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Sequoia680 Chesapeake Drive Redwood City,CA 94063 (415) 364-9600 FAX(415) 364-9233 <br /> 4114 N.Wiget Lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510)988-9673 <br /> a. <br /> Analytic1 819 Striker Avenue,Suite 8 Sacramento,CA 951134 (916) 921-9600 FAX(916)921.0 10() <br /> 8 SerVICes 'Client Pr-ojectfl[):­ -ro- s- co#0788, 8203 E. 11th St. Tracy <br /> 2401 Stanwell Dr., Ste. 300 Matrix: Liquid <br /> '.' Concord, CA 94520 <br /> Attention: Jarrel Crider QC Sample Group: 7050462-471 Reported: May 23, 19971%'. <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes Diesel <br /> Benzene <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015 <br /> Analyst: K.Nill K.Nill K.Nill K. Nill D.Sharma <br /> MS/MSD <br /> Batch#: 7050462 7050462 7050462 7050462 BLK051397 <br /> Date Prepared: 5/12/97 5/12/97 5/12/97 5/12/97 5/13/97 <br /> Date Analyzed: 5/12/97 5/12/97 5/12/97 5/12/97 5/15/97 <br /> Instrument I.D.#: HP-5 HP-5 HP-5 HP-5 HP-3A <br /> Cone. Spiked: 20pg/L 20pg/L 2opg/L 60 pg/L 300pg/L <br /> Matrix Spike <br /> % Recovery: 90 80 85 83 63 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 100 90 95 90 97 <br /> Relative % <br /> Difference: 11 12 11 8-0 15 <br /> ............. <br /> ............ <br /> LCS Batch#: 5LCS051297 5LCS051297 5LCS051297 5LCS051297 5LCS051297 <br /> Date Prepared: 5/12/97 5/12/97 5/12/97 5/12/97 5/13/97 <br /> Date Analyzed: 5/12/97 5/12/97 5/12/97 5/12/97 5/15/97 <br /> Instrument I.D.#: HP-5 HP-5 HP-5 HP-5 HP-3A <br /> LCS % <br /> Recovery: 90 80 85 85 100 <br /> % Recovery <br /> Control Limits: 70.130 70-130 70-130 70-130 50-150 <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, #1271 preparation,and analytical methods employed for the samples. The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure. If <br /> Onature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch. <br /> Alan B. Kemp <br /> Project Manager <br /> 7050462.MPD <5> <br />