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i <br />' CASTLE ANALYTICAL LABORATORY - PORTERVILLE <br /> Environmental Testing Services 2780 Yowlumne Ave, Suite C Phone (559)781-6099 <br />' Portervdle,CA 93258 Fax (559)781-6091 <br /> Advanced GeoEnvironmental, Inc Client Project ID Pacific Car Wash Sample Prep Method SW3050 <br /> of Northern California Reference Number P133/5946 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 /> mq/kq m /kmglkg mg/k %R <br /> COMPOUNDS <br /> Lead 5 D NO 625 980% 80-120 <br />' Spiking MATRIX MATRIX %R %RPD <br /> Level SPIKE SPIKE DUP Limits <br /> mg/kg %R %R <br />' COMPOUNDS <br /> Lead 625 988% 109% 70-130 500% <br /> 1 <br />' The LCS(Laboratory Control Spike)is a control sample of known interferent free matrix that is fortified with 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 OC limits and recoveries for MS/MSD's are advisory only and are not used to accept or <br /> reject batch results <br />' APPROVED BY <br /> Jame <br /> Ph+!lips <br /> La ratory Director <br /> 1 <br />