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North State Environmental Laboratory CA ELAP# 1151 <br /> 90 South Spruce AN enue Suite V • South San Francisco CA 94080 (650) 266-4563 FAX (650) 366-4560 <br /> C E R T I F I C A T E O F A N A L Y S I S <br /> Quality Control/Quality Assurance <br /> Lab Number* 99-1414 <br /> Client Western Geo-Engineers <br /> Project , Sanchez Country Club Blvd <br /> Date Reported: 09/23/99 <br /> Gasoline, BTEX and MTBE by Methods 8015M and 8020 <br /> Reporting Avg MS/MSD <br /> Walyte Method Limit Unit Blank Recovery RPD <br /> Gasoline 8015M 50 ug/L ND 121 2 <br /> Benzene 8020 0 5 ug/L ND 97 2 <br /> Ethylbenzene 8020 0 5 ug/L ND 106 2 <br /> Toluene 8020 0 5 ug/L ND 105 1 <br /> Xylenes 8020 1 . 0 ug/L ND 114 3 <br /> MTBE 8020 0 5 ug/L ND 95 4 <br /> ELAP Afit3 <br /> Oevie <br /> Page 3 of 3 <br /> John A Murphy, Laboratory Director <br />