Strategic Placement of Test Holes in HDD Projects
While evenly spaced test holes, such as every 500 to 700 feet, are common, it's crucial not to overlook areas that require special attention. For example, visible anomalies like rock outcrops, clay surfaces, or creek crossings should prompt additional test holes to better understand the subsurface conditions in those spots. Typically, test holes are drilled 30 to 60 feet below the planned drill path to gather comprehensive data. For shorter bores under 1,000 feet, two test borings are usually placed at each end, while longer drills may require holes at 500 to 1,000-foot intervals. This approach ensures that the subsurface conditions along the entire drill path are well understood, reducing risks and improving the accuracy of the design and construction process.
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