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Sequoia 680 Chesapeake Dnve Redwood Cery CA 94063 (650) 364 9600 FAX(650)364-92 <br /> 4D <br /> 404 ISI W+get Lane Walnut Creek CA 94598 (510) 988 9600 FAX(5 10)988 96 <br /> 4 /A nal3niCal 819 Stnker Avenue Suite 8 Sacramento CA 95934 (916) 921 9600 FAX(916)921 0R <br /> Pacific Environmental Group Client Project ID 920-119 119/Chevron 9-6171, Stockton, CA <br /> 11315 Sunrise Gold Circle, Ste M Matrix Soil <br /> Rancho Cordova, CA 95742 <br /> Attention Tim Anenson WC Sample Group 8010315-0335, 0337-0345 Reported Jan 15, <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene BenzeneX lines <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch# LCS011498 LCS011498 LCS011498 LCS071498 <br /> Date Prepared 01/14/98 01/14/98 01/14/98 01/14/98 <br /> Date Analyzed 01/14/98 01/14/98 01/14/98 01/14/98 <br /> Instrument I Dom+# GCHP 2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS <br /> Recovery <br /> 100 sa 98 97 <br /> Control Lrmlts 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch# 8010328 8010328 8010328 8010328 <br /> Date Prepared 01/14/98 01/14/98 01/14/98 01/14/98 <br /> Date Analyzed 01/14/98 01/14/98 01/14/98 01/14/98 <br /> Instrument I.D.# GCHP-2 GCHP 2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery 81 83 a5 85 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery- 81 83 86 85 <br /> Relative% <br /> Difference 00 00 12 00 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS 1s a control sample of known,interferent free matrix that 1s analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LCS%recovery data 1s used for <br /> GL.E validation of sample batch results Due to matrix effects,the QC limits for MS/MSDs are advisory only <br /> inda C Schneider and are not used to accept or refect batch results <br /> Project Manager/Sacramento Labora ory <br /> � 8010315 PES <15> <br />