feature project: Trihydro performed a Phase I site assessment on a large tract of land under consideration by a large utility company for the purpose of constructing and operating a wind farm to generate electricity.
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Representative Projects: Petroleum/Petrochemical
Client: Confidential Location: Bakersfield Project Overview: Trihydro was contracted to provide operation and maintenance services for an existing 4000 scfm soil vapor extraction system at an operating petroleum refinery in Bakersfield, California. Trihydro modified the 4000-scfm design and had the system fully operational within two months, significantly increasing the online performance of the unit.
Rapidly changing groundwater conditions at the refinery necessitated more aggressive subsurface remediation. Therefore, Trihydro personnel designed, assisted in the construction of, and operated an expanded 21,000-scfm vapor extraction system in addition to the original 4,000-scfm unit. The major components of the 21,000 scfm unit designed by Trihydro includes three Roots Blower systems (7,000 scfm each), one 450 hp Roots injection blower, six 13,500 pound granular activated carbon beds (desorbed by steam), all condensate handling equipment, an air stripper, an oil water separator, a cooling tower, and a 650 cfm air compressor.
The system is automatically controlled by PLC. Trihydro personnel were responsible for negotiating the air quality permit for the expanded VES with the San Joaquin Air Quality Control District (SJAQCD). Trihydro simultaneously designed, installed, and operated a 36-well air sparge network to remediate groundwater underlying the refinery. The system has been recently expanded, and the system continues to operate. Both the VES and air sparge systems were constructed in accordance with the refinery's General Engineering and Material Specifications (GEMS).
Trihydro also conducted a number of related environmental activities at this refinery including:
Monitoring groundwater quality throughout the refinery and producing reports for submittal to the Regional Water Quality Control Board (RWQCB)
Negotiating cleanup standards with the RWQCB
Designing and installing monitoring and remediation wells to increase their useful lifespan during rapidly changing groundwater levels (both rising and falling)
Conducting refinery-wide soil and groundwater quality investigation, identifying possible sources of soil and groundwater degradation in previously unidentified areas
Conducting numerous other environmental assessment and remediation projects at the refinery including projects utilizing technologies such as enhanced bio-venting, land farming, small scale soil vapor extraction, and free product recovery
Client: Former Petroleum Refinery Location: Casper, Wyoming Project Overview: Trihydro was contracted to conduct site supervision, environmental compliance consulting, and engineering services associated with demolition, remediation, and reclamation of a closed petroleum refinery in Casper, Wyoming. Process units and associated structures were demolished and hauled offsite for recycling/disposal. Approximately 300 acres of the site were then regraded to provide positive drainage and minimize potential for erosion and channelized flow. Currently, Trihydro is supervising and inspecting the phased revegetation/reclamation of the disturbed areas at the site.
As part of the project, Trihydro designed and supervised construction of a sealable-joint steel sheet piling barrier wall to limit potential migration of soil and groundwater contamination to surface water. As part of the design, Trihydro coordinated and prepared the prerequisite construction permit applications; including a 404 permit from the Army Corps of Engineers (ACOE), a flood-plain development permit from Natrona County, and a general NPDES permit. Trihydro also identified riparian wetlands that would be affected by the project and helped obtain appropriate ACOE permits allowing in-place, in-kind replacement of these wetlands.
Trihydro is currently monitoring the establishment of the new wetlands pursuant to the approved construction permit. Trihydro prepared a stormwater pollution prevention plan (SWPPP) for construction activities conducted at the site which required installation, maintenance, and inspection of temporary erosion control measures. In addition to the temporary stormwater control measures, Trihydro designed and supervised construction of permanent stormwater control structures to protect the integrity of the sheet pile wall, prevent site erosion, and protect surface water quality. Trihydro is currently responsible for maintenance, inspection, and reporting for the permanent stormwater control measures.
