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1 <br /> Appendix C <br /> ' Drilling and Sampling Procedures <br /> The procedures used for drilling the borings and collecting soil and groundwater samples are <br /> presented below. <br /> • Drilling permits were obtained from the San Joaquin County Environmental <br /> Health Department. <br /> ' • An encroachment permit was obtained from Caltrans District 10 for this project. <br /> ' Drilling and Soil Sampling Procedures <br /> • Three soil borings were advanced to a maximum depth of 8.5-meters <br /> (approximately 28 feet) using direct-push sampling equipment. <br /> • Two soil borings were advanced to a depth of 12.2 meters (approximately 40-feet) <br /> ' hallow stem auger drilling equipment. <br /> • Soil samples were collected from direct push borings using a 5-centimeter(2- <br /> inch) diameter sampler lined with a 1.3-meter(4-foot) long acetate sleeve. Ends <br /> were covered with Teflon film and capped with PVC end caps. <br /> • Soil samples from hallow stem auger(HSA)borings were collected in six-inch <br /> long, stainless steel or brass sample tubes inserted inside the samplers. Ends were <br /> covered with Teflon film and capped with PVC end caps. <br /> ' • The sample tubes were either pre-washed by the supplier or washed using a bristle <br /> brush with a detergent rinse followed by two clear water rinses and a final <br /> deionized/distilled water rinse. The sample tubes were dry before use. <br /> • The drilling and sampling equipment was washed in a detergent rinse, two clear <br /> water rinses, and a final deionized/distilled water rinse prior to drilling. The <br /> equipment was dry air dried or dried using paper towels. <br /> • Borings were backfilled with bentonite cement grout from the bottom of the <br /> borehole to ground surface. <br /> • Soil and wastewater generated during the field activities was contained in <br /> ' 208-liter(55-gallon) United Nations approved drums. <br /> Groundwater Sampling Procedures <br /> • Groundwater samples were collected from a well casing inserted into each HSA <br /> boring. The well casing consisted of 2.5-centimeter(1-inch) diameter, Schedule <br /> 40, flush-threaded, 0.05-centimeter(0.020-inch), machine-slotted polyvinyl <br /> S=DP-M.�fpNrojec MM3476DveMo RIWSl.dx <br /> ]/1"2 <br />