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one Mer Ket pleza <br />., Grab, Street 7nwe Sire 717 <br />San Frarcisco. CA 34125 <br />(4=5) g47.c557 <br />2 January 1991 <br />Ms. Eleanor Ratliff <br />San Joaquin Cowity Department of Environmental Health <br />P.O. Box 2009 <br />Stockton. California 95201 <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 planted 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 sod near a valve that recently leaked at die 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 outfirred with <br />0.5" hollow stern 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 />r*mat will be sealed at the ends with aluminum foil and plastic endeaps..kil samples will be <br />labeled and stored in an ice -cooled chest until delivery to our laboratory. The samples will <br />be shred in a refrigerator at our laboratory until they are analyzed by TLC or are sent under <br />Oeommaatrix chain-of-ctsrody proceedw'es to a state -certified analytical laboratory. The <br />number of conftnnation samples analyzed by a state -certified laboratory will be decided <br />once the TLC results are complete. <br />>f 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 cuttit:gs will be stockpiled on site on plastic sheeting. <br />Three conies of the permit application form, three copies of a site trap showing ,he <br />!c�anons of the proposed borings, an authorization um release form ;urd the pen -nit <br />Goometrix Conoultant6, Ino. <br />XIJid[J'J39 Wd40:t'0 ,C, 20 NHf <br />