Environmental Site Assessment Guidelines - Ohio Department of ...

features such as contaminant plumes. Geophysical methods that may be employed include
ground penetrating radar, electromagnetic conductivity testing, and magnetometer surveys.
The geophysical survey must be conducted as part of the Phase II ESA field activities but
conducted prior to drilling activities. A detailed discussion of the investigative technique,
equipment, any limitations of the investigative method, and interferences with the results of the
geophysical survey should be included.
9.1.5 Phase II ESA Findings; Data Evaluation; Regulatory Interpretation
9.1.5.1 Field Screening Results
A discussion of field screening results and apparent trends should be included. In addition, all
field-screening data should be tabularized and included in the soil boring logs. As an option to
using tables, a parcel diagram may be used to show the results associated with the soil boring
and/or monitoring well location.
9.1.5.2 Boring Log Descriptions
A discussion of the geology and hydrology (if applicable) for each parcel based on the soil
boring logs should be included. This discussion should be used to assess likely routes of
contaminant transport. Soil boring logs should be completed and indicate information such as
soil characteristics (i.e. texture, color, moisture content, etc.), terminal depth, samples
submitted for analysis, and where the saturated zones were encountered. If a groundwater
monitoring well is installed, then the boring log should indicate the static water level measured
prior to ground water sampling.
For some parcels where the level of concern is great and a whole ROW take is anticipated, the
direction of groundwater flow and the hydraulic gradient should be determined. Where strip
ROW is required from a site, determining the direction of groundwater flow and the hydraulic
gradient is generally not necessary.
9.1.5.3 Analytical Test Results
A discussion of the analytical test results and apparent trends must be included. In addition, all
analytical test data should be tabularized. As an option to using tables, a site diagram may be
used to show the analytical test results associated with the soil boring and/or monitoring well
location.
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