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/ Start Evaluation of Four <br /> Each Consecutive Monitoring Well for Quarterly Sampling YES <br /> BTEX,TPH-Gasoline, Events <br /> and Oxygenates completed� <br /> NO <br /> Quarterly Sampling location <br /> of Well with <br /> Respect <br /> to Plume <br /> Upgrndienf Well I I I <br /> MWDIS-i Crossgradient Well Well in Plume <br /> MW-DIS-6 I I I AM1W-DIS-1 <br /> MW-DIS-7S I Downgradienf Well I MW-DIS-3 I MW-DIS-2 <br /> MW-DIS-7D {To Be Installed} MW-DIS-9 NP-1-70 <br /> MW-DIS-BS l I MW-DIS-10 l NP-1-80 <br /> MW-DIS-BD I I I NP-1-90 <br /> 1 <br /> I I I <br /> ND for YES I NO for YES I ND for YES I <br /> Four Consecutive No Sampling I Four Consecutive ami-Annual Samplin I Four Consecutive Anneal Sampling I Semi-Annual Samplin <br /> Events Required I Events (First 8 Third Qunrler I Events (Third Quarter) I {First&Third QuarteT <br /> NO NO NO <br /> Semi-Annual Samplin I Quarterly Sampling I Quarterly Sampling I <br /> {First&Third Quarter I I I <br /> I <br /> I I <br /> Note:Water level measurements to be collected quarterly <br /> Figure 4 <br /> Groundwater Monitoring Frequency <br /> Decision Tree <br /> DISCO Site,Stockton,CA <br /> 431420.A1.D6•Uecision(3Rvd).FNB •!121!2000 pm <br /> CH2MHILL <br />