1296 Sheridan Avenue, Bronx, NY, 10456

Mt. Eden

Superfund VOCs "Vapor Intrusion" CVOCs

1296 Sheridan Assoc, LLC
Site Description[1] 
The site once housed a dry cleaning facility 20 x 40 feet in dimensions. The underlying soil was contaminated with the solvent perchloroethylene (PCE). Soil sampling indicated that most of this contamination existed in the shallow soils (two to six feet below ground surface) where concentrations of PCE were detected at a maximum of 21,000 ug/kg (ppb). TAGM 4046 exceedances were detected to as deep as 15' bgs and nine out of sixteen samples taken revealed such exceedances. A Soil Vapor Extraction System was installed and put in operation in June 1998 and operated until June 2000. Confirmatory effluent samples from the SVE system indicated a decrease in the concentration of PCE from a high of 250,000 ug/m3 at the time of start up to an asymptotic level of 306 ug/m3 two years later. Soil end sampling done in June 2000 revealed mostly non-detects and a maximum concentration of PCE of 94 ug/kg. There were no TAGM exceedances. The SVE system was shutdown in June 2000. The property was subsequently redeveloped as a Chinese takeout restaurant. Four rounds of indoor air sampling were conducted at the site. NYSDOH has requested sub-slab vapor testing but the owner was resistant to this because of the recent construction. The site was placed on the list of legacy sites because of the concern for potential soil vapor intrusion from the residual contamination. A Soil Vapor Intrusion (SVI) Evaluation Work Plan was submitted on October 8, 2007 and finally approved on November 28, 2007. The proposed sampling as described in the SVI Evaluation Work Plan was conducted on March 6, 2008. The report detailing the results was submitted on April 16, 2008. Based on these results and prior results from indoor air sampling and soil end point sampling, NYSDOH issued a letter dated June 10, 2008 stating that no further action was necessary. NYSDEC then issued a No Futher Action Letter to the ownwer/RP on July 24, 2008. An IRM Report approval letter was issued by the department on September 3, 2008.

Site Environmental Assessment
The consultant for the owner had requested a No Further Action determination from the Department in October 2000. However, the NYSDOH did not concur and requested that four rounds of indoor air sampling be done before any determination was made. The fourth round was completed and the report submitted on April 5, 2007. The results for tetrachloroethylene (PCE) were below NYSDOH air guideline of 100 ug/cubic meter and NYSDOH/EPA databases for indoor air. The site was then placed on the list of legacy sites. The consultant FPM submitted a proposal to do Sub-slab soil vapor sampling using an alternate location to that stated in NYSDOH guidance for soil vapor intrusion. This was reviewed by NYSDOH. Following discussion between the consultant, FPM, NYSDOH and NYSDEC, a revised Soil Vapor Intrusion Evaluation Work Plan was submitted on October 8, 2007 and finally approved on November 28, 2007 with the stipulation that if any tetrachloroethene (PCE) was detected in any of the soil vapor samples planned, NYSDEC and NYSDOH would request that sub-slab soil vapor along with concurrent indoor and outdoor air sampling be performed at the site proper. The proposed sampling as described in the SVI Evaluation Work Plan was conducted on March 6, 2008. The report detailing the results was submitted on April 16, 2008. Based on these results and prior results from indoor air sampling and soil end point sampling, NYSDOH issued a letter dated June 10, 2008 stating that no further action was necessary. NYSDEC then issued a No Futher Action Letter to the ownwer/RP on July 24, 2008. An IRM Report approval letter was issued by the department on September 3, 2008.

Site Health Assessment
Soil and soil vapor are contaminated with tetrachloroethene and its breakdown products. A soil vapor extraction system operated on-site from June 1998 to June 2000. Following shutdown of the system, soil samples showed levels of contaminants were below the recommended soil cleanup objectives. Also, indoor air sampling results indicate that contaminant levels are below concentrations that would represent a health concern.

Contaminants of Concern
Type of Waste Quantity
TETRACHLOROETHYLENE (PCE) UNKNOWN

admin, Debra Hall

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