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Sherwood <br /> ' Labs 8071 NORTH LANDER AVENUE <br /> C O R P 0 R A T I 0 N P O BOX 937 <br /> ' HILMAR,CALIFORNIA 95324 <br /> 04/09/01 QUALITY CONTROL REPORT DHS Cert #1400 <br /> Total Petroleum Hydrocarbons(TPH) Analysis <br /> Client* GEOLOGICAL TECHNICS, INC. Date Received: 04/02/01 <br /> 2741 RIVER RD. Date Started: 04/03/01. <br /> MODESTO, CA 95351 Date Complete: 04/04/01 <br /> tATTN: RAY KABLANOW <br /> Lab Report #: H1040205 Lab Sample #,PH1040024-PH1040028 <br /> Linearity Check <br /> ' BTEX Benzene 0.9998 TPH Gasoline 0 9992 <br /> Toluene 0.9996 TPH Diesel 0.9999 <br /> ' Ethyl Benz 0.9994 Motor Oil 0.9998 <br /> Xylenes 0.9992 TRPH (418.1) N/A <br /> MTBE 0_9999 <br /> ' std % Repeatability , MTBE Benzene Toluene Eth Benz Xylenes <br /> BTEX 93 108 101 99 100 <br /> ' TPH Gasoline 102 TPH Diesel 105 <br /> TRPH (418 1) N/A Motor Oil 108 <br /> ' Matrix spike Recoveries MS MSD RPD <br /> MTBE 85 91 7 <br /> BTEX Benzene 90 100 11 <br /> ' Toluene 91 98 9 <br /> Ethyl Benz 93 102 9 <br /> Xylenes 95 103 8 <br /> TPH Gasoline 108 108 0 <br /> TPH Diesel 96 108 12 <br /> ' Method Blank I MTBE Benzene Toluene Eth Benz Xylenes <br /> BTEX <2ug/L <.3 ug/L <.3 ug/L <.3 ug/L <.3 ug/L <br /> TPH Gasoline <50 ug/L Diesel/MO <50 ug/L TRPH(418.1) N/A <br /> l.ab Control sample % Recavery EPA Performance Acceptance Range <br /> BTEX Benzene 92 73.1 - 124 <br /> Toluene 91 73 6 - 1.20 <br /> Ethyl Benz 100 72 5 - 118 <br /> ' Xylenes 106 72 7Y 121 <br /> TPH Gasolirxe 91 82 4 IL17 <br /> - <br /> TPH Diesel 96 76.0 124 <br /> ' TRPH (418 1) N/A N/A <br /> � d <br /> ancy B edenweg, L X09)667-5258 FAX (209)667-2581 <br />