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SEQUOIA ANALYTICAL <br />680 Chesapeake Drive • Redwood City, CA 94063 <br />(415) 364-9600 • FAX (415) 364-9233 <br />-RESNA `Client ProjectID150054 01, Gorngan Propexrty{ <br />1710 Main Street Matra Solid <br />,, Escalon, CA 95320 <br />Attention John Lane OC Sample Group 31-60001-30 Reported Dec 27, 1993 <br />QUALITY CONTROL DATA REPORT <br />ANALWE Benzene <br />Toluene Ethyl . Xylenes <br />12/20/93 <br />Benzene <br />Method: EPA 8020 <br />EPA 8020 EPA 8020 EPA 8020 <br />Analyst: A. Tuzon <br />A- Tuzon A. Tuzon A Tuzon <br />MS/MSD <br />Batch#. 3120484 3120454 3120484 3120484 <br />Date Prepared: <br />12/20/93 <br />12/20/93 <br />12/20/93 <br />12/20/93 <br />Date Analyzed' <br />12/20/93 <br />12/20/93 <br />12/20/93 <br />12/20/93 <br />Instrument I.D #. <br />GCHP-4 <br />GCHP-4 <br />GCHP-4 <br />GCHP-4 <br />Conc. Spiked. <br />20 mg/kg <br />20 mg/kg <br />20 mg/kg <br />60 mg/kg <br />Matrix Spike <br />% Recovery: <br />103 <br />111 <br />102 <br />111 <br />Matrix Spike <br />Duplicate % <br />Recovery: <br />100 <br />109 <br />100 <br />110 <br />Relative % <br />Difference: <br />30 <br />18 <br />20 <br />090 <br />r <br />w �- a�14n vLwNc <br />aw n x 1 nn v <br />� � Vr <br />tr. S ry r~ St y r u v n ` i vnn x I r v l tiv r <br />LCS Batch#: <br />LCS122093 <br />LCS122093 <br />LC8122093 <br />LCS122093 ' <br />Date Prepared: 12/20/93 <br />Date Analyzed: 12/20/93 <br />Instrument 1.D #: GCHP-4 <br />LCS % <br />Recovery. 92 <br />12/20/93 <br />12/20/93 <br />12/20/93 <br />12/20/93 <br />12/20/93 <br />12/20/93 <br />GCHP-4 <br />GCHP-4 <br />GCHP-4 <br />99 <br />100 <br />102 <br />% Recovery <br />Control LimFts: 71-133 72-128 72-130 71-120 <br />SEQUOIA ANALYTICAL <br />U Y� <br />Vickie Ta e <br />Project Manager <br />'lease Note <br />The LCS is a control sample of known, interferent free matrix that is analyzed using the same reagents, <br />reparation, and analytical methods employed for the samples The matrix spike Is an aliquot of sample <br />)rtified with known quantities of specific compounds and subjected to the entire analytical procedure R <br />is recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br />iterference, the LCS recovery Is to be used to validate the batch <br />31-60001 WAT <5> <br />