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• <br /> ADDENDUM TO WORKPLAN DATED NOV. 1 , 1991 <br /> DRILLING & SAMPLING BOREHOLES <br /> 6215 TAM O 'SHANTER DRIVE <br /> STOCKTON, CA (SITE CODE 1258) <br /> July 1 , 1992 <br /> PURPOSE OF THIS ADDENDUM. The November 1991 workplan proposed to <br /> drill , log, & sample 6, 35 ' deep auger holes -- 3 on Normac property <br /> & 3 on the Hammertown adjacent to the west; (refer to Plate 1 ) <br /> BRIEF REVIEW OF WORK DONE: After approval by the County EHD, work <br /> began on April B, 1992, using Spectrum Exploration drilling <br /> equipment under the supervision of D. R. Alien , RG, of Wm. J. Hunter <br /> & Associates. Operations were performed according to the workplan , <br /> beginning on the Normac site with borehole NDH #3. It was taken to <br /> 76. 5 with soil samples taken at 15 , 20 , 25 , 30 , of =5 Refer <br /> to Figure 1 for details of soil types and sample depths. <br /> The rig then moved to Borehole NEH #1 , which was also taken to <br /> . 36. 5 , and sampled at the same aepths as #3; (refer to Figure 2 for <br /> details. ) Operations were discontinued for the night; the preserved <br /> sail 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 f ream 15 to bottom; Figure <br /> 3 shows soil types and sample locations. <br /> The 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 on Figure 4. <br /> The rig was then spotted 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 o for <br /> details. ) A petroleum hvdrocarbon odor was notes 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 /> October , 1990. Laboratory analysis of that sample (Exhibit E, ) <br /> revealed the presence of a small amount of Benzene. The sample <br /> 1 <br />