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Statt Evaluation of Four <br /> Each Monitoring Well for Consecutive YES <br /> BTEX,TPH-Gasoline, Quarterly Sampling <br /> Events <br /> and Oxygenates mpleted� <br /> NO <br /> Quarterly Sampling Location <br /> of Well with <br /> Respect <br /> to Plume <br /> Upgradient Well I I <br /> MW-DIS-5 Crossgradient Well i Well in D Plume <br /> MW-DIS-6 I Downgradient Well I <br /> MW-DIS-7S I Il I Mw-DIs-3 I Mw.Dis-2 <br /> MW-DIS 8S l [Ta Be lnstalledy I MW-DIS-9 NP-1-70 <br /> Mw DIS-10 I NP-1-80 <br /> MW-DISM } I I NP-1-90 <br /> � I I <br /> I } I <br /> ND for YES I ND for YES I ND for YES I Quarterly Sampling- <br /> Four Consecutive No Sampling ! Four Consecutive Sem'-Annual Samplin I Four Consentive Annual Sampling I through 1999; <br /> Events Required } Events (F"si A Third Quarter I Events (Third Quarter) I To Be Re-evaluated <br /> I After 1999 <br /> NO N4 NO <br /> I <br /> Semi-Annual Samplin { Quarte SamplingI I <br /> (first A Third Quarter J I Quarterly Sampling I <br /> } I I <br /> I I I <br /> I I <br /> Note:Water level measurements to be collected quarterly <br /> Figure 3 <br /> Groundwater Monitoring Frequency. <br /> Decision Tree <br /> DISCO Site,Stockton,CA <br /> 131420.A1.05-Dedsion(2Rvd).FH8 -8!4!99 me C11-1121VIIHILL <br />