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Sequoia � � 819 Striker Avenue.Suite 8 ~ ~� Sequoia Sacramento,CA 95834 AAnalytical. +� (916)921-9600 nalytical. FAX(916)921-0100 EMCON-Cl' Project: ARCO 21 S6,Stockton,CA Sampled: 6/17199 3939 Cambridge Ave Project Number: 21775-231-002 Received: 6/18/99 Cameron Park,CA 95682 Project Mana er: Mark Capps Reported: 7/1/99 Volatile Oxygenate Compounds by EPA Method 8260A Sequoia Analytical -Sacramento Batch Date Date Surrogate Reporting Analyte Number Prepared Analyzed Limits Limit Result Units Notes* SWSW-W f 1 R'1f 1" 59063]9-01 Tert-butyl alcohol 9060309 6/21199 6123199 10.0 ND mg/kg Methyl tert-bury!ether 0.100 11.0 " Di-isopropyl ether " . 0.100 ND " Ethyl tert-butyl ether 0.100 ND " Tert-amyl methyl ether 0.100 ND " Surrogate; 1,2-DC4-d4 60.0190 80"4 SW-F(785 S206319-02 541 Tert-butyl alcohol 9060309 6/21/99 6/23/99 10.0 ND mg/kg Methyl tert-butyl ether t. 0.100 0.447 Di-isopropyl ether 0.100 ND " Ethyl tert-butyl ether 0.100 ND " Tert-amyl methyl ether 0.100 ND " Surrogate: 1,2-DCA-d4 60.0-140 78.8 % �'=�-$-� S906319-03 S4i.l Tert-butyl alcohol 9060309 6121199 6123/99 10.0 ND mg/kg Metbyl cert-butyl ether 0.100 0.221 " Di-isopropyl ether 0.100 ND " Ethyl tent-butyl ether 0.100 ND " Tert-amyl methyl ether " 0.100 ND Surrogate: 1,2-DCA-d4 60.0-140 80.8 % SW-Nf 1 R'1 S906312-04 SAW Ten-butyl alcohol 9060309 6/21/99 6/24199 20.0 ND mg/kg D Methyl tert-butyl ether 0.200 23.8 D Di-isopropyl ether 0.200 ND D Ethyl tert-butyl ether 0.200 ND p Tert-amyl methyl ether 0.200 ND D Surrogate: 1.2-DCA44 60.0-140 89.6 % D 5906319-05 Tert-butyl alcohol 9060309 6/21/99 6/23/99 10.0 ND mg/kg Methyl tert-butyl ether 1. " 0.100 ND " Di-isopropyl ether 0.100 ND " Ethyl tert-butyl ether 0.100 ND Ter-amyl methyl ether 0.100 ND " Sequoia Analytical-Sacramento "Refer to end of report for text of notes and definitions. Page 7 of 14