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r404 N WlgetLane <br /> q <br />' Seuoia Walnut Creek CA 94598 <br /> 1 (925)988-%W <br /> FAX(9Z5)988-9673 <br /> Analytical www sequoialabs corn <br /> ov F Weston-Vallelo Project San Joaquin HSA <br /> P O Boy 2135 Project Number San]oaqum HSA Reported <br /> Vallelo CA, 94592 Prosect Manager Scott Lookingbill 24-Aug-00 15 10 <br /> MTBE by EPA Method 8260A - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reportmg Spike Source %REC RPD <br /> nalyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch OH15006-EPA 5030B [PIT] <br /> Wank(OH15006-BLKI) Prepared&Analyzed 15-AuQ-00 <br /> tthyl tert butyl ether ND 20 ugyl <br /> Surrogate Drbromofluoromethane 500 500 100 50-150 <br /> 9 lank (OH15006-BLK2) Prepared&Analyzed 16-Aug-00 <br /> Methyl tert-butyl ether ND 20 ugll <br /> arrogate Dibrornofluorornethane 500 500 100 50-150 <br /> CS(OH15006-BSI) Prepared&Analyzed 15-Aug-00 <br /> Methvi tort-butyl ether 35 5 2 0 ugrl 500 71 0 70-130 <br /> urrobate Dibrornofluorornethane 490 500 98 0 50-150 <br /> CS(OH15006-BS2) Prepared&Analyzed 16-Au`Q-00 <br /> NWLyl tert-butyl ether 420 2 0 ugll 500 840 70-130 <br /> are Dibromofluoromethane 500 1500 100 50-150 <br /> Matrix Spike(OH15006-MSI) Source W008260-02 Prepared&Analyzed 15-Aug-00 <br /> ethyl tert-butyl ether 420 20 ug/l 500 ND 840 60-150 <br /> urragale Drbroinofluorornethane 470 1500 940 50-150 <br /> Matrix Spike Dup(OH15006-MSD1) Source W008260-02 Prepared&Analyzed 15-Aug-00 <br /> ethyl tert-hutyl ether 446 2 0 ugil 500 ND 892 60-150 600 25 <br /> urr�Dibroinofluoromethane 470 -500 9-10 50-150 <br /> 1 <br /> 1 <br /> 1 <br /> to Analytical- Walnut Creek The re%u11%in this report apply to the samples analyzed in accordance with lire chain 01 <br /> cuslodv document Thr%analytical report muss be reproduced in it%enfirL4 <br />' Page 5 of 6 <br />