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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> n"ux Associates "Client Project ID Arco 2093-93-1,Tracy <br /> 5 Gateway Blvd , Ste 770 Matrix Soil <br /> Concord, CA 94520 <br /> Attention Paul Supple OC Sample Group 3080351-352 Reported Aug 13, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method. EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst J F J F J F J F <br /> Conc. Spiked. 040 040 040 12 <br /> Units: mg/Kg mg/Kg mg/Kg mg/Kg <br /> ' LCS Batch#. 1LCS081293 ILCS081293 ILCS081293 ILCS081293 <br /> Date Prepared 8/12/93 8/12/93 8/12/93 8/12/93 <br /> Date Analyzed. 8/12/93 8/12/93 8/12/93 8/12/93 <br /> ristrument I D#. HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> 10 Recovery 96 107 111 122 <br /> Control Limits: 70-130 70-130 70-130 70-130 <br /> ti~n v r ♦ ♦ r v r ' r r ` v r n `.-. .v.4 r .. . n} `v . 1 t ` <br /> ' MS/MSD <br /> Batch#: 3080435 3080435 3080435 3080435 <br /> Date Prepared, 8/12/93 8/12/93 8/12/93 8/12/93 <br /> Date Analyzed 8/12/93 8/12/93 8/12/93 8/12/93 <br /> nstrument I D.# HP-2 HP-2 HP-2 HP-2 <br /> ' Matrix Spike <br /> % Recovery: 100 95 95 100 <br /> ' Matrix Spike <br /> Duplicate% <br /> Recovery: 100 100 100 103 <br /> ' Relative % <br /> Difference 00 51 51 3 0 <br /> t11E(01U0IA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> preparation 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/MSDs are advisory only <br /> and are not used to accept or reject batch results <br /> Kenneth K F Lae <br /> Laboratory Director <br /> I <br /> #3080351 ROU <2> <br />