3001-3035 White Plains Road, Bronx, NY 10467

Bronxwood

Brownfield SVOCs VOCs CVOCs "Vapor Intrusion" SSDS

Dico G Associates, Inc.
Site Description[1] 
This site is approximately 0.52 acres in size located on Block 4545 Lots 1001 and 1002 (formerly Lot 14) designated by the New York City Department of Assessment. The site is improved with a single-story masonry building with 3 service bays. The property is surrounded by a 6-foot high chain link fence, which bisects the site just north of the service station building. The properly is surrounded by a mix of residential and commercial properties. Commercial business, mostly retail, located along White Plains Road while residential areas are located behind (east-west) the commercial corridor. An elevated section of the metro-north Railway passes in front of the property, directly over White Plains Road This property was formerly utilized as a gas station (from 1960 to 1999), surface parking lot and most recently as an auto repair shop (1960 to present) and a junkyard. This site has an open spill number 99-00851 related to soil contamination discovered during underground storage tank removal in 1999. The site also had improper storage of hazardous and non-hazardous materials, including gasoline, fuel oil, automotive fluids and solvents. A preliminary subsurface investigation was conducted on January 2007. Remedial Investigation was conducted in November 2007 and identified soil and groundwater contamination. The VOCs in the soil samples that exceeded Track 1 Cleanup Criteria included xylenes, benzene, acetone and isopropylbenzene. Elevated SVOCs (benzo(a)anthracene, chrysene, naphthalene and benzo(b)flouranthene) were reported in all soil borings. Some pesticides were also identified in soil samples. The VOCs in the groundwater (9 of the 15 wells sample) exceeded for gasoline related compounds. SVOCs including benzo(a)anthracene, phthalates and naphthalene were detected at concentration above water quality standards. An IRM conducted in 2008 consisted of the excavation and disposal of impacted soil associated with former underground storage tanks and dispenser areas, and 2 rounds of chemical oxidation (persulfate) injections. Additional non-impacted soil and bedrock were removed that were necessary for new building construction. The Site is currently being developed with the new construction of a multifamily residential building with approximately 11,000 sf of ground floor commercial space. The building will include a basement level and first floor parking garage. This site has been determined not to pose a significant threat to the environment or public health. DEC and DOH have made this determination based on the RI Report dated September 2008. The Remedial Action Work Plan (RAWP) calls for continued chemical oxidant treatment and LNAPL recovery to achieve groundwater quality that is protective of the environment and the public health. In addition, the proposed development will incorporate a sub-slab depressurization system as well as a vapor barrier to ensure future occupants will not be exposed to residual contamination. The Site is pursuing for a Conditional Track 1 Cleanup with a minimum of 5 years of post-remedial groundwater monitoring. If groundwater does not meet applicable standards in the specified time period, the COC can be revoked and the Site will be changed to restricted residential use only. The SMP will have a provision for both ORC injections and LNAPL recovery. The remaining portion of the remedy will be completed under the SMP. A Certificate of Completion was issued to the Applicant on 12/31/08.
Site Environmental Assessment
A preliminary subsurface investigation was done in January 2007 and a Remedial Investigation (RI) was conducted in November 2007. The RI identified VOCs, SVOCs, pesticides, and metals in soil; VOCs, SVOCs, and metals in groundwater; and VOCs in soil gas. In soil samples, VOCs detected at concentrations above Track 1 cleanup objectives included: benzene (290 ug/kg), ethylbenzene (58,000 ug/kg), toluene (75,000 ug/kg), and o-xylene (230,000 ug/kg). SVOCs detected above unrestricted SCOs included: benzo(a)anthracene (1,900 ug/kg), benzo(a)pyrene (1,800 ug/kg), and chrysene (2,100 ug/kg). In addition, pesticides such as 4,4-DDT (240 ug/kg) and endrin (31 ug/kg) exceeded guidelines. Metals including lead (676 mg/kg), cadmium (3.1 mg/kg), and chromium (47.2 mg/kg) were detected at levels exceeding Track 1. In groundwater samples, VOCs compounds were detected above their respective groundwater standard in 9 of the 15 wells. Total VOC concentrations ranged from 4 ug/L in MW-11 to 13,772 ug/L in MW-15. benzene (160 ug/L), ethylbenzene (200 ug/L), toluene (170 ug/L), and o-xylene (130 ug/L), exceeded TOGS. SVOCs such as benzo(a)anthracene (0.4 ug/L), bis(s-ethylhexy)phthalate (9.1 ug/L), and naphthalene (250 ug/L) were detected above standards. In addition, exceedances of metals included barium (758 mg/L), manganese (6,210 mg/L), and magnesium (45,900 mg/L). In soil gas samples, VOC compounds that were detected included both gasoline-related and chlorinated solvents. Total VOCs ranged in concentration of 346 ug/m3 to 7,120 ug/m3. PCE were detected in all samples that range from 8.1 ug/m3 to 517 ug/m3. An IRM completed in September 2008 consisted of excavation and disposal of impacted soil, associated with the former UST and dispenser areas, and non-impacted soil and bedrock, as necessary, for the construction of a basement level parking garage, support footing and foundation slab. A total of 10,537.98 ton of non-hazardous overburden soil was shipped to facilities for disposal. The IRM also initiated the application of chemical oxidants in the former dispenser areas of the site, for the treatment of residual gasoline contamination in groundwater. The proposed remedy consists of the continuation of chemical oxidant injections initiated under the IRM, to further reduce VOC concentrations in groundwater at the site. A provision for LNAPL recovery is also included to target any free product found inside the wells on-site. The entire site will also be covered by a buildings. Both DEC and DOH have determined that this site does not pose a significant threat to either public health or the environment based on the RI Report dated September 2008. The Site is pursuing for a Conditional Track 1 Cleanup with a minimum of 5 years of post-remedial groundwater monitoring. If groundwater does not meet applicable standards in the specified time period, the COC can be revoked and the Site will be changed to restricted residential use only. The SMP will have a provision for both ORC injections and LNAPL recovery. The specifics of the ORC injections and LNAPL recovery are detailed in the SMP. A Certificate of Completion was issued to the Applicant on 12/31/08.

Site Health Assessment
Exposure to contaminated soil is not expected since it is covered with two feet of soil and secured with a chain link fence. Exposures via the soil vapor intrusion pathway within the proposed structure will be prevented with the installation of a sub-slab vapor barrier and an active sub-slab depressurization system.

Contaminants of Concern
Type of Waste Quantity
1,1,1,2-TETRACHLOROETHANE UNKNOWN
1,1,1-TRICHLOROETHANE UNKNOWN
ACETONE UNKNOWN
BARIUM UNKNOWN
BENZ(A)ANTHRACENE UNKNOWN
BENZENE UNKNOWN
BENZO(A)PYRENE UNKNOWN
BENZO(B)FLUORANTHENE UNKNOWN
BIS(2-ETHYLHEXYL)PHTHALATE UNKNOWN
CADMIUM UNKNOWN
CHROMIUM UNKNOWN
Chrysene UNKNOWN
ENDRIN UNKNOWN
ETHYLBENZENE UNKNOWN
LEAD UNKNOWN
MAGNESIUM UNKNOWN
MANGANESE UNKNOWN
NAPHTHALENE UNKNOWN
TETRACHLOROETHYLENE (PCE) UNKNOWN
TOLUENE UNKNOWN
XYLENE (MIXED) UNKNOWN
ZINC UNKNOWN

admin, Debra Hall

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