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Michael Infuma <br /> Page 2 <br /> October 1b,2001 <br /> 131420.A1.09 <br /> collected from this well may be used to assess if the plume is expanding,stable,or <br /> decreasing and to collect geochemical indicator data from within the plume to <br /> evaluate the potential for natural or enhanced degradation of contaminants. <br /> 0 MW-DIS-11D-This monitoring well will also be installed at the location of CPT-12. <br /> The purpose of well is to monitor the deeper water-bearing zone and assess whether <br /> vertical downward migration of the plume has occurred. <br /> • MW-DIS-12-This monitoring well will be installed at the location of CPT-20. <br /> MW-DIS-12 will act as a downgradient monitoring point on the leading edge of the <br /> plume. Data collected from this well may also be used to assess if the plume is <br /> expanding,stable, or decreasing and to collect geochemical indicator data from the <br /> edge of the plume to evaluate the potential for natural or enhanced degradation of <br /> contaminants. <br /> • MW-DIS-13-This monitoring well will be installed approximately 240 feet east of <br /> CPT-21,and will serve as the eastern cross-gradient monitoring point. Background <br /> geochemical indicator data may be collected from this point to help evaluate the <br /> potential for natural or enhanced degradation of contaminants. <br /> i <br /> • MW-DIS-14-This well will be installed at the location of CPT-24,and will serve as <br /> the western cross-gradient monitoring point. Background geochemical indicator <br /> data may be collected from this point to help evaluate the potential for natural or <br /> enhanced degradation of contaminants. <br /> Should you have any questions regarding these changes please do not hesitate to contact me <br /> at 510-251-2888 x2032. <br /> Sincerely, <br /> CH2M HILL <br /> I> <br /> Lucius Taylor/CH2M HILL <br /> Project Hydrogeologist <br /> SFO\Work_Plan_Addendum.doc <br /> c: Marty Hartzell/CVRWQCB <br /> Steve Erickson/Del Monte <br /> Rich Fish/Del Monte <br /> Keith Sheets/CH2M HILL <br />