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AECOMStandard Operating Procedure <br /> DPT Groundwater Sampling <br /> 5.4 Borehole Abandonment <br /> • After sampling, all boreholes must be sealed to prevent the spread of contaminants with <br /> depth and to eliminate direct pathways from the surface to the subsurface and <br /> groundwater. Surface materials such as asphalt and cement that have been drilled or <br /> pushed though must also be repaired to a satisfactory condition. <br /> The drilling subcontractor, under supervision of the rig geologist, will complete borehole <br /> abandonment. The subcontractor will supply all necessary materials listed above. Abandon all <br /> boreholes according to the following procedures: <br /> 1. After a boring has been completed by DPT technique,remove the drive rods,slowly pour the <br /> granular bentonite down the hole,and hydrate with potable water. Alternately,fill hole with <br /> bentonite slung. <br /> 2. If the borehole is through asphalt or concrete,leave the seal below the bottom of the pavement <br /> to allow for sufficient fill and patching material. <br /> 3. Patch pavement with appropriate material. <br /> 4. Mark the boring location with a clearly labeled stake or flag that indicates the site and <br /> borehole number. <br /> 6.0 Training and/or Qualifications <br /> All persons performing the activities described in this SOP must have read and have an understanding of the <br /> contents. An understanding of project-specific plans(e.g.,sampling and analysis plan,QAPP,work plan)and <br /> requirements is also recommended. <br />