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Sherwood <br /> �r Labs 8071 NORTH LANDER AVENUE <br /> C, O R P O R A T 1 0 N P.O. BOX 937 <br /> HILMAR, CALIFORNIA 95324 <br /> 04/24/01 QUALITY CONTROL REPORT DHS Cert. #1400 <br /> Total Petroleum Hydrocarbons(TPH) Analysis <br /> Client: FOOTHILL ENGINEERING Date Received: 04/13/01 <br /> 12793 PADDY CREEK Date Started: 04/18/01 <br /> LODI, CA 95240 Date Complete: 04/23/01 <br /> ATTN: ERV RIFENBURG <br /> Lab Report #: H1041306 Lab Sample #:PH1040771-PH1040779 <br /> Linearity Cheak: <br /> BTEX Benzene 0.9994 TPH Gasoline 0.9999 <br /> Toluene 0.9993 TPH Diesel N/A <br /> Ethyl Benz 0.9953 Motor Oil N/A <br /> Xylenes 0.9988 TRPH (418.1) N/A <br /> MTBE N/A <br /> Std % Repeatability MTBE Benzene Toluene Eth Benz Xylenes <br /> BTEX N/A 90 93 92 102 <br /> TPH Gasoline 96 TPH Diesel N/A <br /> • TRPH (418.1) N/A Motor Oat N/A <br /> Matrix Spike Recoveries MS MSD RPD <br /> MTBE N/A N/A N/A <br /> BTEX Benzene 98 98 0 <br /> Toluene 99 101 2 <br /> Ethyl Benz 98 103 5 <br /> Xylenes 99 99 0 <br /> TPH Gasoline 120 99 19 <br /> TPH Diesel N/A N/A N/A <br /> Method Blank MTBE Benzene Toluene Eth Benz Xylenes <br /> BTEX N/A <3 ug/Kg <3 ug/Kg <3 ug/Kg <3 ug/Kg <br /> TPH Gasoline <1 mg/Kg Diesel/MO N/A TRPH(418.1) N/A <br /> Lab control sample % Recovery EPA Performance Accepbance Range <br /> BTEX Benzene 83 73.1 - 124 <br /> Toluene 92 73.6 - 120 <br /> Ethyl. Benz 96 72.5 - 118 <br /> Xylenes 113 72.7 - 121 <br /> TPH Gasoline 110 82.4 - 117 <br /> TPH Diesel N/A N/A - N/A <br /> TRPH (418.1) N/A N/A <br /> - q4Yy B edenweg, Lab rest rf <br /> OFFICE: (209)667-5258 FAX: (209)667-2581 <br />