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Former 76 Station 4409 S E C ® R <br /> January 27, 2006 <br /> Page 6 <br /> r <br /> WASTE DISPOSAL <br /> The disposal of purged groundwater generated during the quarterly groundwater monitoring <br /> event is documented in TRC's Quarterly Monitoring Report, October through December <br /> 2005, dated October 27, 2005 (Attachment 1) r <br /> r <br /> THIS QUARTER ACTIVITIES (Fourth Quarter 2005) <br /> 1 TRC performed groundwater monitoring and sampling event �u <br /> 2 SECOR prepared and submitted quarterly summary report <br /> F <br /> 3 SECOR requested extension for review of work plan, dated November 21, 2005, via e- <br /> mail to allow time for redevelopment of MW-17 to verify C monitoring zone <br /> concentrations <br /> NEXT QUARTER ACTIVITIES (First Quarter 2006) <br /> 1 TRC to perform groundwater monitoring and sampling event <br /> 2 SECOR to prepare and submit a work plan for additional site assessment for vertical <br /> delineation <br /> 4 <br /> 3 SECOR to prepare and submit a quarterly summary report <br /> 4 SECOR to redevelop MW-17 by Air Lift methods <br /> RECOMMENDATIONS <br /> SECOR recommends MW-17 to be redeveloped using Air Lift methods to determine validity <br /> of reported concentrations and to verify that cross contamination did not occur during the <br /> installation of MW-17 After redevelopment, monitoring and sampling should continue at <br /> least 2 consecutive quarters prior to facilitating additional work at the site Joint monitoring x a, <br /> and sampling with the upgradient ARCO station will continue to allow generation of regional <br /> groundwater flow and chemical isoconcentration maps <br /> LIMITATIONS <br /> 3 <br /> This report presents our understanding of existing conditions at the subject site The <br /> conclusions contained herein are based on the analytical results, and professional <br /> judgment in accordance with current standards of professional practice, no other warranty `kx <br /> is expressed or implied SECOR assumes no responsibility for exploratory borings or data k <br /> reported by other consultants or contractors <br /> i <br /> 4409 4Q2005 QSR(CR)doc SECOR lntemawnal Incorporated <br /> ye <br />