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Brown and Caldwell F <br /> , � <br /> C� r�. ,JuiiCniJ <br /> - b122 <br /> 1 <br /> ii <br /> July 27, 1993 <br /> ' k <br /> f <br /> Mr. Bob Fratto <br /> € Sheldon Oil Company <br /> 426 Main Street <br /> Suisun, California 94585 017-7603-01/1 1 <br /> k <br /> Subject: . Borehole Drilling, Sheldon Oil Company <br /> Stockton, California <br /> !I <br /> Dear Mr. Fratto: <br /> Sheldon Oil Company (Sheldon) authorized Brown and Caldwell (BC) to drill exploratory <br /> boreholes at the Sheldon Stockton facility located at Miner Street and Highway 99, Stockton, <br /> California (site). All necessary permits and permission were obtained from the County. <br /> The objective of this work was to define the lateral and vertical extent of petroleum f <br /> hydrocarbons in soil beneath the site. Petroleum hydrocarbons were found in soil beneath the <br /> site during recent excavation activities. y <br /> Presented below are discussions on field events at the site, site geology and hydrogeology, <br /> analytical results, and conclusions. <br /> FIELD EVENTS <br /> f <br /> Drilling and Sampling <br /> Between the dates of May 11 and 14, 1993, BC personnel supervised the drilling and <br /> sampling of five soil borings (TW 1 - TW4, and SB 10). The borehole locations are shown on ; <br /> Figure 1. After the first borehole was drilled, it became apparent that 14 boreholes would not <br /> (' be needed and that it would take longer and cost more than had been allocated. Three wells <br /> f were drilled by Wayne Drilling of Lincoln, California, and two were drilled by Spectrum <br /> A Drilling of Stockton. Both companies used truck-mounted hollow-stem auger drilling rigs <br /> equipped with 6- and 8-inch diameter bits and drill stems. Cuttings generated during the <br /> drilling were transported and added to an adjacent biocell. The complete borehole logs are <br /> h <br /> ; <br /> attached as Appendix A. <br /> 7603�CO RRES P J603-0 9.L-1 <br /> . l <br /> _J <br />