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Kennedy/Jenks/Chilton <br /> Farm Supply. Analytical information from water samples collected will be pro- <br /> vided to Cal-Farm Supply when available for its use in determining proper <br /> waste disposal methods. <br /> Groundwater samples will then be collected using a clean Teflon bailer. Sam- <br /> ples will be collected in properly preserved sample bottles, sealed, labeled, <br /> and placed in an ice chest for transport to the laboratory for analysis. A <br /> chain-of-custody form will be completed concurrently with the collection of <br /> groundwater samples and will be included in the ice chest during shipping. <br /> Water samples will be analyzed as described in Task 5. <br /> Task 2 - Soil Boring Drilling and Sampling <br /> Two soil borings and two of the monitoring wells installed during Task 1 will <br /> be drilled near the locations of the underground storage tanks to be located <br /> in the warehouse storage yard (refer to Figure 1) . The actual tank locations <br /> will be inferred from features associated with the underground tank such as <br /> vent lines, fill lines, or the presence of a concrete slab. <br /> The exact location of the soil borings will be determined in the field. <br /> One tank is a 2,000 gallon diesel fuel tank which was installed in 1975 at the <br /> approximate location of a 1,000 gallon diesel fuel tank which was removed the <br /> same year. The size and contents of the second tank is unknown, however, it <br /> is reportedly located near the northeast loading ramp at the main building. <br /> Drilling and sampling procedures will follow those described under Task 1- <br /> Monitoring Well Installation and Sampling. <br /> Headspace analysis will also be performed in the field with a portable organic <br /> vapor analyzer to monitor soils for the presence of organic vapors. At the <br /> present time we have estimated a maximum boring depth of 20 feet. However, if <br /> headspace analysis indicates that organic vapors are present at this depth, <br /> sampling will continue at 5-foot intervals until organic headspace vapors are <br /> less than 10 ppm above background levels. <br /> After drilling and sampling have been completed, the boring will be immedi- <br /> ately backfilled with a cement/bentonite grout mixture. The grout mixture <br /> will be similar to that described under Task 1 - Monitoring Well Installation <br /> and Sampling. The grout will be emplaced through the augers to stabilize the <br /> boring walls. <br /> The excess soils generated during drilling will be collected and placed in DOT <br /> approved drums appropriate for the storage of hazardous waste. Handling and <br /> disposal procedures will follow those described for material generated during <br /> Task 1. <br /> Task 3 - Surface Soil Collection <br /> Shallow surface samples will be collected from a depth of 6 inches to 1 foot. <br /> These samples will be collected from the warehouse storage yard and from the <br /> perimeter of the facility. They are intended to provide an indication of pos- <br /> sible source areas for the nitrates reportedly detected in the water sample <br /> 4 <br />