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j <br /> C <br /> three consecutive readings show the parameters are stabilized,a groundwater sample is collected from <br /> the tubing port in front of the flow through cell of the meter. 1 <br /> Water samples will be collected from the tubing and carefully poured into 40-milliliter (ml) glass vials <br /> preserved with hydrochloric acid. The vials wil be filled to produce a positive meniscus and sealed with a <br /> Ccap containing a Teflon® septum, and examined for air bubbles to avoid headspace that would allow <br /> volatilization to occur. The labeled samples will be promptly transported on ice in a thermally insulated ice <br /> chest, accompanied by a.chain-of-custody record, to aCalifornia-certified laboratory. <br /> CSoil and groundwater samples will be analyzed for total petroleumb'ydrocarbons characterized as gasoline <br /> (TPHg), benzene,ethylbenzene, toluene,totals xylenes (BTEX)Jive fuel oxygenates (methyl tert butyl <br /> ether;tertiary butyl alcohol, tertiary-amyl methyl ether, ethyl tert butyl ether, and di-isopropyl ether), and <br /> lead scavengers (ethylene dibromide and 1,;2-dichloroethane) in accordance with EPA Test Method <br /> 82608:, s' <br /> If you have any questions concerning the proposed changes m'the scope of work please contact the <br /> undersigned at(925),460-5300._ <br /> C Respectfully submitted, <br /> ATC ASSOCIATES INC. " <br /> , <br /> Peter Kolodner Scott Perkins <br /> Project Manager Senior Project Manager <br /> l <br /> c� L f� -SvpNAL GED July 24, 2009 <br /> i //- � — —` 445 lac Date <br /> David A. Evans, P.G. 4 OAYIDA EVANS <br /> California Professional Geologist No.8623 <br /> No. 8623 <br /> F OF, C <br /> 3 <br /> Attachments:, <br /> -Revised Proposed Boring Location Map <br /> E <br /> Regulatory Correspondence, j <br /> CAdditional Investigation WNorkplan; May 18, 2009 l I . <br /> r <br /> Additional lm estiption%Vorkplm Addendum <br /> ;Quik Stop No.IN,Stockton,CA p <br /> ,,.,...,,.. July 28,2009 t <br /> }" A <br /> fr to F <br /> I <br />