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' Sequoia680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> N! <br /> 404 %get Lane Walnut Creek CA 94598 (510) 988 9600 FAX(5 10)988 9673 <br /> Analytical &19 Stnker Avenue Scute 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Pacific Environmental Group-Sac Project Chevron 1001621,Banta,CA Sampled 5/28/98 <br /> 11315 Sunrise Gold Circle St.M Project Number 920 002 2D Received 7/27198 <br /> Rancho Cordova,CA 95742 Project Manager Chris Brown Reported 7/28/98 <br /> ' MTBE by DHS LUFT/QuaLty Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> fnalyte Analyzed Level Result Result Units Recov Limits % Limit % Nates* <br /> .A=ch, 8070346 Date Prep2red,Sjl3/98 Extraction Method, Egg,5030B(PIT) <br /> Efflank $070346-BLK1 <br /> Methyl tert-butyl ether 613/98 ND ug/l Soo <br /> Surrogate a a a-Trifluorotoluene IP 100 101 600-140 101 <br /> 8070346-BS1 <br /> pneyl tert-butyl ether 613/98 100 112 ug/I 700-130 112 <br /> Surrogate a,a,a-Trifluorotoluene 11100 105 600-140 105 <br /> LalS e 892439,xMSI 5805321-06 <br /> Methyl tert-butyl ether 6/3198 100 ND 128 ug/1 600-140 128 <br /> arrogate aaa-Trtuorotoluene 11100 101 600-140 101 <br /> 8070346—MSD] S805321-06 <br /> Methyl tert-butyl ether 613198 100 ND 122 ug/1 600-140 122 25 0 480 <br /> gate a,a,a-Trtfluorotoluene 100 941 600-140 941 <br /> IIIIII <br /> Batch, 8070349 Date Prepared, 614/98 FytractionMethod. EPA 5030B(PIT <br /> $070349-BLKI <br /> ethyl tcrt-butyl ether 6/4198 _ ND ugA 5 00 <br /> arrogate a,a,a-Trtfluorotoluene OP100 108 600-140 108 <br /> 8070349-BSI <br /> _._...,., <br /> et_yl tent-butyl ether _ 614198 100 11 3 ug/l 700-130 113 <br /> Surrogate a a,a-Triuorotoluene 11100 110 600-140 110 <br /> atnx Spike 8070349-MSI 5805350-04 <br /> ethyl tert-butyl ether 6/4/98 100 ND 13 7 ug/l 600-140 137 <br /> Surrogate a a a-Tr fluorwoluene 100 108 600-140 108 <br /> t21]3X Spike Dup 8070349-MSD1S805354-Q4 <br /> Methyl Cert-butyl ether 6/4/98 100 ND 11 8 ugA 600-140 118 25 0 149 <br /> �urrogate a a a-Trifluorotoluene 100 9 71 600-140 971 <br /> clUoia Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> Inda C Schneider,Laboratory Director Page 3 of 4 <br />