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for Sand A (MW-14A)and Sand B (MW-14B). This well will be used to <br /> j define the eastern edge of the plume in the downgradient direction for <br /> Sand A. Sand B will also be targeted to determine if there is any vertical <br /> migration of contaminants in this area. The extent of impact in Sand B has 0 <br /> not been fully characterized throughout the site and this data will help to <br /> determine the extent to which Sand B has been impacted. The wells will <br /> be separated into separate well constructions to avoid cross contamination <br /> between Sand A and Sand B in the event that Sand B is determined to <br /> have no impact. <br /> o One groundwater monitoring well (MW-15) will be located to the <br /> northwest of MWO-3. This well will be used to define the northern extent A- <br /> ? <br /> of the plume. The 4`h Quarter 2006 groundwater monitoring results 15 <br /> indicate that groundwater flow has shifted to a northwesterly direction at a r /-T 7 <br /> gradient of 0.002 in the vicinity of MWO-3. Since the northeast extent of Put <br /> the plume has been identified in Sand,A with non-detectable results in � <br /> MWO-1,the northern extent of the plume should also be addressed. MW- b <br /> 15 will provide this valuable data. MW-15 will be installed as a well <br /> cluster with a separate well construction for Sand A (MW-15A) and Sand <br /> B (MW-1513). Sand B will be targeted to determine if there is any vertical ms`s <br /> migration of contaminants in this area. The extent of impact in Sand B 0 <br /> has,not been fully characterized throughout the site and this data will help 30- y <br /> to determine the extent to which Sand B has been impacted. The wells P111 cr, 7 <br /> will be separated into separate well constructions to avoid cross <br /> contamination between Sand A and Sand B in the event that Sand B is <br /> determined to have no impact. <br /> o If laboratory analysis of the grab groundwater sample collected early on <br /> from MW-15 indicates MTBE impact in this northern well,then the extent <br /> of the plume will not have been identified in the northern direction. Well <br /> MW-16 will then be installed along J Street,just east of South Harlan <br /> Road to further define the extent of the MTBE plume in this direction. If <br /> groundwater concentrations of MTBE are not detected in MW-15, then <br /> MW-16 will not be installed. <br /> o If laboratory analysis of the grab groundwater sample collected early on <br /> from MW-13 indicates MTBE impact in Sand A,then the western extent <br /> of the plume will not have been identified in the western direction. Since <br /> groundwater flow has varied from a northeast direction during previous <br /> quarterly gauging events to a western and northwestern direction in the <br /> most recent gauging event, it is justified to determine the extent of <br /> possible impact in the western direction. Well MW-17 will be installed if <br /> MTBE impact is found to exist in MW-13. If groundwater concentrations <br /> are not detected in MW-13,then MW-17 will not be installed. <br /> Environmental Remediation Group Page 4 Site Assessment Work Plan <br /> Project No.0406 Joe's Travel Plaza <br />