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SVE On <br /> Sub-Slab Vapor(SSV)Sampling Event <br /> Install SSV probes&collect SSV samples <br /> with SVE on. <br /> Page 5 <br /> Exhibit 1. VIA Decision Motrix <br /> EfTurn SVE off. <br /> or_I month <br /> Do SSV <br /> Indoor Air Sampling Event concentrationsNoYes <br /> SSV Sampling Event <br /> Conduct indoor air exceed MTCA Collect SSV samples <br /> Yes <br /> evaluation with SVE off. with SVE on? with SVE off. <br /> Do SSV <br /> concentrations <br /> exceed MTCA <br /> with SVE off? <br /> No <br /> Do indoor Preliminary VI Risk Not Identified <br /> concentrations No (to be verified with supplementaE remains off <br /> exceed MTCA lines of evidence including <br /> Yes <br /> with SVE off? additional seasonal sampling) <br /> SSV Sampling Event <br /> Collect SSV samples <br /> with SVE off. <br /> Indoor Air Do SSV <br /> Sampling Event concentrations <br /> Conduct indoor air exceed MTCA <br /> No <br /> evaluation with SVE off. with SVE off? <br /> Do indoor <br /> VI exposure pathway concentrationsKin VI exposure risk <br /> is complete. exceed MTCA not identified. <br /> with SVE off? <br /> Additional mitigation/remedy SVE remains off. <br /> needed. Active VI mitigation not likely <br /> considered as part of remedy. <br /> ENVIRONMENTALEES <br /> 1NSULTING,INC. 2120-02 20241 1 4I4IS <br />