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Work Plan for Refned Plume Definition and Management of Floating Product-7500 W 11th St., Tracy, CA. Page 27 �,. Total Xylene Isomers EPA Method 8260B tertiary-Butyl alcohol EPA Method 8260B Methyl-tertiary butyl ether EPA Method 8260B Di-isopropyl ether EPA Method 8260B DC -- Ethyl tertiary-butyl ether EPA Method 8260B � ��Z r, Tertiary-amyl methyl ether EPA Method 8260B STL's laboratory is certified by the DHS to perform the groundwater analyses listed above. 7.7.5 Disposal of Purge Water Purge water temporarily held in the 1000-gallon holding tank will be shipped to a permitted recycling facility for disposal when sufficient quantity has accumulated for that to be done economically following several rounds of groundwater sampling and analysis. 7.8 Field Modification It is planned that the wells will be located at the approximate locations previously described and that soil samples will be recovered from them at the approximate 5-ft. specified depth intervals. However, when appropriate, the California-licensed geotechnical engineer in responsible charge of the project will use visual and olfactory indicators of the presence or absence of hydrocarbons in soil cores and the details of the stratigraphy revealed in the borings to select the final locations for the push probe and well borings, the depths at which soil samples will be recovered, the total depth of the borings and the screened intervals and other construction details of the wells. In making these field decisions, the engineer will , apply the principals of the observational method (Peck 1969), a founding principal of geotechnical engineering practice that was belatedly recognized by the USEPA as an essential element of cost-effective environmental site characterization programs (United States Environmental Protection Agency 1997). 7.9 Schedule It is estimated that it will take approximately two months from the time the project is authorized to obtain authorization from the property owner to install groundwater-quality monitoring wells on private land, obtain monitoring well permits from the SJCEHD, encroachment permits for installation of monitoring wells in public highways from the SJCPWD and obtain the necessary bonds for the latter wells. We expect the drilling contractor to be able to mobilize to the field within three weeks of access to the well sites being granted. Installation of the wells will require four days and, sic