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r SEQUOIA AN <br /> � ALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord,California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> oux Associates Client Project ICS ARCO #2130/Stockton n <br /> 1855 Gateway Blvd , Ste 770 Matrr< Soil <br /> Concord, CA 94520 <br /> Attention Paul Supple OC Sample Group 310-0640 Reported Oct 19, 1993 <br /> r <br /> QUALITY CONTROL DATA REPORT <br /> 1 <br /> ANALYTE Ethyl- STLC <br /> Benzene Toluene Benzene Xylenes Lead <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 7420 <br /> Analyst JF JF JF JF KVS <br /> Colic Spiked 040 040 040 12 10 <br /> Units mg/Kg mg/Kg mg/Kg mg/Kg mg/L <br /> rLCS Batch# lLCS101893 lLCS101893 1LCS101893 ILCS101893 BLK101693 <br /> ' Date Prepared: 10/18/93 10/18/93 10/18/93 10/18/93 10/16/93 <br /> Date Analyzed 10/18/93 10/18/93 10/18/93 10/18/93 10/19/93 <br /> Instrument I.D.#• HP-2 HP-2 HP-2 HP-2 SpectrAA-20 <br /> LCS % <br /> Recovery 1D4 100 99 101 83 <br /> ' Control Limits. 70-130 70-130 70-130 70-130 75-125 <br /> t <br /> r MS/MSD <br /> Batch # 3100638 3100638 3100638 3100638 3100640 <br /> rDate Prepared 10/18/93 10/18/93 10/18/93 10/18/93 10/16/93 <br /> Date Analyzed. 10/18/93 10/18/93 10/18/93 10/18/93 10/19/93 <br /> Instrument I D.#: HP-2 HP-2 HP-2 HP-2 SpectrAA-20 <br /> r Matrix Spike <br /> %Recovery 102 100 100 102 94 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 97 95 97 98 92 <br />' Relative% <br /> Difference 50 51 30 40 22 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matrix effects,the OC 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 /> 1 3100640 ROU X37 <br />