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1 <br /> AMERICANCORP <br /> i <br /> AEMC 12/13/90 <br /> 9719 Lincoln Village Dr <br /> Sacramento, CA 95827 <br /> Attn Kathy Amaru <br /> Re Project Homestead Land / Tracy <br /> Prod e c t No <br /> Chain of Custody number 20450 <br /> ' Date Samples Received 11/19/90 Job No 82470 <br /> No Samples Received 6 AELC Lab No L5701 <br /> These samples were received by American Environmental Laboratories in a <br /> �1 chilled, intact state, and accompanied by valid chain of custody <br /> 1111 documentation <br /> The following analyses were performed on the above referenced project <br /> No of <br /> Samples Analysis <br /> �} 4 Organic Lead by Method 7420 10 <br /> J` 4 Ethylene Dibromide, DHS LUFT Method <br /> 4 TPH Gas by LUFT Method <br /> 2 TPH Diesel by LUFT Method <br /> 6 BTEX by LUFT Method <br /> The "TPH as Diesel" data presented here represent measurement of only <br /> those hydrocarbons contained with in the molecular weight range <br /> (C10-C25) which includes the major diesel components Because sample <br /> "T3-3B" contains what appear to be hi&her molecular weight hydrocarbons <br /> than those generally associated with diesel the attached TPH data most <br /> likely understate the magnitude of the total extractable petroleum <br /> hydrocarbon content of these samples In instances where quanitation of <br /> the "heavy hydrocarbons" (C25+) is required, the laboratory strongly <br /> reccomends that a method such as 9071 or modified 418 1 be employed in <br /> addition to gas chromatography as a complimentary analytical technique <br /> TPH (Diesel) matrix spike recovery data could not be generated for QC <br /> Batch 6622 due to the presence of significant concentrations of <br /> petroleum hydrocarbons in the sample selected for spiking <br /> Analytical results are attached to this letter Please call if we can <br /> provide additional assistance <br /> Sincerely, <br /> ' George Hampton <br /> Laboratory Director <br /> 3249 Fitzgerald Road Rancho Cordova CA 95742 Fox(916)638-4510 (916)638 7301 <br />