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08 July 2008 <br /> AGE-NC Project No.04-1173 <br /> Page 2 of 3 <br /> hammer to drive soil sampling tools to specified depths. Each boring will be advanced at an angle <br /> of approximately 20 degrees to obtain a total depth of approximately five(5)vertical feet. <br /> SOIL SAMPLING COLLECTION AND ANALYSIS <br /> One soil sample will be collected from each boring at a depth of approximately five(5)feet below <br /> surface grade (bsg). Samples will be collected using a 1.125° Geoprobe soil sampling assembly <br /> loaded with four six-inch brass sleeves. Upon sample retrieval,the ends of the second sleeve will <br /> be covered with Teflon sheets,capped and sealed with tape. <br /> Appropriately sealed and labeled samples will be placed in a chilled container under ice and <br /> transported under chain-of-custody procedure to a California Department of Health Services(DHS)- <br /> certified laboratory. Each sample will be analyzed for the following: <br /> • Total petroleum hydrocarbons quantified as diesel(TPH-d)by EPA Method 8015 Modified. <br /> • Benzene,toluene, ethyl benzene and xylenes(BTEX)by EPA Method 8260. <br /> Laboratory reports for ground water analyses,testing methods,laboratory quality assurance/quality <br /> control (QA/QC) reports, and sample chain of custody documentation will be included with the <br /> laboratory report. <br /> EQUIPMENT DECONTAMINATION <br /> Prior to use,all sampling tools used for sample collection will be thoroughly rinsed with clean water <br /> after being washed with a solution of Alconox. All probing rods will be cleaned prior to <br /> advancement at each probe boring location. <br /> BORING ABANDONMENT <br /> The probe boring will be permanently sealed to prevent vertical migration of potential contaminants. <br /> Soil boring shall be abandoned by backfilling with portland cement from the total depth to surface <br /> grade. <br /> Adwneed GeoEnvironncental.Inc. <br />