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�R <br /> Sequoia 680 Chesapeake Drive Redwood City.CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> 404 N.Wiget Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 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 /> Blaine Tech Services, Inc. Client Project ID: Chevron 9-0557/ 980609-J2 <br /> 1680 Rogers Ave. Matrix: Liquid <br /> San Jose, CA 95112 <br /> Attention: Fran Thie CC Sample Group: 9806642-09, 10 Reported: <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method: EPA 8020A EPA 8020A EPA 8020A EPA 8020A <br /> Analyst: N.Zahedi N.Zahedi N.Zahedi N. Zahedi <br /> MS/MSD <br /> Batch#: LCS061798 LCS061798 LCS061798 LCS061798 <br /> Date Prepared: 6/17/98 6/17/98 6/17/98 6/17/98 <br /> Date Analyzed: 6/17/98 6/17/98 6/17/98 6/17/98 <br /> Instrument I.D.#: HP1 HP1 HP1 HPI <br /> Conc. Spiked: 20 pg/L 20 pg/L 20 pg/L 60 pg/L <br /> Matrix Spike <br /> % Recovery: 93 93 92 93 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 86 93 94 93 <br /> Relative % <br /> Difference: 7.8 0.0 2.2 0.0 <br /> LCS Batch#: LCS061798 LCS061798 LCS061798 LCS061798 <br /> Date Prepared: 6/17/98 6/17/98 6/17/98 6/17/98 <br /> Date Analyzed: 6/17/98 6/17/98 6/17/98 6/17/98 <br /> Instrument l.D.#: HP1 HP1 HP1 HP1 <br /> LCS % <br /> Recovery: 93 93 92 93 <br /> % Hecovery <br /> Control Limits: 60-140 60-140 60-140 60-140 <br /> Please Note: <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known,'interferent free matrix that is analyzed using the same reagents, <br /> Elap#2 0 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 /> i <br /> the recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch. <br /> gory <br /> r ject Manager 9806642.BLA <3> <br /> T� <br />