GUARDIAN IN ACTION: LANDFILL REMEDIATION IN THE NORTHEAST
Guardian’s environmental consultants were recently tapped for closure responsibilities on a 50-acre, unregulated landfill that was leaking contaminants into the well field of a local water utility.
Initial site grading had just begun when buried drums were discovered. The site was temporarily shut down to investigate the drums and to prepare for any unknowns in this unique situation. Ground Penetrating Radar was selected as the technique best suited to the investigation. This method of determining anomalies in the substrate utilizes a differential in material density to identify potential objects beneath the surface.
Initial work included clearing and grubbing of the site utilizing a local subcontractor with all generated material remaining on site to reuse as organic matter in re- vegetating the site upon completion. Remediation design called for capping with layers: structural fill, geo-synthetic liner, geo-membrane drainage layer and vegetative layer.
A support zone was established with zones delineated for decontamination of personnel and equipment upon leaving the work zone. All site personnel were required to be 40-hour OSHA Hazwoper trained and special classes were conducted for local subcontractors as needed. The equipment was outfitted with bottle racks and hoses to allow for the installation of a cascade system of supplied breathing air. The area with the drums was successfully excavated with all intact drums placed in over-pack containers for sampling, analysis and ultimate disposal. This entire drum operation was conducted while the other site activities remained operational.
Strict requirements were imposed by the state regarding Erosion and Sediment control including participation in a program designed to minimize runoff from any earth disturbance location. All runoff was to be collected and discharged through sediment basins constructed at both ends of the site. In addition, a series of berms and swales were installed along the 2500 linear feet of the adjacent rail line. Structural fill to facilitate the correct shape and contour of the finished site was imported at a rate of up to 10,000 cubic yards per day. Layers above the fill included a 40 mil LDPE liner, drainage geo-net and cushioning, non-woven geotextile. Thanks to the expertise, ingenuity and efficiency of Guardian’s technical personnel, methods devised for this layered installation accelerated the project schedule and allowed for completion in one-third less time than anyone had anticipated.
ENVIRONMENTAL CASE STUDY: ABATEMENT
GUARDIAN IN ACTION: SCHOOL LEAD & ASBESTOS ABATEMENT
The installation of a fire alarm control system at a California school campus was the catalyst for Guardian’s environmental specialists to be called to the site. Preliminary investigations of the multi-use buildings, some dating to the school’s founding in 1923, revealed an immediate need for both lead and asbestos abatement.
The hazardous material abatement project included the development of the abatement design for Class IV removal of friable asbestos and abatement cost estimating, progress monitoring and site supervision during the abatement process, preparation of abatement progress reports, oversight of the visual and air sampling collection necessary for final clearance and review of the close out documentation.
Working with the Los Angeles Unified School District’s Facilities Environmental Technical Unit (“FETU”) and Office of Environmental Health and Safety (“OEHS”), Guardian’s personnel oversaw the abatement to ensure regulatory compliance.
Regulatory requirements included: State and Federal Asbestos Hazard Emergency Response Act (“AHERA”), U.S. Environmental Protection Agency (“EPA”), California Code of Regulations Construction Industry Safety Orders, and South Coast Air Quality Management District (“SCAQMD”).
When environmental concerns present themselves, Guardian’s ability to deploy immediately, get up to speed rapidly and collaborate with schools, municipalities and private businesses provides clients the confidence they need to surmount the challenges in a cost-effective manner. Our construction and project management experience ensures fair pricing, despite the situation’s urgency, and our environmental expertise helps ensure that all issues will be addressed with a focus on safety, regulatory compliance and the minimization of future disruptions.