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TABLE 4 <br /> PROPOSED GROUNDWATER SAMPLING SCHEDULE <br /> 102 S. Wilson Way, Stockton, CA <br /> Proposed <br /> vVVII ID Screen Sampling Rationale <br /> Schedule <br /> MW1 39-59 Semi-Annual Upgradient edge of plume-first groundwater <br /> MW2 38-58 Annual Redundant <br /> MW3 40-60 Annual Impacted by offsite plume <br /> MW4 50-63 Annual Impacted by offsite plume <br /> MW5 50-63 Annual Severe impact but redundant of other wells in heart of plume <br /> MW6 58-73 Annual Mostly redundant of MW1 -deeper screen, less impact <br /> MW7 58-76 Semi-Annual Differentiates between plumes <br /> MW8 58-78 Semi-Annual Defines downgradient extent of severe impact, attenuation monitor <br /> MW9 56-76 Annual Outside crossgradient) of plume. Of little value. <br /> MW10 55-75 Annual Outside crossgradient) of plume. Of little value. <br /> MW11 53-73 Semi-Annual Track downgradient migration and magnitude of impact <br /> i <br /> MW12 55-75 Semi-Annual Track downgradient mi ration and magnitude of impact <br /> MW13B 70-80 Semi-Annual Most severe impact in "B Zone" <br /> MW14 30-55 Annual Impacted by offsite plume <br /> MW15A 35-55 Semi-Annual Leading edge of plume-first groundwater <br /> MW15B 70-80 Semi-Annual Leading edge of plume- most hi hl _impacted interval <br /> MW15C 110-120 Semi-Annual Leading edge of plume-beneath most impacted groundwater <br /> MW16A 35-55 Annual Impacted by offsite plume <br /> MW16B 70-80 Annual Im acted by offsite plume <br /> VW1 50-60 Semi-Annual Most severe impact, midst of source area <br /> VW2 35-45 Annual Redundant <br /> VW3 39-59 Annual Redundant <br /> VW4 50-60 Annual Redundant <br /> VW5 14-42 None D <br /> VW6 30-60 jAnnual Redundant <br />