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i <br /> �V 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 /> l 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> �IIIIF Analytica <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792 0342 <br /> 4pettler-Ryan, Inc Client Project Ib Tosco#6981, Stockton <br /> 3164 Gold Camp Dr , Ste #240 Matrix Vapor <br /> Rancho Cordova, CA 95670 <br /> Attention Steve Carter QC Sample Group 903-2107 Reported Apr 12 1999 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 6020 EPA 8020 EPA 8020 <br /> Analyst J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD <br /> Batch# 10ONG BTEX 100NG BTEX 10ONG BTEX 10ONG BTEX <br /> Date Prepared 3/19/99 3/19/99 3/19/99 3/19/99 <br /> Date Analyzed 3/19/99 3/19/99 3/19/99 3/19/99 <br /> Instrument I D # HP-2 HP-2 HP 2 HP-2 <br /> Conc Spiked 20pg/L 2Gj1g/L 20pg/L 60ug/L <br /> Matrix Spike <br /> % Recovery 105 95 95 103 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 100 95 95 103 <br /> Relative % <br /> Difference 4 9 00 00 0 0 <br /> LCS Batch# 2LCS032399 2LCS032399 2LCS032399 2LCS032399 <br /> Date Prepared 3/23/99 3/23/99 3/23/99 3/23/99 <br /> Date Analyzed 3/23/99 3/23/99 3/23/99 3/23/99 <br /> Instrument I D # HP-2 HP 2 HP-2 HP-2 <br /> LCS % <br /> Recovery 85 85 95 98 <br /> ° Recovery <br /> Control Limits 70130 70 130 70-130 70-130 <br /> Please Note <br /> The LCS is a control sample of known,interterent fxee matrix that is anat'yxed s,,sng tfie. m&seVeJs, <br /> SEQUOIA ANALYTICAL, #1271 preparation,and analytical methods employed for the samptes The malsix spike ss 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 centrol limits slue 10 matrix <br /> Julianne Fegley interference,the LCS recovery is to be used to validate the batch <br /> Project Manager <br /> 9032107 GGG <2> <br />