Dames & Moore, 1999 - USDA Forest Service
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Dames & Moore, 1999 - USDA Forest Service

Dames & Moore, 1999 - USDA Forest Service Dames & Moore, 1999 - USDA Forest Service

fs.usda.gov
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Dcccmbcr 8, 1998 Lagoon Soil Samplcs, Fall 1998, Holden Mint Page 3 2. Initial Calibration - Acceptable 3. Continuing Calibration - Acceptable 4. Blanks - Acceptable 5. Surrogate Recoveries 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 for the initial extraction and the reextraction are tabulated below: % Recovew Initial 24.3 % Recovew Reextract 66 Due to the low recoveries from the initial extraction, the results for data evaluation were selected from the reextraction although past the method hold time (see discussion under Hold Time). 6. Laboratory Duplicate - Acceptable 7. Matrix SpikeIMatrix Spike Duplicate (MSIMSD) A MSIMSD was performed on sample DMLG-3-2. Due to low surrogate recoveries for the original, MS, and MSD samples, the QC set was reextracted. Surrogate recoveries were acceptable in the reextracted QC set. However, the recovery of diesel spiked in the first MSIMSD was outside of the laboratory control limits (38 - 160%) as the spike concentration was not recovered. The spike recoveries from the reextracted MS and MSD were 73% and -41%, respectively. The sample concentration was about 4X the spike level. Data are not generally qualified based on MSIMSD results alone. The MSIMSD sample results'indicate a potential for variability related to sample DMLG-3-2. The data for this sample was previously qualified as estimated based on surrogate recoveries. Additional qualification based on MSIMSD results does not alter the estimated qualification already assigned. 8. ~aboratory Control SampleIBlank Spike (LCSIBS) - Acceptable 9. Field Duplicate A field duplicate was not collected. 10. Target Compound Identification The sample results reporied as diesel and motor oil in samples DMLG-1-4, DMLG-2-4, DMLG-2- 7%, DMLG-3-2, DMLG-3-4, DMLG-4-2, DMLG-4-4, DMLG-5-2, and DMLG-5-4 do not match typical diesel or motor oil profiles, although the patterns are indicative of a heavy hydrocarbon component. The diesel and motor oil reported in sample DMLG-1-2 are not indicative of typical diesel or motor oil patterns. 11. Detection Limits - Acceptable 12. Type of Review - Summary g:~olden\l998/dalavallvalY964.doc DAMES & MOORE

December 8, 1998 Lagoon Soil samples, Fall 1998, Holden ,Mine Page 4 13. Overall Assessment of Data The usefulness of the data is based on the EPA guidance documents listed above. Upon consideration of the information presented above, data are considered acceptable except where flagged with data qualifiers that modify the usefulness of the individual values. Data Qualifiers U The analyte was analyzed for, but was not detected above the reported sample quantitation limit. J The. analyfe was positively identified; the associated numerical value is the approximate concentration of the analyte in the sample. UJ The analyte was not detected above the reported sample quantitation limit. However, the reported quantitation limit is approximate and may or may not represent the actual limit of quantitation necessary to accurately and precisely measure the analyte in.the sample. R The sample results are rejected due to serious deficiencies in the ability to analyze the sample and meet quality control criteria. The presence or absence of the analyte cannot be verified. < DAMES 61 MOORE

December 8, 1998<br />

Lagoon Soil samples, Fall 1998, Holden ,Mine<br />

Page 4<br />

13. Overall Assessment of Data<br />

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

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

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

Data Qualifiers<br />

U The analyte was analyzed for, but was not detected above the reported sample quantitation limit.<br />

J The. analyfe was positively identified; the associated numerical value is the approximate<br />

concentration of the analyte in the sample.<br />

UJ The analyte was not detected above the reported sample quantitation limit. However, the<br />

reported quantitation limit is approximate and may or may not represent the actual limit of<br />

quantitation necessary to accurately and precisely measure the analyte in.the sample.<br />

R The sample results are rejected due to serious deficiencies in the ability to analyze the sample<br />

and meet quality control criteria. The presence or absence of the analyte cannot be verified.<br />

<<br />

DAMES 61 MOORE

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