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._A <br /> f' 620 Charter:Way <br /> Page 3 of 3 <br /> While not necessarily showing all data in diagrams and drawings, an adequate SCM.can be utilized <br /> to account for most of the known data and to illustrate additional assessment needs thereby <br /> providing the justification for all work proposed in future work plans. All analytical data should be <br /> included in tables. Methods and calculations of contaminant masses should be included in the <br /> SCM, and may be submitted as an appendix. The SCM should be updated each time new data are <br /> acquired that cause a change of interpretation or expands the model until model modifications are <br /> not needed:to explain subsequently acquired data. As the SCM becomes complete, it can be <br /> utilized to reasonably predict additional investigation results and .plume response to various <br /> remedial technologies or to changes in groundwater flow regime. .The model should adequately <br /> demonstrate all interpretations and opinions. For example, data from the eleven CPT borings can <br /> be used to subdivide the subsurface into hydrologic units to identify contaminant migration <br /> pathways. The source area and the area in the inferred down-gradient direction should be where the <br /> vertical delineation of the dissolved plume is established. <br /> i <br /> Groundwater samples have not been analyzed for methanol and ethanol since November 1997. <br /> Please analyze groundwater sample from all monitoring wells for these compounds during the next <br /> groundwater-monitoring event. <br /> Please submit an SCM to EHD by September 30, 2004. If you have any questions.regarding this <br /> letter, please ' contact Vicki McCartney at (209) 468-3456 or by electronic mail at <br /> vmccartney@sjcehd.com. <br /> Donna Heran,REHS,Director <br /> Environmental Health Department <br /> Vicki McCartney,REHS Nuel C.Henderson,Jr.,RG j <br /> Unit IV-Site Mitigation Unit N- Site Mitigation <br /> cc: James L.L.Barton—CVRWQCB <br /> Joe W.Neely—Cambria <br />