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Underground Services Alert (USA) will be contacted at least 48 hours prior to any subsurface <br /> exploration. If underground utilities are present directly underneath or within a few feet of the <br /> boring/well locations,then the boring and/or well locations will be shifted. <br /> 4.3 Soil Borings <br /> Up to eight soil borings will be drilled during this investigation. The <br /> investigation will commence with drilling four soil borings around the known area of impacted <br /> soils (where previous borings were drilled), as shown in Figure 3. The borings will be drilled to <br /> a depth of about 30 feet or to the water table, whichever is encountered first. Four additional soil <br /> borings may be drilled, depending on the analytical results from the first four soil borings. <br /> Drilling operations will be supervised by a field geologist/engineer under the <br /> oversight of a Radian Registered Geologist. The drilling will be accomplished with a truck- <br /> mounted drilling rig equipped with hollow-stem augers. In areas of limited or difficult access, the <br /> borings may be drilled with a portable drilling rig. <br /> The soil borings will be continuously sampled for lithologic and field-screening <br /> purposes and to obtain discrete samples for analyses. Soil samples will be obtained at five-foot <br /> intervals between the depths of 5 and 30 feet below ground surface. However, soil samples will <br /> not be obtained below the water table. <br /> The soil samples will be obtained using a California split-spoon sampler. Soil <br /> samples will be collected in either stainless steel sleeves or brass sleeves lining the inside of the <br /> split-spoon sampler. Samples will be retained from either the lower or the middle sleeve of the <br /> sample drive interval. Samples from immediately above or below the soil sample selected for <br /> laboratory analysis will be retained for field screening and for lithologic logging. Field screening <br /> will consist of examining the soil samples for visual (discoloration) and olfactory (odor) evidence <br /> of petroleum hydrocarbons and performing headspace testing. The headspace tests will be <br /> Preliminary Site Investigation Work Plan-Final July 9,1998 <br /> Roberts Property(Former Vernalis Pump Station) <br /> Vernalis,California <br /> 9 <br />