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r DATA VALIDATION MEMO <br /> G� DAMES & MOORE Sacramento, <br /> Folsom Boulevard,#200 <br /> Sacramento,CA 95$26 <br /> A DAMES&MOORE GROUP COMPANY Telephone-(916)387-8800 <br /> Fax-(916)387-0802 <br /> TO: Jack Kemp INFO• <br /> FROM Sacramento QA/QC Group FILE: 15884-019-044 <br />' DATE: April 20, 2000 SITE: American Forest Products <br /> SUBJECT- Summary of Data Validation for Quanterra Project GOB280174 <br />' A check for data completeness (Completeness Check) was performed by the Sacramento QA/QC <br /> Group on Quanterra Project GOB280174 for the American Forest Products Project The report <br />' contains analytical data for eight aqueous samples DMW-1, DMW-2, DMW-3, DMNN-4, <br /> DMW-5, DMW-6, DMW-7, and DMW-70 Samples DMW-7 and DMW-70 represent a field <br /> duplicate pair The samples were collected on February 28, 2000 and submitted to the laboratory <br />' for analysis of Total Petroleum Hydrocarbons-Diesel with Northwest Cleanup (EPA 8015M) <br /> The laboratory report was received by the Sacramento QA/QC group on March 31, 2000 <br />' The data were reviewed in accordance with analytical methods outlined in EPA SW-846 The <br /> data were evaluated based on the following parameters <br /> M Data Completeness <br /> ✓ Holding Times <br /> ✓ Blanks <br /> ✓ Surrogates <br /> ✓ Laboratory Control Samples <br /> ✓ Matrix Spike/Matnx Spike Duplicates <br />' ✓ Field Duplicates <br /> ✓ Compound Identification and Quantification <br />' The following presents an overview of the Completeness Check <br /> • All analyses were performed as per the chain-of-custody records <br /> • Although no contaminants were detected in the TPH-Diesel range in the associated <br /> method blank, a hydrocarbon pattern outside the TPH-Diesel range was observed to be <br />' present in the samples and method blank Since these patterns were not quantitated as <br /> TPH-Diesel and are apparently laboratory artifacts, qualification of the data was not <br /> warranted <br />' • Since a matrix spike/matrix spike duplicate analysis was not performed, an assessment of <br /> matrix effects cannot be made All LCS recoveries met QC criteria <br /> • The field duplicate pair DMW-7/DMW-70 demonstrated acceptable field and analytical <br /> precision <br /> A 1Sacval08 732 <br />