New York City School Construction Authority Phase I/Phase II Environmental Site Assessment Services
Posted on June 12, 2015
Client: New York City School Construction Authority
Location: New York City, New York
Project Type: Phase I/Phase II Environmental Site Assessment Services
- Phase I Environmental Site Assessments
- Site Inspection and Regulatory Agency Database Reviews
- Phase II Environmental Site Assessments
- Indoor Air Quality Surveys
- Outdoor Air Assessments
- Preparation of Design Documents for Remedial Construction
- Engineering Services during Construction of Engineering Controls
- Performance Monitoring of Installed Engineering Controls
- Tank Closures
D&B Engineers and Architects, P.C. was awarded a 3-year-term contract with a 1-year extension by the New York City School Construction Authority (NYCSCA), Industrial Hygiene Division to provide hazardous waste materials investigation and engineering design services to over 50 properties located within the five boroughs on an on-call basis.
The NYCSCA Real Estate Department has proposed various sites within the five boroughs for property acquisition and construction of a new school facility, lease renewal of an existing lease, construction of an addition to an existing school facility or renovation of an existing school facility. The work performed under this contract was performed in order to assess the suitability of the properties for use as public school facilities and if not deemed suitable identified potential mitigation options (engineering controls) to render it suitable.
In addition to the various types of environmental assessments and engineering services described above, D&B also provided the following services:
- Sub-slab depressurization systems (SSDS)
- Soil vapor barriers
- Soil remediation (earthwork)
- Review of contractors shop drawing submissions
- Inspection of remedial activities for conformance with contract requirements
- Community air monitoring
Phase I Environmental Site Assessments
Under this contract, D&B conducted approximately 20 Phase I ESAs. Phase I ESAs were conducted for all properties that were identified as a potential location for a public school facility. The Phase I ESAs were conducted in accordance with ASTM E 1527-05 requirements and included a site inspection of the subject property and surrounding area, a review of current and historical databases and interviews with current occupants. The goal of the Phase I ESA was to identify any Recognized Environmental Conditions (RECs) and environmental concerns associated with the Site. If RECs were identified a Phase II Scope of Work was prepared in order to investigate the RECs and the possible impacts to the Site.
Site Inspection and Regulatory Agency Database Reviews
Site Inspection and Regulatory Agency Database Reviews were conducted for all properties leased by the NYCSCA, in lieu of a Phase I ESA. Under this contract D&B conducted 5 Site Inspection and Regulatory Agency Database Reviews. The Site Inspection and Regulatory Agency Database Review consisted of a site inspection of the subject property and surrounding area, review of current databases as well as any existing reports of prior assessments of the subject leased property. Site Inspections and Regulatory Agency Database Reviews differ from Phase I ESAs in that historical databases are not reviewed as they have already been addressed, therefore regulatory database reviews focus on recent and current conditions for the property.
Phase II Environmental Site Assessments
D&B has conducted over ten Phase II Environmental Site Investigations (ESIs) to evaluate RECs which had been identified for the sites. Phase II ESIs which have been conducted for the NYCSCA have typically involved geophysical surveys, advancement of soil borings/probes, installation of monitoring wells and sampling of environmental media including soil, groundwater, sub-slab soil vapor, ambient air and/or radon. In addition to evaluating the RECs identified in the Phase I ESA the Phase II ESI have also included collection of samples for pre-design services related to new construction. Typically soil and ground water samples have been collected when excavation and dewatering activities are anticipated in order to determine the appropriate handling and disposal requirements and obtain a sewer discharge permit.
Indoor Air Quality Surveys
When RECs identified for a property relate to potential vapor intrusion and/or air emissions which may adversely impact the suitability of the site for use as a public school facility an Indoor Air Quality (IAQ) Survey is performed. D&B has conducted over ten IAQ Surveys for the NYCSCA. IAQ Investigations have consisted of the collection and analysis of indoor air samples as well as an outdoor air sample (serves as background) for volatile organic compounds (VOCs) and the completion of a New York State Department of Health (NYSDOH) Indoor Air Quality Questionnaire and Building Inventory. Sample collection is performed in accordance with the New York State Department of Health (NYSDOH) Final Guidance for Evaluating Soil Vapor Intrusion in the State of New York dated October 2006.
Outdoor Air Assessments
Under this contract, D&B has conducted three Outdoor Air Assessments for NYCSCA properties in accordance with the American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE) Standard 62.1-2004 (Standard) Section 4.0: Outdoor Air Quality. Outdoor Air Assessments are required to satisfy the New York City Department of Education/NYCSCA green Schools Guide Credit Q1.1 R: Minimum IAQ Performance/Increased Ventilation and consisted of a qualitative evaluation of regional and local air quality. The evaluations consisted of regional Air Quality Compliance Status and a local survey.
Preparation of Design Documents for Remedial Construction
As part of this contract, if the findings of the Phase II ESA indicated that Engineering Controls were required to render the property suitable for use as a public school then design documents were prepared. D&B has prepared technical specifications, design drawings and/or details for SSDSs, soil vapor barriers and soil remediation for over 10 properties. The specifications that D&B has prepared for the NYCSCA includes but is not limited to:
- Section 02000: Selective Demolition and Site Work
- Section 02010: Environmental Site Assessment Reports
- Section 02091: Excavation, Storage, Handling, Transportation
and Disposal of Petroleum-Contaminated Material and/or
- Section 02200: Earthwork
- Section 02220: Gas Vapor Barrier (Fluid Applied)
- Section 02221: Sub-Slab Depressurization Systems (SSDS)
- Section 09670: GEI Gas Vapor Barrier Flooring and Wall System
Engineering Services during Construction of Engineering Controls
Under this contract, D&B has also provided Engineering Services during the construction of Engineering Controls. The services provided have included review of shop drawing submissions, response to a request for information (RFI) as they pertain to technical specifications prepared for the subject property and inspections of remedial activities.
Under this contract, D&B has prepared Community Air Monitoring Plans (CAMPs) in accordance with the New York State Department of Environmental Conservation (NYSDEC) Division of Environmental Remediation Draft DER-10 Technical Guidance for Site Investigation and Remediation (August 2002) requirements. CAMPs were implemented during excavation and backfill activities during soil remediation projects for three schools. CAMP activities included continuous monitoring for dust particulates during all intrusive excavation activities. Four CAMP stations, each consisting of a DusTRAK™ aerosol monitor set on a tripod with visible strobe/alarm to alert D&B personnel of any alarm conditions, were installed surrounding the area of ground intrusive activities to accurately capture both upwind and downwind conditions and concentrations were measured continuously throughout the day. Particulate monitoring at each station was conducted with a portable real-time particulate monitor capable of measuring particulate matter less than 10 micrometers in size, and capable of calculating 15 minute running average concentrations. Whenever the visible alarm was observed control measures were in-stated to alleviate the alarm condition.
Performance Monitoring of Installed Engineering Controls
D&B has also provided NYCSCA with performance monitoring of Installed Engineering Controls. In particular D&B conducted performance monitoring for an SSDS system that was installed in a public school located in Queens, NY. When the system was initially installed D&B provided weekly monitoring of the system which included: inspection of moisture traps; checking compressor; pressure readings across the system; and inspection of the fan. After each inspection a field activity report was prepared and submitted to document system conditions. If deficiencies were observed corrective actions were implemented. After approximately 1 year, the frequency of the performance monitoring was stepped down to twice a month, then monthly. For this project D&B also prepared an Operation and Maintenance (O&M) Plan for the system and provided training to the school staff.
Under this contract, D&B also assisted the NYCSCA in the closure of both aboveground storage tanks (ASTs) and underground storage tanks (USTs). As part of these assignments D&B conducted an initial tank inspection, undertook a field sampling program (if required), prepared tank removal specifications (Section 02115 Petroleum Bulk Storage Tank Removal) and a tank closure report for submittal to the NYSDEC.
Under this contract D&B undertook remediation and monitoring activities at two NYCSCA properties with reported spills under the NYSDEC Spills Program. Both projects involved petroleum impacted soils and groundwater in which bio-remediation technology was utilized to address on-site contamination. D&B monitored groundwater quality on each property by performing quarterly groundwater sampling and preparing quarterly monitoring reports. In addition D&B provided oversight for the injection of the bioremediation product (ReGenOx) at the Site as well as subsequent evaluation of the technology. For one project D&B was also responsible for product recovery efforts, which included both manual and mechanical removal of non-aqueous phase liquids from both monitoring and product recovery wells.
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