The Site consists of one tax parcel - block 4574 lot 225. The Site is reported to be .25 acres in area, and the entire tax lot is the subject site of the application to the BCP. The street address provided for the Site is 904 Burke Avenue, Bronx, NY 10469. The Site previously contained ten (550-gallon) gasoline underground storage tanks (USTs) and one (100-gallon) waste oil UST which were removed from the Site in December 1998. There is one commercial building onsite, covering approximately 1587 sq ft of the total site area.Site Environmental Assessment
285 tons of petroleum contaminated soil from the former UST location was excavated when ten (550-gallon) gasoline USTs were removed in December 1998. During excavation activities bedrock was encountered at approximately 6' below grade. Four endpoint soil samples were collected at the bedrock soil interface, analyzed for VOCs, and showed only minor exceedences of benzene. A test pit was excavated to visually inspect bedrock for the presence of slope and fractures and collecting endpoint samples from each wall at the bedrock interface. The test pit was located in the area of the former dispenser island. The bedrock had no visible slope or fractures. Five endpoint soil samples were collected consisting of four sidewall and one bottom sample. Soil analyticals showed concentrations up to 5500ppb benzene, 120000ppb toluene, 57000ppb ethylbenzene and 240000ppb xylene. No groundwater was encountered during the investigation. Three monitoring wells required by the Department was installed at the site. No soil samples were submitted for laboratory analysis however field screening results of soil samples indicated PID readings up to 748ppb. Approximately 0.1' of free product was detected in one of the three monitoring wells. Groundwater samples were collected from the wells which did not contain free product. Dissolved phase groundwater contamination was detected up to 290ppb benzene, 330ppb toluene, 260ppb ethylbenzene, 3000ppb xylene and 310ppb MTBE. Interim remedial measures were implemented to recover free product in up to two of three onsite monitoring wells. In July 2004, 0.1" of free product was detected in MW2 and less than 1.0" was detected in MW3 and a total of 60 gallons of product/water mix was recovered via vacuum truck. In August 2004, 1.0" of product was detected in MW2 and less than 1.0" was detected in MW3 and a total of 40 gallons of product/water mix was recovered via manual bailing. In October 2004, 0.1" of product was detected in MW2 and .01" was detected in MW3 and a total of 46 gallons of product/water mix was recovered via manual bailing. In November 2004, no free product was encountered onsite and a total of 44 gallons of water was recovered via manual bailing. In January 2005, no free product was encountered onsite and a total of 38 gallons of water was recovered via manual bailing. On March 16, 2006, a final version of the Citizen Participation Plan (CPP) was submitted by the volunteer. DEC approved it on March 27, 2006. On April 7, 2006, Interim Remedial Measure (IRM)Work Plan was submitted by the volunteer. DEC approved IRM on July 24, 2006. In April 2006, a total of 44 gallons of water and product mix was bailed from MW-2 and MW-3. On October 30, 2006, a letter from DEC was sent to the volunteer. The letter stated that the volunteer significantly delayed submittal of the Fact Sheet, Investigative Work Plan and Progress Reports. DEC required that the necessary documentation should submitted to DEC with strict deadlines for the deliverables. In January 2007 the applicant submitted a Fact Sheet for IRM which is under review by DEC and NYSDOH. Excavation of the contaminated material was performed, as part of IRM, on November 30 and December 1, 2006. End point samples were taken. A status report on IRM activities was submitted to DEC on January 30, 2007. A fact sheet describing IRM activities was issued and distributed in February 2007. In September 2007, the applicant submitted analytical data for the material that he intended to use as the backfill soil at the project site. An e-mail was sent to the applicant stating that some of the contaminants (several SVOCs and metals) are detected at concentrations exceeding State Recommended Soil Cleanup Objective Values as specified in TAGM 4046 or in Table 375-6.8 in 6NYCRR Part 375, effective December 16, 2006. It was stated in the e-mail that if the applicant is pursuing Track 4 Cleanup (which involves engineering and institution controls, for example: capping/covering the site, filing environmental easement in County Clerk's Office) for this project, this soil is acceptable for the purpose of backfill. However, if the applicant is pursuing Track 1 (unrestricted use), these exceedances are inconsistent with Track 1 cleanup objectives. Based on the above, staff recommended that the applicant find alternative source of clean soil which meets both TAGM 4046 and 375-6.8 cleanup objectives. In October 2007 Staff approved backfill material stating that Track 4 cleanup might be suitable for this site due to the content of the material. Also, staff recommended PE evaluation the backfill material. On December 14, 2007, Staff approved Revised Remedial Investigation Work Plan. April 11-22, 2008. On-site wells installed and on-site samples collected. 7-17-2008 Soil gas samples were collected. 11-24-2008 Three new monitoring wells were installed on-site. Groundwater results indicate elevated levels of VOCs and SVOCs in groundwater. Metals at elevated levels were also detected in the on-site soil samples. Four soil vapor probes have also been taken. Three of four soil vapor probes exhibited elevated levels of benzene, 1,2,3-trimethylbenezene, and toluene. Petroleum sheen was observed in one of the on-site wells. Installation of the off-site wells was delayed due to neighbor's objections, difficult geological and site conditions. 12-16-2008 12-16-2008 A meeting between NYSDEC (V. Brevdo & A. Zhitomirsky), owner's representative (Rich Durgin), consultants and drilling company was held at the site. DEC required installation of the off-site wells and completion of the Report. The owner’s representative agreed.
Site Health Assessment
On-site soils and groundwater are contaminated with petroleum-related contaminants. The site is paved; therefore, direct contact exposure is not expected. The area is served with public water; therefore, ingestion exposure is not expected. Assessment of the potential for inhalation exposures via vapor intrusion will be conducted during the remedial investigation.