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James Tj osvold <br /> Febgruary 7, 1990 <br /> The purpose of the sampling conducted by DHS was to confirm <br /> results of M&B air model. The results from boundary and off site <br /> samples indicate that arsenic and PCP above DHS and EPA action <br /> levels are possibly leaving the facility. <br /> At this time, additional work will be necessary based on the <br /> results collected by Radian. M&B can approach the project in two <br /> ways. One approach is to resample at the boundary and nearby <br /> receptors for a one year period. Archived samples for arsenic <br /> can be analyzed to establish a larger data base. Analyses should <br /> include PCP, arsenic, dioxin, and PAH. Sampling results inputted <br /> into a complex terrain air model will determine year round <br /> exposure and amounts. Locations identified by the model should <br /> be monitored. <br /> The second approach is to identify the sources and to reduce <br /> emissions below an acceptable level. Verification monitoring <br /> would be required. <br /> Jeff Van Slooten <br /> Associate Hazardous Materials <br /> Specialist <br /> Region 1 <br />