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05 January 2009 <br /> AGE-NC Project No. 09-1664 <br /> Page 6 of 6 <br /> 4.3. BORING ABANDONMENT AND EQUIPMENT DECONTAMINATION <br /> Each borehole will be permanently sealed to prevent vertical migration of potential contaminants; <br /> the borings shall be abandoned by backfilling with portland cement from the total depth to surface <br /> grade under SJCEHD oversight. <br /> All sampling tools used for sample collection will be thoroughly washed with a solution of Alconox <br /> and rinsed with clean water prior to use. All down-hole drilling and sampling equipment will be <br /> pressure washed prior to starting each boring. <br /> Advanced GeoEwvivewww;wtd.1w <br />