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Start Evaluation of Four <br /> Consecutive <br /> Each Monitoring Well for Quarterly Sampling YES <br /> BTEX,TPH-Gasoline, Events <br /> Oxygenates,1,2-DCA, Completed? <br /> EDB,and TBA <br /> NO <br /> Quarterly Sampling Location <br /> of Well with <br /> Respect <br /> to Plume <br /> Upgradient Well <br /> WDIS-MW-DIS-5 ) I Crossgradient Well I Well in Plume <br /> MW-DIS-7S I Downgradient Well <br /> I I MW-DIS-1 <br /> MW-DIS-7D (To Be Installed) I Mw-DIS-3 I MW-DIS-2 <br /> MW-DIS-BS I I MW-DIS-9 I NP-1.70 <br /> MW-DIS-BD MW-DIS-10 <br /> MW-DIs-BD 7 I NP-1-90 <br /> I I <br /> ND <br /> I I <br /> I ND for YES I ND for <br /> FourYES I Four Semi-Annual Sampling I Four Consecutive <br /> Annual Sampling Semi-Annual Sampling <br /> N Requird Sampling i Consecutive (First 8 Third Quarter} I Events {Third Quarter) I (First 8 Third Quarter) <br /> Events I I <br /> I I I <br /> NO I NO;jNO <br /> I Quarterly Sampling I I I <br /> I I I <br /> I I <br /> Nate:Water level measurements to be collected quarterly <br /> Figure 4 <br /> Groundwater Monitoring Frequency <br /> Decision Tree <br /> DISCO Site,Stockton,CA <br /> 131420A1.06-Decision(3RA)THB -7!5!2000 cc CF12MHILL <br />