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Sequoia 1455 McDowePetBlvd <br /> lumoCA 94954 <br /> A (707' 792-0365 <br /> Analytical <br /> FAX(707) 792-0342 <br /> Sequoia San Carlos Protect Subbed in Sampled 4/22/99 <br /> 1551 Industial Blvd Project Number L904337 Received 4/28/99 <br /> San Carlos,CA 94070 Project Manager Mike Gregory Re orted 5/6199 <br /> Volatile Organic Compounds by EPA Method 8260B/Quality Control <br /> Sequoia Analytical-Petaluma <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> IAnalyte Analyzed Level Result Result Units Recov Limits % Lima % Notes* <br /> Batch 9050079 Date Prepared 5/4/99_ Extraction Method EPA 5030 waters <br /> Blank 9050079-BLKI <br /> Tert-amyl methyl ether 5/4/99 ND ug/l 100 <br /> Tert-butyl alcohol 1. ND 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 100 <br /> Methyl tert-butyl ether ND _0 500 <br /> Surrogate Dabromofluoromethane 500 487 860-118 974 <br /> Surrogate 1,2-Dichloroethane-d4 500 511 to 800-120 102 <br /> Surrogate Toluene-d8 500 481 880-110 962 <br /> Surrogate 4-Bromofluorobenzene Soo 503 860-115 101 <br /> nk 9050079-BLK2 <br /> -amyl methyl ether 5/5/99 ND ug/l 1 00 <br /> Tert-butyl alcohol " ND 200 <br /> Di-isopropyl ether " ND 100 <br /> 1,2-DEbromoethane(EDB) ND 0 500 <br /> 1,2-Dcchloroethane ND 0 500 <br /> Ethanol ND 100 <br /> Ethyl tert-butyl ether ND 100 <br /> Methyl tert-butyl ether _ _ ND 0 500 <br /> Surrogate Dabromofluoromethane 500 470 11860-118 940 T r� <br /> Surrogate 1,2-Dachloroethane-d4 to 500 505 If 800-120 101 <br /> Surrogate Toluene-d8 to 500 464 11 880-110 928 <br /> Surrogate 4-Bromofluorobenzene 11 500 487 to 860-115 974 <br /> LCS 9050079-BSI <br /> Methyl tert-butyl ether 5/4/99 500 5 17 ug/l 727-119 103 <br /> Surrogate Dabromofluoromethane to 500 499 11 860-118 998 <br /> Surrogate 1 2-Dichloroethane-d4 500 537 800-120 107 <br /> Surrogate Toluene-d8 500 483 11 880-110 966 <br /> Surrogate 4-Bromofluorobenzene " 500 481 to860-115 962 <br /> LCS 9050079-BS2 _ <br /> Methyl tert-butyl ether ___ _ 5/5/99 500 542 ug/l _ 727-119 108 <br /> Surrogate Drbromofluoromethane 500 508 860-118_ 102 <br /> Surrogate 12-Dachloroethane-d4 500 551 10800-120 110 <br /> Surrogate Toluene-d8 to 500 4 76 to 880-110 952 <br /> Surrogate 4-Bromofluorobenzene 115 00 487 11 860-115 974 <br /> uoia Analytical-Petaluma *Refer to end of report for text of notes and definitions <br /> Page 4 of 6 <br />