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Sequoia 1455 McDowell Blvd North Ste D <br /> Petaluma CA 94954 <br /> (707) 792-0865 <br /> Analytical <br /> FAX(707) 792-0342 <br /> ATC Associates,Inc Project Ripon USD Sampled 7/15/99 <br /> 1117 Lone Palm Ave,Suite B Project Number 13099 0001 Received 7/20/99 <br />' Modesto,CA 95351 Project Manager Drew Van Allen Reported 8/6/99 <br /> Volatile Organic Compounds by EPA Method 826013/Quality Control <br /> Sequoia Analytical-Petaluma <br /> Date Spike Sample QC Reporting Ltttnt Recov RPD RPD <br /> lAnalyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br />' Batch 9070490 Date Prepared 7/23/99 Extraction Method EPA 5035 <br /> Blank 9070490-BLKI <br /> Tert-amyl methyl ether 7/23/99 ND ug/kg 500 <br /> Tert-butyl alcohol ND 100 <br /> Di-isopropyl ether ND 500 <br /> 1,2-Dtbromoethane(EDB) ND 500 <br /> 1,2-D,chloroethane ND 500 <br /> Ethanol " ND " 200 <br /> Ethyl tert-butyl ether ND 500 <br /> Methyl tert-butyl ether ND 500 <br />' Surrogate Dibromofluoromethane " 500 431 N 800-120 862 <br /> Surrogate 1,2-Dichloroethane-d4 " 500 419 800-120 83 8 <br /> Surrogate Toluene-d8 If <br /> 500 471 810-117 942 <br /> Surrogate 4-Bromofluorobenzene of 500 445 If740-121 890 <br /> 0— 9070490-BSI <br /> Methyl tert-butyl ether 7/23/99 Soo 434 ug/kg 758-124 868 <br /> Surrogate Dibromofluoromethane 500 448 If <br /> 800-120 896 <br />' Surrogate 12-Dichloroethane-d4 500 413 " 800-120 82 6 <br /> Surrogate Toluene-d8 500 463 810-117 92 6 <br /> Surrogate 4-Bromofluorobenzene 500 447 740-121 894 <br /> Matnx Spike 9070490-MSI P907408-01 <br /> Methyl tert-butyl ether 7/23/99 500 ND 411 ug/kg 758-124 822 <br /> Surrogate DtbromofluoromeMane 11500 423 10800-120 84 6 <br />' Surrogate 1,2-Dichloroethane-d4 'I 500 397 11800-120 794 1 <br /> Surrogate Toluene-d8 500 432 810-117 864 <br /> Surrogate 4-Bromofluorobenzene 500 423 " 740-121 84 6 <br />' Matrix Spike Dup 9070490-MSDI P907408-01 <br /> Methyl tert-butyl ether 7/23/99 500 ND 424 ug/kg 758-124 848 35 0 311 <br /> Surrogate Dibromofluoromethane " 500 460 11800-120 920 <br /> Surrogate 12-Dichloroethane-d4 500 424 800-120 848 <br /> Surrogate Toluene-d8 500 489 81 0-117 978 <br /> Surrogate 4-Bromofluorobenzene 500 45 7 740-121 914 <br />' Sequoia Analytical-Petaluma *Refer to end of report for text of notes and definitions <br /> page 8 of 9 <br />