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680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364 9233 <br /> Sequoia <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510)988-9600 FAX(5tO)988 9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> ,!D- Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <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# 98041392 -01-10 Reported May 8, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# SP0424988020EXA SP0424988020EXA SP0424988020EXA SP0424988020EXA SP0424988020EXA <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst K Nill K Nil] K Nill K N11I K Nill <br /> M S/MSD # 8041135 8041135 8041135 8041135 8041135 <br /> Sample Conc ND N D No N D N D <br /> Prepared Date 4/24/98 4/24/98 4/24/98 4/24/98 4/24/98 <br /> Analyzed Date 4/24/98 4/24/98 4/24/98 4/24/98 4/24/98 <br /> Instrument 1 D.# HP4 HP4 HP4 HP4 HP4 <br /> Conic Spiked 0 80 mg/Kg 0 80 mg/Kg 0 80 mg/Kg 2 4 mg/Kg 6 5 mg/Kg <br /> Result 084 085 078 24 11 <br /> MS % Recovery 105 106 98 100 167 <br /> Dup Result 081 082 078 24 11 <br /> MSD % Recov 101 103 98 100 167 <br /> RPD. 36 36 00 00 00 <br /> RPD Limit- 0-20 0-20 0-20 0-20 0-50 <br /> LCS # LCSO42998 LCSO42998 LCSO42998 LCSO42998 LCSO42998 <br /> Prepared Date 4/29/98 4/29/98 4/29/98 4/29/98 4/29/98 <br /> Analyzed Date 4/29/98 4/29/98 4/29/98 4/29/98 4/29/98 <br /> Instrument I D # HP4 HP4 HP4 HP4 HP4 <br /> Conic Spiked 0 40 mg/Kg 0 40 mg/Kg 0 40 mg/Kg 1 2 mg/Kg 6 6 mg/Kg <br /> LCS Result 038 038 036 11 58 <br /> LCS % Recov 95 95 90 93 88 <br /> 60-140 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> Zlap# preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified withknown 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 /> ry <br /> Project Manager **MS=Matrix Spike,MSD MS Duplicate, RPD=Relative% Difference 9804892 GET <1 n <br />