Laserfiche WebLink
• <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 I ) <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. Allen, RG, 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 1 for details of soil types and sample depths_ <br /> The rig then moved to Borehole NBH #1 , which was also taken to <br /> • <br /> 76. 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 #L; 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 /> The drilling rag 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 3o. 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 6 for <br /> details. ) A petroleum hydrocarbon odor was noted in a b" 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 />