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Four <br /> Start Evaluation of Consecutive YES <br /> Each Monitoring Well for Quarterly Sampling <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 /> MW-DIS-5 I I Crossgradient Well I Well in Plume <br /> MW-DIS-6 I I <br /> MW-DIS-1 <br /> MW-DIS-7S I Downgradient Well I MW-DIS-3 I MW-DIS-2 <br /> MW-DIS-71) (To Be Installed) MWDIS•9 NP-1.70 <br /> W <br /> MDIS•8S I I I NP-1.80 <br /> MWDIS-81D I I MW-DIS-10 I NP-1.90 <br /> MW-DIS-8D 1 <br /> I <br /> � I I <br /> ND for YES NFourrr YES Semi-Annual Samplin ND for YES Annual Sampling Semi-Annual Sampling <br /> Four No Sam lin First&Third Quarter Four Consecutive (Third Quarter I <br /> p g Consecutive ( (First&Third Quarter <br /> Consecutive Required I Events March&September I Events September 2400) I March&September 2000 <br /> Events I 2000) I I <br /> I I <br /> NO , NO I NO <br /> Semi-Annual Sampling Quarterly Sampling Quarterly Sampling <br /> (First 8 Third Quarter I I � <br /> March&September 2000 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 /> 131420.A1.06•Decision(3RWd.FH8 •2!13101 we sfo C142MHILL <br />