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RFlM1�X-�1fRAfR <br /> Mr. Charles Leubner <br /> 6 February 1998 <br /> Page 4 <br /> at least three well volumes of water will be purged from the well. All development and purge water <br /> will be containerized in 55-gallon drums, labeled and stored on site for subsequent disposal. <br /> During purging of the wells, field parameters (pH, electrical conductivity and temperature) will be <br /> monitored. Purging will continue until field parameters have stabilized or a minimum of three well <br /> volumes are removed. Samples will be collected in containers obtained from and prepared by the <br /> analytical laboratory according to the requirements for the specific analysis. <br /> After the samples are collected, the bottles will be immediately sealed and labeled. The samples <br /> from each well will be identified with a unique sample number, the project number, date and time <br /> collected, sample Iocation and sampler's name. After labeling, each sample bottle will be placed in <br /> a chilled ice chest delivered under chain-of-custody protocol to a State-certified laboratory. <br /> Task 2 -Laboratory Analyses <br /> Three soil and one groundwater sample will be analyzed for total petroleum hydrocarbons as <br /> gasoline (TPH-G) by EPA Method 8015 and benzene, toluene, xylenes and ethylbenzene by EPA <br /> Method 8020. The water sample will also be analyzed for the presence of fuel oxygenates by <br /> EPA Method 8260. <br /> Task 3—Submit Groundwater Investigation Report <br /> Following receipt of laboratory results for soil and groundwater samples, a report will be <br /> prepared presenting the results and conclusions of the investigation. The ASTM RBCA Model <br /> will be used to evaluate the risk associated to humans from inhalation exposures to the <br /> hydrocarbons detected in groundwater. The report will include the results of this evaluation, a <br /> site map showing the location of monitoring well MW-1, a description of sam ling protocol, <br /> tabulated results from the soil and groundwater analyses, and a mass balance estimate of the <br /> remaining soil contamination at the gasoline tank <br /> As requested by the PHS/EHD, a mass balance of the contaminated soil remaining at the diesel <br /> tank and remote fill line that was previously investigated at the site will also be submitted in the <br /> report. <br /> SCHEDULE <br /> Because the Stockton Unified School District intends to solicit bids for conducting the site <br /> investigation, a schedule for completing the work cannot be provided at this time. However, <br />