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Four <br /> Start Evaluation of Consecutive YES <br /> Each Monitoring Well for Quarterly Sampling <br /> STEX,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 <br /> N-DIS 5 I Crossgradient Well I Well in Plume <br /> NW-018-7S I Downgradient Well I MW-DIS-1 <br /> MYV•DIS•7D I MW-DIS-3 I N'1N•Dls-2 <br /> MW-DIS-8S I (To Be Installed) I MW-DIS-9 NP4-70 <br /> MWDIS•8D <br /> I I MW-DIS40 I NP-1-90 <br /> MW-DIS-OD I <br /> ( I I <br /> ND for YES ) FouND r YES Semi-Annual Sampling*)k Four Consecutive ND for (Third <br /> Annual Sampling Semi-Annual Samplin <br /> Four No Sampling I Consecutive (First 8 Third Quarter) I Events (Third Quarter) I (First&Third Quarter <br /> Consent d Required I Events I I <br /> I I <br /> NO I NO I NO I <br /> I <br /> Quarter SamplingI <br /> Semi-Annual Samplin I I Quarterly Sampling ; <br /> (First&Third Quarter I I <br /> 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 /> 131+2OA1.06-Deasiw(3Rvd).FH8 •1Var2M mai do CH2MHILL <br />