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GEOSYNmc CONSULTANTS <br /> Mr. Tanhum Goldshmid <br /> 9 February 2004 <br /> Page 2 <br /> Prior to redevelopment, GeoSyntec ' s field technician will surged each well using a <br /> surge-block (i . e. , a device for cleaning the inside of the well and flushing water in and out <br /> of the filter pack) . The purpose of the surge block is to loosen particles, which may be <br /> adhered to the inside of the well casing. The surge block will also force groundwater in <br /> and out of the well screen and filter pack to increase conductivity between the well, filter <br /> pack, and aquifer. Following surging, GeoSyntec ' s field personnel will redevelop each <br /> groundwater monitoring well using a 2-in. centrifugal pump (or equivalent) . <br /> Approximately 10 to 15 well volumes will be pumped from each well to remove <br /> suspended particles from the water column. During redevelopment, GeoSyntec will <br /> monitor flow rate, pumping time, and water quality parameters (i . e. , temperature, pH, and <br /> turbidity) . Each well will be pumped until the field parameters have stabilized. <br /> GeoSyntec has assumed that field parameters will stabilize within one hour. If field <br /> parameters have not stabilized within one hour, IRC will be contacted to discuss potential <br /> strategies. Field forms documenting the redevelopment activities will be prepared. <br /> GeoSyntec will also record the physical condition of each well, including damage or <br /> repairs that may be required. In anticipation of the need to replace some of the monitoring <br /> well caps, GeoSyntec will also provide 20 new locking well caps. Monitoring well caps <br /> not used will be provided to IRC for future use. <br /> Reporting <br /> The results of the well development activities will be summarized in a letter report that <br /> will include a summary of the field work, applicable field notes and observations, and a list <br /> of recommendations, if any. <br /> SCHEDULE <br /> GeoSyntec understands IRC ' s desired to complete the well redevelopment activities <br /> by the end of February; therefore, GeoSyntec is proposing to utilize two one-man crews <br /> and anticipates it will take four and a half days to complete the project. We are prepared to <br /> begin implementation of the field activities on 23 February 2004 . <br /> XR04025/Well-Development.DOC <br /> 40 RECYCLED AND RECYCLABLE <br /> r <br />