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Facility and PBR Units Closure Work Plan <br /> 1848 and 1856 Field Ave.,Stockton, California <br /> rain water may have washed some concrete dust into the samples). Furthermore, it is possible the high pH <br /> levels are not associated with chemical storage,because the substances stored in the bulk storage tanks were <br /> acidic (etch and spent etch) or neutral (LCR), not basic. This suggests that the natural soil pH should be <br /> determined. <br /> ` In summary, because prior sampling results are inconclusive, further sampling of the soils underlying the <br /> containment system is necessary to determine if these chemicals have been released to the environment. <br /> 2.2.3 Potentially Elevated Copper in Concrete <br /> Concrete sample BL 1-05(shown on figures as Location 05)was collected at one of the two develop-etch-strip <br /> (DES)lines in the southern end of the building.Its specific location was selected in the field as an area which <br /> appeared to pose the most potential for release to the underlying soil,such as a low spot in the flooring where <br /> ., there was no chemical resistant coating. Chemical analysis, as presented in the Characterization Summary <br /> report,detected 370 mg/kg of copper at this location. <br /> 2.3 Action Plan for Issues and Potential Issues at 1848 Field Avenue <br /> 2.3.1 PBR Units <br /> ` No other investigation or remediation is necessary prior to closure,given that investigation data presented in <br /> the Characterization Summary indicates that no release occurred from the PBR units. <br /> r <br /> In conjunction with the report documenting facility characterization and remediation,Tyco will file a request <br /> for closure of the two outstanding PBR permits. <br /> r 23.2 Former Chemical Storage Tanks <br /> Tyco intends to remove the secondary containment systems on which the former chemical storage tanks once <br /> stood so that the property can be returned to the property owner in its original condition. Removal of the <br /> secondary containment systems includes removing the concrete secondary containment walls and floor and the <br /> underlying sand and plastic liner system. <br /> L:IWOR%16909OGenemARe(d WPiMeldAre WPAug03 re 2.dx 6 August 2003 <br /> r <br />