Subsurface borings for soil investigation and for monitoring well construction are drilled with a CME-45 or equivalent drilling rig. Drilling locations are selected and/or reviewed by a registered Geologist. Where underground petroleum lines or utilities are a possibility the drilling rig is used to initially penetrate any surface concrete or asphalt and a hand auger is used to penetrate to a depth of five feet below land surface. Subsequent soil samples are obtained with a split-spoon sampler at five-foot intervals in each soil test boring, in accordance with ASTM protocols, to the total depth of the borehole.