Laserfiche WebLink
APPENDIX B <br /> Boreholes drilled for the exploratory soil sampling and monitoring well installation will be drilled using a <br /> truck-mounted drill rig. The boreholes will be advanced using 8-inch hollow stem augers for the exploratory <br /> soil sampling phase and the monitoring well installations. No fluids will be added to the boreholes during <br /> the drilling operations. Borehole logging and sampling will be conducted by a PG&E Technical and <br /> Ecological Services - Civil Unit contract staff geologist. <br /> The soil samples will be visually classified (ASTM D-2488-84) and logged by the on-site contract staff <br /> geologist. Soil samples from all of the borings will be obtained at intervals of five feet or less. Soil samples <br /> will be taken from the borings with a 2.0-inch I.D. split spoon sampler containing three 2.0-inch X 6-inch <br /> brass tube liners. The sampler will be driven 18 inches into the undisturbed soil beyond the tip of the auger <br /> by a 140-pound safety hammer with a 30-inch drop. Prior to the drilling of each borehole, the hollow stem <br /> augers, drill bit, and drill rods will be steam cleaned. Upon completion of the borings, the boreholes will be <br /> backfilled with a cement grout (using a tremie method). <br /> 462891/42/PPU26 B-1 <br />