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Sequoia 660 Chesapeake Drive Redwood City ( 0) 364 9600 FAX(550)364 9233 <br /> 404 N Wiget Lane Walnut Creek CAA 945484598 (51510) 988 9600 FAX(510)986 9673 <br /> �I,�► Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 911 9600 FAX(9 16)921 0100 <br /> Settler-Ryan Client Project ID UNOCAL#5421-8tockton <br /> 6747 Sierra Court, Suite J Matrix Solid <br /> Dublin, CA 94568 <br /> Attention Clyde Galantine QC Sample Group 8041420 Reported May 6, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Acenaphthene 4-Nitrophenol 2,4-❑initro- Pentachloro Pyrene <br /> toluene phenol <br /> QC Batch# SP042898 SP042898 SP042898 SP042898 SP042898 <br /> 8270EXA 8270EXA 8270EXA 8270EXA 8270EXA <br /> Analy Method EPA 8270 EPA 8270 EPA 8270 EPA 8270 EPA 8270 <br /> Prep Method EPA 3550 EPA 3550 EPA 3550 EPA 3550 EPA 3550 <br /> Analyst L Diaz L Diaz L Diaz L Diaz L Diaz <br /> MS/MSD # 8041711 8041711 8041711 8041711 8041711 <br /> Sample Cone N D N D N D N D N D <br /> Prepared Date 4/28/98 4/28/98 4/28/98 4/28/98 4/28/98 <br /> Analyzed Date 4/28/98 4/28/98 4/28/98 4/28/98 4/28/98 <br /> Instrument I D # GC/MS 1 GC/M5-1 GC/MS 1 GC/MS-1 GC/MS-1 <br /> Cone Spiked 3300 ug/kg 5000ug/kg 3300 pg/kg 5000 pg/kg 3300pg/kg <br /> Result 2500 2100 2000 2800 4300 <br /> MS % Recovery 76 42 61 56 67 <br /> Dup Result 2100 2200 1500 2200 3600 <br /> MSD % Recov 64 44 45 44 45 <br /> RPD 17 47 29 24 18 <br /> RPD Limit 0-40 0-40 0-40 0-40 0-40 <br /> LCS. # BLK042898 BLK042898 BLK042898 BLK042898 BLK042898 <br /> Prepared Date 4/28/98 4/28/98 4/28/98 4/28/98 4/28/98 <br /> Analyzed Date 4/28/98 4/28/98 4/28/98 4/28/98 4/28/98 <br /> Instrument I D # GC/MS-1 GC/MS 1 GC/MS-1 GC/MS-1 GC/MS-1 <br /> Cone Spiked 3300 pg/kg 5000 pg/kg 3300 pg/kg 5000 pg/kg 3300 pg/kg <br /> LCS Result 2500 3700 2400 4100 3000 <br /> LCS % Recov 76 74 73 82 91 <br /> LCS 31-137 11 114 28-89 17-109 35-142 <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 /> preparation,and analytical methods employed for 1he samples The matrix spike is an aliquot of sample <br /> SGil— <br /> IA ANALYTICAL, #1271 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 recover isto be used to validate the batch <br /> MS=Matrix Spoke MSD=MS Duplicate, RPD=Relative% Difference <br /> A // <br /> Labo?ey <br /> or rector Page 2 of 2 <br /> 8041418 GET <13> <br />