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Facility and PBR Units Closure Work Plan <br /> r 1848 and 1856 Field Ave.,Stockton, California <br /> industrial setting than to metals in soil in a residential setting. <br /> In the Facility Closure Plan,Tyco previously proposed that pH levels in soil from the range between 5.0 and <br /> 9.0 be considered acceptable for closure. In general,Tyco intends to continue using this range as its cleanup <br /> goals for pH in soil.However,if natural pH levels in site soil are basic,particularly if typically above pH 9.0, <br /> ` Tyco will likely revisit the pH 9.0 cleanup goal.For pH in concrete,a pH between 5.0 and 12.0 is proposed as <br /> acceptable given the high natural pH of cement. <br /> 5.0 REPORTING <br /> Following the remedial actions described above, a closure report for the facility will be submitted to the <br /> v County. The closure report will document the site closure activities, present conclusions, and request case <br /> closure if appropriate. The report will detail all characterization and remediation activities including: <br /> r • Facility decontamination and waste disposal in late 2001; <br /> • Sampling and analysis in December 2001, including certified analytical results for the chemical <br /> r, analyses; <br /> • Waste disposal information for the sand from the former chemical storage tank containment system <br /> ` and confirmatory sampling results for soil beneath the former chemical storage tanks;and <br /> • Removal and disposal of soil at 1856 Field Avenue containing TRPH, and associated confirmatory <br /> sampling results. <br /> The report will also be suitable for closure of the PBR units.As required by Title 22 CCR§67450.3(c)(11)(G), <br /> the report will include a certification signed by an authorized representative of Tyco (the FTU owner and <br /> operator)and by an independent,professional engineer registered in California,that closure of the two PBR <br /> FTUs was completed in accordance with the Work Plan and the Facility Closure Plan and that the closure met <br /> or exceeded applicable regulatory requirements. <br /> r <br /> r <br /> r <br /> L:IWOM690991Ge..Mid(d WPFteldAw WPAug03 rev2.dor 14 August2003 <br />