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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wlget Lane Walnut Creek CA 94598 (925)988-9600 FAX(9Z5)988-9673 <br /> �illll► Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Ploy P Weston, Inc Client Project Ib SJC-HSA <br /> 2300 Clayton Rd , Ste 1580 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Karla Brasaemle OC Sample Group 8120941-946 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# 8121250 8121250 8121250 8121250 <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-5 HP-5 HP-5 HP 5 <br />' Conc Spiked: 20ug/L 20 frg/L 20Ng/L 60 jig/L <br /> Matrix Spike <br /> % Recovery: 95 100 100 102 <br /> tMatrix Spike <br /> Duplicate% <br /> Recovery- 85 90 90 95 <br /> Relative % <br /> Difference. 11 11 11 68 <br /> 1 <br /> LCS Batch# 5LCS121798 5LCS121798 5LCS121798 5LGS121798 <br /> Date Prepared 12/17/98 12/17/98 12/17/98 12/17/98 <br /> tDate Analyzed. 12/17/98 12/17/98 12/17/98 12/17/98 <br /> Instrument I D #' HP-5 HP-5 HP-5 HP-5 <br /> LCS % <br />' Recovery: 90 95 95 102 <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 U the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br />' d interference,the LCS recovery is to be used to validate the batch <br /> 4.1,'ann. Fegley <br /> Project Manager <br />' 8120941 RFW <2> <br />