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Appendix B-1 <br /> EXPLORATORY BORING AND <br /> ' ONE TIME GROUNDWATER SAMPLING PROCEDURES <br /> ' The general procedures used in site assessments for drilling exploratory borings, <br /> and collection of groundwater samples on a one time basis, "grab sample" are <br /> described in this appendix These general procedures are used to provide <br /> consistent and reproducible results, however, conditions may exist where variations <br /> of these procedures are applicable The following procedures are supervised by a <br /> California State-registered geologist or civil engineer <br /> ' Exploratory Borings for Collection of Ground water Samples <br /> ' Exploratory borings will use the cone penetration test (CPT) methodology The <br /> drilling method for sites in which depth to groundwater is greater than 100 feet is <br /> determined on a case-by-case basis <br /> The sampling equipment will be cleaned with a detergent water solution, rinsed with <br /> clean water, and equipped with clean liners between sampling intervals Augers <br /> ' and samplers will be steam cleaned or washed in a tri-sodium phosphate solution <br /> and rinsed with clean water between each boring to reduce the possibility of cross <br /> contamination Cleaning effluent will be contained in DOT approved 55-gallon <br /> ' drums and temporarily stored on site The disposal of the effluent will be the <br /> responsibility of Western Oil and Spreading, Inc <br /> ' There are no drill cuttings generated during the CPT procedure <br /> When water samples for chemical analysis are collected they will be in amber glass <br /> ' laboratory furnished 1 liter jars with screw tops <br /> A duplicate water sample will be subjected to head-space analysis using a hand- <br /> held photo-ionization detector (PID) The water will be placed in a glass jar, <br /> sealed, and placed in a warm atmosphere After approximately 15 minutes, which <br /> is generally sufficient for volatiles to escape from the water, the PID probe will be <br /> inserted into the container The total volatile hydrocarbons present are detected by <br /> ' the PID and reported in parts per million The PID will be calibrated to any <br /> isobutylene standard The very low levels expected may not register on the PID In <br /> ' the event they do a second hole further away from the source will be placed and <br /> the procedure repeated <br /> B-'t <br />