EP 1110-1-19
30 Jun 01
Exhibit 4-1, cont.
Example Abstract
Total actual cost = 5,523 with RA capital costs of 3,026 and RA
Costs:
operating costs of 2,497.
Total estimated remaining O&M cost = ,000 for five years of
groundwater monitoring.
The technology-specific unit cost of land treatment was calculated at
.73 per cubic yard.
From 1948 to 1986, the ABC company operated the U Creosote site as a
Description:
lumber treatment facility. Lumber treatment processes included the
pressure-treatment of lumber products. Small rail cars were used to move
lumber to two treatment cylinders. A mixture of either creosote and water
or PCP and petroleum was used to treat the lumber. The treated lumber
was dried on racks over bare soil and stored in an area north of the
treatment cylinders.
The results of a remedial investigation/feasibility study (RI/FS) conducted
at the site between 1992 and 1996 confirmed that soils and sediments in the
lagoon and drainage ditch were contaminated with polycyclic aromatic
hydrocarbons (PAH). During the RI/FS, EPA and the PRPs agreed to
address the site as two operable units (OUs). OU 1 includes the lagoon and
former plant facility, which has been addressed separately. The record of
decision for OU 2 was signed on March 8, 1996.
During land treatment, the soil for each of three lifts was placed 4 to 12
inches thick in the land treatment area and inoculated with PAH-degrading
microorganisms. An inoculum was sprayed on the soil and the land
treatment area was cultivated once every two weeks. An irrigation system
was used to maintain a 10-percent soil moisture content. The concentration
of microorganisms in the soils was found to be adequate to support
biological activity, and no inoculum was applied for the second or third lift.
Additionally, the total number of lifts applied to each subplot varied
because several of the half-acre areas exceeded the TCIC concentrations of
100 mg/kg. Subsequently, no additional soil was placed in those subplots
until the analytical results indicated less than 100 mg/kg.
On October 17, 1998, the PRPs provided a written report that the remedial
action has been fully performed and the performance standards of the
consent decree have been attained. As specified in the ROD, the PRPs will
continue semiannual monitoring of groundwater through 2002 to confirm
that groundwater will not be adversely impacted by the land treatment
activities.
4-2.
Introduction.
a.
The introduction should include a brief description of the location, size,
environmental setting, and history of the site. The site history should describe the operations and
waste management practices that contributed to the contamination of the site, and the regulatory
and enforcement activities that have occurred. The introduction should also discuss the major
4-3
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