Phase II Environmental
Subsurface Investigation:
The scope of work for the Phase 2 environmental
sub-surface investigation includes a professional geologist
to be on-site to identify appropriate locations for
soil boring. Ordinarily, we may propose a geophysical
survey to establish the location of additional underground
structures, if they have a potential to exist (former
gasoline stations, military bases, etc.).
The number of soil boring locations will
be determined based on the size of the property, prior
use, existence of underground features (utilities and/or
underground storage tanks - USTs and similar). Soil
sampling may include sampling of groundwater, if groundwater
is encountered during drilling. The depth to first groundwater
is not always known.
Soil samples are often collected using
a Geoprobe sample rig. Normally, at least one soil and
one groundwater sample will be collected from each boring.
After each boring has been completed, the boreholes
will be backfilled with cement and concrete pads are
repaired with concrete. Often, for gas stations, the
soil and groundwater samples are analyzed for total
petroleum hydrocarbons, including gasoline and diesel
constituents. Analysis for total lead; benzene, toluene,
ethylbenzene and total xylenes (BTEX); volatile organic
compounds; solvents; and other organic constituents
may be required as well. The soils and/or groundwater
samples will be placed on a standard two week turnaround
time with a state-certified laboratory.
Once the field investigation has been
completed and the analytical laboratory results have
been obtained from the laboratory, a report is prepared
detailing the field investigation and analytical laboratory
results. The report will include a sample location map,
copies of the analytical laboratory data sheets, and
conclusions and recommendations for additional work,
if warranted. The report is prepared and signed by a
California professional geologist.
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