JOB: #48

2008 - Multiple Insurance Companies Third Party Liability LUST Remediation

SITE:

Bogota, Bergen County, NJ, ANCO Project #15029-RW

CLIENT:

Farm Family Insurance and Peerless Insurance

OVERSIGHT CONSULTANTS:

First Environment, 973-334-0003 and ECC Horizon, 973-989-8010

PROJECT VALUE:

$140,000

DETAILS:

The badly leaking 550-gallon UST was removed by another company in the Spring of 2008.  The homeowner had no available funds, yet one insurance carrier indicated a willingness to cover 25% of project costs following groundwater impact confirmation by First Environment.  ANCO provided project funding with zero outlay by the homeowner.  Soil lithology included a coarse sand lens at the water table interface, enabling transport of contaminant over the 50’ distance to the property line.  Leading edge plume forensic dating revealed the leak started ten years prior to discovery. This brought in Peerless Insurance and opened the subrogation claim. ANCO handled all aspects of remediation, delineation, and groundwater investigation leaving the consultants to gather information and interpret data then recommend proportional contribution.

JOB: #49

2008 - Groundwater Remediation With Helical Piles And In-site Chemical Oxidation

SITE:

Newark, Essex County, NJ, ANCO Project #15307-RW

CLIENT:

NJ Manufacturers Insurance

OVERSIGHT CONSULTANT:

Phoenix Consulting Group, 610-935-3527

PROJECT VALUE:

$58,000

DETAILS:

ANCO removed this leaking oil tank in the Spring of 2008.  Following soil and groundwater contamination delineation performed by Phoenix, a structural underpinning plan involving mini piles was designed and approved by NJM, however, the homeowner was not comfortable with the approach. ANCO suggested a modified digout approach plus in-situ remediation techniques.  This involved the installation of 30-slot horizontal piping, backfilled with ¾” gravel followed by injection of Regenesis ORC to finish the job via chemical oxidation.  While the modified digout still extended 6’ beneath the house, ANCO simply advanced two Chance pull down piles to support the 12’ exposed foundation span.  Soil disposal totaled 90 tons, but a light oil sheen was clearly visible on groundwater.  ANCO added the two part RegenOx product prior to backfilling.  Following backfill and surface restoration an ATV drill rig was deployed to install two permitted wells.  A final application of Regensis ORC advanced was injected at 20 psi through the piping to flood the Vadose Zone. Groundwater sampling (performed by Phoenix) results are pending.

JOB: #51

2008 - Overpressurized Tank Rupture In Basement

SITE:

High Bridge, Hunterdon County, NJ, ANCO Project #15475-RW

CLIENT:

Homeowner, Travelers Insurance and Petro

PROJECT VALUE:

$44,000

DETAILS:

Oil had streamed from a burst seam on the characteristically deformed (due to excessive internal pressure) 275-gallon oil tank.  Even though the homeowner was in the house during the delivery, the tank lost 40+ gallons which quickly flooded the finished basement carpeting, then flowed beneath the concrete slab through unprotected French drains.  ANCO first cut, then jackhammered and removed the concrete floor.  Impacted soils were moved by conveyor through an opening cut into the block foundation.  The homeowner stayed with family members as inside air was unbearably contaminated.  Utilizing carbon air scrubbers together with an ozone generator and “unsmoke” foggers, ANCO purified the air within the first floor living area.  A negative air containment system was installed for controlling and redirecting basement air.  The air ducts were ozoned and sanitized and every carpeted and fabric surface in the house was steam cleaned.  Sub slab clay based soils greatly help limit the spread of the oil. The entire project was competed within two weeks with acceptable final air clearance tests, following two weeks later. 

JOB: #42

2007 - Luxury Residence Basement Oil Line Rupture  With Sub Slab Impact

SITE:

Boonton Township, Morris County, NJ, ANCO Project #13914-RW

CLIENT:

Utica Insurance

OVERSIGHT CONSULTANT:

ENSR, 978-589-3012

PROJECT VALUE:

$188,000

DETAILS:

Brought in directly by the fuel oil dealer, ANCO responded to an oil line rupture where about 60 gallons leaked onto the utility room floor, then flowed beneath the ‘floating’ concrete floor slab.  The water table was only 8” beneath the slab, therefore the oil was quickly carried beneath half the basement floor area through the sub slab gravel.  ANCO opened a series of pits and recovery troughs, then, by injecting steam with surfactants, the oil was sparged from the gravel.  Two groundwater circulation systems were then installed, where water from the interceptor trenches was pumped through activated carbon then re-injected into holes drilled through the up gradient side of the basement floor.  Oil metabolizing microbes were added prior to backfilling.  The home had been outfitted with a radon remediation system, which was utilized and modified to polish remaining sub slab soil gas.  The air pump output was directed through 55-gallon drums of carbon before discharging to the atmosphere.  Groundwater quality and final indoor air clearance tests returned below limits within six months of the spill resulting in a recent NFA letter by the NJDEP.

JOB: #37

2006 - Sub Slab Oil Line Leak After Misdiagnosis Of Faulty Underground Oil Tank

SITE:

Carteret, Middlesex County, NJ, ANCO Project #13529-RW

CLIENT:

Preferred Mutual Insurance and Harleysville Insurance Company

OVERSIGHT CONSULTANT

Aegis Engineering, Rockland, Mass 781-982-4008

PROJECT VALUE:

$162,000

DETAILS:

Following the hook up of a new basement oil tank to the “wrong set” of oil lines, the homeowner reported loosing 200 gallons of oil overnight.  The house became uninhabitable during the cleanup, which involved tunneling beneath the basement floor through an excavation made in the front yard.  Conveyors were utilized to lift contaminated soil directly into waiting trucks.  Alternating 4’ foundation sections were dug out, sampled, then repoured with concrete.  New footings, floor slab, foundation and heating system completed the site restoration, all by ANCO crews.  Groundwater was found to be affected which triggered homeowner liability coverage.  The tank installer’s insurance carrier shouldered a portion of the cost, and the remainder was submitted to the NJDEP leaking tank fund, for as it turned out, the underground tank was the cause of the no heat problem in the first place.  ANCO funded the $168,000 project which took two years of expert investigation, forensic analysis and reports to understand before the battling insurance companies could agree on contribution portionality.

JOB: #31

2005 - Foundation Underpinning With Sectional Concrete Piers for Soil And Groundwater Remediation
beneath foundation involving deck reconstruction

SITE:

Montville, Morris County, NJ, ANCO Project #10340-RW

CLIENT:

NJ Manufacturers Insurance

OVERSIGHT CONSULTANT

EnviroClaims, 908-852-4800

PROJECT VALUE:

$207,000

DETAILS:

A badly leaking oil tank located beneath a large deck and a shed impacted shallow groundwater directing oil flow along the foundation, beneath the house and under the driveway. The deck was removed and the worst contamination was dug out with dewatering and hydraulic control over underlying groundwater. The house was sectionally underpinned, the trenches dug out, then quickly concrete filled in wide sections. Oil metabolizing microbes were utilized to finish off trace amount of residual petroleum. Floor slab, driveway and foundation drain replacement were all included in the site restoration phase. ANCO also rebuilt the 12'x16' second floor deck with full stairway, utilizing ANCO carpenters. 

JOB: #30

2004 - Structural Underpinning Leaking Oil Tank Site With Soil And Groundwater Remediation

SITE:

Edison Township, Middlesex County, NJ, ANCO Project #10123-RW

CLIENT:

Traveler's Insurance

OVERSIGHT CONSULTANT:

None, though delineation mapping by ECC, 973-989-8010

PROJECT VALUE:

$166,000

DETAILS:

ANCO removed the oil tank from beneath the addition foundation. Oil migration, spread by shallow groundwater, was mapped by others and was confirmed to lie along the footing of the original structure, requiring undermining the entire addition. ANCO installed large I beams and, utilizing house jacks, supported the addition on temporary footings and columns that extended beyond the building footprint.  Three monitor wells were set around the excavation, however slight exceedences indicated the need for further remediation.  A series of Enhanced Fluid Recovery events were performed.  Groundwater monitoring the returned with non-actionable contamination levels. ANCO installed new footings and foundation, and restored the site to its original condition. 

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