Remaining Sites Verification Package for the 100-D-2 Lead Sheeting Waste Site, Waste Site Reclassification Form 2007-030 Page: 3 of 37
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Attachment to Waste Site Reclassification Form 2007-030
REMAINING SITES VERIFICATION PACKAGE FOR THE
100-D-2 LEAD SHEETING WASTE SITE
The 100-D-2 Lead Sheeting waste site, part of the 100-DR-1 Operable Unit, was located approximately
50 m (164 ft) southwest of the 185-D Building and approximately 16 m (52 ft) north of the east/west
oriented road (Paddock Street) that passes south of the former D-Area water treatment plant. The site
consisted of a lead sheet covering a concrete pad. The history of this site is unknown. The 100-D Area
Technical Baseline Report (Carpenter 1993) refers to this site as an "undocumented solid waste site, lead
sheeting," and indicates that the purpose could not be determined by documentation. A review of aerial
photographs available of the 100-D Area from 1943 through 1976 indicates that the 151-D electrical
substation and the overhead steam lines were in the vicinity of the 100-D-2 waste site. According to a
1944 drawing of temporary construction facilities in 100-D Area (HEW 1944), a temporary railroad was
also located near this site. However, nothing conclusive was found to indicate the purpose of the lead
sheet covering the concrete. Lead sheets previously encountered at other areas of the Hanford Site were
used as shielding for penetrating radiation or for corrosion protection (i.e., as barriers below sulfuric acid
tanks and pumps).
Remediation of the 100-D-2 waste site was performed on April 12, 2007. The lead sheet, which was
approximately 0.64 cm (0.25 in.) thick, was removed and placed in a drum for later treatment and
disposal to the Environmental Restoration Disposal Facility (ERDF). The soil surrounding the concrete
pad was moved aside to expose the concrete pad for inspection. The concrete was determined to be
solid to at least a depth of 0.6 m (2 ft).
Verification soil sampling was performed on October 8, 2007, with one soil sample collected adjacent to
each side of the concrete pad. Each sample consisted of 20 aliquots of soil distributed across the surface
(0 to 0.15 m [0 to 6 in.]) below the existing ground surface, combined into one sample representative of
each of the four sides. The analytical results indicated the presence of lead up to 578 mg/kg, exceeding
the direct exposure cleanup criteria. Additionally, a sample chipped from the surface of the concrete
exhibited lead at a concentration of 32,900 mg/kg. Therefore, additional excavation to remove the
concrete pad and surrounding soil was performed on October 15, 2007. Approximately 216 metric tons
(239 US tons) of soil and concrete were excavated and disposed of at ERDF.
Following excavation of the 100-D-2 waste site, a second set of verification samples were collected on
October 17, 2007, to determine if the remedial action was adequate to support site closure. The
analytical results of this sampling indicated that the waste removal action achieved compliance with the
remedial action objectives and goals for the 100-D-2 waste site. A summary of the cleanup evaluation
for the soil results against the applicable criteria is presented in Table ES-1. The results of the
verification sampling are used to make reclassification decisions for the 100-D-2 site in accordance with
the TPA-MP-14 procedure in the Tri-Party Agreement Handbook Management Procedures
In accordance with this evaluation, the verification sampling results support a reclassification of this site
to Interim Closed Out. The current site conditions achieve the remedial action objectives and the
corresponding remedial action goals established in the Remedial Design Report/Remedial Action Work
Remaining Sites Verification Package for the 100-D-2 Lead Sheeting Waste Site
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Dittmer, L. M. Remaining Sites Verification Package for the 100-D-2 Lead Sheeting Waste Site, Waste Site Reclassification Form 2007-030, report, March 19, 2008; United States. (digital.library.unt.edu/ark:/67531/metadc894717/m1/3/: accessed March 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.