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Field Practices and Procedures <br /> Page 5 <br /> retracted from the hole Continuous grouting will prevent cross contamination of water <br /> bearing zones that can occur through an open borehole The boring will be backfilled to <br /> surface grade An asphalt patch will be placed over the borehole <br /> Direct Push Technolozy, Water Samphn-a <br /> A well known example of direct push technology for water sampling is the Hydropunch� <br /> For the purpose of this field method the term hydropunch will be used instead of direct <br /> push technology for water sampling <br /> The hydropunch is typically used with a drill rig A boring is drilled with hollow stem- <br /> augers to dust above the sampling zone In some soil conditions the drill rig can push <br /> directly from the surface to the sampling interval The hydropunch is conveyed to the <br /> bottom of the boring using drill rods Once on bottom the hydropunch is driven a <br /> maximum of five feet The tool is then opened by lifting up the drill rod no more than <br /> four feet Once the tool is opened, water enters and a sample can be collected with a <br /> bailer or tubing utilizing a peristaltic pump Soil particles larger than slit are prevented <br /> from entering the tool by a screen within the tool The water sample is collected, labeled, <br /> and handled according to the Quality Assurance Plan <br /> M\Field PracticesWield P and P with CPT for Joes-revised 07-2004 by SJC doe <br />