Presented by: Craig Puerta, PE, MBA December 12, 2012

Transcription

1 Presented by: Craig Puerta, PE, MBA December 12, 2012

2 Established in 2010 under charter from New York State to transfer lower priority sites from State s program. First municipally-run brownfield cleanup program in the nation City Office also handles all Zoning E Designations that cover environmental issues such as oil tanks, noise, and fuel oil selection. City has standardized templates to assist certified consultants with application of all necessary reports. City has recently instituted Green Property Certification

3 Green Property Certification: A Green Property Certification signifies that the property has been the subject of a comprehensive Remedial Investigation under government supervision and if necessary has received remedial actions sufficient to satisfy regulatory cleanup standards A record of this certification will be maintained by OER and may be used by enrollees and their successors to communicate the highly protective status of the property to prospective purchasers, lessees, and occupants

4 New York State authorized City to perform cleanup on lightly contaminated properties in Five Boroughs. This primarily is for historic urban fill sites (very common throughout NYC) Owners of sites enrolled in the City BCP can be eligible for various grants throughout the entire site development process. Upon completion, City will issue release of liability and covenants not to sue.

5 For services that precede cleanup activities, a Qualifying Brownfield Property is one with the presence or likely presence of any hazardous substance. For cleanup activities or environmental insurance, a Qualifying Brownfield Property is one that is enrolled in the NYC Brownfield Cleanup Program (NYC BCP). For a Hazardous Materials E-Designation or Restrictive Declaration Remediation Grant, a Qualifying Brownfield Property is an E-Designation or Restrictive Declaration Hazardous Material site. For a Technical Assistance Grant, a Qualifying Brownfield Property is one with the presence or likely presence of any hazardous substance where the developer is a not-for-profit corporation of a Preferred Community Development Project.

6 Most projects are eligible for up to $60,000 in grant funding, with an add on $25,000 bonus grant for any site that is remediated to Track 1 (permanent) clean up standards. Preferred Community Development Projects are eligible for up to $100,000 in grant funding, and are also eligible for the Track 1 bonus cleanup grant. In addition, a Preferred Community Development Project site designated by the NYS Department of State as a BOA Strategic Property is eligible for an additional add on bonus grant of $10,000. BIG Program requires that all services and activities eligible for reimbursement be performed by a qualified professional who is registered with the BIG Program as a Qualified Vendor. Applying to become a BIG Program Qualified Vendor is a simple, non competitive process and applications are accepted on a rolling basis

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9 The SPEED (Searchable Property Environmental E- Database) Web application enables users to search properties in New York City and view environmental information. SPEED is a Geographic Information System (GIS)-based portal designed to encourage developers, community organizations, consultants, and the public to explore potential redevelopment opportunities in neighborhoods throughout the City. SPEED displays historic maps and aerial photos, provides comprehensive City, State, and Federal government environmental databases, allows users to make notes about properties of interest, and prints maps and reports.

10 The SPEED (Searchable Property Environmental E- Database) Web application enables users to search properties in New York City and view environmental information. SPEED is a Geographic Information System (GIS)-based portal designed to encourage developers, community organizations, consultants, and the public to explore potential redevelopment opportunities in neighborhoods throughout the City. SPEED displays historic maps and aerial photos, provides comprehensive City, State, and Federal government environmental databases, allows users to make notes about properties of interest, and prints maps and reports.

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14 Subsurface Sources of VOCs: Groundwater (impacted) Non-aqueous phase liquids Buried wastes Underground storage tanks and/or drums Surface Sources of VOCs: Dry cleaners, gas stations, industrial sites, dumping, Superfund Sites, new construction building materials. Human Exposure: Direct inhalation

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16 New York State Department of Health Guidance for Evaluating Soil Vapor Not Transactional Driven ASTM Vapor Encroachment Screening Transaction Driven ITRC Vapor Intrusion Guidance Considered a pragmatic evaluation of soil vapor for multiple applications.

17 Adopted in Late 2006 Not enforceable, however, used by DOH as a basis for evaluating potential concerns for VI. Intended to be used in conjunction with subslab AND indoor air samples. Many instances absence of indoor air makes this guidance inappropriate for use.

18 Soil Vapor vs. Sub-Slab Samples Soil Vapor- not beneath a slab or foundation Used to evaluate if contamination is present in media, nature/extent of presence of vapor. Sub-Slab directly beneath a foundation or slab. Used to evaluate potential direct human exposure. and Possible future exposure scenarios Comparison of site specific conditions and/or rate on attenuation into indoor air of building. Generally must be accompanied by concurrent indoor air sample. Intended to be used in conjunction with sub-slab AND indoor air samples. Many instances absence of indoor air makes this guidance in- appropriate for use.

19 Impact of heating season on sample results. Doors and windows are closed, influences likelihood of presence of VOCs in indoor air. Ambient outdoor air sample often warranted to determine background conditions.

20 Consider a nationally recognized baseline for transactional driven assessments. Vapor Encroachment Screen and Condition are evaluated by the Environmental Professional Evaluation of conditions on or near your target property. A standard Phase I ESA prior to new 2013 revision did not include VEC screens unless requested by user. New 2013 ASTM will stipulate that VEC must be considered.

21 Vapor Encroachment Condition (VEC) is defined as the presence or likely presence of any volatile chemical of concern in existing or planned structures on a property resulting from an existing release or a past release from contaminated soil or groundwater on the property or within close proximity to the property, at a concentration that presents or may present a human health risk.

22 Phase I environmental Site assessment or Phase II investigation commonly yield environmental conditions as finding, which subsequently lead to a Tier 1 E study. Many banks/lenders minimize their risk by requiring further investigation.

23 Tier 1 Screen Screen information from a Phase I ESA Liability remains with EP to review all pertinent information. Each site will present specific conditions which the EP must weigh as evidence to support ruling out if a vapor encroachment condition exists. Risk management factors include current usage of property, condition, future use?, quality of environmental records, data gaps from Phase I?, Reasonably ascertainable falls back to whether Phase I standard was executed to industry standards.

24 Tier 1 Screen- Evaluation If Groundwater flow direction, up-gradient vs. down-gradient RECs Known subsurface geology

25 Tier 2 Screen- As a result of Tier 1, if a VEC cannot be ruled out from the desktop review of information for the presence of the VEC, an invasive or noninvasive Tier 2 must be implemented. Utilizes a numeric analysis of historic data set. Invasive sampling typically includes soil, soil gas, groundwater Can be limited to target property or off-site if necessary.

26 Tier 2 Screen- Critical distance determination 30 ft for a dissolved petroleum plume. 100 feet determination if LNAPL is present. Subject to EP s review and determination if this distance is appropriate. EP can modify distance based on available data.

27 Indoor Air Sampling Groundwater Sampling Predictive Modeling Soil Gas Sampling

28 Flow Regulator Summa Canister

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32 How do you fix soil vapor intrusion? New Construction vs. Existing Buildings New Construction Vapor Barriers Sub-Slab Depressurization Aerated Flooring Existing Buildings Soil Vapor Extraction Sub-Slab Depressurization retro-fit through suction pits. Aerated Flooring Source Removal Soil Disposal to remove impacted zone Long term in-situ treatment of groundwater to breakdown VOCs..

33 Vapor Barrier HDPE Membrane often up to 60 mils (1 sheet of paper is 4 mils). Used beneath future foundation to create a bathtub seal around foundation preventing vapors from migrating into building. Engineered system includes complete detailing with mastics and tapes to eliminate preferred pathway. Products carry a 20-year warranty and many manufacturers will warranty their products against VOC degradation.

34 Sub-Slab Depressurization Works on the concept of creating a pressure differential between the sub-surface and the basement/first floor of the building Slotted pipe in a gravel trench collects the accumulated vapor and vents to the atmosphere. Passive system works on atmospheric pressure gradients Active systems are connected to low horsepower suction fans which create active gradient

35 Aerated Flooring Void space provides dilution and removal of contaminates Can be a fully passive system no electricity costs Eliminate the need for expensive mechanical piping, gravel beds and barrier mitigation systems on contaminated sites Reduced slab curling Addresses Radon, Methane, moisture, and other VOCs Offers future protection for minimal cost vs. conventional slab Other benefits: reduced concrete, significantly reduced backfill, LEED points, very fast installation

36 Soil Vapor Extraction Similar concept to sub slab depressurization. Creates a higher flow rate by using much larger vacuums and extraction. Often system is manifolded in subsurface to create vacuum/extraction from multiple subsurface zones. Additional treatment of air is often required, carbon filtration, cyclone, air stripper stack. Permits through appropriate state agencies required.

37 Sub-Slab Depressurization

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39 Sub-Slab Depressurization

40 Sub-Slab Depressurization

41 Vapor Barrier

42 Aerated Flooring