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Sequoia 680 Chesapeake Drive Redwood City cA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> (D 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> BIW Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Delta Environmental Consultants Client Project ID Exxon #7-3708, Stockton, CA <br /> 3164 Gold Camp Dr, Suite 200 Matrix Soil <br /> Rancho Cordova, CA 95670 <br /> Attention Todd Galati QC Sample Group 6010001-9 Reported Jan 4 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Lead <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 6010 <br /> Analyst: J Padilla J Padilla J Padilla J Padilla K Barta <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg 50 mg/kg <br /> LCS Batch# LCS010296 LCS010296 LCS010296 LCS010296 LCS010296 <br /> Date Prepared 1/2/96 1/2/96 1/2/96 1/2/96 1/2/96 <br /> Date Analyzed 1/2/96 1/2/96 1/2/96 1/2/96 1/3/96 <br /> strument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 lCP-1 <br /> LCS % <br /> Recovery 95 95 95 97 93 <br /> Control Limits 75-125 75-125 75-125 75-125 80-120 <br /> MS/MSD <br /> Batch # 9512H03-2 95121-103-2 95121-103-2 9512H03-2 6010007 <br /> Date Prepared 112/96 1/2/96 1/2/96 1/2/96 1/2/96 <br /> Date Analyzed 1/2/96 1/2/96 1/2/96 1/2/96 1/3/96 <br /> Instrument I ❑ # GCHP-1 GCHP-1 GCHP-1 GCHP-1 ICP 1 <br /> Matrix Spike <br /> % Recovery 85 85 85 87 79 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 85 85 85 87 87 <br /> Relative % <br /> Difference 00 00 00 00 96 <br /> &EQUOIA ANALYTICAL. Please Note <br /> - l 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 o recovery data is useryfor <br /> (�I validation of sample batch results Due to matrix effects the QC limits for MS MSDs are adviso only <br /> Linda C Schneider and are not used to accept or reject catch results <br /> J Project Manager/Sacramento Laboratory <br /> 6010001 DLT <-t> <br />