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Sequoia680 Chesapeake DaCry, <br /> Drive Redwood ,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 /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> &16felder C lent Project l0 20-3941-01 to <br /> 2825 East Myrtle St Matrix Soil <br /> Stockton, CA 95205 <br /> Attention Tony Martin QC Sample Group 7030697-736 Reported Mar 27, 1997 <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 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch# LCSM2497 LCSM2497 LCS032497 LCS032497 <br /> Date Prepared- 03/24/97 03/24/97 03/24/97 03/24/97 <br /> Date Analyzed 03/24/97 03/24/97 03/24/97 03/24/97 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS % <br /> Recovery 74 76 79 82 <br /> Control Limits 70-130 70-130 70-130 70.130 v <br /> v ft <br /> ' MS/MSD <br /> Batch# 7030736 7030736 7030736 7030736 <br /> Date Prepares[ 03/24/97 03/24/97 03/24/97 03/24/97 <br /> Date Analyzed 03/24/97 03/24/97 03/24/97 03/24/97 <br /> Instrument I D.# GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> ' Matrix Spike <br /> % Recovery 77 83 90 95 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery so 84 91 93 <br /> ' Relative% <br /> Difference 38 12 1 1 21 <br /> EQUOIA ANALYTICAL Please Note <br /> The LGS 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 /> valldatlon of sample batch results Due to matrix effects,the 4C limits for MS/MSDs are advisory only <br /> Edana M l=ruclarlo � and are not used to accept or reject batch results <br /> Protect Manager/Sacramento LaboraRory <br /> 7030697 KLF <16> <br />