A Contamination Impacts Survey should be conducted for each incident site as part of the STEP II remedial investigation (RI). The four exposure pathways are:
The human exposure to contaminated soil pathway is evaluated for each site. The other three pathways should be evaluated if the conditions described at the beginning of each pathway section are applicable to the site. For instance, if it is known or strongly suspected that ground water is contaminated, then complete the ground water section of the contamination impacts survey. The results of the impacts survey should be included and discussed in the RI report.
I. Human Exposure to Contaminated Soil
Identify the relative risk to humans, and particularly to children, who may come into direct and sustained contact with contaminated soil.
II. Ground Water
Complete the following activities if ground water analytical data indicates that ground water has been affected or if contamination in the soil and a hydrogeologic assessment indicate that ground water likely has been affected:
III. Surface Water
Complete the following activities if any surface water body is: a) within 200 feet of the site; and receiving or likely will receive discharge of ground water which is contaminated from the site, or, b) known or suspected of being contaminated from surface water runoff from the site. A surface water body includes wetlands, ponds, lakes, rivers, streams and intermittent.
IV. Other Potential Receptors
Consider any impacts from the site which are not previously accounted for. These include areas contaminated by surface water runoff or erosion and area with unusual wildlife mortality, stressed vegetation or visible erosion features.
651-201-6061 • Fax: 651-201-6112
Pesticide & Fertilizer Management Division