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1 <br />' ADDENDUM TO WORKPLAN DATED NOV. 1 , 1991 <br /> DRILLING & SAMPLING BOREHOLES <br /> 6215 TAM O 'SHANTER DRIVE <br />' STOCKTON* CA (SITE CODE 1259) <br /> July 1 , 1992 <br />' PURPOSE OF THIS ADDENDUM: The November 1991 workplan proposed to <br /> drill , log , & sample 6, 35 ' deep auger hales -- 3 on Normac property <br /> & 3 on the Hammertown adjacent to the west; (refer to Plate I ) <br />' BRIEF REVIEW OF WORK DONE: After approval by the County EHD, work <br /> began on April E3, 1992, using Spectrum Exploration drilling <br /> equipment under the supervision of D. R. Allen, RO, of Wm. J. Hunter <br />' & Associates. Operations were performed according to the workplan, <br /> beginning on the Normac site with Borehole NBH #3. It was taken to <br /> 36.5 ' with soil samples taken at 15 ' , 20' , 25' , 30 ' , & 35 ' . Refer <br />' to Figure I for details of soil types and sample depths. <br /> The rig then moved to Borehole NBH #11 which was also taken to <br /> N 36.5 , and sampled at the same depths as #3; (refer to Figure 2 for <br /> details. ) Operations were discontinued for the night; the preserved <br /> soil samples were thoroughly re-iced and stored overnight. <br /> On April 9, operations recommenced at location NBH #2; it was taken <br /> to 36.5 ' , and sampled at 5 feet intervals from 15 ' to bottom; Figure <br /> 3 shows soil types and sample locations. <br /> iThe drilling rig and equipment were then moved to the adjacent <br /> Hammertown property, and located at Borehole HBH #1 as shown on <br /> Plate II This hole was advanced to 36. 5 ' with soil samples taken as <br /> shown an Figure 4. <br /> The rig was then spatted at location HBH #3; the hole was taken to <br /> 36.5 , with samples at 5 ' intervals from 15 ' to bottom; refer to <br /> Figure 5 for details. <br />' No odors or other evidence of contamination was noted in any of the <br /> 5 boreholes described above. <br /> The final borehole, HBH #2, was also drilled to 36. 5 ' with soil <br />' samples taken at 15' , 20' , 25 ' , 30 ' , & 35 ' ; (refer to Figure 6 for <br /> details. ) A petroleum hydrocarbon odor was noted in a 6" thick <br /> silty, sticky blue clay at 25 feet. This appears to be correlative <br /> with the blue clay encountered in Borehole B-5 which was drilled in <br /> Octaber , 1990. Laboratory analysis of that sample (Exhibit E, ) <br /> revealed the presence of a small amount of Benzene_ The sample <br />' 1 <br />