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Mr. Robert Vieira • • Project 0805-117.01 <br /> October 3, 1994 <br /> Page 2 <br /> completed. We will contact you to coordinate drilling operations to determine which day <br /> of the week is most convenient. Our tentative schedule for the construction of the vapor <br /> extraction wells is December 1994. Upon receipt of your authorization, we will schedule <br /> a date for our work and we will inform you of that date. <br /> Depending on the findings of this phase of the investigation, we may have to connect the <br /> wells to a remediation system. The vapor extraction wells would be used to remove <br /> hydrocarbons from soil by placing a vacuum on the well and drawing the hydrocarbon <br /> vapors through a pipeline to a remediation unit to be located on the ARCO site. To <br /> connect the wells to a remediation unit at the ARCO station will require EMCON and its <br /> contractors to lay horizontal pipeline from the wells to the station. A schematic of the <br /> piping design is shown on Figure 3. This work would take approximately 1 week to <br /> complete. If the wells are connected to a remediation unit, a technician from EMCON <br /> would periodically need to gain access to the wells for data acquisition and maintenance <br /> for approximately 1 year, or as required until remediation is completed. After the soil is <br /> remediated and the wells are no longer needed, the wells will be properly destroyed by <br /> drilling them out with a 10-to 12-inch-diameter auger and backfilling the borehole with <br /> neat cement. The ground surface will then be restored to resemble the surrounding ground <br /> material. A boring will be drilled adjacent to each well to collect soil samples to confirm <br /> that hydrocarbons have been removed from the soil; the borings will be backfilled with <br /> neat cement. <br /> We appreciate your cooperation in this matter. Please sign and return both copies to our <br /> office. We will forward both copies to ARCO. ARCO will then sign both copies and will <br /> return one copy to you for your files. Upon your authorization to access your property, <br /> we will arrange a time to perform the work and appraise you of the schedule. <br /> Please feel free to call Jay R. Johnson if you have any questions about the work. <br /> Sincerely, <br /> EMCON Associates <br /> Q <br /> t ' <br /> om <br /> Claudio Avila *.. ohnsonProject Geologist rvisor <br /> Attachments: Figure 1 Area Site Plan <br /> Figure 2 Schematic Well Design <br /> Figure 3 Cross-section of Vapor Extraction System Trench <br /> ARCO Products Company License Agreement (two copies) <br /> cc: Chuck Carmel, ARCO Products Company <br /> Margaret Lagorio, San Joaquin County Public Health Services <br /> S AC/pj0N080S08051090.1 d1-94 lfc:2 <br />