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Item Paragraph Response Task 7 1,2,3,5 The objective of this task was to On-site determine if any of the total chro- Soil Sampling mium present in the soils is in the Hexavalent hexavalent state. It was never in- Chromium Testing tended, nor is it possible, to use this type of data to compare with past data and draw conclusions in regard to migration, transport, etc. Areas where known high total chromium was found previously were sampled and tested for total chromium and hexa- valent chromium. We have assumed that if enough samples were taken enough samples in locations where high chromium was known to occur, we would likely find some specific samples that did contain high chromium. If the sam- ples with the highest total chromium tested negative for hexavalent chrom- ium, then we could conclude that the soils found at the plant site contain- ing total chromium concentrations do not contain significant concentrations of hexavalent chromium. The data showed exactly what we ex- pected and samples with the highest total chromium did not contain hexa- valent chromium. Task 12 Fencing repairs and a guard service Preliminary PHER to prevent trespassers was implemented in May, as previously reported to DHS in M&B's May 27, 1988 response to state comments. 2 Until the sample results are received we will not know if a dioxin-related PHERA will be needed. Assuming dioxins are not a problem as described in the preliminary assessment, a PHERA would be minimal. If dioxins are found at significant levels then a PHERA would be included as part of the dioxin assessment report. 3 Air monitoring is being conducted at the M&B Portland plant, which is very similar to the Stockton plant. We propose to review the Portland plant data with the DHS to evaluate what