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680 Chesapeake Drive Redwood CityCA 94063 (650) 364 9640 FAX(650)364-9233 <br /> Sequoia 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 (906)921 9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707) 792 1865 FAX(707)792-0342 <br />• <br /> Gettler Ryan/Geostrategies Client Project ID Unocal 5421, 140162 02 <br /> 6747 Sierra Court, Ste J Matrix Solid <br /> Dublin, CA 94568 <br /> Attention Clyde Galantine Work Order # 9804C43-03 Reported May 4, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte 1,1-Dichloroethene Trichloroethene Benzene Toluene Chloro- <br /> benzene <br /> QC Batch# MSO423988240EXA MSO423988240EXA MSO423988240EXA MSO423988240EXA MSO423988240EXA <br /> Analy Method EPA 8240 EPA 8240 EPA 8240 EPA 8240 EPA 8240 <br /> Prep Method N A N A N A N A N A <br /> Analyst L Zhu L Zhu L Zhu L Zhu L Zhu <br /> MS/MSD # 9804C4301 980404301 980404301 9804C4301 9804C4301 <br /> Sample Conc N D N D 6900 8300 N D <br /> Prepared Date 4/23/98 4/23/98 4/23/98 4/23/98 4/23/98 <br /> Analyzed Date 4/24/98 4/24/98 4/24/98 4/24/98 4/24/98 <br /> Instrument I D # F3 F3 F3 F3 F3 <br /> Conc Spiked 2500 ug/Kg 2500 ug/Kg 2500 Ng/Kg 2500 ug/Kg 2500 ug/Kg <br /> Result * -* <br /> MS% Recovery <br /> • * _* <br /> Dup Result <br /> MSD % Recov <br /> RPD <br /> RPD Limit <br /> *MS/MSD diluted due to matrix interference <br /> LCS # LCSO42398 LCSO42398 LCSO42398 LCSO42398 LCSO42398 <br /> Prepared Date 4/23/98 4/23/98 4/23/98 4/23/98 4/23/98 <br /> Analyzed Date 4/27/98 4/27/98 4/27/98 4/27/98 4/27/98 <br /> Instrument 1 D # F3 F3 F3 F3 F3 <br /> Conc. Spiked 2500 ug/Kg 2500 ug/Kg 2500 erg/Kg 2500 jig/Kg 2500 Mg/Kg <br /> LCS Result 55 51 57 53 53 <br /> LCS % Recov 110 102 114 106 106 <br /> 60-140 60 140 60-140 60-140 60-140 <br /> LCS 65-135 70.130 70-130 70130 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> •SEQUOI ALYTICAL preparation and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Gregory **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference <br /> Project Manager 9804C43 GET <2> <br />