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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 Borinss <br /> Up to eight soil borings will be drilled during this investigation The <br /> investigation will commence with drilling four soil bonngs 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/engmeer under the <br /> oversight of a Radian Registered Geologist The drilling will be accomplished with a truck- <br /> mounted drilling ng equipped with hollow-stem augers In areas of limited or difficult access, the <br /> borings may be drilled with a portable drilling ng <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 /> • <br /> Preliminary Site Investigation Work Plan-Draft June 30, 1998 <br /> Roberts Property(Former Vemalcs Pump Station) <br /> Vernalis,California <br /> 9 <br />