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i <br /> Sequoia 680 Chesapeake Dnv- Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> Sequoia <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 919 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> RECEIVED <br /> • APR 14 1998 <br /> d------_------ <br /> Ground Zero Analysis, Inc Client Prol I© 96-163, Knowles Roek <br /> 1714 Main St Sample Descrlpt KR Ef#lu-A Sampled 03/27/98 <br /> Escalon, CA 95320 Matrix AIR Received 03/27/98 <br /> 1 Analysis Method 8015Mod/8020 <br /> Attention Greg Stahl Lab Number 9803103-01 Analyzed 03/29/98 <br /> -- _- Reported 03J30198 <br /> QC Batch Number GC032998BTEX02A <br /> E Instrument ID GCHP02 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX <br /> Analyte <br /> Detection Limit Sample Results <br /> ug/L ug/L <br /> TPPH as Gas <br /> f Benzene 25 93 <br /> Toluene25 N D <br /> Ethyl Benzene 025 030 <br /> Xylenes (Total) 0 25 0 31 <br /> Chromatogram Pattern 025 2 7 <br /> Gas <br /> Surrogates Control Limits % <br /> Trrffuorotoluene % Recovery <br /> 70 130 113 <br /> 1 <br /> t <br /> f <br /> I <br /> f <br /> e <br /> I <br /> E <br /> 6 <br /> I <br /> kR <br /> f <br /> I <br /> I <br /> p� <br /> 4 Analytes reported as N D were not present above the stated limit of detection <br /> SEQ LYTICAL - ELAP #1210 <br /> g enner <br /> Protect Manager <br /> Page 7 <br />