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Sequoia 660 Chesapeakc Drive Redwood City CA 94063 (650) 364 9600 FAX(650)36, 9233 <br /> S <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510) 988 9673 <br /> Analytical B!9 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> SECOR International Client Project ID ARCO 2133, Stockton, CA Sampled Jun 24, 1998 <br /> 9912 Business Park Dr , Ste 100 Sample Matrix Water Received Jun 25 1998 <br /> Sacramento, CA 95827 Analysis Method EPA 5030/8020 DHS Luft Reported Jul 10 1998 <br /> Attention Rusty Benkosky Lab Project # 5806396 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample Sample Sample Sample Sample Sample <br /> Analyte Limit ID I D ID I D I D 1 D <br /> pg/L S80639600 S80639601 S80539602 S80639603 S80639604 S80639505 <br /> E-2 E-8 E9 E10 E 1 1 E 12 <br /> Purgea6le <br /> Hydrocarbons 50 N D N D N D 15,000 N D N D <br /> Benzene 0 50 N D N D N D 110 N D N D <br /> Toluene 0 50 N D N D N D 130 N D N D <br /> Ethyl Benzene 0 50 N D N D N D 120 N D N D <br /> Total Xylenes 050 N D N D N D 660 N D N D <br /> MTBE 5 0 N D 57 N D 19,000 N D N D <br /> Chromatogram Pattern -- - <br /> Quality Control Data <br /> Reporting Limit <br /> Multiplication Factor 1 0 1 0 1 0 100 1 0 1 0 <br /> Date Analyzed 07/07/98 07/07/98 07/07/98 07/07/98 07/07/98 07/07/98 <br /> Surrogate Recovery % 93 97 97 93 97 90 <br /> (OC Limits = 60-140%) <br /> Purgeable Hydrocarbons are quantitated agamst a fresh gasoline standard <br /> Analytes reported as N D were not detected at or above the reporting limit <br /> Samples were analyzed by STAR Analytical {FLAP#1849) an affiliate laboratory of Sequoia Analytical <br /> SEQUOIA ANALY-TI�AL <br /> 7ZKZdd�a (C Schneider <br /> Project Manager/Sacramento Laboratory <br /> 5806396 SES <1 <br /> .4f� <br />