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Start Evelueli00 of Each Less than Four NO <br /> Mondortng Well for PNAs, Consewtive <br /> BTEX,TPM-Diesel,and TPH- Quarters Sampling <br /> Gasoline Done? <br /> VES <br /> Quarterly Sampling Well Relationship to <br /> PlumeZ • <br /> Groundwater <br /> Zona <br /> INO <br /> ume: <br /> Downgradieni Wells. Crossgmdienl Well: 9R,13, <br /> Upgradlent Wells: MW-20,21,23R,24, MW-2 R <br /> MW-1D,15 25,26R <br /> YES <br /> ND for Four Results VES amplin <br /> ND for Four VES ND for four NO Annual No ty Sampling <br /> Consecutive No Sampling Consecutive ual co ae utwo Sampling ng? <br /> Rounds? Rounds? Sampling <br /> ONOES NO <br /> nualAnnual ing <br /> Sampling Other VES Well Distant VES <br /> Davmgradwrlt No from Plume, Annual • <br /> Wells Nearer Sampling Level.Within Sampling <br /> Plume? Background? <br /> NO NO <br /> Annual Semi-Annual <br /> Sampling Sampling <br /> Note: Semi-Annual: First B Third Quarters FIGURE 1 <br /> Annual: First Quarter _ <br /> ENDECISION TREE <br /> Viv GROUNDWATER MONITORING <br /> Reference: Chart adapted from CH2MHIn Operation and Mainfainance Plan,PG&E Stockton, A M E R I C A REVISED 11117104 <br /> Former Manufactured Gas Plant Site;August 2000 <br /> —om.m„r„q,,,,,,,,o. PG&E FORMER MGP SITE <br /> C—I.g acwswoon STOCKTON,CALIFORNIA <br /> 11/18/2004 <br /> Mg•wocauov.wnvremono-» <br />