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Sherwood <br /> Labs 8071 NORTH LANDER AVENUE <br /> . CORPORA TION 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 #: H1021901 Lab Sample #!PH1020515-PH1020517 <br /> ' Linearxty Check <br /> BTEX Benzene 0.9992 TPH Gasoline 0 9995 <br /> Toluene 0 9992 TPH Diesel 0 9997 <br /> Ethyl Benz 0.9994 Motor Oil 0.9999 <br /> Xylenes 1 0000 TRPH (41.8 1) N/A <br /> ' MTBE 0 9998 <br /> Std % Repeatability MTBE Benzene Toluene Eth Benz Xylenes <br /> ' BTEX 1.04 102 100 96 105 <br /> TPH Gasoline 108 TPH Diesel 98 <br /> TRPH (418.1) N/A Motor 03.1 102 <br /> xatrsx Spike Recoveries MS MSD RPD <br /> MTBE 95 87 9 <br /> ' BTEX Benzene 97 91 6 <br /> Toluene 93 85 9 <br /> Ethyl Benz 101 94 7 <br /> ' Xylenes 99 95 4 <br /> TPH Gasoline 115 109 5 <br /> ' TPH Diesel 105 102 3 <br /> sethod Blank MTBE Benzene Toluene Eth Benz Xylenes <br /> ' BTEX <2 ug/L <.3 ug/L <.3 ug/L <.3 ug/L < 3 ug/L <br /> TPH Gasoline <50 ug/L Diesel/M0 <50 ug/L 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 /> ' TPH Diesel 100 76 5 - 136 <br /> T (418 1) N/A N/A <br /> n daeg, Lab DirectorNa <br /> OFFICE (209)667-5258 FAX (209)667-2581 <br />