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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord,California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> ux Associates Client Project ID Arco 2150%St66kton <br /> J1,855 Gateway Blvd , Ste 770 Matrix Sodncord, CA 94520 <br /> Attention Paul Supple OC Sample Group 310-0539 Reported Oct 18, 1993 <br /> 1 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- STLC <br /> Benzene Toluene Benzene Xylenes Lead <br />' Method. EPA 8020 EPA 8020 BPA 8020 EPA 8020 EPA 7420 <br /> Analyst J F J F J F J F K Anderson <br /> Conc. Spiked 040 040 040 12 10 <br /> Units mg/kg mg/k9 mg/kg mg/kg mg/L <br />' LCS Batch# 2LCS101493 2LCS101493 2LCS101493 2LCS101493 BLK101693 <br /> iDate Prepared 10/14/93 10/14/93 10/14/93 10/14/93 10/16/93 <br /> Date Analyzed 10/14/93 10/14/93 10/14/93 10/14/93 10/18/93 <br /> nstrument I D # HP-4 HP-4 HP-4 HP-4 SpectrAA-20 <br /> LCS % <br /> 10 Recovery 99 98 97 99 78 <br /> Control Limits: 70-130 70-130 70-130 70-130 75-125 <br />' MS/MSD <br /> Batch# 3100399 3100399 3100399 3100399 3100539 <br /> ADate Prepared 10/14/93 10/14/93 10/14/93 10/14/93 10/16/93 <br /> Date Analyzed 10/14/93 10/14/93 10/14/93 10/14/93 10/18/93 <br /> nstrument I D #. HP-4 HP-4 HP-4 HP-4 SpectrAA-20 <br />' Matrix Spike <br /> %Recovery: 90 90 90 91 83 <br />' Matrix Spike <br /> Duplicate% <br /> Recovery 90 92 90 92 86 <br />' Relative% <br /> Difference 00 22 00 1 1 36 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sampie of known,interferent free matrix that is analyzed using the same reagents, <br /> prepara ion and analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSD s are advisory only <br /> and are not used to accept or reject batch results <br /> Kenneth K F Lee <br /> Laboratory Director <br /> 3100539 ROU <3> <br />