Long-Term Surveillance Plan for the Lowman, Idaho, Disposal Site. Revision 1 Page: 25 of 124
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LOWMAN LONG-TERM SURVEILLANCE PLAN
4.0 PERMANENT SITE SURVEILLANCE FEATURES
Survey and boundary monuments, site markers, and entrance and perimeter signs are the
permanent surveillance features at the Lowman site. Three survey/boundary monuments
and four boundary monuments define the seven corners of the irregularly shaped and
unfenced perimeter of the site. Twenty perimeter (warning) signs (including two along the
south entrance) were placed at spaced intervals around the site so that one or more signs
will be visible in daylight to a person approaching from any direction. One of the perimeter
signs and one site marker were placed at the official entrance to the site at the southwest
corner. The other site marker was placed near the center of the disposal cell on the 10:1
topslope.
The construction and emplacement of the site surveillance features are described below
and are in accordance with the specifications set forth in the DOE's Guidance for
Implementing the UMTRA Project Long-term Surveillance Program (DOE, 1992). The
coordinates for the boundary and survey monuments and site markers are presented in
Table 4.1.
4.1 SURVEY MONUMENTS
Three survey monuments, Berntsen RT-1 metal markers, were set into the top of a
truncated cone of reinforced concrete that is set in concrete. The design of the
survey/boundary monuments is shown in Figure 4.1. The depths of the holes for
the survey/boundary monuments were chosen so that the bottom of the holes were
at least 18 in (46 cm) below frost line [total depth 38 in (97 cm)]. The four metal
bars in each hole used as reinforcement for the concrete also serve the additional
purpose of being potential locating devices when using metal detectors should any
of the monuments become buried over time. The monument extends at least 4 in
(10 cm) above the ground surface for easy location.
4.2 BOUNDARY MONUMENTS
Berntsen federal aluminum survey monuments, Model A-1, were used for the four
site boundary monuments. The design of the boundary monument is shown in
Figure 4.2. The ceramic magnets epoxied in the cap and base are vertically
oriented for maximum detection if they become covered. The monuments were set
with the base 38 in (97 cm) below the ground surface and the top 10 in (25 cm)
aboveground to facilitate location.
4.3 SITE MARKERS
Two unpolished granite site markers constructed with the dimensions shown in
Figure 4.3 identify the site; the general location of the disposal cell; the date of
closure, September 14, 1991; the dry tonnage of residual radioactive materials
(222,230), and the curies of radioactivity (12 curies, Ra-226). Site marker SMK 1,
near the entrance to the site, is set in a bed of reinforced concrete that extends 3 ft
(0.9 m) below ground surface (Figure 4.4). Site marker SMK 2, at the center of the
cell, is set in a bed of reinforced concrete that extends to the top of the infiltration
radon barrier (Figure 4.4). The excavation and setting of SMK 2 was conducted in
DOEiAL/62350-36 APRIL 12, 1994
REV. 1, VER. 2 LOW004H.WC1
4-1PERMANENT SITE SURVEILLANCE FEATURES
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Long-Term Surveillance Plan for the Lowman, Idaho, Disposal Site. Revision 1, report, April 1994; Albuquerque, New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1310658/m1/25/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.