Over the years, RECON has used a wide variety of materials to construct and cap these units including:
- HDPE liners
- LLDPE liners
- Natural clay
- GCL liners
- Geocomposites
- Woven and non-woven geotextile
fabrics
- Fill material
- Top soil
Case Studies
LANDFILL EXCAVATION
CONFIDENTIAL CLIENT
Southern California
Remedial Construction Services, L.P. (RECON) was contracted to perform an emergency action (EA) for this 38-acre landfill located in Southern California. The site is located within the coastal region and surrounded by a residential neighborhood and a public school.
The landfill had received waste materials since the early 1900´s, including petroleum and other industrial waste. The site contains over 750,000 cubic yards of waste within several lagoons. Since the site was not an engineered landfill, the side berms supporting the waste were found to be unstable. In addition, recent heavy rains had caused stress cracks and leakage in the lagoons, which could potentially release stormwater onto the public streets.
Because of the deteriorating conditions of the landfill, an EA was enforced by local oversight agencies. The EA included a very tight schedule in order to complete site work before the inclement winter weather arrived, potentially causing additional destruction.
The EA included removing over 62,000 tons of nonRCRA and nonhazardous waste; installing stormwater control systems, drainage systems; and erosion control features. A specialized excavator was required to manage the consistency of the waste materials (e.g., highly viscous, saturated drilling muds, tank bottom sludge). RECON used a marsh excavator for excavating the waste within the lagoons areas and a marsh buggy to apply odor suppressing foam. To meet the project schedule, 50 truckloads of waste were shipped each day.
 Work also required extremely focused engineering controls due to highly odorous materials and the location of nearby sensitive receptors. Engineering controls included the constant application of foam suppressant to the excavated waste, and the application of an acrylic polymer to the working face of the excavation to minimize fugitive odors and dust.
Manpower loading for the project included up to 30 field employees for the majority of site work. The project logged over 36,000 manhours worked without a lost time/lost day work day incident or OSHA recordable incident.
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| RECON self-performed all onsite work with its internal work force, using the majority of its in-house equipment. |
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CAMU CONSTRUCTION
El Paso, Texas
 When Remedial Construction
Services, L.P. (RECON) was
contracted to construct a
Corrective Action Management
Unit (CAMU) at an El Paso
refinery, a value-engineered
approach to the rock cover
for the completed installation
resulted in a significant
cost saving for the client.
The 17-acre CAMU was designed
to receive waste and contaminated
soils excavated from existing
on-site Solid Waste Management
Units (SWMUs). The overall
project also included the
installation of leak detection
and leachate collection systems
in the CAMU, and construction
of a one-acre storm water
retention basin.
CAMU Construction
In the first phase of construction,
RECON excavated and stockpiled
soils from one half of the
CAMU and installed GCL and
60-mil HDPE liner materials.
The stockpiled material, together
with the excavated soils from
the second half of the CAMU,
were then placed on top of
the newly installed liner
portion, and the remainder
of the liner was installed.
A total of 545,000 square
feet of GCL/60-mil HDPE liner
was installed over the entire
CAMU excavation.
RECON excavated 400,000 cubic
yards of hazardous and non-hazardous
soils from the SWMUs in various
areas on the property, transported
them in off-road dump trucks,
and placed and compacted them
in the CAMU. An additional
108,200 cubic yards of on-site
oily soil was excavated solidified/blended
with clean soils, and placed
into the CAMU. The excavated
areas were backfilled with
new material and compacted.
Cost Savings
When excavation, placement
and compaction was complete,
the CAMU was capped with soil,
575,000 square feet of GCL/60-mil
HDPE, and 45,000 tons of rock
cover for erosion control.
RECON´s requested change in
the specification for the
rock saved the client $180,000
without reducing the effectiveness
of the cover.
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