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Sequoia 00 Chesapeake thrive Redwood C,iy CA 9406315) 364 9600 FAX (415) 364 9233 <br /> 15) 404 N W111171 Lane Walnut Geek CA 94598 510) 988 9600 FAX (510) 988 9673 <br /> 1I,W Analytical 819 Sinker Avcnuc Suac 8 Sacraincnto CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> Pacific Environmental Group, Inc Client Project 1D Chevron 9-6258, Stockton, CA <br /> 11315 Sunrise Gold Circle, #M Matrix Sol[ <br /> Rancho Cordova, CA 95742 <br /> Attention Dennis M Jones OC Sample Group 7050881-83 Reported May 30, 1997 <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 C Lee C Lee C Lee C Lee K Marchand <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# LCS052897 LCS052897 LCS052897 LCS052897 LCS052897 <br /> Date Prepared 05/28/97 05/26/97 05/28/97 05/28/97 05/26/97 <br /> Date Analyzed 05/28/97 05/28/97 05/28/97 05/28/97 05/29/97 <br /> Instrument 1 D # GCHP-1 GCHP 1 GCHP-1 GCHP 1 ICP-1 <br /> • LCS % <br /> Recovery 101 100 101 100 102 <br /> Control Limits 70-130 70 130 70-130 70 130 80 120 <br /> MS/MSD <br /> Batch # 7050387 7050387 7050387 7050387 7050388 <br /> Date Prepared 05/28/97 05/28/97 05/28/97 05/28/97 05/28/97 <br /> Date Analyzed 05/28/97 05/28/97 05/28/97 05/26/97 05/29/97 <br /> Instrument I D # GCHP 1 GCHP 1 GCHP 1 GCHP 1 ICP 1 <br /> Matrix Spike <br /> % Recovery 102 102 102 101 76 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 102 102 103 102 82 <br /> Relative % <br /> Difference 00 00 0 98 0 98 76 <br /> SE9y0IA ANALYT CAL Please Note <br /> / The LCS 1s a control sample of known interferent free matrix that 1s analyzed using the same reagents, <br /> Veider <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/MSas are advisory only <br /> inda C $Cand are not used to accept or reject batch results <br /> Project Manager/Sacramento Laboratory <br /> 7050881 PES <3> <br />