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I CASTLE ANALYTICAL LABORATORY - PORTERVILLE <br /> • Environmental Testing Services 2780 Yowlumne Ave , Suite C Phone (559)7876099 <br /> Porterville,CA 93258 Fax(559)781-6091 <br /> Advanced GeoEnvironmental Inc Client Protect ID Top Filling Station Sample Prep Method SW3050 <br /> of Northern California Reference Number P131 15924 Analysis Method SW6010C <br /> 837 Shaw Road Sample Description SOIL Prepared 08-13-03 <br /> Stockton CA 95215 Instrument ID TJA 61E Analyzed 08-14-03 <br /> Attn Tim Cuellar Reported 08-18-03 <br /> QUALITY CONTROL DATA REPORT <br /> SPIKE ID ICP 8133 <br /> Reporting BLANK Spiking Control %R <br /> Limit Result Level Spike Limits <br />' <br /> mg/kg rng1kg mg/kg %R <br /> COMPOUNDS <br /> Lead 1 50 ND 626 980% 80-120 <br /> I Spiking MATRIX MATRIX %R %RPD <br /> Level SPIKE SPIKE DUP Limits <br /> m /k %R %R <br />' COMPOUNDS <br /> Lead 625 988% 109% 70-130 500% <br /> lie <br /> I <br /> 1 <br /> 1 <br /> I <br />' The LCS(Laboratory Control Spike)is a control sample of known interferent free matrix that is fortified oath representative analytes and <br /> analyzed using the same reagents preparation and analytical methods employed for the samples The LCS%recovery is used for validation <br /> of sample batch results Due to matrix effects the QC limits and recoveries for MSIMSD's are advisory only and are not used to accept or <br /> reject batch results <br />' APPROVED BY <br /> JltoMfy <br /> llips <br /> Lirector <br /> 1 <br />