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Sequoia 060 ChcsavcaKe Dnvc �cdwooct City CA 94063 4151 364 9600 FAX(4t5) 364 9233 <br /> 404 N W,gct Lane Walnu[Creek CA 94598 �51D1 983 9600 FAX(510)988 9673 <br /> WAIV Analytical 319 Striker Avcnue wise 8 Sacramento CA 95834 (9 16) 921 9600 FAX(916)921 0100 <br /> Brown & Caldwell Client Project ID Arco 434, Lodi <br /> 9616 Micron Ave , Suite 600 Matrix Air <br /> Sacramento CA 95827 <br /> Attention Mindy Patterson OC Sample Group 5070217-218 Reported Jul 13, 1995 <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 C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked 2 0 mg/ma 2 0 mg/ml 2 0 mg/m3 6 0 mg/m3 <br /> LCS Batch# LCS071095 LCS071095 LCS071095 LCS071095 <br /> Date Prepareo- 7/10/95 7/10/95 7/10/95 7/10/95 <br /> Date Analyzed 7/10/95 7/10/95 7/10/95 7/10/95 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP 2 <br /> • LCS °1° <br /> Recovery 96 96 sa 97 <br /> Control Limrts- 75-125 75-125 75-125 75-125 <br /> x v n .. v x y r r + r ..+ . n n tw x.a Y/rN.'�+'Yi0606r+eW ur..vnrrnwn lAi <br /> MS/MSD <br /> Batch# BS071095 BS071095 OS071095 BS071095 <br /> Date Prepared 7/10/95 7/10/95 7/10/95 7/10/95 <br /> Date Analyzed 7/10/95 7/10/95 7/10/95 7/10/95 <br /> Instrument I D-# GCHP-2 GCHP 2 GCHP 2 GCHP-2 <br /> Matrix Spike <br /> % Recovery: 96 96 98 97 <br /> Matnx Spike <br /> Duplicate% <br /> Recovery- 94 95 99 99 <br /> Relative% <br /> Difference: 21 10 00 20 <br /> SE000IA ANALYTICAL Please Note <br /> The LCS is a control sample of known Interferent free matrix that is analyzed using the same reagents, <br /> �i 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 OC limits for MS/MSD's are advisory only <br /> Janet Tian and are not used to accept or relent batch results <br /> Project Manager <br /> 5070217 BRS <2> <br />