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Site Investigation Work Plan <br /> Carousel Cleaners, Sacramento, California Investigation Rationale <br /> 2.0 Investigation Rationale <br /> Based on the PSGS Report(URS 2020),a Phase 2 investigation is recommended to further characterize <br /> the nature and extent of PCE and TCE contamination from the previous exceedances on site, as shown in <br /> Figures 3 and 4. To accomplish this investigation,IA/CS and downhole SG samples will be collected and <br /> analyzed for site contaminants. Permanent SG wells will be located around SG-04 and SG-08, in the area <br /> of the Laundry/Print Shop and SG-12 (Grease Trap), as well as at several step-out locations to better <br /> evaluate the horizontal extent. The SG wells will be permanent duel-nested construction,with a screen <br /> depths below 5 approximately 15 feet bgs; however,the well may be constructed as a single well if <br /> groundwater is encountered before the second depth is achieved. The IA/CS locations will be within the <br /> Laundry/Print shop footprint, in the vicinity of SG-2. Figure 5 shows the proposed locations. <br /> 2-1 <br />