Laserfiche WebLink
' Sequoia 690 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> A„7 Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Roy P Weston Client Project IIS San Joaquin County Capitol Projects <br />' 2300 Clayton Rd , Suite 1580 Matrix Soil <br /> Concord, CA 94520-2148 <br /> Attention David Marks CC Sample Group 5070280-286 Reported Jul 27, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 13020 EPA 8020 EPA 8020 <br />' Analyst C Chapman C Chapman C Chapman C Chapman <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch# LCS071895 LCS071895 LCS071895 LCS071895 <br /> Date Prepared 7/18/95 7/18/95 7/18/95 7/18/95 <br /> Date Analyzed 7/18/95 7/18/95 7/18/95 7/18/95 <br /> Instrument I D # GCHP-1 GCHP 1 GCHP-1 GCHP-1 <br /> • LCS <br /> Recovery 120 1 12521 <br /> Control Limits 75-125 75-125 75 75-125 <br /> MS/MSD <br /> Batch # 5070444 5070444 5070444 5070444 <br /> Date Prepared 7/18/95 7/18/95 7/18/95 7/18/95 <br /> Date Analyzed 7/18/95 7/18/95 7/18/95 7/18/95 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> % Recovery 110 113 112 112 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 114 115 116 115 <br />' Relative % <br /> Difference. 36 1 8 35 26 <br />' SEQUOIA ANALYTICAL Please Note <br /> J 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 1s used for <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> Linda C Schneider land are not used to acceptor reject batch results *Matrix interference <br /> Project Manager <br /> 5070280 ROY <6> <br />