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AEach <br /> rt Evaluation of Four <br /> 01 orin Well for ConsecutiveYES <br /> g Quarterly SamplingX,TPH-Gasoline, Events <br /> nd Oxygenates omplet <br /> NO <br /> Quarterly Sampling Location <br /> Of Well with <br /> Respell <br /> to Plume <br /> Upgradient Well I I Crossgradient Well I Well in Plume <br /> MW-DIS-5 I <br /> I MW-DIS-1 <br /> MW-DIS-6 Dowagradient Well I MW-DIS-3 I MW-DIS-2 <br /> MW-DIS-75 I o Be Installed NP-1-70 <br /> MW-DIS-1D I ) MW-DIS-9 I MOIS-10 l NP-1-80 <br /> MW-DIS-8S I I NP-1-90 <br /> MW-DIS•BD I <br /> I i <br /> I I I <br /> ND for II i Quarterly Sampling- <br /> YES No Sampling I Semi-Annual Samplin I ND for �S Annual Sampling I through 1999; <br /> Four Consecutive First Third Quarter Four Consentive (Third Quarter) I To Be Re-evaluated <br /> Events Required I I Events After 1999 <br /> I <br /> NO 1 NO I <br /> I <br /> Semi-Annual Samplin ; :jYES <br /> Quarterly Sampling I <br /> (First&Third Quarter I I <br /> I I I <br /> I 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 /> CH2MHILL—J <br /> 131420.A1.05-Dedsion(2Rvd).FH8 -9130199 mai <br />