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' Sequoia • 680 Chesapeake Drive Redwood City,CA 90 (4t5) 364-9600 FAX(415)364-9233 <br /> 404 N Wget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)998-%73 <br /> Analytical 819 Straker Avenuc Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br />%pgradient Client Project ID Apache plastics <br /> t1017 26th St Matrix Water <br /> Sacramento, CA 95816 <br /> Attention Vic Cherven QC Sample Group 6052036-42 Reported Jun 5, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br />' Analyst V Owens V Owens V Owens V Owens <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> ' LCS Batch# LCS060496 LCS060496 LCS060496 LCS060496 <br /> Date Prepared 06/04/96 06/04/96 06/04/96 06/04/96 <br /> ' Date Analyzed 06/04/96 06/04/96 06/04/96 06/04/96 <br /> Instrument I D # GCHP-7 GCHP-7 GCHP-7 GCHP 7 <br /> LCS % <br /> Recovery 92 93 92 90 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> ' Batch# 6060001 6060001 6060001 6060001 <br /> Date Prepared 06/04/96 06/04/96 06/04/96 06/04/96 <br /> Date Analyzed. 06/04/96 06/04/96 06/04/96 06/04/96 <br /> Instrument I.D# GCHP 7 GCHP-7 GCHP-7 GCHP-7 <br /> Matrix Spike <br /> %Recovery 90 88 93 87 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 87 85 85 88 <br /> Relative% <br /> Difference 22 35 90 11 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSQ's are advisory only <br /> ' Margie Namba and are not used to accept or reject batch results <br /> Project Manager/Sacramento Labora ory <br /> 6052036 UPS <4> <br />