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Sequoia 680 Chesapeake Dnvc Redwood City CA 94063 (415) 364-9600 FAX (415) 364 9233 <br /> 1q) 404 N Wiget Lane Walnut Creek CA 94598 (510) 988-9600 FAX (510)988 9,573 <br /> WQW Analytiea1 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Delta Environmental Consultants Client Project ID Exxon 7-3708, D093-809 <br /> 3164 Gold Camp Dnve, #200 Matrix Liquid <br /> Rancho Cordova, CA 95670 <br /> Attention Keoni Aimeida Work Order # 9706172-04, 05, 08 Reported Jun 14, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch#' GC061097STEX01A GC0610978TEX01A GCO61097STEC01A GC061097BTEX0IA GCO61097STEC01A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep. Method: EPA 5030 EPA 5030 EPA 6030 EPA 5030 EPA 5030 <br /> Analyst A.Porter A.Porter A. Porter A.Porter A.Porter <br /> MS/MSD #- 9706279-08 9706279-08 9706279-08 9706279-08 9706279-08 <br /> Sample Conc. N1 N D N N D N D <br /> Prepared Date. 6/10/97 6/10/97 6/10/97 6/10/97 6/10/97 <br /> Analyzed Date: 6/10/97 6/10/97 6/10/97 6/10/97 6/10/97 <br /> Instrument I D #, GCHP-01 GCHP-01 GCHP-01 GCHP-01 GCHP-01 <br /> Conc. Spiked 10 pg/L 10 pg/L 10 pg/L 30 pg/L 60 pg/L <br /> Result: 11 10 10 30 74 <br /> MS % Recovery 110 100 100 100 123 <br /> Dup. Result: 11 10 10 30 74 <br /> MSD % Recov 110 100 100 100 123 <br /> RPD 00 00 00 00 00 <br /> RPD Umrt. 0-25 0-25 0-25 0-25 0-25 <br /> ,- <br /> r.,,,, <br /> LCS # BLK061097 BLK061097 BLK061097 BLK061097 BLK061097 <br /> Prepared Date 6/10/97 6/10/97 6/10/97 6/10/97 5/10/97 <br /> Analyzed Date. 6/10/97 6/10/97 6/10/97 6/10/97 6/10/97 <br /> Instrument LD #- GCHP-01 GCHP-01 GCHP-01 GCHP-01 GCHP-01 <br /> Conc Spiked 10 pg/L 10 pg/L 10 pg/L 30 pg/L 6opg/L <br /> LCS Result- 11 10 10 30 75 <br /> LCS % Recov 110 100 100 100 125 <br /> 60-140 60-140 60-140 &0-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> i he LCS is a control sample of known,interferent-free matrix 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 /> / 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 fail within specified control limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> Gregory <br /> roject Manager MS=Matrix Spike MSD=MS Duplicate, RPD=Relative o Drfference 9706172 DLT <2> <br />