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1455 McDowell Blvd North,Ste D <br /> Sequoia Petaluma,CA 94954 <br /> �. (707)792 I865 <br /> FAX(707)792 0342 <br /> Analytical wwwsequofalabs com <br /> Gettler-Ryan-Dublin Project Tosca <br /> 6747 Sierra Ct,Suite J Project Number 2701 W March Lane,Stockton Ca Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 02/15/01 10 28 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical- Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1010516-EPA 5030 waters <br /> Blank(1010516-BLK4) Prepared&Analyzed 01/31/01 <br /> Surrogate Toluene-d8 492 49/1 500 984 84-115 <br /> LCS(1010516-BS1) Prepared&Analyzed 01/23/01 <br /> Methyl cert-butyl ether 496 0 500 ug/I 500 992 79-118 <br /> Surrogate Dtbromofluoromethane 501 500 100 88-118 <br /> Surrogate 12-Dichloroethane-d4 492 500 984 81-130 <br /> Surrogate Toluene-d8 518 500 104 84-115 <br /> LCS(1010516-BS3) Prepared&Analyzed 01/30/O1 <br /> Methyl tert-butyl ether 504 0 500 ug/l 500 101 79-118 <br /> Surrogate Dibromofluoromethane 506 500 101 88-118 <br /> 10gale 1 2-Dichloroethane-d4 5 15 500 103 81-130 <br /> gate Toluene-d8 500 500 100 84-115 <br /> LCS(1010516-BS4) Prepared&Analyzed 01/31/01 <br /> Methyl tert-butyl ether 509 0 500 ug/I 500 102 79-118 <br /> Surrogate Dibromofluoromethane 500 500 100 88-118 <br /> Surrogate 12-Dichloroethane-d4 520 500 104 81-130 <br /> Surrogate Toluene-d8 500 500 100 84-115 <br /> Matrix Spike(1010516-MS1) Source P101477-01 Prepared&Analyzed 01/23/01 <br /> Methyl Cert-butyl ether 482 500 ug/l 500 ND 964 79-118 <br /> Surrogate Dibromofluoromethane 500 500 100 88-118 <br /> Surrogate 12-Dichloroethane-d4 511 500 102 81-130 <br /> Surrogate Toluene-d8 5 17 Soo 103 84-115 <br /> Matrix Spike Dup(1010516-MSDI) Source P101477-01 Prepared 01/23/01 Analyzed 01/24/01 <br /> Methyl tert-butyl ether 477 500 ug/I 500 ND 954 79-118 104 20 <br /> Surrogate Dibromofluoromethane 503 500 101 88-118 <br /> Surrogate 1 2-Dichloroethane-d4 507 500 101 81-130 <br /> Surrogate 2"oluene-d8 502 " 500 100 84-115 <br /> uoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 15 of 19 <br />