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I r <br /> I November 2004 <br /> AGE-NC Project No 99-0624 <br />' Page 10 of 13 <br />' 47 REPORT PREPARATION <br /> Following the site investigation and soil and ground water sample analysis,a report will be prepared <br /> I presenting the findings The report will include a description of work performed, results of the soil <br /> and ground water sampling and analysis, conclusions, and recommendations The report will be in <br /> a format acceptable to RWQCB guidelines, and will be reviewed and signed by a California <br />' Registered Geologist <br />' 5.0. FIELD PROCEDURES <br /> All field procedures will be overseen by an AGE representative under the supervision of a California <br /> Registered Geologist Procedures for soil boring advancement,soil,ground water and gas sampling, <br /> equipment decontamination and sample shipment are outlined and described below <br /> 5 1 PROBE BORING ADVANCEMENT <br /> Probe borings will be advanced to depths of 15 feet bsg using a van-mounted Geoprobe 5400 direct- <br /> push probing unit equipped with 1 25-inch probing rods The Geoprobe advances soil probe borings <br /> Iusing a hydraulic hammer to drive soil sampling tools to specified depths <br />' 52 COLLECTION OF SOIL GAS SAMPLES <br /> Soil gas samples will be obtained at a depth of approximately 15 feet bsg in each boring Samples <br />' will be collected using a Geoprobe soil vapor assembly An expendable vapor point will be placed <br /> into a point holder at the bottom of a string of 1-inch diameter hollow drive rods The assembly will <br /> then be advanced to the specified depth and retracted between six inches in order to engage the <br />' expendable point and expose a column of strata from which soil gas can be extracted A post run <br /> tubing adapter equipped with an O-ring to ensure a vacuum-tight seal is then attached to a '/4-inch <br /> diameter, single use,disposable polyethylene tubing The sampling tube is then lowered through the <br /> I center of the hollow drive rods and secured by threading into the expendable point holder The probe <br /> rod is retracted a minimum of two feet,placing the expendable tip in soil and creating a void open <br /> boring <br /> Aboveground,the polyethylene tubing is attached to a vacuum sampling chamber A Tedlar bag will <br /> �' , <br /> placed into the vacuum chamber The sampling tube will be attached directly to the Tedlar sampling <br /> bag, through a collapsible,air tight port The vacuum chamber is then sealed The vacuum will then <br /> . be used to purge the exposed soil column, through the sampling tubing, until approximately three <br />' Advanced GeoEnvironmental,Inc <br /> I <br />