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Sequoia 680 Chesapeake Drove Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 H W,get Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 8t9 StnkerAvenue Suite 8 Sacramento CA 95834• (916) 92 00 1 96FAX(916)921 0100 <br /> �1,� <br /> Brown and Caldwell Client Project ID Arco #2093, Tracy h <br /> 3480 Buskirk Avenue Matrix Liquid <br /> Pleasant Hill, CA 94523 <br /> Attention Steve Misner QC Sample Group 7111386-392 Reported Dec 8, 1997 <br /> (QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes MTBE <br /> Benzene <br /> QC Batch# GC112697 GC112697 GC112697 GC112697 MS120197 <br /> 802004A 802004A 802004A 802004A MTBEH6A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8260 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst D Newcomb D Newcomb D Newcomb D Newcomb L Duong <br /> MS/MSD # 7111141 7111141 7111141 7111141 9711A77-05 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 11/26/97 11/26/97 11/26/97 11/26/97 12/1/97 <br /> Analyzed Date 11/26/97 11/26/97 11/26/97 11/26/97 12/1/97 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 H-6 <br /> Conc Spiked 20ug/L 20ug/L 20ug/L 60ug/L 50ug/L <br /> Result 21 22 20 64 52 <br /> MS % Recovery 105 110 100 107 104 <br /> Dup Result 22 22 21 65 55 <br /> MSD % Recov 110 110 105 108 110 <br /> RPD 47 00 49 16 56 <br /> RPD Limit 0-20 0-20 0-20 0-20 0-25 <br /> LCS # 4LCS112697 4LCS112697 4LCS112697 4LCS112697 LCS120197 <br /> Prepared Date 11/26/97 11/26/97 11/26/97 11/26/97 12/1/97 <br /> Analyzed Date 11/26/97 11/26/97 11/26/97 11/26/97 12/1/97 <br /> Instrument 1 D # HP-4 HP-4 HP-4 HP-4 H-6 <br /> Conc Spiked. 20Ng/L 20ug/L 20frg/L 60ug/L 50ug/L <br /> LCS Result 23 23 22 68 49 <br /> LCS % Recov 115 115 110 113 98 <br /> LCS 70-130 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> Please Not <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL, #1271 preparation,and analytical methods employed for the samples The matrix spoke is an aliquot of sample <br /> &#1210 fortified with known quantities of specific compounds and sub)ected 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 recoveryis to be used to validate the batch <br /> Melissa A Brewer '*M =Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference <br /> Client Services Representative <br /> 7111386 BRO <5> <br />