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Sequoia 1455 McDowell Blvd North, Ste D 4 15) Petaluma,CA 94954 (707)792-1865 Analytical FAX(707)792-0342 Cambria Environmental Protect Equiva 10d Sampled I2/15/99 270 Perkins St Project Number 2494 Fremont St,Stockton,Ca Received 12/16/99 Sonoma,CA 95476 Project Manager Bob Perlowski Reported 117100 Volatile Organic Compounds by EPA Method 8260B1Quality Control Sequoia Analytical-Petaluma Date Spike Sample QC Reporting Limit Recov RPD RPD Analyte Analyzed Level Result Result Units Recov Linuts % Lirnit % Notes* Batch 9120699 Date Prepared 12/30/99 Extraction Method EPA 5030 waters Blank 9120699-BLKI Tert-amyl methyl ether 12/30/99 ND ug/l 100 Tert-butyl alcohol ND 200 Di-isopropyl ether ND 100 1,2-Dibromoethane(EDB) ND 0 500 1,2-Dichloroethane ND 0 500 Ethanol ND 100 Ethyl tert-butyl ether ND 100 Methyl tert-butyl ether ND 0 500 Surrogate Dibromofluoromethane 500 453 to 860-118 906 Surrogate 12-Dichloroethane-d4 500 425 800-120 850 Surrogate Toluene-d8 500 479 880-110 958 Ukuk 9120699-BLK2 P,, ylmethyl ether 113/00 ND ugll 1 00 -butyl alcohol ND 200 Di-isopropyl ether ND 1 00 1,2-Dibromoethane(EDB) ND 0 500 1,2-Dichloroethane ND 0 500 Ethanol ND 100 Ethyl tert-butyl ether ND 1 00 Methyl tert-butyl ether ND 0 500 Surrogate Dibromofluoromethane 500 503 860-118 101 Surrogate 12-Dichloroethane-d4 500 523 800-120 105 Surrogate Toluene-d8 500 505 880-110 101 Blank 9120699-BLK3 Tert-amyl methyl ether 114100 ND ug/l 1 00 Tert-butyl alcohol ND 200 Di-isopropyl ether ND 1 00 1,2-Dibromoethane(EDB) ND 0 500 1,2-Dichloroethane ND 0 500 Ethanol ND 100 Ethyl tert-butyl ether ND 100 Methyl tert-butyl ether ND 0 500 Surrogate Dibromolluoroniethane 500 491 860-118 982 Surrogate 1,2-Dichloroethane-0 500 527 800-120 105 Surrogate Toluene-d8 500 500 880-110 100 LCS 9120699-BSI thyl tert-butyl ether 12/30/99 500 473 ug/] 727-119 946 oia Analytical-Petaluma *Refer to end of report for text of notes and definitions Page 14 of 16