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Sequoia 690 ChcsapeaKe Dnve Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Wainut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> V*jr Analytical 319 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> • Brown & Caldwell Client Project ID Arco 2133 Stockton <br /> 9616 Micron Ave Suite 600 Matrix Water <br /> Sacramento CA 95827 <br /> Attention Mindy Patterson OC Sample Group 506-0791 Reported Jun 27 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyi- <br /> Benzene Toluene Benzene Xylenes TRPH Lead <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 418 1 EPA 200 7 <br /> Analyst C Lee C Lee C Lee C Lee V Owens K Barta <br /> Concentration <br /> Spiked- 10 ug/L 10 ug/L 10 ug/L 30 ug/L 4 0 mg/L 0 50 mg/L <br /> LCS Batch# LCS061995 LCS061995 LCS061995 LCS061995 LCS062395 LCS062495 <br /> Date Prepared. 6/19/95 6/19/95 6/19/95 6/19/95 6/23/95 6/24/95 <br /> Date Analyzed 6/19/95 6/19/95 6/19/95 6/19/95 6/26/95 6/27/95 <br /> Instrument I D.# GCHP-2 GCHP-2 GCHP-2 GCHP-2 IR-1 P-40 <br /> LCS % <br /> Recovery- 91 92 93 92 90 94 <br /> Control Limits: 75-125 75-125 75-125 75-125 80-120 80.120 <br /> MS/MSD <br /> Batch{#- 5060807 5060807 5060807 5060807 BS062395 5060899 <br /> Date Prepared- 6/19/95 6/19/95 6/19/95 6/19/95 6/23/95 6/24/95 <br /> Date Analyzed 6/19/95 6/19/95 6/19/95 6/19/95 6/26/95 6/27/95 <br /> Instrument I.D.# GCHP-2 GCHP-2 GCHP-2 GCHP-2 IR-1 P-40 <br /> Matrix Spike <br /> % Recovery: 89 91 93 91 90 91 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery- 91 91 95 93 89 92 <br /> Relative % <br /> Difference- 22 00 21 22 1 1 10 <br /> SEQUOIA ANALYTICAL Please Note <br /> • r f The LCS 1s 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%recovery data Is used for <br /> "((( 11WYv1�vv-viii 6"v— validation of sample batch results Due to matnx effects,the QC limits for MS/MSDs are advisory only <br /> Janet Tian and are not used to accept or reject batch results <br /> Project Manager <br /> 5060791 BRS <4> <br />