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i <br /> Sherwood <br /> 1 Labs 8071 NORTHLANDER AVENUE <br /> C O R P O R A T I O N P O BOX 937 <br /> HILMAR CALIFORNIA 95324 <br /> 02/26/01 QUALITY CONTROL REPORT DHS Cert. #1400 <br /> Total Petroleum Hydrocarbons(TPH) Analysis <br /> Client- GEOLOGICAL TECHNICS, INC Date Received. 02/19/01 <br /> 2741 RIVER RD Date Started- 02/20/01 <br /> MODESTO, CA 95351 Date Complete: 02/26/01 <br /> ATTN: RAY KABLANOW <br /> Lab Report #: H1021902 Lab Sample #:PH102051.8-PH1020521 <br /> 1 Ia,nearity Cbeak <br /> BTEX Benzene 0.9992 TPH Gasoline 0.9992 <br /> Toluene 0.9992 TPH Diesel N/A <br /> 1 Ethyl Benz 0.9994 Motor Oil N/A <br /> Xylenes 1.0000 TRPH (418 1) N/A <br /> ' MTBE N/A <br /> Std % Repeatability MTBE Benzene Toluene Eth Benz Xylenes <br /> BTEX N/A 102 100 96 105 <br /> TPH Gasoline 108 TPH Diesel N/A <br /> TRPH (418.1) N/A Motor Oil N/A <br /> matrix Spike Recoveries MS MSD RPD <br /> MTBE N/A N/A N/A, <br /> ' BTEX Benzene 95 87 9 <br /> Toluene 97 91 6 <br /> Ethyl Benz 93 85 9 <br /> 1Xylenes 101 94 7 <br /> TPH Gasoline 11.5 109 5 <br /> TPH Diesel N/A N/A N/A <br /> method Blank MTBE Benzene Toluene Eth Benz xylenes <br /> y eves <br /> BTEX N/A <.3 ug/L <.3 ug/L <.3 ug/L <.3 ug/L <br /> ' TPH Gasoline <50 ug/L Diesel/MO N/A TRPH(418 1) N/A <br /> ' Lab Control Sample % Recovery EPA Performance Acceptance Range <br /> BTEX Benzene 100 73 1 124 <br /> Toluene 97 73 6 - 120 <br /> Ethyl Benz 106 72 5 = 118 <br /> Xylenes 112 72 7 121 <br /> TPH Gasoline 114 82.4 - 117 <br /> 1TPH Diesel N/A 76 5 - 136 <br /> TRPH (418.1) N/A N/A <br /> Nancy Biddenweg, Lab Tractor�f <br /> OFFICE (209)667-5258 FAX (209)667-2581 <br />