefulness of the data is based on EPA guidance documents listed above. Upon
consideration of the information presented above, the data are acceptable except where flagged with
data qualifiers that modify the usefulness of the individual values.
Orcaanic Analvses
Select samples (as noted in the report introduction) were analyzed for TPH (diesel extended
range) by the Washington State methods previously referenced.
1.
Hold Time
Samples DMLG-1-4, DMLG-2-7 %. DMLG-3-2, DMLG-3-4, and DMLG-5-4 were reextracted due
to low surrogate recoveries. The surrogate recoveries were acceptable in the reextracts; however, the
reextraction occurred ,6 days past the 14 day hold time for extraction. The reextract data was acceptable
for site evaluation with qualification. The data are estimated and flagged "J" accordingly.