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MAY 21 '90 12:E7 AGI BF "`VUE P.9/4 <br /> Ms. Eleanor Ratliff" � � Applied Geotechnology Inc. <br /> San Joaquin Local Health District <br /> May 21, 1990 <br /> Page 2 <br /> The grout pipe method of well abandonment will be used, as follows: <br /> o The existing well casing ox drive point will be overdrilled with a dill <br /> rig equipped with continuoijs flight hollow stem auger, and extracted <br /> from the borehole. <br /> c The borehole will then be filled by tremmie methods with 9-suck neat <br /> cement with less than 5 percent bentonite as the hollow stem auger- cas- <br /> ing is being withdrawn. Care will be Taken to keep the discharge end of <br /> the tremmie pipe submerged in the grout to avoid breaking the seal while <br /> filling the annular space. <br /> We trust this information will expedite the permit process. <br /> Sincerely, <br /> APPLIED G HNOLOGY C <br /> Vincent L scko, P. . <br /> Associate Engineer <br /> RPR/VPI,/cgl <br /> enclosure <br /> cc: Mr. Stan 9leksy; USG Corporation <br />