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CHROMALAB, INC <br /> 5 QAYS 7UANARw1JNf7 <br /> Analytical Laboratory(E694) <br /> October 3 , 1991 ChromaLab rile No. : 0991209 <br /> ARTESIAN ENVIRONMENTAL CONSULTANTS <br /> Attn: James A. Jacobs <br /> RE: Six water samples for Gasoline/BTEX analysis <br /> Project Name: EXXON (STOCKTON) <br /> Project Location: 3128 W . Ben Holt Dr. , Stockton, CA <br /> Project Number: SS #73330; 014-01-01 (Artesian) <br /> Date Sampled : Sept. 25, 1991 Date Submitted : Sept. 26, 1991 <br /> Date Extracted: Oct. 1 , 1991 Date Analyzed: Oct. 1 , 1991 <br /> RESULTS: <br /> Ethyl T,)tal <br /> Sample Gasoline Benzene Toluene Benzene Xylenes <br /> ( ug-ZI ) (.lx�/i ) (u�/1 )..,_ (ug/1 ) hug/, ) <br /> MW-1 N.D. N. D. N.D. N.D. N.D. <br /> MW-2 3200 1600 11 60 170 <br /> MW-3 N.D. N. D. N.D. N.D. N.D. <br /> HW-4 N.D. N. D. N.D. N. D. N.D. <br /> H14-5 N. D. N. D. N.D. N. D. N.D. <br /> MW-6 N.D. N. D. N.D. N . D. N.D. <br /> BLANK N.D. N. D. N.D. N.D. N.D. <br /> SPIKE RECOVERY 98.0% 88 . 7% 96. 3% 97 .0% 95 . 9% <br /> DUP SPIKE REC. 91 .8% 88 .95 84 . 3% 84 . 7% 82. 9% <br /> u DETECTION LIMIT 50 0. 5 0. 5 0. 5 0 .5 <br /> METHOD OF 5030/ <br /> ANALYSIS 8015 602 602 602 602 <br /> CbromaLab, Inc . <br /> ung Eric Tam <br /> Chief Chemist Laboratory Director <br /> . 2239 Omega Road, #1 San Ramon, Calitornia 94583 <br /> 510/831-1788 Facsimile 510/831.6798 <br /> Federal ID#68.0140157 <br />