Laserfiche WebLink
' Appendix B <br /> ' EXPLORATORY BORING AND <br /> WELL INSTALLATION PROCEDURES <br /> t The general procedures used in site assessments for dnlling exploratory borings, <br /> collecting samples, and installing monitoring wells are described in this appendix <br /> These general procedures are used to provide consistent and reproducible results, <br /> ' however, conditions may exist where variations of these procedures are <br /> applicable The following procedures are supervised by a California State- <br /> registered geologist <br /> Exploratory Soil Borings <br /> ' Exploratory soil bonngs for sites characterized by relatively shallow (less than 100 <br /> feet deep) groundwater are generally drilled using 8- to 12-inch-diameter, <br /> ' continuous-flight, hollow-stem auger drilling equipment The drilling method for <br /> sites in which depth to groundwater is greater than 100 feet is determined on a <br /> case-by-case basis Soil samples for logging will be obtained from auger-retum <br /> materials and by advancing a modified California split-spoon sampler equipped <br /> with brass or stainless steel liners into undisturbed soil beyond the tip of the auger <br /> Soils will be logged by a geologist according to the United Soil Classification <br /> ' System and standard geological techniques Exploratory soil bonngs not used for <br /> monitoring well installation will be backfilled to the surface with a bentonite cement <br /> slurry pumped into the boring through a tremie pipe <br /> ' The sod sampling equipment will be cleaned with a detergent water solution, rinsed <br /> with clean water, and equipped with clean liners between sampling intervals <br /> Augers and samplers will be steam cleaned between each boring to reduce the <br /> possibility of cross contamination Steam cleaning effluent will be contained in 55- <br /> gallon drums and temporarily stored on site The disposal of the effluent will be <br /> ' the responsibility of Western Oil and Spreading, Inc <br /> Drill cuttings generated during the drilling procedure will be stockpiled on site <br /> ' Stockpiled drill cuttings will be placed on and covered with plastic sheeting The <br /> stockpiled soil is typically characterized by collecting and analyzing composite <br /> samples from the stockpile Western Oil and Spreading, Inc will recommend an <br /> ' appropriate method for disposition of the cuttings based on the analytical results <br /> and will be responsible for disposal of the drill cuttings It is anticipated cuttings will <br /> be remediated with other contaminated soil <br /> ' B B-1 <br />