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40,6#01 rtekntcs 1= Page 4 Additional Site Characterization Work Plan Project No.724.2 June 27,2002 Ldevelopment. All development and purge water will be containers - p p p g zed to 55 gallon DOT approved containers and stored on site until their disposition can be arranged. L2.1.4 Well Head Elevation& Location Survey In accordance with Assembly Bill 2886, the location and elevation of the new well casings will be determined by a licensed surveyor. The surveyor will reference the casings into a benchmark elevation and this data will be included in future groundwater monitoring Lreports. 2.2 Groundwater Monitoring LThe new wells will be incorporated into the current quarterly sampling/monitoring schedule. 2.2.1 Groundwater Sampling Procedure Before sampling is attempted, the wells will be sounded for depth to water and then a clear disposable bailer will be used to determine if floating product is present. The wells will be Lpurged of at least 3 well volumes of stagnant water using a submersible pump, a dedicated Watenra pump or a stainless steel bailer. Purging will continue until the temperature, conductivity, and pH of the groundwater has stabilized (<10% variation between three Lreadings) indicating that formation water representative of aquifer conditions entering the well is being sampled. These water quality parameters are measured at intervals of each well volume purged. LA stainless steel bailer, p disposable plastic astic bailer or dedicated Waterra pump will be used to L collect each sample. Care will be taken to minimize sample agitation from the initial filling of the bailer to the transfer of the sample to the VOA vial and glass amber liter bottles. Once the sample container is filled and capped, the bottle will be inverted, tapped, and L checked for headspace bubbles. The sample container is identified and labeled with a unique designation, inserted into foam holders and placed in an ice chest cooled to 4°C for transport to the laboratory. LAll non-disposable sampling equipment will be decontaminated using a steam cleaner before and between uses. The effectiveness of the decontamination procedure is ensured by Lusing the following quality control measures: • Disposable gloves will be used by the technician to collect all samples and will be Lchanged with each sampling event. • A bailer blank for each well will be collected prior to sampling by filling the L decontaminated stainless steel bailer with water (provided by the laboratory) and then filling a VOA vial (provided by the laboratory) using the same procedures for actual sample collection.