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Appendix B <br /> EXPLORATORY BOREHOLE, <br /> SOIL SAMPLING, <br /> DECONTAMINATION AND QUALITY ASSURANCE PROCEDURES, <br /> MONITORING WELL INSTALLATION, <br /> WELL DEVELOPMENT PROCEDURES AND <br /> GROUNDWATER SAMPLING PROCEUDRES <br /> EXPLORATORY BORING <br />' Before exploratory boreholes were drilled, a number of actions were performed drilling <br /> permits were obtained, and an underground utility-locating service were contracted to clear <br />' subsurface utilities for the proposed boreholes in addition, Underground Service Alert <br /> (USA) was contacted to schedule public and private utility companies to mark their respective <br /> subsurface improvements <br /> Field personnel began drilling by excavating the first four feet of soil with a hand auger to <br /> ensure that there were no subsurface obstructions Exploratory boreholes, to be completed as <br /> 2-inch-diameter monitoring wells, were drilled with 8-inch outer-diameter (OD) hollow-stem <br /> augers (HSA) Boreholes to be completed as 4-inch diameter wells were drilled with 10-inch <br /> HSA's The augers were steam cleaned before each borehole was drilled <br /> 1 <br /> SOIL SAMPLING <br /> Soil samples were collected while drilling to evaluate the geochenustry and stratigraphy of the <br />' soil at the borehole location The soil was sampled by driving an 18-inch-long modified- <br /> California split-spoon sampler fitted with 2-inch-diameter liners beyond the tip of the auger <br />' into undisturbed soil The split-spoon sampler was driven into the soil with a 140-pound <br /> hammer As the sampler was driven into the soil, blow counts were recorded for each 6 <br /> inches of penetration The blows were recorded on the borehole logs Samples were <br /> collected every S or 10 feet, depending on the lithology encountered Soil samples were <br /> classified and logged according to the Unified Soil Classification System The work was <br /> supervised by a California State registered geologist to ensure that it met regulatory standards <br /> Each soil sample was sealed inside the liner with TeflonTM tape and polypropylene end caps, <br /> and wrapped with duct tape The soil samples were labeled, and stored in an iced cooler for <br /> I04/18/94/1213821125997/DRILDONE DOC <br /> I <br />