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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 11&V Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 fAx(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 1551 Industrial Road San Carlos,CA 94070-4111 (650)232-9600 FAX(650)232-9612 <br /> Blaine Tech Services Client Project ID Chevron 9-2033/990217-P1 <br /> 1680 Rogers Avenue <br /> San Jose, CA 95112 <br /> Attention Christine Lillie QC Sample Group 9902842-01 Reported Mar 5, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8010/8020 6011602 <br /> Analyst C Hankermeyer <br /> ANALYTE 1,1-DCE TCE Chlorobenzene Benzene Toluene Chlorobenzene <br /> QC Batch # GCO227990VOA298 <br /> Sample No 9902957-33 <br /> Date Prepared 2127199 2127199 2127199 2127199 2127199 2127199 <br /> Date Analyzed 2127199 2127199 2127199 2127199 2127199 2/27199 <br /> Instrument I D # GCHP29 GCHP29 GCHP29 GCHP29 GCHP29 GCHP29 <br /> Sample Conc , ug/L N D 12 N D N D N D N D <br /> Conc Spiked ug/L 50 50 50 50 50 50 <br /> Matrix Spike, ug/L 54 60 47 58 57 58 <br /> Recovery 108 96 94 116 114 116 <br /> Matrix <br /> Spike Duplicate ug/L 57 63 4$ 61 60 62 <br /> % Recovery 114 102 96 122 120 124 <br /> Relative % Difference 5 4 6 1 2 1 5 0 5 1 6 7 <br /> RPD Control Limits 0-50 0-50 0-50 0-50 0-50 0-50 <br /> LCS Batch# VWLCS022799A <br /> Date Prepared 2127199 2127199 2127199 2127199 2127199 2127199 <br /> Date Analyzed 2127199 2127199 2127199 2127199 2127199 2127/99 <br /> Instrument I D # GCHP29 GCHP29 GCHP29 GCHP29 GCHP29 GCHP29 <br /> Cont Spiked ug/L 25 25 25 25 25 25 <br /> Recovery, ug/L 26 25 24 30 29 30 <br /> LCS % Recovery 104 100 96 120 116 120 <br /> Percent Recovery Control Limits <br /> N151fV1SD �13 <br /> �614 60140 60 140 60140 60140 <br /> LCS 7D 130 70 130 70 130 70 130 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> Please Note <br /> The LCS s a control sample of known interferent free matrix that is analyzed using the same reagents <br /> 6SE 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 /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> t interference the LCS recovery is to be used to validate the batch <br /> Mei Mel Shin <br /> Project Manag <br />