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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9Z33 <br /> i!D 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Sulte 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1665 FAX(707)792-0342 <br /> Roy F Weston, Inc Client Project ID SJC-HSA <br /> 2300 Clayton Rd , Ste 1580 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Karla Brasaemle OC Sample Group 8120941-948 Reported Dec 23, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst C Westwater C Westwater C Westwater C Westwater <br /> MS/MSD <br /> Batch#: 8120944 8120944 8120944 8120944 <br /> Date Prepared 12/17/98 12/17/98 12/17/98 12/17/98 <br /> Date Analyzed 12/17/98 12/17/98 12/17/98 12/17/98 <br /> Instrument I D # HP-9 HP-9 HP-9 HP-9 <br /> Conc Spiked 20}tg/L 20pg/L 20 fig/L 60pg/L <br /> Matrix Spike <br /> % Recovery. 105 105 110 113 <br />' Matrix Spike <br /> Duplicate% <br /> Recovery 100 105 105 110 <br /> Relative% <br /> Difference 4 9 0 0 47 30 <br /> I <br /> LCS Batch# 9LCS121798 9LCS121798 9LCS121798 9LCS121798 <br /> Date Prepared 12/17/98 12/17/98 12/17/98 12/17/98 <br /> Date Analyzed 12/17/98 12/17/98 12/17/98 12/17/98 <br /> Instrument 10 # HP-9 HP-9 HP-9 HP-9 <br /> LCS % <br /> Recovery 100 105 110 112 <br /> Recovery <br /> Control Limits 70-130 70-130 70-130 70-130 <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 /> l( <br /> iZ the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recoveryIs to be used to validate the batch <br /> ianne legiey <br /> Project Manager <br /> 8120941 RFW <3> <br /> r� <br />