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14 September 1998 AGE-NC Project No. 98-0454 Page 4 of 5 3.4. REPORT PREPARATION Upon completion of field work and receipt of final laboratory analysis, a report will be prepared presenting the findings of the investigation. The report will include a description of the work performed and results of the sampling and analysis. Conclusions and applicable recommendations will be included in the report. The report will be in a format acceptable to the PHS-EHD and the CVRWQCB, and will be reviewed and signed by a California Registered Geologist. 4.0. FIELD PROCEDURES All field procedures will be overseen by, an.AGE representative under the supervision of a California Registered Geologist.Procedures for the advancement of probe borings,soil-vapor sampling,ground water sampling, equipment decontamination and sample shipment are outlined below. 4.1. PROBE BORING ADVANCEMENT Probe borings will be advanced using AGE's van-mounted Geoprobe 5400 direct-push probing unit equipped with 1.25-inch probing rods. The Geoprobe advances soil probe borings using a hydraulic or pneumatic hammer to drive soil and ground water sampling tools to specified depths. 4.2. SOIL-VAPOR SAMPLING PROCEDURES Soil probe borings.proposed for soil-vapor sampling will be advanced to 5 feet bsg. However,total depths of probe borings will be based on field observations and field screening using an organic soil- vapor monitor(OVM). Each probe boring will be advanced using a van-mounted Geoprobe 5400 probing unit equipped with 1.125-inch diameter rods. Soil-vapor samples will be collected using a Geoprobe soil vapor assembly.- The ssembly:The vapor sapling assembly consists of an expendable vapor point placed into a point holder at the bottom of a string of 1-inch diameter hollow drive rods. The assembly will be advanced to the specified depth and retracted between six inches in order to engage the expendable point into the soil and expose a column of strata from which soil-vapor can be extracted. A post run tubing adapter equipped with an O-ring to ensure a vacuum-tight seal will then be attached to a ''/<-inch diameter, single use, disposable polyethylene tubing. The sampling tube will then lowered through the center of the hollow drive rods and secured by threading into the expendable point holder. Above ground,the polyethylene..tubing will be attached to a stainless steel T-valve. This valve will then be connected to vacuum pump. Advanced GeoEnvironmental,Inc.