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Tri-Valley Growers <br /> March 25, 1087 <br /> Page 2 of 10 Quote No. 6225G <br /> Exceltech and submitted to Tri-Valley Growers for your approval and <br /> submission to the County. The County will not allow work to proceed until <br /> all permits are approved and a County Release form has been signed by the <br /> Client. <br /> Task 2.2 ExplQratory Drilling <br /> The subsurface investigation will consist of drilling three exploratory <br /> borings to determine the horizontal extent of the unsaturated contamination. <br /> Soil samples will be collected and if field observations indicate <br /> contamination, the contaminated samples will be transferred to a State <br /> Certified laboratory for analysis. Groundwater monitoring wells will be <br /> constructed in each of the exploration borings The drilling of the borings <br /> will be conducted using a truck mounted drill rig and hollow stem auger. The <br /> auger and other tools used in the hole will be steam cleaned before use and <br /> between borings to minimize the possibilities of cross-contamination <br /> between borings Relative undisturbed soil samples will be collected at five <br /> (5) foot intervals using a modified California split tube sampler with <br /> internal brass liners. The boring will be advanced to the desired sampling <br /> depth and the modified California sampler will be lowered to the bottom of <br /> the hole. The sampler will then be advanced ahead of the auger using a 140 <br /> Ib. hammer. The sampler will then be removed from the hole and broken <br /> down into its component parts. The lowermost section of the sampler will <br /> be capped, labeled, logged on a chain of custody form and placed in an ace <br /> chest for transport to a State Certified laboratory. A log of the subsurface <br /> conditions encountered during the drilling process will be prepared by an <br /> Exceltech geologist in the field during the drilling process. Should <br /> contaminated soil be encountered during the drilling process the <br /> contaminated soil will be placed in drums (provided by the client or available <br /> at extra cost from Exceltech). It shall be the clients responsibility to <br /> properly dispose of any contaminated soils. Exceltech can assist the client <br /> in arranging for transportation and disposal on a time and material cost <br /> basis. <br />