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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (4151 364 9600 FAX (415) 364 9233 <br /> 404 11 Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (5tO) 988 9673 <br /> %70 An.alytieal 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921-9600 FAX (916) 921 0100 <br /> rF � 4`4 <br /> 'Delta Environmental Consultants CllentVProlect ID Exxon 7-3708, D093-809 <br /> 3164 Gold Camp Drive, #200 Matrix Solid <br /> Rancho Cordova, CA 95670 <br /> Attention Keoni Almeida Work Order# 9705525-01, 02 Reported May 19, 1997 <br /> {v w ♦YG Sf f.r+ M1 w r •Yxwv..{� Ih r vk r� +}v r r� <br /> QUALITY CONTROL DATA REPORT <br /> Analyte. 1,1-Dichloroethene Tnchloroethene Benzene Toluene Chloro- <br /> benzene <br /> QC Batch# MS0512978240EXA MS0512978240EXA MSM12978240E(A MS0512978240EXA MS0512978240EKA <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: M Williams M Williams M Williams M Williams M Williams <br /> MS/MSD #- 970535002 970535002 970535002 970535002 970535002 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date. 5/12/97 5/12/97 5/12/97 5/12/97 5/12/97 <br /> Analyzed Date 5/12/97 5/12/97 5/12/97 5/12/97 5/12/97 <br /> Instrument I D # F3 F3 F3 F3 F3 <br /> Conc Spiked 2500 pg/Kg 2500 ug/Kg 2500 yg/Kg 25500 N9/K9 2500 N9/Kg <br /> Result: 1900 2000 2100 2200 2100 <br /> MS % Recovery 76 so 154 88 84 <br /> Dup Result- 1900 2000 2100 2100 2100 <br /> MSD % Recov .. 76 80 84 134 84 <br /> RPD 00 00 00 49 00 <br /> RPO Limit: 0-25 0-25 0-25 a25 0-25 <br /> +r r +.x n {^ n v i fnh,G>4vi'Y xsN{y„4g,yt`iJ.J"ve mwx..si.9.,C� {$ +f ry vrx rr rn .,.?f'+v+x5 hx,v x f t 4 rf ry}+SS ArS v{${+}$�•l iC'N `` r t u a. vvr r r`~�++ �' r <br /> LCS # VE051597 VB051597 VB05t597 VBOS1597 V5051597 <br /> Prepared Date: 5/15/97 5/15/97 5/15/97 5/15/97 5/15/97 <br /> Analyzed Date: 5/15/97 5/15/97 5/15/97 5/15/97 5/15/97 <br /> Instrument I D # MS-F3 MS-F3 MS-F3 MS-F3 MS-F3 <br /> Conc. Spiked. 2500 jig/Kg 2500 N9/Kg 2500 pg/Kg 2500 Ng/Kg 2500pg/K9 <br /> LCS Result 1900 2000 2000 2000 2000 <br /> LCS % Recov 76 80 80 80 80 <br /> i <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 ss a control sample of known,Interferent-free matnx 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 /> eeGrego-r—y— <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure I <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 /> *MS=Matrix Spike,MSD–MS Duplicate, RPD=Relative% Difference <br /> Project Manager 9705525 DLT <2> <br />