|
TEC ACCUTITE
>>
Projects >>
Environmental
TEC Accutite has been
executing environmental projects at fuel and solvent leak sites
since 1986. These projects included subsurface investigations, risk
assessment, clean up, and case closure. The main objective of our
company is to provide our clients with the most cost effective
solution, satisfy the regulatory requirements, and protect the
environment. TEC staff includes registered professional Geologists
and Engineers, Environmental Scientists, and field construction
personnel, teaming together to offer one of the most diversified
environmental services on the market. Below, we present abstracts of
projects completed successfully.
Sample Projects
Dual Phase Extraction (DPE)
Following tank removal, a
subsurface investigation was conducted to determine the extent of
contamination, it was found that the plume extends under the
building. A sensitive receptor survey was done to assure no off-site
parties were affected. The remediation system uses dual phase
extraction to remove contaminant vapors for the vadose and smear
zones. The system features downhole pumps that are self-modulating
to depress groundwater levels to an adjustable level. The system
cleans both vapor and groundwater with zero contaminant discharge.
__________________________________________________________________________________
Soil Vapor
Extraction (SVE)
This service station site had ten USTs. The site was
excavated to 26 feet, but some contaminants were found in deeper
soil. Fourteen extraction wells were installed to remove the
remaining soil vapor (SVE). Each well can be used for extraction or
fresh air infiltration. Flow from each well is individually
controlled. Emissions are controlled by a thermal oxidizer with heat
recovery to reduce fuel costs.
__________________________________________________________________________________
Chlorinated
Solvents
This site has two overlapping plumes, one with petroleum from a fuel
tank and the other with chlorinated hydrocarbons from a dry cleaning
operation. The investigation of this site began with a site
assessment. This lead to the installation of monitoring wells to
assess groundwater contamination and a soil gas survey. The survey
found chlorofluorocarbons (CFCs), trichlorofluoromethane, and
dichlorodifluoromethane. This data was used to develop a site
conceptual model. Remediation of the site involves soil vapor
extraction (SVE) with air sparging in the source area and
groundwater pumping to control the plume. Contaminants are removed
from the waste streams by activated carbon.
__________________________________________________________________________________
Soil Excavation inside Building
Site was granted case closure after removing the source and
conducting groundwater sampling and analysis to prove plume
stability. TEC helped client with the Cleanup Fund application and
prepared the reimbursement requests. The cost for the remedial
action was fully recovered from the State of California Cleanup
Fund.
__________________________________________________________________________________
Soil Vapor
Survey and Site Conceptual Model
The site was an operating gasoline service station. TEC removed four
underground storage tanks (USTs) from the site. Analysis of soil
samples collected during removal of the USTs detected significant
concentrations of petroleum hydrocarbons. The impacted soil was
excavated and bio-treated onsite and returned to the excavation
after the collection confirmation sampling and proved to be suitable
for backfill. A series of soil borings and six monitoring wells
onsite and offsite defined the extent of the remaining soil and
groundwater impact with gasoline.
TEC Accutite completed a site conceptual model (SCM) and a soil
vapor survey. Based on non-detect to non-significant impact to
nearby sensitive receptor, the site was closed.
__________________________________________________________________________________
Treatment
Beds. Bioremediation
Design and construction of an impervious liner, drainage,
and treatment beds for the remediation of 10,000 cubic yards of soil
contaminated with heavy metals and volatile organic compounds.
__________________________________________________________________________________
Emergency
Response
Responded to a diesel fuel spill, caused by the over flow of a
100,000-gallon vertical tank, located within a quarter mile of the
San Francisco Bay. This emergency response included product recovery
through drilled monitoring well casings, soil and ground water
sampling and analyses, and the design of a comprehensive remediation
plan. Work was performed per the guidelines of the Code of Federal
Regulations (40 CFR 110 and 112) entitled EPA Discharge of Oil (110)
and EPA Oil Pollution Prevention (112).
__________________________________________________________________________________
Hazardous
Material Management Plan (HMMP)
Designed a Spill Prevention, Control and Countermeasure (SPCC)
Plan for the truck stop facility. The SPCC required inspection and
familiarization with the various fueling activities, design of
maintenance schedules and simplified log forms for mandated record
keeping. Facility includes vertical aboveground and underground fuel
storage tanks.
|
