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' 1.455 McDowell Blvd North, Ste D <br /> ►.-x`1--= 1 -0�a Petaluma CA 94954 <br /> (707) 792-165 <br /> Analytical FAX(707) 792-0342 <br /> uoia San Carlos Project Subbed in Sampled 4/8199 <br /> 51 Industial Blvd Project Number L904098 Received 4/12/99 <br /> San Carlos,CA 94070 Project Manager Mike Gregory Reported 4/26/99 <br /> Volatile Organic Compounds by EPA Method 8260B/Quality Control <br /> Sequoia Analytical-Petaluma <br /> Date Spikc Sample QC Reporting Limit Recov RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> LCS 9040415-BSI <br /> Methyl tert-butyl ether 4/17199 500 464 ug/l 727-119 928 _ <br /> Surrogate Dibromofluoromethane 500 483 " 860-118 966 <br /> Surrogate 1,2-Dichloroethane-d4 500 466 " 800-120 932 <br /> Surrogate Toluene-d8 500 497 of 880-110 994 <br /> Surrogate 4-Bromofluorobenzene 500 501 Of 860-115 100 <br /> LCS 9040415-BS2 <br /> M_cthyl tert-butyl ether _ 4/19/99 5 00 468 ugll 727-119 93 6 <br /> Sur-ogzte Dibromofluorcmethane " 500 4 78 to 860-118 956 <br /> Surrogate 1 2-Dichloroethane-d4 500 4 70 It 800-120 940 <br /> Surrogate Toluene-d8 500 4 64 IF 880-110 92 8 <br /> Surrogate 4-Bromofluorobenzene 500 483 if 860-115 966 <br /> LCS 9040415-BS3 <br /> Methyl tert-butyl ether _ 4/20/99 5 00 448 ug/1 72 7-1 19 896 _ <br /> Surrogate Dibromofluoromethane 5 00 488 IF 860-118 976 <br /> Orrogate 12-Dichloroethane-d4 5 00 4 79 800-120 958 <br /> rogate Toluene-d8 500 4 64 880-110 928 <br /> "Surrogate 4-Bromofluorobenzene 500 4 73 860-115 946 <br /> Matrix Spike 9040415-MSI P904440-01 <br /> Methyl tert-butyl ether 4117/99 5 00 ND 469 ug/1 727-119 938 <br /> Surrogate Dibromofluoromethane 1, 5 00 4 92 11 860-118 984 <br /> Surrogate 1,2-Dichloroethane-d4 It 5 00 4 79 800-120 958 <br /> Surrogate Toluene-d8 to 5 00 497 880-110 994 <br /> Surrogate 4-Bromofluorobenzene " 5 00 513 860-115 103 <br /> Matrix Spike Dup 9040415-MSD1 P904440-01 <br /> Methyl tert-butyl ether 4/17/99 5 00 ND 464 ug/l 727-119 928 200 1 07 <br /> Surrogate Dibromofluoromethane of 500 498 " 860-118 99 6 <br /> Surrogate 1,2-Dichloroethane-d4 IF <br /> 5 00 487 of 800-120 974 <br /> Surrogate Toluene-d8 5 00 487 If <br /> 880-110 974 <br /> Surrogate 4-Bromofluorobenzene 5 00 503 it 860-113 101 <br /> Scuoia Analytical-Petaluma *Refer to end of report for text of notes and definitions <br /> Page 4 of 5 <br />