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SEQUOIA ANALYTICAL 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 Iwo (916) 921-9600 • FAX (916) 9210100 l IWESNA Industries Client Project ID Arco 760-93-2A, Lodi, CA n 3164 Gold Camp Dr, Suite 200 Matnx Sol[ Rancho Cordova. CA 95670 Attention David Stavarek CC Sample Group 4011259-1273 Reported Feb 10, 1994 QUALITY CONTROL DATA REPORT ANALYTE Ethyl- Oil and Benzene Toluene Benzene Xylenes Diesel Grease EPA Method: EPA 8020 EPA 8020 EPA 6020 EPA 8020 8015 Mod SM 5520 D&F Analyst C Chapman C Chapman C Chapman C Chapman Chiaravailoti N Valdes Concentration Spiked. 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg 7 5 mg/kg 250 mg/kg LCS Batch#• LCS020794 LCS020794 LCS020794 LCS020794 LCS020794 BLK020994 Date Prepared: 2/7/94 2/7/94 2/7/94 2/7/94 2/7/94 2/9/94 Date Analyzed: 2/7/94 2/7/94 2/7/94 2/7/94 2/7/94 2/10/94 Instrument LD #, HP-1 HP-1 HP-1 HP-1 HP3B N/A > . LCS % Recovery: 95 95 95 93 91 90 Control Limits, 80-120 80-120 80.120 80-120 70-130 75-125 MS/MSD Batch# 4011265 4011265 4011265 4011265 4011259 4011259 Date Prepared 2/7/94 2/7/94 2/7/94 2/7/94 2/7/94 2/9/94 Date Analyzed 2/7/94 2/7/94 2/7/94 2/7/94 2/7/94 2/10/94 1 Instrument I D.# HP-1 HP-1 HP-1 HP-1 HP3B N/A Matrix Spike % Recovery. 90 90 95 95 107 108 Matrix Spike Duplicate% 1 Recovery: 95 90 95 95 123 88 Relative % Difference: 54 0 0 00 00 14 20 1 SEQUOIA ANALYTICAL Please mote _ The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents preparation and analytical methods employed for the samples The LCS%recovery data is used for validation of sample batch results Due to matrix effects,the QC limits for MS/MSD s are advisory only / Linda C Schneider 1 and are not used to accept or reject batch results Project Manager 4011259 SES <9>