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[ r <br /> . n <br /> r <br /> GOLDEN GRAIN COMPANY <br /> December 21, 1989 <br /> - 202/799-5045.06 <br /> The results of the SVS (see section 4.1) were used to select <br /> locations for the additional monitoring wells. A tabulated <br /> summary of the collected data, along with a report from the <br /> geochemist, is presented in Appendix II. <br /> 3.3 MONITORING WELL INSTALLATION <br /> 3.3.1 Drilling Methods <br /> From November 7 to 12, 1989, as proposed in the revised work <br /> P an additional six soil borings were drilled at the site to <br /> ; ydrocarbons in the soil and to install <br /> verify the extent of <br /> re 3) . The borings were completed to a <br /> monitoring wells (Figu <br /> depth of 50 feet with a truck--mounted drill rig using 8.0-inch <br /> hollow-stem augers. A proposed deeper <br /> outside diameter (O.D.) Ovide <br /> (75-foot) well that was to be installed next to MWwas not-13 (top- <br /> information on any verticalnater gr <br /> 2wfeet thidckswas encountered at <br /> drilled. A clay layer at least <br /> i <br /> 48 feet below grade in MW-13; since the hydrocarbon concen- <br /> trations in groundwater at that location were unknown at that <br /> time, it was decided not to drill the deeper well to avoid <br /> potential cross-contamination into a possible lower aquifer. <br /> Soil samples were obtained at approximately 5-foot intervals <br /> above the water table. (See Appendix III for accurate details of <br /> sample lccations.) The drilling was supervised by a GTI geolo- <br /> gist, working under the direction of a California registered <br /> geologist. The field geologist maintained a constant log of the <br /> materials encountered (Appendix III) . The soil from the borings <br /> was sealed in DOT-approved 55-gallon steel drums and left on site <br /> for disposal at a later date (pending laboratory results) . <br /> GROUNDW ATEft <br /> UcIINOLOGY.INC. <br />