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1 • i <br />' ARCADIS HL Ms. Victoria McCartney <br />July 12, 2007 <br />' Soil Cuttings and Rinsete Water <br />' Soil cuttings generated during drilling operations will be containerized in 55 -gallon <br />drums and temporarily stored on the subject property pending characterization and <br />disposal. Soil cuttings will be removed by Chevron's disposal contractor to an <br />' appropriate disposal facility. Water generated during steam cleaning, and sampling <br />of the borings will be temporarily stored in DOT -approved 55 -gallon drums pending <br />transport by Chevron's disposal contractor to an appropriate disposal or treatment <br />' facility. <br />Groundwater Sampling <br />The newly installed groundwater monitoring wells will be developed and sampled a <br />minimum of 48 -hours following installation. Groundwater samples collected from the <br />monitoring well network (existing wells and newly installed wells) and submitted to a <br />State of California certified laboratory under chain -of -custody documentation and <br />analyzed for the following constituents: <br />' Total petroleum hydrocarbons in the gasoline range [fPH-G (C6-C,o)], total <br />petroleum hydrocarbons in the diesel range [rPH-D (C10 -C28)], and total <br />petroleum hydrocarbons in the motor oil range [rPH-MO (C,, -C16)] by United <br />' States Environmental Protection Agency (USEPA) Method 8015 <br />Benzene, toluene, ethylbenzene, and total xylenes (BTEX) by USEPA Method <br />' 82606 <br />• Tertiary butyl alcohol (TBA), methyl tertiary butyl ether (MTBE), ethyl tertiary <br />' butyl alcohol (ETBE), tertiary amyl methyl ether (TAME), and 1,2-dichloroethane <br />(1,2 -DCA), by USEPA Method 8260B <br />Reporting <br />A report will be prepared to document the site assessment activities performed. This <br />report will include the following: <br />' Summary of site conditions and background information <br />• a scaled site plan illustrating the groundwater monitoring well locations and <br />other relevant site features <br />' Page: <br />4/5 <br />G ON IIWGCUTNDM7111L WaMNn Ex <br />