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APPENDIX A <br /> EXPLORATORY BORING AND WELL INSTALLATION PROCEDURES <br /> Drilling Methods <br /> Before drilling begins, we will contract with an underground utility clearance contractor <br /> to clear the drill sites of buried obstacles. IT will also notify the Port of Stockton <br /> Facilities Group and Underground Service Alert of our intent to drill so that approximate <br /> locations of underground utility lines and structures can be marked. The soil borings <br /> will be started by hand auguring to a depth of 5 feet to minimize the possibility of <br /> damaging underground utilities. The Wrings will be drilled with an air rotary casing <br /> hammer drill rig equipped with 10 to 12-inch outside-diameter, heavy-walled downhole <br /> casing. Soil samples for logging wi I be obtained from return materials and by <br /> advancing a modified California split-sOoon sampler equipped with brass or stainless <br /> steel liners into undisturbed soil beyond the tip of the auger. Soils will be logged by an <br /> IT geologist according to the Unified Soil Classification System and standard geological <br /> techniques. <br /> The soil sampling equipment will be cleaned with a detergent water solution, rinsed with <br /> clean water, and equipped with clean liners between sampling intervals. The drill string, <br /> bits, and samplers will be steam cleaned between each boring to reduce the possibility of <br /> cross contamination. Steam cleaning effluent will be contained in 55-gallon drums or <br /> temporary tanks and temporarily stored on site. IT will work with the STTC to arrange <br /> for disposal of the effluent. <br /> Soil Sampling in Borings <br /> Soil samples will be collected from soil cuttings as drilling proceeds. Soil samples will <br /> be collected by advancing the boring to a point just above the sampling depth, and then <br /> driving a California-modified, split-spoon sampler containing clean brass or stainless <br /> steel sleeves through the hollow center of the auger into the soil. The sampler will be <br /> driven 18 inches with a standard 140-pound hammer repeatedly dropped 30 inches. The <br /> number of blows needed to drive the sampler each successive 6 inches will be counted <br /> and recorded to evaluate the relative consistency of the soil. Sampling equipment will be <br /> cleaned between each use with an industrial soap and potable water. <br /> CAMy DocumentsTrojectsTort of Stockton\Well Install\workplan.doc <br /> B-1 Rev.0,4/9 <br />