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December 11, 1991 <br /> Beacon Service Station No. 492, Manteca, California <br /> Drilling Procedures <br /> Before drillin?,we will acquire a permit from the SJCPHS-EHD for drilling one soil boring. <br /> RESNA will contact Underground Service Alert at least 48 hours before drilling to delineate <br /> public utility lines at the site. Before drilling, we will hand a.iger each borehole to 3 to 5 <br /> feet below grade. <br /> We will observe a licensed well driller drill one 10-inch-diameter soil boring as shown on <br /> Plate 2. A truck-mounted rig equipped with hollow-stem augers will be used. The drilling <br /> will be performed under tl:e guidance of a field geologist. The earth materials will be <br /> identified using visual and manual methods, and classified according to the Unified Soil <br /> Classification System as drilling progresses. A PID will be used to evaluate soil satrapies for <br /> gasoline hydrocarbons. Field instruments such as the PID are useful for indicating relative y <br /> hydrocarbon vapors but do not detect the concentration of gasoline <br /> levels of gasoline <br /> hydrocarbons present with the same precision as laboratory analyses. Subjective evidence <br /> of gasoline hydrocarbons such as soil discoloration or obvious odor will be noted. <br /> _Co lletting_Soil Samples <br /> During drilling,soil samples will be collected at 5-foot or rther appropriate intervals using <br /> a California-modified,split-spoon sampler equipped with clean brass sleeves. Samples will <br /> be collected by drilling the boring to a point just above the sampling depth and then driving <br /> the sampler into the soil through the hollow center of the auger. The sampler will be dri'en <br /> 18 inches with a standard 1.40-pound hammer dropped 30 inches. The number of blows <br /> required to drive the sampler each successive 6-inch interval will be counted and recorded <br /> on the field boring log to give an indication of soil consistency. Soil samples will be <br /> collected, identified,and evaluated for relative levels of gasoline hydrocarbons using a PID <br /> when appropriate. <br /> 86102-7W - -. <br />