Laserfiche WebLink
Mike Pitta <br /> Page 7 <br /> April 27,2004 <br /> CH2M HILL will review a draft version of these interpretive materials and provide <br /> comments to SECOR. <br /> CH2M HILL will prepare a draft of the quarterly and serniannual groundwater monitoring <br /> reports for review by KMEP and a final report incorporating any comments by KMEP for <br /> submission to the RWQCB. <br /> This scope of work does not include preparation of the bioremediation pilot study interum <br /> evaluation report due to the RWQCB by April 1,2005 as required in the RWQCB's <br /> January 30,2004 letter. This work will be included in a subsequent work directive. <br /> Task 3—Abandon Wells M-9, N-6,and RW-2 <br /> As required in Revised MRP No. R5-2004-0803,CH2M HILL will abandon Wells M-9,N-6, <br /> and RW-2. Monitoring wells M-9 and N-6 are to be abandoned because they have <br /> consistently been dry for the past several years of grouridwater monitoring. RW-2 is being <br /> abandoned because it is completed in clayey sediments which are too low in permeability <br /> for effective groundwater extraction. These three wells are completed as follows according <br /> to well completion diagrams and conversation with Bill Morrison: <br /> Well Casin Diameter Depth <br /> M-9 PVC 4 inch 17 feet <br /> N-6 PVC 2 inch 16 feet <br /> RW-2 PVC 6 inch 35 feet <br /> Permits will be obtained from San Joaquin County prior to commencement of work. <br /> However, the County will require a letter form the oversight agency(RWQCB) approving <br /> the well abandonment work. The RWQCB has indicated no other work plan documents <br /> will be required. The wells will be abandoned in accordance with State and County <br /> requirements. Abandonment will include the following work using hollow stem auger <br /> drilling methods: <br /> • Removing the subsurface completions <br /> • Drilling out the subsurface materials <br /> • Grouting the boreholes to surface <br /> • Placing drilled out materials into drums for subsequent disposal <br /> • Collecting samples of the drummed materials for laboratory analysis for disposal <br /> A CH2M HILL hydrogeologist will procure the County pemnit,oversee the abandonment <br /> work, and prepare a brief well abandonment memorandum to document the work. A draft <br /> of the well abandonment memorandum will be prepared for review by KMEP and a final <br /> memorandum incorporating any comments by KMEP will then be prepared for submittal to <br /> San Joaquin County and the RWQCB. CH2M HILL will update the current site health and <br />