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GROUND ZERO ANALYSIS,INC. Quality Control/Quality Assurance Plan <br /> 4.0 EQUIPMENT DECONTAMINATION <br /> All equipment used for drilling and sampling will be decontaminated prior to use. All equipment <br /> used for collection of more than one sample, such as bailers and spoons, will be decontaminated <br /> between each use to prevent cross contamination between samples. Drilling equipment will be <br /> decontaminated prior to commencing drilling at each hole. Well construction materials will be <br /> cleaned as necessary,prior to installation. <br /> Equipment and well material decontamination will be conducted on an impermeable surface and all <br /> decontamination effluent will be contained. All surfaces of the equipment will be thoroughly <br /> decontaminated using a steam cleaner. The equipment will be placed on a drying rack for air drying. <br /> The decontamination water will be stored in containers certified for hazardous materials storage and <br /> disposed of in an approved manner. <br /> Sample equipment to be used for pesticides and organic analysis will be washed in a nonphosphate <br /> detergent(Alconox or equivalent) and rinsed with tap water and deionized water. <br /> 5.0 FIELD EQUIPMENT CALIBRATION AND MAINTENANCE <br /> The following measuring equipment may be used during the Remedial Investigation. Equipment is <br /> grouped by field activity. Calibration procedures and frequency are listed for each piece. <br /> • Soil Borings and Well Dimensions <br /> Steel and coated cloth tape. Calibration: none. <br /> • Water Level Measurements in Wells <br /> Steel surveyors tape. Calibration: manufacturer supplied temperature correction will <br /> be applied as applicable for field conditions. Electrical well sounders. Calibration: <br /> check against steel surveyor's tape. <br /> • Organic Vapors <br /> Photoionization detector. Calibration: Daily logged field calibration using an <br /> isobutylene standard as per manufacturer's instructions. <br /> • Groundwater pH Measurements <br /> Digital pH meter. Calibration: standard pH solutions of 4, 7, and 10 will be utilized <br /> for daily logged field calibration according to manufacturer's instructions. <br /> • Electrical Conductivity <br /> Electrical conductivity meter. Calibration: factory-calibrated annually and <br /> periodically calibrated against laboratory prepared standard calibration solution. <br /> • Water Temperature <br /> Mercury or digital thermometers. Calibration: one-time factory-calibrated. <br /> • Combustible Gas/Oxygen- <br /> Combustible gas/oxygen meter calibration: Factory calibrated, field calibrated <br /> monthly, zeroed daily according to manufacturer's instructions. <br /> • Other Field Instrumentation or Equipment- <br /> Calibration procedures for any other instrumentation or equipment used will be <br /> documented at the request of the client or regulatory authority. <br /> G:\Data\GROUNDZE\STALLWORTH AUTO SALES(N CA)1380\Workplan\QA.QC Plan.docx <br /> 5 <br />