HomeMy WebLinkAboutSoil Managment Plan - SMWP Southside East
May 10, 2012
Mr. Brad Atkinson, Brownfields Project Manager
N.C. Brownfields Program Division of Waste Management
N.C. Department of Environment and Natural Resources
401 Oberlin Rd, Suite 150
Raleigh, NC 27605-1350
Subject: SOILS MANAGEMENT WORK PLAN SOUTHSIDE EAST
REDEVELOPMENT (FORMER ROLLING HILLS SITE)
DURHAM, NORTH CAROLINA
BROWNFIELDS PROJECT #: TBD
URS – NORTH CAROLINA PROJECT NO. 38854599
Dear Mr. Atkinson:
URS Corporation – North Carolina is providing this Soils Management Work Plan for your
review. This document has also been provided to site redevelopment design/build team members
for implementation. If you have any questions, please contact me at 704-522-0330.
Sincerely,
URS Corporation – North Carolina
Michael Fulkerson, Environmental Scientist
CC: Richard Valzonis, City of Durham
Pat Wylie, North Carolina Department Of Health and Human Services
Jeff Dellinger, North Carolina Department Of Health and Human Services
Robert Herrick, P.E., CIH (N.C. Asbestos Designer)
Randy Rhoads, McCormack Baron Salazar
Karl Schlachter, McCormack Baron Salazar
Richard Lesser / Leonard Slosky, Slosky & Company, Inc.
Enclosure: Soils Management Work Plan
Page 1
SOILS MANAGEMENT WORK PLAN
SOUTHSIDE EAST REDEVELOPMENT PROJECT
(FORMER ROLLING HILLS SITE)
BROWNFIELDS PROJECT #: TBD
URS – NORTH CAROLINA PROJECT NO. 38854599
May 10, 2012
Background Summary
The Southside East Redevelopment property (Site or Subject Property) was historically used for
residential purposes dating back to at least 1913. Until recently the Site consisted of eighty-six
separate former residential parcels sited on approximately twenty acres of land in the former
Rolling Hills Subdivision in Durham, Durham County, North Carolina. The City of Durham is
currently working to redevelop the property with high-quality, mixed-income and market-rate
housing. With these objectives, the Rolling Hills subdivision was acquired in total by the City of
Durham in 2011.
According to public records review on the Durham County Geographic Information System, the
City of Durham is listed as the current owner of the property. The Site is described more fully
as:
“Approximate 20-acre parcel south of the Intersection of South Roxboro Street and
East Lakewood Avenue. Bordered on the west by S. Roxboro Street, the south by
Piedmont Street, and the north by East Lakewood Avenue. On the east, the site is
bordered by a shopping center.”
McCormack Baron Salazar (MBS) contracted AECOM Technical Services, Inc. to conduct a
Phase I Environmental Site Assessment (ESA) and subsequent Phase II ESA. The result of the
Phase II indicated soil and groundwater contamination onsite above NC DENR Residential and
Soil-to-Groundwater Maximum Soil Contaminant Concentrations (MSCCs) for lead and
polycyclic aromatic hydrocarbons (PAHs). Almost all of this soil contamination above North
Page 2
Carolina standards is restricted to soils interstitial to buried building debris - apparently used to
backfill a former ravine on the northeast portion of the property. Two smaller areas (~ 150 cubic
yards each) of contaminated soils are also present onsite, and are not associated with a significant
amount of building debris.
Within the former ravine, North Carolina DENR has agreed that the soils interstitial to building
rubble are not impacted by total petroleum hydrocarbons; the PAH’s likely originated from
burning of the rubble prior to final grading on the site. The building debris itself contains
asbestos containing materials (ACM), although no regulated levels of asbestos were observed in
the interstitial soils. Nevertheless, soils interstitial to debris from the inner core of the ravine will
be considered ACM contaminated and disposed of as asbestos containing waste.
The two additional contaminated areas that have been observed, both without a significant
proportion of debris, are:
~ 150 cubic yards of soils adjacent to the former ravine is contaminated with PAHs, and
~ 150 cubic yards of soils in the center of the site is impacted by Total Petroleum
Hydrocarbons (TPH). However, constituents of petroleum (such as benzene or PAHs) in
this area were not observed to exceed relevant action levels.
Groundwater impacts were observed at two locations: Benzene at 1.3 μg/L at the property
perimeter which is believed to be derived from an offsite source to the southeast and
Naphthalene at 9.8 μg/L in an area more central to the site. The naphthalene-impacted
groundwater is co-located with the area of soils impacted by petroleum hydrocarbons, even
though naphthalene above North Carolina standards was not observed in this area’s soils.
MBS, acting as agent for the City of Durham, plans to redevelop the site with new residential
housing. This Soil Management Plan (SMWP) describes the remediation approach for the onsite
impacted soils and associated construction debris.
The following table provides a reference name, general location on site, and estimated quantity
of areas of soils impacted above relevant North Carolina residential standards.
Table I
Area Name Location Estimated
Area
Estimated
Impacted Soil /
Debris Volume
To Be Managed
Known
Constituent
Impacts
Former ravine Northeast corner 1.9 acres 9,606 yds3 total
1,170 tons of soil
/ debris with
ACM
PAHs, ACM,
Lead
Page 3
SS-10/TW-1 Central/West Negligible 150 yds3 TPH
TP-22 NE corner,
immediately
adjacent west to
former ravine
Negligible 150 yds3 PAHs
Figure 1 (attached) depicts the areas of contamination referenced in Table I above. Figure 2
(attached) shows areas that will be underlain with geotechnically suitable fill prepared using
debris and associated contaminated soil that is free of regulated levels of asbestos. Figure 2 also
shows where contaminated debris will remain at-depth in the former ravine; these deep materials
are outside of the construction envelope and will remain at great depth onsite. Therefore, they
need not be pre-emptively managed to render the site safe for residential land use.
MBS proposes to address the contaminated soil and debris that will be displaced during
construction, with oversight by the North Carolina Brownfields Program. This SMWP identifies
the engineering and administrative controls appropriate for management of the contaminated
soils and debris. Because the potential also exists for additional areas of soil contamination not
already identified in the extensive Phase II assessment conducted onsite, appropriate engineering
and administrative controls are also specified in this SMWP for these areas. Because
construction is not expected to intersect the groundwater table, these areas of contamination are
not addressed in this SMWP. Surface water runoff, which is expected to accumulate during
excavation of the former ravine, will be subject to appropriate engineering controls, as described
below.
MBS intends to remove and ship for offsite disposal ACM and soils contaminated by petroleum
hydrocarbons. Debris and interstitial contaminated soils will be used to construct geotechnically
suitable fill.
All soils remaining onsite that exceed North Carolina residential action levels will be covered
with a brightly-colored, permeable witness barrier and at least two feet of a clean soil cap.
Importantly, much of this clean soil cap will extend beneath the site’s future hardscape
improvements. Because of structural support requirements beneath hardscape, the thickness of
clean soil cap that overly contaminated materials will typically exceed five to seven feet.
Importantly, all utility trenches will be placed in clean fill, so that future utility maintenance need
not be concerned with management of contaminated materials.
This SMWP may need to be amended as the design/build process continues at the site.
Page 4
Soil Management Work Plan Requirements
General
Contaminated soils and ACMs that are displaced during construction activities will be subject to
the provisions of the SMWP.
The contractor is responsible for visually inspecting all construction rubble excavated from the
former ravine and removing items classifiable as solid waste by North Carolina regulation.
These items include, but are not limited to, lumber, tree stumps, rebar free of enclosing concrete,
and miscellaneous wood. In addition to this visual inspection for solid waste, oversight will be
performed to detect universal wastes and PCB bulk product wastes such as, but not limited to,
electrical ballasts, thermostats, and fluorescent lights. Importantly, universal wastes or bulk
product wastes were not observed in any of the exploratory trenches previously advanced onsite.
Universal wastes and bulk product wastes will be removed and stored onsite for subsequent
management offsite at a properly permitted RCRA Subtitle C or TSCA permitted facility.
Lastly, inspection for ACM will be performed by a North Carolina- accredited asbestos
inspector, designer, or air monitor; ACMs identified in this inspection will be shipped off-site for
disposal at a properly permitted facility.
The former ravine has been observed to contain mixed soil/debris with a percentage of debris up
to 40% to 55 % in the middle of the former ravine, with less debris present on the flanks of the
former ravine. These materials are located in areas shown in Figure 1. Additional areas of
possible contamination may be encountered based on substantial visual or olfactory evidence of
contamination. The identification of soils containing greater than 10% debris, or with substantial
visual or olfactory evidence of contamination in areas other than those previously documented
will trigger, within 24 hours, inspection by a North Carolina-accredited asbestos inspector,
designer, or air monitor. Subsequent notification to the DENR contact listed in the Brownfields
Agreement will be provided if ACMs are observed in these areas. All newly- discovered areas
of contamination will be subject to the identical engineering and administrative controls that
apply to the former ravine area.
Definitions and Description of Materials
Overall, soils and debris excavated during construction activities can be grouped into five major
categories:
1. Former Ravine Soils and Debris with Asbestos
Defined as soils and ACM debris excavated from the 1.9 acres constituting the former ravine.
These soils may also be contaminated with PAHs and lead. ACM debris will be disposed of
through a direct load process into lined containers (either trailer, dumpster, or alternate
Department of Transportation-approved containers for over-the-road transport) for disposal at an
approved facility.
All soil and construction debris removal from the former ravine area will be performed under the
oversight of a North Carolina-accredited asbestos inspector, designer, or air monitor. Debris
Page 5
with levels of ACM precluding discrete removal and segregation will be excavated and directly
placed in containers for subsequent disposal off-site. Soils and construction debris from portions
of the former ravine area that contain de minimis amounts of ACMs will be picked free of
ACMs. At the discretion of the accredited asbestos inspector, designer, or air monitor, if the
amount of ACM exceeds a de minimis threshold, then the entire bulk of debris and soil will be
shipped offsite as ACM.
Soils and construction debris from portions of the former ravine area that do not contain ACMs
will be transferred to the areas designated on Figure 2 and processed for use as geotechnically
suitable fill.
Trucks receiving soils and construction debris from the former ravine area will be driven only
over known clean soils, and their exteriors sheathed in Visqueen plastic sheeting to prevent
contamination and eliminate the need for water-based truck decontamination. Trucks or
construction vehicles (such as sheeps foot rollers that prepare engineered fill in retention areas)
that contact contaminated soil and construction debris will be decontaminated using a high-
pressure water wash prior to exiting these contaminated zones.
ACM laden debris and interstitial soil will be transferred to a landfill permitted to accept the
material.
2. Former Ravine Soils and Debris Without Asbestos
Defined as soils excavated from the ACM-free balance of the 1.9 acres constituting the former
ravine, which may be contaminated with polyaromatic hydrocarbons and lead. These materials
will be visually inspected by a North Carolina-accredited asbestos inspector, designer, or air
monitor and confirmed to be free of regulated ACMs. Contaminated soils and debris removed
from the main area will be processed for use onsite as geotechnically suitable fill.
Trucks receiving soils and construction debris from known contaminated areas of the former
ravine area will be driven only over known clean soils, and their exteriors sheathed in Visqueen
plastic sheeting to prevent contamination and eliminate the need for water-based truck
decontamination. Trucks or construction vehicles that contact contaminated soil and
construction debris for use as geotechnically suitable fill will be decontaminated using a high-
pressure water wash prior to exiting these contaminated zones.
All areas of the former ravine as marked on Figure 1 will be covered with a witness barrier (a
brightly colored, permeable plastic of good tensile strength) after excavation. Confirmation of
removal sampling will not be performed in this area.
3. PAH Impacted Soils (TP-22)
Defined as approximately 150 cubic yards of soils contaminated by PAHs. Debris does not
constitute more than 10% of the materials in this area. Soils and debris removed from this area
will be disposed of through a direct load process into lined containers (either trailer or dumpster)
for disposal (or use as daily cover) at a properly permitted facility.
Page 6
After all visually and olfactory impacted PAH impacted soils are removed from this area,
confirmation sampling for PAHs will be performed.
4. Petroleum Impacted Soils (SS-10)
Defined as approximately 150 cubic yards of soils contaminated by petroleum hydrocarbons.
Debris does not constitute more than 10% of the materials in this area. Soils and debris removed
from this area will be disposed of through a direct load process into lined containers (either
trailer or dumpster) for disposal (or use as daily cover) at a properly permitted facility.
After all visually and olfactory impacted petroleum impacted soils are removed from this area,
confirmation sampling for TPH, VOCs, and PAHs will be performed. If contaminant
exceedances of North Carolina residential standards are observed, additional excavation will be
performed followed by testing until remaining materials are demonstrably safe for residential
land uses.
5. Non-Impacted Soils (Remaining Soil Onsite)
Defined as soils deemed to be uncontaminated based on previous site geotechnical and
environmental work, field screening, visual, and olfactory review and not located within the
former ravine, or areas near SS-10 and TP-22. Soils deemed “non-impacted” will be used onsite
in accordance with the site plan specifications, or shipped offsite for re-use as clean fill or as
daily cover at an accepting landfill. Surplus “non-impacted” soil may be stockpiled on the
southern portion of the site for future re-use as clean fill or as daily cover at an accepting landfill.
Page 7
Execution - Engineering and Administrative Controls
Former Ravine Area
When construction activities involve the excavation of contaminated materials in the former
ravine area, an Environmental Representative (i.e. environmental personnel independent of the
general or excavation contractor trained in the identification, field screening, and sampling of
contaminated materials) will observe and document the condition of these soils as they are
excavated, including identification of potential contamination and identification of saturated and
unsaturated soils. The Environmental Representative shall also be a North Carolina-accredited
Asbestos Inspector, Asbestos Designer, or Air Monitor. A primary responsibility will be to
observe the area and make determination and record of the presence or absence of ACM as the
excavation proceeds.
A North Carolina-accredited Air Monitor will generate two series of air tests during work in the
former ravine area: 1) at the exclusion zone perimeter, and 2) at the property perimeter. The
North Carolina-accredited Air Monitor will collect excavator / operator personal initial air
samples for both lead and asbestos exposure. Ambient air samples will also be collected upwind
and downwind of the excavation/work area, and also at the site perimeter, for analysis of
asbestos and lead. The personal air sample and excavation/work area results will be compared to
the OSHA PELs for lead, and if an OSHA Negative Exposure Assessment is confirmed,
sampling for lead will be terminated. Personal air monitors, exclusion zone monitoring, and
property perimeter monitoring for asbestos will continue throughout excavation in the former
ravine area. Should downwind measurements show concentration excursions, the Environmental
Representative will review the situation to determine if changes in operating procedures,
increased working distances or enhanced dust control methods are needed to suppress dust
release.
The Environmental Representative shall provide oversight for the removal of materials that
present a puncture or tear hazard to the lining of the trailer/dumpster. Materials such as metal
rebar, glass, and/or ceramic tile may need to be separated from the remaining soil and debris so
as to prevent accidental discharge to the atmosphere while the material is in transit.
Alternatively, this material can be direct-loaded into the center of the truck, so that contact with
the enveloping Visqueen is prevented.
If a quantity of ACM is observed in the excavation bucket that precludes further segregation, the
debris/soil mix will be direct-loaded into a lined truck or roll-off box for disposal as ACM waste.
If none is observed in the bucket the material coming from the excavation will be deposited in 6”
lifts for closer inspection. If a minor amount of non-friable ACM is observed it can be removed
and bagged by either the accredited inspector, designer, or air monitor for separate disposal as
ACM. Absent the presence of ACM the project will re-use the remaining soil and debris in the
manner consistent with the Environmental Specifications.
Should a conflict arise between the Environmental Representative and the contractor regarding
ACMs, the judgment of the Environmental Representative will supersede. If a “stop work” order
is given by Environmental Representative, they must at that time contact MBS for a final
Page 8
determination.
When the North Carolina-accredited asbestos inspector, designer, or air monitor determines that
the presence of ACM in the excavated material from the former ravine has apparently been
completed the excavation procedures will change. Subsequently, there will be daily observations
by a North Carolina accredited Asbestos Inspector, Project Designer or Air Monitor to document
the presence or absence of ACM debris as long as site grading activities are on-going. Should
the Asbestos Inspector, Project Designer or Air Monitor encounter deviations from SMWP the
North Carolina-accredited individual will contact the Environmental Representative and inform
him/her of the deficiency. If the North Carolina-accredited individual encounters significant
deviations, the North Carolina-accredited individual shall issue a stop-work order until the
deficiency is corrected. An additional responsibility of the North Carolina-accredited individual
will be to routinely observe excavations throughout the site to confirm the presence or absence of
ACM debris. The North Carolina-accredited individual will file daily reports in the project
record, describing the extent of their daily inspections and whether ACM or suspect ACM had
been identified. If ACMs are found in more than de minimis levels, the Asbestos Project
Designer will review the situation for appropriate resolution.
Isolated Areas (SS-12 & TP-22)
Contaminated soils and debris in the two isolated areas in the vicinity of SS-12 and TP-22 will
be excavated and transported offsite for disposal or use as daily cover. It is expected that the
soils from these two areas will be directly loaded into trailers/dumpsters and removed from the
site in a timely manner.
If complete excavation cannot be accomplished in one day, any stockpiled contaminated soil will
be covered with plastic sheeting to reduce the potential for releases due to ambient winds and/or
precipitation.
Confirmatory samples will be collected from the two locations of previously impacted soil (SS-
12 and TP-12). The Environmental Representative will collect four sidewall and one bottom soil
samples. Additional samples will be collected if the excavated volume exceeds 150 cubic yards,
at a proportionate frequency to the original design. Samples will be analyzed for constituents
previously detected above action levels at these locations.
Non-Impacted Soils (Remaining Soil Onsite)
The non-impacted soils make up the remaining soils at the site. The name “non-impacted” is not
an assurance that unknown impacts are not located in this area. However, based on the extensive
sampling that has occurred on site it is unlikely unknown soil impacts will be encountered. Soils
deemed “non-impacted” will be used onsite in accordance with the site plan specifications. In
the event a surplus of soil is located at the site, these soils may be sent offsite for use as clean fill
or as daily cover at an accepting Construction and Demolition Debris (C&D) landfill.
If during excavation in the non-impacted soil area, materials are discovered that resemble soil
and debris from the former ravine area, the contractor should temporarily cease work, and notify
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the Environmental Representative for further direction.
Additional Considerations
Contaminated Stockpiled Soils
In the event that contaminated soils need be stockpiled on site prior to final disposition,
stockpiles will be placed onto and covered with polyethylene (Visqueen) sheeting, which will be
secured using hay bales or similar methods to maintain integrity. The soils will be stockpiled in a
manner to prevent water and/or sediment from the impacted surrounding soils and from entering
the site’s storm water system or from flowing offsite. The stockpile and containment will be
constructed in a manner consistent with documentation found in the NCDENR Inactive
Hazardous Sites Branch (IHSB) Program Guidelines for Assessment and Cleanup guidance
documents. The site contractor will minimize the necessity of stockpiling soils on the site.
Dewatering Effluent Treatment & Discharge Plan Requirements
At this time construction activities are not planned that will intersect groundwater to the point of
requiring dewatering. If the water table is intersected and dewatering is required, a Dewatering
Effluent Treatment & Discharge Plan will be prepared which identifies the means, methods, and
procedures for temporary storage, removal of solids, and discharge/disposal of dewatering
effluent generated during the project.
Site Safety and Health – Special Considerations
Work at the site will comply with the Occupational Safety & Health Administration (OSHA)
rules for trenching and excavation as defined in 29 CFR 1926.651 and .652.
If work onsite encounters newly discovered conditions that could create a hazard addressed
under 29 CFR 1910.120, the contractor’s Health and Safety Plan requirements for such
conditions will be invoked and a copy provided to the Brownfields Program. General safety and
health procedures will be implemented to account for the handling of contaminated or potentially
contaminated materials and verify that conditions associated with the potentially contaminated
soils, surface water runoff, or groundwater do not pose a hazard to onsite workers.
Site workers in the vicinity of active excavation of contaminated materials will follow industry-
standard health and safety procedures, including but not limited to, half-face respirators, steel-toe
rubber boots, and disposable nitrile gloves, as warranted or as directed by the onsite
Environmental Representative, North Carolina-accredited Asbestos Inspector, Designer, Air
Monitor, or the site Health and Safety Officer.
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