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' Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415)364 9233 <br /> 4o4 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX (916)921-0100 <br /> Y rKSyiryK > n � IA finfi � !v > v <br /> kpgi,radient tnvironrnental Tient project lb "Apache kastics <br />' P p Box 8002 Matrix Water <br /> Stockton, CA 95208 <br /> Attention Vic Cherven OC Sample Group 7060537-0540 Reported Jun 27, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene x lenes <br /> Method' EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> ' Analyst' M Chiaravallob M Chiaravallott M Chiaravallot M Chtaravallob <br /> Concentration <br /> Spiked- 10 ug/L 10 ug/L 10 ug/L 30 u9/L <br /> ' LCS Batch# LCS061997 LC6061997 LCS061997 LCS061997 <br /> Date Prepared' 06/19/97 06/19/97 D6/19/97 06/19/97 <br /> ' Date Analyzed' 06/19/97 06/19/97 06/19/97 06/19/97 <br /> Instrument 1.13 # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS % <br /> Recovery: 112 105 104 103 <br /> Control Limits: 70-130 7D-130 70-130 70-130 <br /> MS/MSD <br /> ' Batch #: 7060413 7060413 7060413 70W413 <br /> Date Prepared 06/19/97 06/19/97 06/19/97 06/19/97 <br /> Date Analyzed' 06/19/97 06/19/97 06/19/97 06/1.9/97 <br /> Instrument LD #' GCHP-1 GGHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> ' %Recovery. 107 101 100 100 <br /> Matrix Spike <br /> ' Duplicate% <br /> Recovery 111 104 103 104 <br /> Relative % <br /> ' Difference' 37 29 30 39 <br /> SECT IA ANALYTICAL - Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> i 1 preparation and analytical methods employed for the samples The LOS%recovery data is used for <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> dana M Fruciano and are not used to accept or reject batch results <br /> Project Manager/Sacramento Laborsory <br /> 7060537 UUU <4> <br /> s <br />