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Halaco Engineering Co. IA Section 3
CAD009688052
3.0 INVESTIGATIVE EFFORT
WESTON® prepared a Sampling and Analysis Plan (SAP) (Appendix G) to establish whether
hazardous substances have migrated off-site to air, surface waters, surface sediments,
groundwater, and surface soils around the Site. In addition, samples were collected to
characterize the Waste Management Unit (see Appendix J). Both screening and definitive data,
as defined in the Intergovernmental Data Quality Task Force: Uniform Federal Policy for
Quality Assurance Project Plans, EPA 505-B-04-900-B, were generated during this effort.
3.1 Field Work
On June 19, 2006, WESTON® mobilized to the Site in order to execute the SAP. The scope of
work for the field work included:
• Collect up to 380 soil, sediment, and slag/waste samples from surface and subsurface
locations to be field screened for metals and gamma radiation.
• Submit up to 118 soil, sediment, and slag/waste samples to a fixed laboratory for metals
and radionuclide analyses, as well as a limited number of subsurface samples for volatile
organic compound (VOC) analysis.
• Collect up to 50 air samples to be screened for metals and alpha radiation; submit 10
samples to a laboratory for metals analysis (this number was later changed to 35; see
changes to SAP below).
• Collect 10 surface water samples to be analyzed for metals, VOCs and radionuclides.
• Collect 14 groundwater samples to be analyzed for metals, VOCs and radionuclides.
In addition, the following changes to the scope of work were made after the SAP was approved:
• Air samples were not submitted for radionuclide analysis because alpha screening did not
indicate the presence of radionuclides above background.
• The air samples were analyzed for metals in a laboratory because the X-ray Fluorescence
(XRF) detection limits are too high; 35 samples were collected and analyzed for metals.
• Eight fish samples were collected from the OID and the downgradient lagoon; these fish
were analyzed for metals and radionuclides.
• The number of air samples collected was changed because four of the six high-volume air
pumps were stolen on the night of June 22, 2006.
• Dedicated equipment was used to collect samples from this Site, so no equipment blanks
were considered necessary.
• Unfiltered water samples were collected and analyzed.
In order to collect subsurface soil samples and groundwater samples where there were no existing
wells, WESTON® advanced soil borings using a GeoProbe® direct-push device at 40 locations,
and installed groundwater monitoring wells at nine of these locations. Each of these locations
was cleared through Dig-Alert, as well as by a certified geophysical subcontractor, before drilling
commenced. Weston installed 1.25-inch wells in nine of the boring locations, as described in
Section 3.1.2 below.
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