Magnetic survey of the Risher Road Open Metal Pit Waste Unit

摘要

The Risher Road Waste Unit is located at the base of a small bluff (approximately 30 ft high) composed of sand and gravel. Due to collapse of the face of the bluff a steep slope of colluvium has formed at the base. The area of investigation is located on the slope of colluvium, and is marked by the presence of two pin flags spaced approximately 25 ft apart parallel to the bluff face. In order to investigate the presence of buried metallic material that might indicate waste containers or other wash beneath the colluvial slope a magnetometer survey was conducted in and around the vicinity of the pin flags. The survey consisted of a 5-ft by 5-ft square grid node pattern in a 40-ft by 60-ft rectangle. Magnetic field and gradient anomalies were detected in the locations of the pin flags and can be attributed to the ferric composition of the pin flag shafts. Other magnetic field and gradient variations are at background levels and do not indicate the presence of buried ferric objects of any significant size.