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22 February 2008 <br /> AGE-NC Project No. 07-1586 <br /> Page 4 of 4 <br /> equipped with 1.25-inch probing rods.The Geoprobe advances soil probe borings using a hydraulic <br /> hammer to drive soil sampling tools to specified depths. <br /> 4.2. SOIL SAMPLE COLLECTION AND ANALYSIS <br /> Soil samples will be collected from 1-foot and 2.5-feet bsg in each boring. Samples will be collected <br /> using a 1.5-inch Geoprobe soil sampling assembly loaded with four six-inch stainless steel sleeves. <br /> Upon sample retrieval, ends of the second sleeve will be covered with Teflon sheets, capped and <br /> sealed with tape. Each sample sleeve will be labeled with the boring designation,depth,time,date, <br /> and sampler's initials,placed in a chilled container under ice,and transported under chain-of-custody <br /> procedure to a CDPH-certified laboratory. <br /> Soils encountered in the borings will be visually classified by an AGE professional in accordance <br /> with the Unified Soil Classification System.Additionally,soil samples will be field-screened for the <br /> presence of volatile organic compounds using an organic vapor meter, equipped with a photo- <br /> ionization detector. <br /> 4.3. 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 /> 4.4. BORING ABANDONMENT <br /> All probe borings will be permanently sealed to prevent vertical migration of potential contaminants. <br /> Soil borings shall be abandoned by backfilling with portland cement from the total depth to surface <br /> grade. <br /> Advanced GeoEn ironmental,Inc. <br />