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One Market Plaza <br /> Spear Street Tower,Suite 717 <br /> San Francisco,CA 94105 <br /> (415)957-9557 GEOMATRIX <br /> 2 January 1991 <br /> rim <br /> 47 <br /> Y . . <br /> Ms. Eleanor Ratliff JAN Q 8 4" � <br /> San Joaquin County Department of Environmental Health <br /> P.O. Box 2009 ENViRON(ViENTAL HPIALIJi <br /> Stockton, California 95201 PERCViiT/SC cViurs <br /> Subject: Soil Boring Program <br /> 2941 Navy Drive <br /> Stockton, California <br /> Dear Ms. Ratliff: <br /> As requested by you in our telephone conversation this afternoon, we are submitting <br /> additional information regarding the soil boring program planned at the ST Services <br /> Stockton Terminal located at 2941 Navy Drive in Stockton. The purpose of the program is <br /> to assess the distribution of diesel in soil near a valve that recently leaked at the site. Soil <br /> borings will be drilled to intercept the groundwater table which is expected to be at 15 feet. <br /> Spectrum Drilling is scheduled for one day of drilling. We anticipate that 5 to 6 borings to <br /> 15 feet can be drilled in a day. The borings will be drilled using a drill rig outfitted with <br /> 6.5" hollow stem augers. All downhole equipment(i.e. augers,rods, samplers) will be <br /> steam-cleaned,pressure washed or washed in an Alconox-water solution before drilling <br /> and sampling each boring. <br /> The soil will be sampled continuously for lithologic description using a 5-foot-long split <br /> spoon core barrel. Soil samples will be collected in plastic bags at approximate 2 foot <br /> intervals for analysis by thin layer chromatography (TLC) in our Oakland laboratory. <br /> Additional samples will be collected at the same intervals in clean,4-inch long brass tubes, <br /> that will be sealed at the ends with aluminum foil and plastic endcaps. All samples will be <br /> labeled and stored in an ice-cooled chest until delivery to our laboratory. The samples will <br /> be stored in a refrigerator at our laboratory until they are analyzed by TLC or are sent under <br /> Geomatrix chain-of-custody proceedures to a state-certified analytical laboratory. The <br /> number of confirmation samples analyzed by a state-certified laboratory will be decided <br /> once the TLC results are complete. <br /> If water is encountered, the boreholes will be backfilled with hole-plug, a substance <br /> consisting primarily of bentonite. If water is not encountered, the holes will be backfilled <br /> with cement grout. <br /> Drill cuttings will be stockpiled on site on plastic sheeting. <br /> Three copies of the permit application form, three copies of a site map showing the <br /> locations of the proposed borings, an authorization to release form and the permit <br /> Geomatrix Consultants, Inc. <br /> Consulting Engineers and Earth Scientists <br />