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Geosyntec'� <br /> consultants <br /> Identification of each sampling location was guided by the GPS. The coordinates were <br /> recorded in latitude and longitude in decimal degrees, to five decimal places. Positions <br /> are relative to the California State Plane III Coordinates,North; North American Datum <br /> 1983. Drilling locations were marked with white paint. <br /> 3.2.2 Utility Clearance <br /> Geosyntec marked drilling locations with white paint. Geosyntec will contact <br /> Underground Service Alert of Northern California a minimum of 48 hours prior to <br /> beginning intrusive subsurface activities. Geosyntec contracted with a private utility <br /> locator to perform a geophysical survey near each proposed boring location to identify <br /> and mark utilities,pipelines, or other subsurface obstructions that may be present. <br /> 3.2.3 Drilling and Logging <br /> The proposed soil sampling locations will be drilled by the drilling contractor to an <br /> approximate depth of 4 feet bgs to ensure clearance of underground utilities. An <br /> undisturbed core sample will be then collected at target sampling depth in a 6-inch-long <br /> brass or stainless-steel tube using a hand-auger equipped with a slide hammer. A <br /> split-spoon sampler will be fitted with brass or stainless-steel tubes and the sampler will <br /> be driven into the soil using a slide hammer. The sampler will be retrieved and the <br /> undisturbed brass or stainless-steel tubes exposed. <br /> A new brass or stainless-steel sleeve will be used for each sampling station. <br /> The following steps will be conducted for each soil boring: <br /> • Samples will be photographed, with respective boring identification and sample <br /> location markers visible in the photographs. <br /> • Soil cuttings and soil cores will be visually logged by Geosyntec field personnel <br /> under the direction of a California-licensed geologist for classification of soil type <br /> using the Unified Soil Classification System (USCS) as guidance and field <br /> screened for volatile organic compounds(VOCs)using a photoionization detector <br /> (PID). <br /> • The following information, at a minimum, will be logged by the field geologist: <br /> o Sample depth; <br /> 20190122- FINAL UST Data Gap Work Plan 7 22.01.2019 <br />