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• <br /> r• <br /> Anomalies mayor may not have paired high and low values creating what are known as"dipoles". <br /> Isolated dipoles are often, but not always, attributed to a single magnetic object such as a UST, <br /> vault, buried ordnance, etc. Isolated high or low values are known as "monopoles". Monopoles <br /> that are centered on a single data point and limited in extent to roughly the data point spacing <br /> of the sampling grid are often caused by small, near surface objects. Such objects are typically <br /> well caps, pull boxes, balls of wire, etc. Larger monopoles that extend across an area equal to <br /> several data point station spacings are typically associated with larger objects such as steel <br /> cased wells, ends of long pipes, etc. <br /> • A-3 <br />