Results

A few highlights of what we have achieved and our successes over the last few years:

 

Soil Vapor Intrusion Study – Brooklyn, NY

Prepared by Kevin Taylor

In early 2012, IES conducted a Vapor Intrusion Investigation on a property in Brooklyn.  The investigation was required by the New York City Department of Environmental Protection (NYCDEP) and the New York State Department of Health (NYSDOH) since the property owner was seeking a zoning variance from industrial to residential.  An Investigative Protocol/Work Plan summarizing the proposed sub-slab vapor and indoor air samples; and Health and Safety Plan (HASP) was developed by IES and approved by the NYCDEP.

As part of the investigation,  four temporary sub-slab vapor probes and eight air samples were collected utilizing SUMMA canisters and regulators;  as outlined in the “New York State Department of Health Bureau of Environmental Expose Investigation, October 2006 Guidance for Evaluating Soil Vapor Intrusion in the State of New York”. Based upon the analytical results, IES recommended that a sub-surface mitigation system be installed. As such, IES designed an Active Sub-Slab Depressurization System which was accepted by the NYCDEP and NYSDOH. After the Active Sub-Slab Depressurization System was operational, IES conducted another round of sampling to ensure the system was working as designed.  The second round of sampling demonstrated the system was working as intended.

At the end of the project IES received a recommendation letter from the property owner which stated “In addition to being immediately responsive to all our project needs and deadlines, IES was flexible to work with. IES defined the overall project strategy and ensure that both written and inherent NYCDEP guidelines were followed.  We would absolutely recommend IES as consultants on our future projects.”

Automobile Dealership Complex – West Roxbury, MA

In August of 2007, IES identified a “72 Hour” reporting condition (>½ inch of separate-phase product) at an automobile dealership in West Roxbury, MA.  Due to this release, initial response actions were performed as an “Immediate Response Action” (IRA), which consisted of the excavation and removal of 345.29 tons of waste oil-contaminated soil; the pumping of 9,966 gallons of waste oil contaminated groundwater during the soil excavation activities; and the installation of three, 24” recovery wells.

Following the completion of the IRA, additional response actions were conducted at the site as part of a “Release Abatement Measure” (RAM).  In order to proceed with the RAM, a NPDES permit for the discharge of treated groundwater was obtained in January of 2008; and the RAM excavation activities commenced in February of 2008.  During excavation activities, de-watering was performed under the aforementioned NPDES permit utilizing three, 20,000-gallon frac tanks; and a vacuum truck was also present during excavation activities in order to skim oil from the excavation and from recovery wells which were installed at the site under a previous IRA; and also from additional recovery wells installed during the RAM excavation activities.  A total of 2,470.81 tons of petroleum-contaminated soil was excavated and removed from the site (345.29 tons as part of the IRA, and 2,125.52 tons as part of the RAM) during Response Actions at the Disposal Site; and a total of 25,205 gallons of Non-Aqueous Phase Liquid (NAPL) was pumped from the IRA and RAM excavations during Response Actions at the site.

Following the removal of the contaminated soil and groundwater, laboratory testing of the remaining soil did not reveal the presence of any Exposure Point Concentrations (EPC’s) of EPH/VPH compounds, PAH’s, or VOC’s, above the applicable MCP Method 1 S-1/GW-2 and S-1/GW-3 Standards.  Additional assessment activities were also conducted to further document the effectiveness of the remedial activities conducted at the site, which included test borings, monitoring well installations, and soil and groundwater testing. The confirmatory testing programs indicated that the excavation, removal and off-site disposal of contaminated soil; and the pumping and off-site disposal of contaminated groundwater had reduced the contamination at the site to below the Method 1 S-1 Standards for soil and below the applicable MCP Method 1 GW-2 or GW-3 Standards for groundwater.  Therefore, a condition of “No Significant Risk” of harm to health, public welfare, and the environmental was achieved for the soil and groundwater, and as such, a Class A-2 Response Action Outcome (RAO) Statement was submitted to the DEP for this release.

Former Auto Salvage and Repair Site/Oil Distribution Facility – Somerville, MA

Prepared by Kerry Asetta

In August of 2004, IES identified petroleum, metal, and PCB contamination in the soil and groundwater at a former automobile salvage and repair shop/oil distribution facility located in Somerville, MA. In order to remediate this contamination, a Release Abatement Measure (RAM) was performed by IES in November of 2004. The RAM included the excavation of 1,714 tons of petroleum contaminated soil. In addition, 36,674 gallons of contaminated groundwater was pumped into a frac tank and subsequently transported to Clean Harbors for disposal. A total of 57 tons of PCB-contaminated soil was excavated and transported to Model City, NY; and 498 tons of petroleum contaminated soil was transported to Aggregate Recycling Eliot, ME for recycling. The remaining soil was treated/stabilized on-site in order to reduce the leachability of Lead to below Hazardous Regulatory Requirements, and was subsequently disposed of at the Waste Management facility in Rochester, NH.

 

Subsequent soil and groundwater testing was performed at the site in July of 2005, which revealed that elevated levels of Volatile Petroleum Hydrocarbons (VPH) were present in one groundwater monitoring well. In order to address this issue, a soil-gas survey was performed at the site in October of 2005. Based on the results of the soil, groundwater, and soil-gas survey results, a MCP Method 3 Risk Characterization was subsequently prepared for the site, which revealed the residual contamination remaining at the property posed “No Significant Risk” of harm to human health, public welfare, safety, and the environment under current and foreseeable site activities and uses. The RAM was successful in significantly reducing the levels of contamination in the soil and groundwater at this property, and as a result, IES submitted a Class A-2 Response Action Outcome (RAO) Statement to the DEP in November of 2005.

Historic Fill & UST Release at Former Automobile Dealership – Medford, MA

Prepared by Christopher D. Buchanan

In October of 2010, IES identified a “72-Hour” reporting condition during the removal of a 3,000-gallon fuel oil UST at a former automobile dealership in Medford, MA. DEP approved Immediate Response Action (IRA) activities including soil and groundwater testing. The IRA assessment activities identified multiple new and separate releases of oil and/or hazardous materials at the site, which triggered new DEP notification requirements that were managed under three separate Release Tracking Numbers (RTNs). The new releases identified during the IRA assessment activities included elevated levels of Arsenic, Barium, Cadmium, Hexavalent Chromium, Lead and Mercury in the soil/fill material at the site; elevated levels of VPH and EPH in site soil; and elevated levels of dissolved Lead in the groundwater at the site.

In order to remediate the fuel oil release associated with the former 3,000-gallon fuel oil UST, approximately 112 cubic yards of fuel oil contaminated soil was excavated and disposed off-site as part of the IRA. In addition, an undocumented abandoned gasoline UST was encountered in the IRA excavation, which was disposed at a licensed facility subsequent to DEP notification. The heavy metal contamination identified at the site was determined to be a result of historical fill brought to the site prior to the construction of the existing building. The second and separate petroleum related EPH and VPH contamination identified on the northerly portion of the site was determined to be from a nearby off-site release for which the DEP received a Response Action Outcome (RAO) Statement.

Therefore, IES concluded that based on the results of the IRA activities, including a UST closure program; soil removal;  soil and groundwater testing; a soil gas survey; and the closures of an on-site oil/water separator and associated floor drain system; and the findings of a Massachusetts Contingency Plan (MCP) Method 3 Risk Characterization in conjunction with the implementation of an Activity Use and Limitation (AUL), a condition of “No Significant Risk” was achieved at this Disposal Site. Therefore, a Class A-3 Response Action Outcome (RAO) Statement was appropriate for these releases and was submitted to the DEP.