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o80 Chesapeake Drive Redwood Cay CA 94063 (415) 364 9600 FAX (415) j64 9233 <br /> ' 404 N Wiget Lane Walnut Creek CA 94598 (5 10) 988 9600 FAX(510) 988 9673 <br /> Analytical 819 Striker Avenue Suite$ Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> Delta Environmental Consultants Client Project ID Unocal #5886 2701 W March Lane, Stockton <br /> I <br /> 3300 Delta Drive Ste 100 Matrix Solid <br /> Rancho Cordova CA 95670 <br /> ' Attention Eric Holm CC Sample Group 5091736-40 Reported Oct 11, 1995 <br /> I <br /> I <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Deese! <br /> Benzene <br /> ' QC Batch# SP100495 SP100495 SP100495 SP100495 SP100295 <br /> 8020EXA 8020EXA 8020EXA 8020EXA 8015EXA <br /> Analy Method EPA 8020 ERA 8020 EPA 8020 EPA 8020 EPA 8015 <br /> ' Prep Method EPA 5030 ERA 5030 EPA 5030 EPA 5030 EPA 3550 <br /> Analyst M Creusere M Creusere M Creusere M Creusere J Dinsay <br /> MS/MSD # 5100199 5100199 5100199 5100199 5092247 <br /> Sample Conc N 0 N D N D N D 3 0 mg/kg <br /> ' Prepared Date 10/4/95 10/4/95 10/4/95 10/4/95 10/2/95 <br /> Analyzed Date 10/4/95 10/4/95 10/4/95 10/4/95 10/3/95 <br /> Instrument LD # HP 2 hP 2 HP 2 HP 2 GCHP 3A <br /> ' Conc Spiked 0 40 mg/kg 0 40 mg/kg 0 40 mg/kg 1 2 mg/kg 10 mg/kg <br /> Result 045 042 044 13 13 <br /> MS % Recovery 113 105 110 109 100 <br /> ' Dup Result 045 043 044 13 12 <br /> MSD % Recov 113 113 110 110 90 <br /> RPO 00 24 00 076 80 <br /> RPD Limit 0-20 0-20 0-20 0-20 0-20 <br /> LCS 1LCS100495 lLCS100495 lLCS100495 lLCS100495 81-K100295 <br /> ' Prepared Date 10/4/95 10/4/95 10/4/95 10/4/95 10/2/95 <br /> Analyzed Date 10/4/95 10/4/95 10/4/95 10/4/95 10/3/95 <br /> Instrument I D ,'#' HP 2 HP-2 HP-2 HP-2 GCrIP-3A <br /> ' Conc Spiked 20 yg/L 20 wg/L 20 ug/L 60!!g/L 10 mg/kg <br /> LCS Result 20 20 21 60 64 <br /> ' LCS % Recov 102 98 104 100 64 <br /> ' LCS <br /> Control Limits 55-145 47 149 47-155 56-140 36 122 <br /> Please Nate <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> SEQUOIA ANALYTICAL. x'1271 preparation and analytical methods employed for*he samples The matrix spike is an alicuot or sample <br /> fortified with known quantities OT speciTic compounds and suoiec•ed to the entire analytical crocedure If <br /> rr f {t the recovery OT analytes tram the matrix spike does riot fall within speciTiec control limits oue to matrix <br /> inTerTerence the LCS recovery is to be used to valiame the batch <br /> Kenneth L Wimer MS=Matrix Spike MSD=-MS Duplicate 4P4=Relative o Dirference <br /> ' Project Manager <br /> 5091706 CCC ->> <br />