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17 August 2012 <br /> AGE-NC Project No. 01-0887 <br /> Page 4 of 6 <br /> Laboratory reports for soil-vapor analyses, testing methods, laboratory quality <br /> assurance/quality control (QA/QC) reports, and sample chain of custody documentation <br /> will be presented in a report with findings and recommendations. <br /> REPORT PREPARATION <br /> Following the completion of the proposed scope of work, a report will be prepared <br /> presenting the findings. The report will include a description of work performed and the <br /> results of the soil-vapor sampling and analysis. Conclusions and recommendations will <br /> also be included in the reports, if applicable. The report will be in a format acceptable to <br /> the CVRWQCB guidelines, and will be reviewed and signed by a California Professional <br /> Geologist. <br /> FIELD PROCEDURES <br /> All field procedures will be overseen by an AGE representative under the supervision of <br /> a California Professional Geologist. Procedures for soil goring advancement, soil-vapor <br /> sample collection, equipment decontamination and boring abandonment are presented <br /> below. <br /> SOIL-VAPOR PROBE BORING ADVANCEMENT <br /> Each probe boring will be advanced to a maximum depth of three feet bsg using a truck <br /> mounted AMS Powerprobe direct push probing unit equipped wi 1.25-inch, stainless <br /> steel, hollow probing rods. The powerprobe rods are advanced using a hydraulic hammer <br /> to drive the attached soil vapor sampling tool to specified depths. Proposed boring <br /> locations are presented in Figure 2. <br /> SOIL-VAPOR SAMPLING <br /> Soil-vapor samples will be obtained at a depth of approximately three feet bsg in each <br /> boring. Samples will be collected using a Geoprobe soil-vapor assembly.-n expendable <br /> vapor point will be placed into a point holder at the bottom of an assembly of 1.25-inch <br /> diameter hollow drive rods. The assembly will then be advanced to the specified depth and <br /> retracted approximately sixinchgs in order to disengage the expendable point and expose <br /> a column of strata from which soil vapor can be extracted. A single use, '/4-inch diameter <br /> disposable polyethylene tubing is then attached to a tubing adapter equipped wiffi—an <br /> Advanced CeoE nviro n mental,Inc. <br />