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' 680 Chesapeake Drive Redwood City CA 94063 <br /> Sequoia (650} 364-9600 FAX(650)364-9233 <br /> 404 N Wlget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-010 0 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 707)792-1865 FAX(707)792 0342 <br />' ATC Associates,Inc Project Ripon USD Sampled 215/99 <br /> 1117 Lone Palm Ave,Suite B Project Number 13099 0001 Received 2/10/99 <br />' Modesto,CA 95351 Project Manager Drew Van Allen Reported 2125/99 <br /> Volatile Organic Compounds by EPA Method 8260E/Quality Control <br /> Sequoia Analytical-Petaluma <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Batch 9020394 Date Prepared .2/17/99 Extraction Method EPA 5030 waters <br /> Blank 9020394-BLK1 <br /> Tert-amyl methyl ether 2117199 ND ug/1 1 00 <br />' Tert-butyl alcohol ND 200 <br /> Di-isopropyl ether " ND " 100 <br /> 1,2-Dibromoethane(EDB) ND 0 500 <br /> l,2-Diehl oroethane ND 0 500 <br /> Ethanol ND 100 <br /> Ethyl tert-butyl ether ND 100 <br /> Methyl tert-butyl ether ND 100 <br /> Surrogate Dibromofluoromethane 5 00 510 860-118 102 <br />' Surrogate 1,2-Dichloroethane-d4 I' 5 00 520 800-120 104 <br /> Surrogate Toluene-d8 500 504 880-110 101 <br /> Surrogate 4-Bromofluorobenzene 5 00 529 860-11-5 106 <br /> 10 <br /> nk 9020394-BLK2 <br /> Tert-amyl methyl ether 2/18/99 ND ug/l 100 <br /> Tert-butyl alcohol ND 20 0 <br /> Di-isopropyl ether ND " 1 00 <br /> 1,2-Dibromoethane(EDB) ND 0 500 <br /> 1,2-Dichloroethane ND 0 500 <br /> ' Ethanol ND 100 <br /> Ethyl tert-butyl ether ND " 100 <br /> Methyl tert-butyl ether ND 100 <br /> Surrogate Dibromofluoromethane 500 542 860-118 108 <br /> ' Surrogate 1 2-Dichloroethane-d4 I, 500 525 800-120 105 <br /> Surrogate Toluene-d8 5 00 536 " 880-110 107 <br /> Surrogate 4-Bromofluorobenzene 500 567 860-115 113 <br /> ' Blank 9020394-BLK3 <br /> Tert-amyl methyl ether 2119/99 ND ug/l 1 00 <br /> Tert-butyl alcohol ND 1. 200 <br /> ' Di-isopropyl ether ND 100 <br /> 1,2-Dibromoethane(EDB) ND „ 0 500 <br /> 1,2-Dichloroethane ND 0 500 <br /> Ethanol ND 100 <br /> Ethyl tert-butyl ether " ND l 00 <br /> Methyl tert-butyl ether ND 1 00 <br /> Surrogate Dibromofluoromethane 500 511 860-118 102 <br /> Surrogate 12-Dichloroethane-d4 5 00 489 ,I 800-120 978 <br /> Surrogate Toluene-d8 5 00 489 880-110 978 <br /> ogate 4-Bromofluorobenzene 5 00 513 860-115 103 <br /> ' Sequoia Analytical - Petaluma *Refer to end of report for text of notes and definitions <br /> Page 7 of 9 <br /> t <br />