Laserfiche WebLink
I <br /> i <br /> i <br /> APPENDIX A <br /> EXPLORATORY BORING AND WELL INSTALLATION PROCEDURES <br /> The general procedures used in site assessments for drilling exploratory borings, collecting <br /> samples, and installing monitoring wells are described in this appendix These general <br /> procedures are used to provide consistent and reproducible results, however, conditions may <br /> exist where variations of these procedures are applicable The following procedures are <br /> supervised by a California state-registered geologist <br /> Exploratory Soil Borings <br /> Exploratory soil borings will be drilled using 8-inch-diameter, continuous-flight, hollow-stem <br /> auger drilling equipment The dnlling method for sites in which depth to groundwater is greater <br /> than 1.00 feet is determined on a case-by-case basis Soil samples for logging will be obtained <br /> from auger-return materials and by advancing a modified California split-spoon sampler <br /> equipped with brass or stainless steel liners Into undisturbed soil beyond the tip of the auger <br /> Soils will be logged by an Pinnacle geologist according to the Unified Soil Classification System <br /> and standard geological techniques Exploratory soil borings not used for monitoring well <br /> installation will be backfilled to the surface with a bentonite-cement slurry pumped into the <br /> boring through a tremie pipe <br /> The soil sampling equipment will be cleaned with a detergent water solution, rinsed with clean <br /> water, and equipped with clean liners between sampling intervals Augers and samplers will be <br /> steam cleaned between each boring to reduce the possibility of cross contamination Steam <br /> cleaning effluent will be contained in 55-gallon drums and temporanly stored on site The <br /> disposal of the effluent will be the responsibility of the client <br /> Drill cuttings generated during the drilling procedure will be stockpiled on site Stockpiled drill <br /> cuttings will be placed on and covered with plastic sheeting The stockpiled soil is typically <br /> characterized by collecting and analyzing composite samples from the stockpile EMCON will <br /> recommend an appropriate method for disposition of the cuttings based on the analytical results <br /> The client will be responsible for disposal of the drill cuttings <br /> Soil samples for chemical analysis will be collected in brass or stainless steel liners, sealed with <br /> Teflon' tape and plastic end caps, labeled, placed on ice, and delivered to a state-certified <br /> analytical laboratory, along with the appropriate chain-of-custody documentation Soil samples <br /> selected for chemical analysis will be determined from a head-space analysis using a hand-held <br /> sAC\A 1548ON DOC-961mtt I A-1 Pinnacle <br />