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Sherwood <br /> Labs 8071 NORTH LANDER AVENUE <br /> C O R P O R A T I O N PO BOX 937 <br /> HILMAR, CALIFORNIA 95324 <br /> 08/03/01 QUALITY CONTROL REPORT DHS Cert_ #1400 <br /> Total Petroleum Hydrocarbons(TPR) Analysis <br /> ' Client: GEOLOGICAL TECHNICS, INC. Data Reaw ved: 07/27/01 <br /> 2741 RIVER RD. Date Started- 07/30/01 <br /> MODESTO, CA 95351 Date Complete: 08/03/01 <br /> ATTN., MIKE NIEHI <br /> Lab Repor H107300. Lab Sample #-PH1070987-PH1070992 <br /> Linearity Check <br /> BTEX Benzene 0.9986 TPH Gasoline 0.9996 <br /> Toluene 0.9996 TPH Diesel. N/A <br /> Ethyl Benz 0.9993 Motor Oil. N/A <br /> Xylenes 0.9997 TRPH (418.1) N/A <br /> ' MTBE 0.9997 <br /> std % RepeatabilztyMTBE Benzene Toluene Eth Benz Xylenes <br /> ' BTEX 103 105 108 106 114 <br /> TPH Gasoline 99 TPH Diesel N/A <br /> TRPH (418.1) N/A Motor Oil N/A <br /> Matrix Spike Recoveries MS MSD RPD <br /> ' MTBE 117 108 8 <br /> BTEX Benzene 115 107 7 <br /> Toluene 115 1.04 10 <br /> Ethyl Benz 109 104 5 <br /> Xylenes 111 1.08 3 <br /> TPH Gasoline 98 102 4 <br /> ' TPH Diesel N/A N/A N/A <br /> Rethod Blank MTBE Benzene Toluene Eth Benz Xylenes <br /> BTEX <50 ug/Kg <3 ug/Erg <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 Avoeptaaee Range <br /> STEX Benzene 97 73.1 124 <br /> I <br /> Toluene 97 73.6 - 120 <br /> Ethyl Benz 97 72.5 -- 118 <br /> Xylenes 103 72 7 - 121 <br /> TPH Gasolxne 101 82 4 - 117 <br /> TPH Diesel N/A N/A N/A <br /> TRPH (418. ) N/A N/A <br /> Nanny Bxe g, �]Da�-r/'ve�ctr <br /> OFFICE (209)667-5258 FAX (209) 667-2581 <br /> i <br />