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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive - Redwood City, CA 94063 <br /> (415) 364-9600 FAX(415) 364-9233 <br /> .......... <br /> ........... <br /> -x <br /> "-.'RESNA Client n't"Project ID: 150053.02, Stone Bros. <br /> ".1710 Main Street Matrix: Soil <br /> Escalon, CA 95320 <br /> 2" <br /> Attention: Greg Stahl OC Sample Group: 4A36601-5,7 Reported: Jan 12, 1994L"".�"� <br /> ..........- .......... <br /> xxx. . .... <br /> .................... <br /> . ........*—M WO <br /> x ...... <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> nalyst: T.Costello T.Costello T.Costello T.Costello <br /> MS/MSD <br /> Batch#: 4A16802 4A16802 4A16802 4A16802 <br /> Date Prepared: 1/10/94 1/10/94 1/10/94 1/10/94 <br /> Date Analyzed: 1/10/94 1/10/94 1/10/94 1/10/94 <br /> Instrument I.D.#: GCHP-6 GCHP-6 GCHP-6 GCHP-6 <br /> Conc. Spiked: 0.20 mg/kg 0.20 mg/kg 0.20 mg/kg 0.60 mg/kg <br /> Matrix Spike <br /> %Recovery: a5 85 90 90 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 80 80 85 82 <br /> Relative% <br /> Difference: 6.1 6.1 5.7 9.3 <br /> ............................... ............ <br /> ............. .................. <br /> ..... ..... <br /> .......... <br /> ........................... <br /> .......... <br /> LCS Batch#: <br /> Date Prepared: <br /> Date Analyzed: <br /> Instrument I.D.#: <br /> LCS % <br /> Recovery: <br /> %Recovery <br /> Control Limits: 55-145 47-149 47-155 56-140 <br /> Please Note: <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples, The matrix spike is an aliquot of sample <br /> fortified with knokn quantities of specific compounds and subjected to the entire analytical procedure. If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> finterference,the LCS recovery is to be used to validate the batch, <br /> Vickie Tague <br /> Project Manager 4A3660I.WAT <3> <br />