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!f <br /> 4D Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 %73 <br /> qW Analytical 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921-0100 <br /> • �MCON Client Project 11) Arco 548, Stockton, CA <br /> 1433 N Market Blvd Matrix Water <br /> Sacramento, CA 95834 <br /> Attention Dave Foley OC Sample Group 8020455-0460 Reported Mar 4, 1998>> <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Et"- <br /> Benzene Toluene Benzene Xylenes MTBE <br /> Method: EPA 8020 EPA 6020 EPA 8020 EPA 8020 EPA 8260 <br /> Analyst LMB LMB LMB LMB K Pocan <br /> Concentration <br /> Spiked- 10 ug/L 10 ug/L 10 ug/L 30 ug/L 50 ug/L <br /> LCS Batch#: LCS022398 LCS022398 LCS022398 LCS022398 LCS022698 <br /> Date Prepared. 02/23/98 02/23/98 02/23/98 02/23/98 02/26/98 <br /> Date Analyzed: 02/23/98 02/23/98 02/23/98 02/23/98 02/26/98 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 MS-F1 <br /> LCS % <br /> Recovery 91 89 86 85 110 <br /> Control Limits: 70-130% 70-130% 70-130% 70-130% 70-130% <br /> MS/MSD <br /> Batch#- 8020458 8020458 8020458 8020458 BS022698 <br /> Date Prepared' 02/23/98 02/23/98 02/23/98 02/23/98 02/26/98 <br /> Date Analyzed• 02/23/98 02/23/98 02/23/98 02/23/98 02/26/96 <br /> Instrument I D #• GCHP-2 GCHP-2 GCHP-2 GCHP-2 MS-F1 <br /> Matrix Spike <br /> % Recovery: 96 93 92 90 110 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 100 99 97 95 124 <br /> Relative% <br /> Difference: 41 6 2 5 3 54 12 <br /> SEQUOIA ANALYTICAL Please Note <br /> / 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%recovery data is used for <br /> validation of sample batch results due to matrix effects,the OC limits for MS/MSG's are advisory only <br /> Ronaid W Sobel and are not used to accept or refect batch results <br /> Project Manager/Sacramento Labors ory <br /> ,g[ 8020455 EMC <4> <br /> �Sd' <br />