3536 Pear Tree Avenue, Bronx, NY 10475

Edenwald

Superfund VOCs CVOCs "Vapor Intrusion"

Louis Wiener, Hexagon Laboratories, Holchem Limited, and Pharma Investment Limited
Site Description[1] 
Hexagon Laboratories, Inc. is located in the Northeast Bronx, south of Boston Post Road, north of the New England section of the Thruway and west of the Hutchinson River in an area close to both industrial and residential buildings. Hexagon Laboratories operated as a chemical manufacturing facility that stored and produced a number of compounds and chemicals, medicinal and pharmaceutical, for industrial and commercial use until 1988. There were a total of 30 USTs that were installed between 1956 and 1978. The tanks, which have been removed, were used for storage of several organic and inorganic acids, halogenated solvents, including: alcohols, naphtha, benzene, toluene, and methylene chloride. The plant had a history of chemical spillage; seven of these tanks failed tank integrity tests in 1977. Extensive groundwater contamination exists under and around the facility; a fifteen foot layer of hydrocarbons was found in an on-site well in 1987. Over one hundred drums were found abandoned on-site during an inspection in 1991. A State Funded Phase I (PSA) was completed in 1993. EPA conducted an emergency removal action that included sampling, removal of drums and removal of other laboratory chemicals and packs from the property. The DEC completed a Remedial Investigation/Feasibility Study (RI/FS). The site was divided into operable units OU1-soil and OU2-groundwater. The initial phase of the RI showed some of the buildings to be structurally unsound. Interim remedial measures (IRMs) consisting of asbestos removal, building demolition, and subsurface tank removal were completed in December 1997. The RI/FS for OU1 was completed in May 1999 and the ROD was signed in February 2000. The remedy calls for soil excavation to bedrock or the watertable. The OU2 RI/FS has been completed and the ROD was signed in July 2002. The Responsible Parties will implement the remedies under Consent Decrees negotiated by the NYS Attorney General's Office. The OU1 soil removal remedy was completed in January 2006. The Final Engineering Report for the OU1 remedy was approved in September 2006. The OU2 remedy has commenced (fall 2007) and will be completed under the State Superfund program.

Site Environmental Assessment
Both on-site soils and groundwater were contaminated with a number of organic and inorganic contaminants. Most of the overburden was removed from the site as part of the remedy. Groundwater cleanup has begun. There are no known users of groundwater in this area.

Site Health Assessment
Soils contaminated with volatile organic compounds (VOCs) have been excavated to bedrock across most of the site and disposed of properly eliminating the potential for exposure. Groundwater will be remediated using chemical oxidation. Although groundwater is contaminated with VOCs, the area surrounding the site is served by public water. Therefore, exposure to contaminated groundwater is not expected.

Contaminants of Concern
Type of Waste Quantity
1,1,1 TCA UNKNOWN
1,1-DICHLOROETHANE UNKNOWN
1,2-DICHLOROBENZENE UNKNOWN
1,2-DICHLOROETHANE UNKNOWN
ACETONE UNKNOWN
ALCOHOLS UNKNOWN
BENZENE UNKNOWN
BENZO(A)PYRENE UNKNOWN
BENZO(B)FLUORANTHENE UNKNOWN
CHLOROBENZENE UNKNOWN
CHLOROETHANE UNKNOWN
CHLOROFORM UNKNOWN
ETHYLBENZENE UNKNOWN
HALOGENS UNKNOWN
METHYLENE CHLORIDE UNKNOWN
NAPHTHA UNKNOWN
ORGANIC AND INORGANIC ACIDS UNKNOWN
PHENOL UNKNOWN
POLYCHLORINATED BIPHENYLS (PCB) UNKNOWN
TETRACHLOROETHYLENE (PCE) UNKNOWN
TOLUENE UNKNOWN
TRICHLOROETHENE (TCE) UNKNOWN
VINYL CHLORIDE UNKNOWN
XYLENE (MIXED) UNKNOWN

admin, Debra Hall

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