Laserfiche WebLink
_r IleBrown and Caldwell <br /> Consuitanis <br /> r. 723 S Street , <br /> t <br /> Sacramento <br /> California 95814-7092 <br /> !916)414-0123 <br /> FAX(1916)444-8437 <br /> i <br /> 4 <br /> Y <br /> July 27, 1993 <br /> Mr. Bob Fratto <br /> Sheldon Oil Company "II <br /> 426 Main Street J <br /> Suisun, California 94585 017-7603-0111 <br /> Subject: Borehole Drilling, Sheldon Oil Company <br /> Stockton, California <br /> Dear Mr. Fratto: <br /> Sheldon Oil Company (Sheldon) authorized Brown and Caldwell (BC) to drill exploratory <br /> t 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 <br /> hydrocarbons in soil beneath the site. Petroleum hydrocarbons were found in soil beneath the <br /> site during recent excavation activities. # <br /> Presented below are discussions on field events at the site, site geology and hydrogeology, <br /> analytical results, and conclusions. I <br /> FIELD EVENTS <br /> - I <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 /> were drilled by Wayne Drilling of Lincoln, California, and two were drilled by Spectrum <br /> Drilling of Stockton. Both companies used truck-mounted hollow-stem auger drilling rigs i <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 /> attached as Appendix A. <br /> 76UMRRES PA7603-01.(111 <br />