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08 September 2000 AGE -NC Project No. 97-0372 Page 13 of 18 inaccessible to the geoprobe. Areas inside the building that are not accessible by the van -mounted Geoprobe will be addressed with a Power Probe remote probing unit that is powered by the Geoprobe hydraulic system and can reach 70 to 100 feet from the van. The Power Probe unit is bolted to the concrete floor over the desired probing position, and the probe boring is advanced utilizing the same technology of the Geoprobe unit. The geoprobe advances borings utilizing direct push technology and does not generate soil cuttings that will require containerization and disposal. The pushing force is generated through hydraulic pushing and mechanical hammering. The geoprobe advances a nominal 2 -inch diameter boring by pushing a 2 -inch diameter soil sampler on the leading end of a string of 1.25 -inch diameter steel rods. The soil sampler is loaded with four 6 -inch long brass sleeves having a 1.125 -inch diameter. For the continuous borings, a 2 -inch diameter, 4 -foot length acetate sleeve will be utilized in a slightly larger soil sampler. The geoprobe can be utilized to cut holes in the concrete or asphalt prior to advancing each boring. Upon cutting through the paving material, the cutting tool is replaced with the brass -sleeve -loaded or acetate -sleeve loaded soil sampler and is advanced to the first soil sampling depth. Hand -auger borings, if needed, will be advanced through precut holes in the concrete flooring utilizing a common hand auger assembly. Upon reaching the desired sampling point, a soil sample will be collected utilizing a hammer -driven metric soil sampler loaded with one 2 -inch by 6 -inch brass sleeve or two 2 -inch by 3 -inch brass sleeves. Upon recovering the soil -filled brass -sleeves, the leading brass sleeve will be preserved by covering the open ends with a sheet of Teflon, capping, and sealing with duct tape. The acetate sleeves will be cut from the sleeve in 6 -inch lengths with a knife for samples selected from the continuous core, which will be preserved in the same manner. Labels with the boring designation, sampling depth, sampling date and time, and the sampler's initials will be put on each sample collected. The properly preserved samples will be recorded on a chain -of -custody and will be stored in a chilled container pending shipment to a California Department of Health Services (DHS) -certified analytical laboratory for analysis. Soil sample duplicates will be described and logged in accordance with ASTM Standard D 2488, as per DTSC requirements. The soil samples will also be screened utilizing an organic vapor analyzer equipped with a photo -ionization detector (PID) pre -calibrated to 100 parts per million isobutylene. The soil logs will be utilized to construct cross-sections in the field to guide soil sampling. Advanced Geo Environmental, Inc