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Well Sampling Frequency Decision Logic <br />Groundwater Well Installation Work Plan <br />Sharpe Army Depot, <br /> Lathrop, California <br />Figur1e 6 <br />Is This <br />a New Well <br />Installed as Part of the <br />GWMP with Less Than <br />Four Sample <br />Results <br />? <br />Is This a <br />Guard Well <br />(Downgradient of <br />Plume) <br />? <br />Is This a <br />Designated <br />Plume Core <br />Well <br />? <br />Does <br />Well Define Plume <br />Stability <br />? <br />Is This <br />a Downgradient <br />Plume Stability <br />Well <br />? <br />Does <br />This Well Provide <br />the Most Representative <br />Sample Compared to <br />Other Wells in the <br />Area/Zone <br />? <br />Sample <br />Twice a Year <br />Sample <br />Quarterly <br />Does <br />This Well Provide <br />the Most Representative <br />Sample Compared to <br />Other Wells in the <br />Area/Zone <br />? <br />Sample <br />Twice a Year <br />Does <br />This Well Provide <br />the Most Representative <br />Sample Compared to <br />Other Wells in the <br />Area/Zone <br />? <br />Sample <br />Yearly <br />Does <br />This Well Provide <br />the Most Representative <br />Sample Compared to <br />Other Wells in the <br />Area/Zone <br />? <br />Sample <br />Yearly <br />Does <br />This Well Provide <br />the Most Representative <br />Sample Compared to <br />Other Wells in the <br />Area/Zone <br />? <br />Sample Every <br />Other Year <br />Are <br />Water Level <br />Measurements Needed <br />at This Location <br />? <br />Measure <br />Water Levels <br />Twice a Year <br />Decommission <br />Well <br />No <br />Yes <br />No <br />Yes Yes <br />No <br />Yes Yes <br />Yes <br />No <br />Yes <br />Is This <br />a Background <br />Well (Upgradient of <br />Source Areas) <br />? <br />Yes <br />Yes <br />Yes <br />No <br />No <br />No <br />No <br />No <br />No <br />Yes <br />Yes <br />No <br />No