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DATA VALIDATION SUMMARY 2870 Gateway Oaks Dnve Suite 300 Ims Sacramento CA 95833 Telephone-(916)679-2000 Fax-(916)679-2900 ' TO Jack Kemp FROM Sacramento Project Chemistry Group FILE: 41-15884019 00 07005 DATE- January 7, 2002 SITE. American Forest Products SUBJECT American Forest Products - 4a`Quarter 2001 Acculabs Project 23297 A check for data completeness (Completeness Check) was performed by the Sacramento Project Chemistry Group on Acculabs Project 23297 for the American Forest Products Project The report contains analytical data for eight aqueous samples DMW-1, DMW-2, DMW-3, DMW-4, DMW-5, DMW-6, DMW-7, and DMW-50 Samples DMW-5/DMW-50 represent a blind field duplicate pair The samples were collected on December 12, 2001 and submitted to Acculabs in Davis, California for analysis of volatile organic compounds (EPA 8260B) and TPH-D (EPA 8015M) The laboratory report was received by the Sacramento Project Chemistry Group on January 2, 2002 The data were reviewed in accordance with analytical methods outlined in EPA SW-846 and Analysis of Water and Wastewater The data were evaluated based on the following parameters ✓ Data Completeness ✓ HoIding Times �) ✓ Blanks ✓ Surrogates ✓ Matrix Spike/Matrix Spike Duplicate ✓ Laboratory Control Samples ✓ Field Duplicates ✓ Compound Identification and Quantification The following presents an overview of the Completeness Check • The analyses were performed as requested on the chain-of custody record • The analyses were performed within the method-specified holding times • The preparation blanks were free of contamination � • High surrogate recoveries were obtained for the volatile organic analyses of samples DMW-4, DMW-5, DMW-6, DMW-7, and DMW-50 The associated positive results should be considered biased high All other surrogate recoveries were acceptable • Sample DMW-2 was utilized for the MS/MSD analyses for volatile organic compounds No MS/MSD analyses were performed for the TPH-D analysis Acceptable recoveries and relative percent differences were obtained for all other compounds • The blind field duplicate pair, DMW-51DMW-50, had high relative percent differences for 1,2- dichloroethane and carbon tetrachloride The data for these compounds should be considered estimated All other relative percent differences were acceptable • No dilutions were needed or performed These data are acceptable and useable for their intended purpose i A 15acva108 86b