Laserfiche WebLink
2. Section 1.4, Summary of Pertinent Site Data, Paragraph 1.4.2, Page 1-2: The last <br /> sentence of this paragraph indicates that contaminant source areas are identified in <br /> Appendix C. Appendix C contains a single figure that shows TCE sites, lead and <br /> chromium sites,the pesticide mixing area, and the TCE groundwater plume. Paragraph <br /> 1.1.4,page 1-1, of the report indicates that there were 111 SWMUs at the site. The figure <br /> in Appendix C shows both areas with contamination as well as areas that qualified for no <br /> further action; however, the figure clearly does not identify the location of all 111 <br /> SWMUs. Please clarify whether the SWMUs and other areas of soil contamination <br /> presented on the figure in Appendix C represent only the areas with residual <br /> contamination where additional data are deemed warranted as addressed by this sampling <br /> and analysis plan. If this is true,please discuss whether all other areas in OU-2 have <br /> been adequately remediated and confirmed to have residual contamination below risk- <br /> based levels. If the figure provided in Appendix C is not comprehensive in illustrating all <br /> current sources and locations of contamination,please revise the report to include such a <br /> figure. <br /> 3. Section 2.1.2,Investigation Scope, Paragraph 2.1.2.1, Page 2-1: Please clarify <br /> whether groundwater is used for any purpose under any current scenario or will be used <br /> for any purposes under the future land use scenario. In addition, please discuss the water <br /> quality of the underlying groundwatAr. Please also discuss whether contaminated <br /> groundwater at the site acts as a source of recharge for any surface water bodies or is <br /> hydraulically connected to any aquifers of drinking water quality. <br /> 4. Figure 4, Conceptual Exposure Model, Page 2-7: The conceptual site model shows <br /> surface water and sediment as being secondary contaminated media. The description of <br /> the site as presented in the sampling and analysis plan does not provide sufficient <br /> information to understand whether any surface water bodies are impacted or are <br /> potentially impacted by site activities. In reviewing Figure 4.2-1, Solid Waste <br /> Management Units and Other Areas of Soil Contamination, (provided in Appendix C) it <br /> appears that there are some percolation ponds and possibly some sewage lagoons. First, <br /> please provide a discussion clarifying what surface water and sediment identified on <br /> Figure 4 are impacted by spills and runoff. For example, does this refer only to collected <br /> runoff or are actual surface water bodies impacted at the site. Second, if surface water <br /> and sediment are impacted by site activities discuss if it is plausible that an on-site <br /> worker, recreational adult/child, or trespasser youth could be exposed through contact <br /> and incidental ingestion of surface water and/or sediments and provide justification for <br /> excluding these exposure routes. <br /> 5. Section 2.3.7.2,Waste Disposal, Page 2-26: The report indicates that decontamination <br /> rinsate will be stored in a five-gallon bucket and will be disposed of at an on-site <br /> treatment facility. It would seem that more than five-gallons of decontamination rinsate <br /> are likely to be generated from drilling and sampling of 24 borings and that a 55-gallon <br /> drum may be more appropriate for this use. However,please indicate whether the bucket <br /> will be sealed at all times except for when rinsate is being placed in to the container. <br /> Also, please clarify whether the treatment facility is capable of accepting potentially <br /> hazardous waste. <br /> 3 <br />