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Sequoia 1-1-480 Chesapeake Drive Redwood City;CA 94063 (415) 364-9600 FAX(415) 364-9233 <br /> 4114 N.Wig,t Lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510)988-9673 <br /> Analytical <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921-0100 <br /> qwr <br /> ......................... <br /> Services........... Client Pribi 66H nocal #5421,...1903'pacific' 'Av6.','N&kton- <br /> 2401 Stanwell Dr., Ste. 300 Matrix- Liquid <br /> Concord, CA 94520 <br /> Attention: Sarkis Karkarian QC Sample Group: 5060592-596 Reported: Jun 23, 1995';:; <br /> ............... <br /> X., . ...................... <br /> ............ ........... ... .... <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 Mod <br /> Analyst: A.Tuzon A.Tuzon A.Tuzon A.Tuzon J. Dinsay <br /> MS/MSD <br /> Batch#: 5060592 5060592 5060592 5060592 BLK061395 <br /> Date Prepared: 6/12/95 6/12/95 6/12/95 6/12/95 6/13/95 <br /> Date Analyzed: 6/12/95 6/12/95 6/12/95 6/12/95 6/14/95 <br /> Instrument I.D.#: HP-5 HP-5 HP-5 HP-5 GCHP-3B <br /> Conc. Spiked: 20 pg/L 20 jug/L 20 pg/L 60 pg/L 300pg/L <br /> Matrix Spike <br /> % Recovery: 95, 100 105 105 90 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 100 105 105 107 83 <br /> Relative% <br /> Difference: 5.1 4.9 010 1.9 8.1 <br /> ......... <br /> ......................... -x <br /> xx <br /> 'X. <br /> ...........X.. <br /> .......... <br /> LCS Batch#: 3LCS061295 3LCS061295 31-C-S061295 3LCS061295 BLK061395 <br /> Date Prepared: 6/12/95 6/12/95 6/12/95 6/12/95 6/13/95 <br /> Date Analyzed: 6/12/95 6/12/95 6/12/95 6/12/95 6/14/95 <br /> Instrument I.D.#,. HP-5 HP-5 HP-5 HP-5 GCHP-3B <br /> LCS % <br /> Recovery: 99 100 103 104 90 <br /> Recovery <br /> Control Limits: 71-133 72-128 72.130 71-120 38-122 <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 /> Signature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recove!y is to be used to validate the batch. <br /> Alan B. Kemp <br /> Project Manager <br /> 5060592.MPD <5> <br />