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i Sequoia 404 N WiLane Walnut Creek CAA 94598 WO Analytical FAX (925)988-9600 (925) 985-9673 4Requoia Analytical Client Project ID M907413 -ATC Associates Inc 885 Jarvis Dr Matrix Liquid Morgan Hill, CA 95037 Attention Kayvan Kimyai QC Sample Group 9071349-352 Reported Jul 26, 1999 QUALITY CONTROL DATA REPORT Analyte Benzene Toluene Ethyl Xylenes Benzene QC Batch# GC072199 GC072199 GC072199 GCO72199 802005A 802005A 802005A 802005A Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 Analyst J Minkel J Minkel J Minkel J Minkel MS/MSD # 9071349 9071349 9071349 9071349 Sample Cone ND N D ND N D Prepared Date 7/21/99 7/21/99 7/21/99 7/21/99 Analyzed Date 7/21/99 7/21/99 7/21/99 7/21/99 Instrument I D # HP-5 HP 5 HP-5 HP-5 Cone Spiked 20 ug/L 20ug/L 20 ug/L 60 ug/L Result 20 20 21 63 MS % Recovery 100 100 105 105 Dup Result 23 23 24 72 SD %Recov 115 115 120 120 RPD 14 14 13 13 RPD Limit 0-20 0-20 0-20 0-20 LCS # 5LCS072199 5LCS072199 5LCS072199 5LCS072199 Prepared Date 7/21/99 7/21/99 7/21/99 7/21/99 Analyzed Date 7/21/99 7/21/99 7/21/99 7/21/99 Instrument I D # HP 5 HP-5 HP 5 HP 5 Cone Spiked 20ug/L 20ug/L 20ug/L 60Ng/L LCS Result 20 20 20 E3 LCS % Recov 100 100 100 105 LCS 70-130 70130 70130 70-130 Control Limits Please Note The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, SEQUOIA AL, #1271 preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample fortified with known quantities of specific compounds and subjected to the entire analytical procedure If the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix interference the LCS recovery is to be used to validate the batch Charlie WestWater **NIS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference Project Manager 9071349 SSS <2>