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A <br /> V*YES <br /> ess than NO <br /> Consecutiveers SomplinDone? <br /> YES <br /> Quoterly Sampling <br /> Well <br /> Relationship to Plume <br /> Within Groundwater <br /> Zone <br /> Upgradient Well Downgradient Well (rossgradient Well Well in Plume <br /> NO far YES No NO for NO Quoterly NO for YES Annual Sampling Results Steadily YES Semi-Annual Samplin <br /> Four Consecutive Sampling Four Consecutive Sampling Four Consecutive (Third Quarter) Decreasing? (First&Third Quarters <br /> Rounds? Rounds? Rounds? <br /> NO YES NO NO <br /> Annual Sampling <br /> Third Quarter YES Quarterly Sampling <br /> Annual Other YES Well Distant Al Sam hn <br /> Downgradient Wells Annual Sampling from Plume,Levels Within Sampling <br /> Nearer Plume? - (Third Quarter) Background? (Third Quarter) <br /> NO NO <br /> Semi-Annual Sam ling Semi-Annual Som ling <br /> (First&Third Quarters) (First&Third Quarters) <br /> Groundwater Monitoring Frequency <br /> Decision Tree <br /> PG&E Stockton Former MGP Site <br /> CH2MHILL <br /> 110716.MN ZZ•Decision•10/20/98•pm•lfo <br />