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2 2 1 Soil Sampling <br /> Undisturbed soil samples will be collected from each sample location at five foot intervals until <br /> the vertical extent of Impacted soil is defined by field observation and screening Soil samples <br /> will be collected by driving the GeoprobeT"' sampler to the desired depth, retracting the piston tip <br /> into a sample tube lined with a one-Inch diameter acetate sleeve and driving an additional two <br /> feet to displace the soil sample into the sleeve The sod sample will then be extracted from the <br /> borehole to the surface using the GeoprobeTm rig Two soil borings (SB-1 and SB-3) will be <br /> continuously cored using the GeoprobeTA° MacroCore® system The two-inch diameter <br /> continuous cores and all soil samples will be logged for hydrogeologic and lithologic <br /> characteristics by an experienced field geologist and screened using an organic vapor monitor <br /> equipped with a photoionization detector <br /> ' 2 2 2 Groundwater Grab Sampling <br /> At the top of the groundwater-bearing zone In each of the sample locations, a plash driven <br /> groundwater sampling device consisting of a steel Inner core well screen nested inside a steel <br /> outer sampler sheath will be advanced an additional two feet into the formation When the <br /> desired depth is reached, the sampler will be pulled up approximately four feet to expose the <br /> open borehole to the inner core well screen From this temporary well, a groundwater grab <br /> sample will be collected by lowering a polyethylene tubing and check valve system down the <br /> hollow center of the drilling rod and into the groundwater column Groundwater will be pumped <br /> to the surface using an oscillating motion <br /> 2 2 3 Borehole Abandonment <br /> Each of the GeoprobeT"^ sod boringswill be an ned with hydrated bentonite From the <br /> surface, bentonite chips will be placed into the en orehole and hydrated with clean water <br /> Following borehole abandonment, asphalt p the ►VIII be used to match the surface pavement <br /> 2 2 4 Laboratory Analyses of Geoprobe Samples <br /> All soil and groundwater grab samples will be contained, labeled, packaged and stored In an <br /> iced cooler for transport under chain-of-custody manifest to NEI/GTEL Environmental <br /> Laboratories, Inc (NEI/GTEL) a state of California Department of Health Services certified <br /> analytical laboratory (#1845) <br /> ' Work Plan Environmental Site Investigation Ramage Environmental <br /> • 191 South Moffat Blvd Manteca California June 18, 1997 <br />