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ARCADIS Ms. Lori Duncan <br /> March 20, 2009 <br /> The soil types encountered were predominantly silts and silty clay with with sand and <br /> gravel layers encountered at depths below 100 feet bgs. The boring log is included in <br /> Attachment 3. <br /> Soil Sampling <br /> Soil samples were collected using a California-modified split spoon sampler. The <br /> samples were logged for soil characteristics and screened for the presence of volatile <br /> organic compounds (VOC)using a photo-ionization detector(PID). Sixteen soil <br /> samples were collected. The soil sample collected at 115 feet bgs was not submitted <br /> for analysis due to the presence of gravel, and the soil sample collected at 130 feet <br /> bgs was not submitted for analysis due to poor recovery. A total of fourteen soil <br /> samples were submitted to the laboratory for analysis. <br /> Soil Analytical Data <br /> The 14 soil samples were packed on ice, cooled to approximately 4 degrees <br /> centigrade, and shipped, under appropriate chain-of-custody protocols, to Lancaster <br /> Laboratories Incorporated (Lancaster)of Lancaster, Pennsylvania for analysis.The <br /> analytical reports and chains-of-custody documentation are presented in Attachment 4. <br /> Soil samples were analyzed for the presence of the following constituents: <br /> • TPH-GRO (C6-C12), TPH-DRO(C10-C28), total petroleum hydrocarbons as <br /> motor oil (TPH-MO)(C16-C36), and methanol by United States Environmental <br /> Protection Agency(USEPA) Method 8015 <br /> • Benzene, toluene, ethylbenzene; and total xylenes (BTEX) by USEPA <br /> Method 8260 <br /> • Tertiary butyl alcohol (TBA), methyl tertiary butyl ether(MTBE), ethyl tertiary . <br /> butyl ether(ETRE), tertiary amyl methyl ether(TAME), di-isopropyl ether <br /> (DIPE), 1,2-DCA, 1,2-dibromoethane(EDB), and ethanol by USEPA Method <br /> 8260 <br /> Soil Analytical Results <br /> TPH-G, TPH-MO, benzene, MTBE, ETBE, TAME, DIPE, EDB and ethanol <br /> concentrations were below MDLs in all 14 soil samples submitted for chemical <br /> analysis. TPH-DRO, methanol, toluene, ethylbenzene, total xylenes, and TBA were <br /> Page: <br /> \Xerac ofiicedata%Sacrememo-CA\EMACHEVRONOW75%DeVwr&nVZepadsWssessment AddmxVmNx&W75 Re Assessment Addendum Repml_282910950.doc 4/7 <br />