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Sequoia 680 Chesapeake Drive RedwoodCity CA 94063 (650)364 9600 FAX(650) 364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510)988 9600 FAX(510)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-034 2 <br /> Gettler Ryan/Geostrategies Client Project ID Unocal 5421, Stockton <br /> 6747 Sierra Court, Ste J Matrix Solid <br /> Dublin, CA 94568 <br /> Attention Clyde Galantine Work Order# 9804A13-01 Reported May 4, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte 1,1-Dichloroethene Trichloroethene Benzene Toluene Chloro- <br /> benzene <br /> QC Batch# MSO415988240EXA MSO415988240EXA MSO415988240EYA MSO415988240EXA MSO415988240EXA <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 E Manuel E Manuel E Manuel E Manuel E Manuel <br /> MS/MSD# 980482401 980482401 980482401 980482401 980482401 <br /> Sample Cone N D N D N D N D N D <br /> Prepared Date. 4/15/98 4/15/98 4/15/98 4/15/98 4/15/98 <br /> Analyzed Date 4/15/98 4/15/98 4/15/98 4/15/98 4/15/98 <br /> Instrument I D # F2 F2 F2 F2 F2 <br /> Cone Spiked 2500pg/Kg 25OOpg/Kg 2500 Erg/Kg 2500 jig/Kg 2500 Ng/Kg <br /> Result 2000 2200 2500 2300 2400 <br /> MS % Recovery 80 88 100 92 96 <br /> Dup Result 2100 2300 2700 2400 2400 <br /> MSD % Recov 84 92 108 88 96 <br /> RPD 49 44 77 43 00 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # LCSO41698 LCSO41698 LCSO41698 LCSO41698 LCSO41698 <br /> Prepared Date 4/16/98 4/16/98 4/16/98 4/16/98 4/16/98 <br /> Analyzed Date 4/24/98 4/24/98 4/24/98 4/24/98 4/24/98 <br /> Instrument 1 D # F3 F3 F3 F3 F3 <br /> Cone Spiked 2500E1g/Kg 2500 fug/Kg 2500 fug/Kg 2500 fig/Kg 2500 Erg/Kg <br /> LCS Result 2400 2400 2800 2600 2600 <br /> LCS % Recov 96 96 112 104 104 <br /> 60-140 60-140 60-140 60-140 60-140 <br /> LCS 65-135 70-130 70-130 70-130 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 />•SEQUOIA ANALYTICAL 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 /> F the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> i interference,the LCS recovery 1s to be used to validate the batch <br /> egory **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference <br /> Project Manager 9804A13 GET t2> <br />