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Structural Underpinning
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PROJECT: |
2008 - Time Of Essence Urban Site With Foundation Underpinning And Bioremediation |
SITE: |
Jersey City, Hudson County, NJ, ANCO Project #14831- RW |
CLIENT: |
Travelers Insurance |
OVERSIGHT CONSULTANT: |
None – See attached letter of recommendation |
PROJECT VALUE: |
$121,000 |
DETAILS: |
With a mortgage commitment about to expire, ANCO underwrote project financing to enable rapid job progression anticipating payment from the property transaction. Groundwater impacted with a ¼” free product layer was encountered at 11’ thereby triggering homeowners liability coverage. ANCO deployed a FRAC tank with automatic pumps to establish hydraulic control. The plume extended from the curb to just beneath the foundation at this tight 18’ wide urban ‘walk up’. The stairway to the second floor and the sidewalk were removed to enable removal of the entire front yard. Two concrete filled sonotubes were set on bedrock and utilized to support the foundation. A down gradient sentinel well was installed to determine remedial effectiveness while oil metabolizing microbes were broadcast across the base of the excavation. ANCO backfilled then restored sidewalks and the stairway before the mortgage expiration date. |
PROJECT: |
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. |
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 - Dry Cleaners PCE Remediation With Helical Piles And SVE Technology |
SITE: |
New Providence, Union County, NJ, ANCO Project #15225-RW |
CLIENT: |
Real Estate Holding Company |
OVERSIGHT CONSULTANT: |
Environmental Liability Management (ELMI), 609-683-4848 |
PROJECT VALUE: |
$289,000 |
DETAILS: |
PCE had diffused deeply through poorly graded, water saturated unstable (95% silty) soils beneath this dry cleaning facility at a strip mall. The foundation was supported on two sides with Chance helical pull down piles set by ANCO. Four helicals were set on the inside of the building due to a 4” gas main routed along the exterior wall. Helicals were set immediately following digging a narrow section utilizing a small excavator with a quick connect coupling. This enabled simply and efficiently switching from excavator bucket to helical torque driver. Contaminated soil was excavated to a depth of 10’ below grade; 4’ deeper than the water table. Twice daily excavation dewatering coupled with soil digout and material staging was a logistic challenge while this busy mall remained open for business during the entire process. Vapor extraction piping was installed through horizontal boreholes set through the excavation sidewalls beneath adjoining businesses. SVE gasses were pumped through activated carbon drums through plumbing configured by ANCO. |
PROJECT: |
2008 - Deep Oil Penetration Through Coarse Sand At Tight Urban Site |
SITE: |
Summit, Union County, NJ, ANCO Project #14976-RW |
CLIENT: |
American Legion Post |
OVERSIGHT CONSULTANT: |
None – See attached letter of recommendation |
PROJECT VALUE: |
$54,000 |
DETAILS: |
With a pending real estate transaction set to expire, timely and effective job progression was paramount. The 1,000-gallon active leaking underground oil tank had been set inside and old cistern, with a leaky bottom. The soil type to the 21’ dig depth was coarse sand, so oil had an unimpeded pathway along foundations to a point at least 4’ deeper than the adjacent building footings. ANCO Geoprobed to 26’, and the next day a wellpoint failed to reveal water. Steel sheet shoring was driven to protect the neighboring building foundation. ANCO removed a fire escape and temporarily supported a three-story porch during construction. 83 tons of oil saturated contaminated soil were excavated. Total cleanup cost $54,000. Client satisfaction level: Ecstatic. |
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. |
PROEJCT: |
2007 - Highlands Region, Site Remediation With High Water Table And Some Structural Support |
SITE: |
Netcong Boro, Sussex County, NJ, ANCO Project #14363-RW |
CLIENT: |
One Beacon Insurance Company and Homeowner |
OVERSIGHT CONSULTANT: |
Environmental Controls and Compliance Inc., 973-989-8010 |
PROJECT VALUE: |
$47,000 |
DETAILS: |
Following the tank removal (by another company) the client’s attorney recommended ANCO environmental to finance and undertake the remediation. A high water table condition was observed on the first day of remediation work. Working with the homeowner’s insurance carrier, ANCO was able to quickly demonstrate that water in the excavation was truly groundwater, and that it was impacted. This was instrumental in terms of moving forward, for the client lacked adequate equity in the house to qualify for 100% ANCO financing. ANCO proceeded with the cleanup, which developed into a structural support project. A 4’ thick smear zone extended beneath the foundation, below which large boulders were encountered. This was fortuitous, enabling use of the relatively inexpensive jack post piles structural support system. Following contaminated soil removal, ANCO constructed a concrete block foundation directly on bedrock. ANCO obtained the NFA letter within eight (8) months of the start date. |
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: |
2005 - Bioremediation For Commingled Contamination Sources In Very Tight Urban Setting |
SITE: |
Hoboken, Hudson County, NJ, ANCO Project #10622-RW |
CLIENT: |
Chubb Insurance |
OVERSIGHT CONSULTANT |
Baron, Rana, Uhl and Associates, 609-397-9161 |
PROJECT VALUE: |
$143,000 |
DETAILS: |
Oil contamination from leaking UST commingled with oil from a neighbor's leaking UST. A pneumatically controlled free product skimming system was installed to remove the 9" floating free product layer. This was followed by use of a peatwick absorbent system. Weekly, the biweekly, then monthly peatwick element change-outs satisfied NJDEP corrective measure implementation requirements yet limited treatment to small area without influencing/disturbing nearby plumes. While alternative remedial approaches (i.e., EFR or pump & treat) would have more quickly remediated the site, project duration was less a factor than exceeding policy limits, therefore this approach was deemed the most viable until the third year when the homeowner became impatient. ANCO then obtained a permit-by-rule for the application of oil metabolizing microbes and surfactants. The excavation was reopened, environmental damages caused by the neighboring tank were sequestered and assessed and the site was restored to its original condition. NFA was issued in October 2008. |
PROJECT: |
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. |