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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord <br /> California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> G1 }r'�+�c.,- �:"":ryaa <br /> tni Associates C1i41ifP1 o{ectry YD Arco X09 =1Y/Tracy <br /> 855 Gateway Blvd , Ste 770 Matrix <br /> oncord, CA 94520 <br /> Attention Paul Supple OC Sample Goup 3071018-25 Reported Aug 3, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-Ehchioroethene Trichloroethene Chloro- <br /> benzene <br /> ' Method <br /> EPA 8010 EPA 8010 EPA 8020 <br /> ' Analyst' K Nil' K NGII K Nall <br /> Conc Spiked 10 10 10 <br /> Units- vg/Kg jig/Kg deg/Kg <br /> ' LCS Batch#. LCS073193 LCS073193 LCS073193 <br /> Date Prepared: 7/31/93 7/31/93 7/31/93 <br /> Date Analyzed 7/31/93 7/31/93 7/31/93 <br /> Istrument I D #: HP-7 HP-7 HP-7 <br /> 10 LCS °.6 <br /> Recovery- 110 100 96 <br /> Control Limits 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch #: 3071023 3071023 3071023 <br /> Date Prepared: 7/31/93 7/31/93 7/31/93 <br /> Date Analyzed: 7/31/93 7/31/93 7/31/93 <br />�strument I D #. HP-7 HP-7 HP-7 <br /> Matrix Spike <br />' % Recovery: 96 120 110 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 100 130 120 <br /> Relative % <br />' Difference 41 80 87 <br /> QUOIA YTICAL Please Note <br /> Zhotrot sam leo nown,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 OC limits for MS/MSD s are advisory only <br /> lenneth K F Lee and are not used to accept or reject batch results <br /> Laboratory Director <br /> 1 3071018 ROU <9> <br />