PROJECT:

2009 – Historic Gasoline Service Station Underground Storage Tank (UST) Rupture Effecting Municipal Redevelopment Project

SITE:

Tenafly Borough, Bergen County, NJ, ANCO Project #15523-RW

PROJECT VALUE:

$120,000

CLIENT:

East Edge LLC & Tenafly Borough

DETAILS:

A catastrophic release of approximately 4,000 gallons of unleaded gasoline occurred onsite in July of 1994. A hole was discovered through the invert at the strike plate location of the 8,000 gallon fiberglass premium grade gasoline UST. The Borough of Tenafly sought to acquire the property to develop into a small park. ANCO was hired in early 2009, displacing earlier consultants who still had not completed three dimensional source delineation across the entire site. ANCO responded with two geoprobe units and continuously sampled soils to vertically and horizontally delineate the petroleum hydrocarbons in the soil including liquid- and residual-phase gasoline and diesel fuel which was encountered in a smear 3 one extending 8’ into the water table. The remaining contaminant source was excavated, 200 tons of soil were treated off-site, and post-excavation soil sampling showed the soil impact was removed to the most stringent soil criteria. Next, an array of temporary wells was installed and sampled to screen the dissolved contaminant plume. Additional water-table and vertical extent monitoring wells were installed in two episodes, on- and off-site, and sampled to delineate the dissolved plume geometry. Chemical oxidation agent was injected to speed remediation of remaining contaminants. Hydraulic slug testing was conducted and a CEA was calculated. A down gradient sentinel well was installed, sampled and found to be clean. Active site remediation is completed, pending an approved CEA/NFA letter from the NJDEP.

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:

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:

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. 

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:

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

Back to the top