 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
Vapor Intrusion Remediation, Basement Tank Leaks/Line Ruptures
|
|
PROJECT: |
2008 - Degraded #2 Fuel Spill Cleanup In Basement |
SITE: |
Watchung, Somerset County, NJ, ANCO Project #14692 RW |
CLIENT: |
Chubb Insurance |
OVERSIGHT CONSULTANT |
None |
PROJECT VALUE: |
$275,000 |
DETAILS: |
This 275-gallon tank had burst and was replaced 10 years prior to the call for help. Discovery and reporting to the NJDEP was delayed due to evidence cover-up. The homeowner at the time had simply poured a concrete pad over the spill. When the new owner sought to finish his basement, the old spill was discovered. By then, the oil had seeped 8’ beneath the floor and diffused beneath most of the basement. A conveying system was installed through the outside block wall to carry hand dug soils from beneath the house to waiting trucks. Poured sectional concrete piers were utilized as the most cost effective foundation support method for interior load bearing walls. The excavation was backfilled with ¾” gravel, and then several hundred feet of 3” diameter perforated piping was installed. A 1,000 CFM sub slab air pump was installed and the output was directed through dual 55-gallon activated carbon drums. This system will remain operational until airborne volatile organic compound levels fall below applicable NJDEP screening levels. Final air clearance tests on the first and second floors are within compliance limits. ANCO restored the basement floor slab, cleaned air ducts with ozone and “unsmoke” foggers and wiped every surface clean of petroleum residue. |
PROJECT: |
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. |
PROJECT: |
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. |
PROJECT: |
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. |
PROJECT: |
2005 - Foundation Underpinning With Sectional Concrete Piers for Soil And Groundwater Remediation |
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. |
PROJECT: |
2000 - Crawl Space Fuel Oil Release Emergency Response |
SITE: |
Port Murray, Warren County, NJ, ANCO Project #8355-RW |
CLIENT: |
State Farm Insurance Company |
PROJECT VALUE: |
$28,000 |
DETAILS: |
Coordinated the remediation of soil and groundwater following the release of #2 fuel oil in the crawlspace of a private residence. Completed remedial investigative activities involving the installation of borings and the acquisition of solid and groundwater samples. Designed and implemented labor intensive soil remediation via hand dug product recovery trenches, biological treatment and Enhanced Fluid Recovery. Completed remedial efforts that required reporting requirements in a timely manner to secure property closing schedule |
|
|