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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord,California 94520 <br /> (510) 686.9600 • FAX (510) 686-9689 <br /> Iton Geosclence Client Project ID: Former Mobil 04342/30-0135 <br /> X30-A Lindbergh Ave. Matrix. Water <br /> Livermore, CA 94550 <br /> >' Attention: Stephan Rosen CC Sample Group: 3101633-1644 Reported: Nov 8, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> N LYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Diesel <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015 <br /> Analyst: J.F. J.F. J.F. J.F. K.Wimer <br /> Conc. Spiked: 20 20 20 60 300 <br /> Units: p9/L j+9/L k9/L u9/L Pg/L <br /> LCS Batch#: 1LCS110493 1LCS 110493 1LCS11D493 1LCS110493 BLK110493 <br /> Date Prepared: 11/4/93 11/4/93 11/4/93 11/4/93 11/4/93 <br /> Date Analyzed: 11/4/93 11/4/93 11/4/93 11/4/93 11/8/93 <br /> Instrument I.D.#: HP-2 HP-2 HP-2 HP-2 HP-38 <br /> LCS% <br /> Recovery: 107 104 107 109 98 <br /> Control Limits: 70-130 70.130 70-130 70-130 60-120 <br /> ..:.:.....:.:... <br /> MS/MSD <br /> Batch#: M53101633 MS3101633 MS3101633 MS31016M BLK110493 <br /> Date Prepared: 11/4/93 11/4/93 11/4/93 11/4/93 11/4/93 <br /> Date Analyzed: 11/4/93 11/4/93 11/4/93 11/4/93 11/8/93 <br /> Instrument I.D.#: HP-2 HP-2 HP-2 HP-2 HP-38. <br /> Matrix Spike <br /> %Recovery: 115 110 110 110 98 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 110 105 106 107 101 <br /> Relative% <br /> Difference: 4.4 4.7 4.7 2.8 3.0 <br /> ScQUOIAANALYTICAL Plaasa Nola: <br /> The LCS is a control sample of known,interferent tree 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 OC limits for MS/MSD's are advisory only <br /> and are not used to accept or reject batch results. <br /> Karen L Enstrom _ <br /> Project Manager <br /> 3101633.ALT <5, <br />