HomeMy WebLinkAbout22062_Smokey Hollow 2_AWP_20190226L(iiAPTUSManagement, PLLC
February 26, 2019
Sharon Eckard
Project Manager, Brownfields Program
Division of Waste Management
North Carolina Department of Environmental Quality
1646 Mail Service Center
Raleigh, North Carolina 27699-1646
Subject: ENVIRONMENTAL SITE ASSESSMENT WORK PLAN
SMOKEY HOLLOW 2
NCBP PROJECT NO.22062-18-092
Dear Ms. Eckard:
Provided below is the Environmental Site Assessment Work Plan for Smokey Hollow 2 for your review.
As we discussed, our objectives are to provide further information on possible soil, soil vapor and
groundwater contamination to help guide the EMP process and for the revised Brownfields Agreement for
Smokey Hollow 2. Also, data will be collected to support the possible beneficial reuse of excess soil. As
we discussed, approximately 20,000 cubic yards of excess fill will be generated - provided it is not
contaminated, it may be suitable for offsite beneficial reuse.
INTRODUCTION
Smokey Hollow 2 is located between N. West St. and N. Harrington St. in Raleigh as shown on Figure 1.
A total of 2.17 acres of the site is currently subject to the Harrington St Brownfields Agreement (BFP No.
20031-16-092, Recorded January 7, 2017). A Brownfields Property Application was submitted on
November 27, 2018 by WK Smokey Hollow 2, LLC, the Prospective Developer, to add five small parcels
totaling 1.4 acres to the existing Brownfields Property. The Site is slated for high -density redevelopment
and all existing buildings and improvements have or will soon be demolished.
The entire 3.57-acre site consists of six parcels located in a commercial and residential area northwest of
downtown Raleigh, as shown in Figure 2:
Parcel ID
Address 11
Parcel No.
I Acreage
1*
413 N. Harrington St.
1 1704512292
2.17
2
506 N. West St.
1704511285
0.66
3
516 N. West St.
1704512404
0.51
4
520 N. West St.
1704511469
0.04
5
0 N. West St.
1704511562
0.05
6
524 N. West St. =L0704512525
1 0.14
*Includes former parcels at 437 and 431 N. Harrington St., subject to the existing Harrington St. BFA
Based on the prior Phase I and 11 ESAs and the information provided in the Harrington St. BFA, the
known concerns are offsite releases, which have resulted in onsite groundwater contamination at least in
the southern part of Parcel 1. Based on the assessment work to date, there are no known onsite releases on
any of the parcels, but there are some concerns based on past use.
Smokey Hollow 2 -Site Assessment Work Plan
Parcel 1 - 413 North Harrington St.
February 26, 2019
Page 2
This parcel is a recombination of 437 and 431 N. Harrington St. and subject to the existing Harrington St.
BFA. According to Mid -Atlantic Associates, Inc. January 13, 2015 Phase I ESA:
Groundwater contamination was noted on two adjacent properties, including a "closed" incident at the
former David Allen Company, Inc. property at 309 N. Harrington St. and an active leaking underground
storage tank (LUST) incident at the Wake County GSA complex to the southeast at 401 Capital Blvd.
Petroleum odors were noted on the southern adjacent, upgradient property during geotechnical drilling
of two borings approximately 15 feet south of the subject site, and during installation of a footer
approximately 90 feet south of the subject site. The borings and trench encountered the odor at depths
near the presumed location of the water table. Laboratory results confirmed groundwater contamination
at a monitoring well on the eastern adjacent property which is located cross-gradient/upgradient of the
subject site. The monitoring well is located approximately 130 feet southeast of the site.
According to Mid -Atlantic, February 11, 2015 Phase II ESA:
Mid -Atlantic installed two temporary groundwater monitoring wells, as shown on Figure 3, to test for
petroleum -related contamination from adjacent LUST sites. No contamination was noted at TMW-1,
located to assess releases at the Wake County GSA complex. Groundwater from TMW-2, installed
downgradient of the former David Allen Company, Inc. property, was contaminated with benzene at
4.9 ug/L (2L standard of 1 ug/L) and the C5 — C8 aliphatics were detected at a concentration of 2,400
ug/L, well above the NCGWQS of 400 ug/L. Mid -Atlantic did not observe evidence of petroleum -
contaminated soils above the water table at either boring location. The contaminant levels in
groundwater from TMW-2 were below the Residential and Non -Residential Vapor Intrusion Screening
Levels for groundwater.
Mid -Atlantic concluded that petroleum -impacts appeared to be localized near the southwest portion
of the subject site and limited to the groundwater.
According to an earlier Mid -Atlantic January 28, 2013 Phase I ESA, the following environmental concerns
were noted for 437 & 441 North Harrington St.:
Documented releases at nearby 401 Capital Boulevard, 509 North West St., 309 North Harrington
St., 601 North West St., 405 North West St., 300 West Johnson St., 510 Glenwood Avenue and
413 West Peace St.;
The historical operation of an automotive sales/service facility on the eastern adjacent property;
and
• The historical operation of a printing facility on the southern adjacent property.
Parcels 2-6
The Phase I ESAs conducted for Parcels 2-6 concluded there was the potential for groundwater impacts
and possible vapor intrusion risks due to offsite releases to the south and west, including a closed LUST
incident at the former Norwood Oil property at 509 and 601 N. West St., which abuts the redevelopment
site to the west. The Norwood Oil incident has a No Further Action finding and Notice of Residual
Petroleum, which makes it a Controlled Recognized Environmental Condition.
Smokey Hollow 2 -Site Assessment Work Plan
SCOPE OF WORK
February 26, 2019
Page 3
Our proposed scope of services includes a combination of three groundwater wells, five sub -slab (sub -
pavement) soil gas sampling points and ten soil samples. The soil sampling, besides being used to
identify possible impacts, would provide data to determine if beneficial reuse of excess soil that will be
generated during development will be a viable option for us.
Soil and Groundwater Sampling
• Advance and collect soil samples from 10 to 13 borings at the locations shown on Figure 4 and
Figure 4a using Direct Push Technology (DPT or GeoProbe). These sample locations are based on
our review of the site's usage history and are intended to provide a suitable overall understanding of
the site conditions to direct project planning.
• Wells would be installed in locations 1, 3 and 5 shown on Figure 4. Soil samples would be collected
from the 10 locations shown on Figure 4a. If possible, a boring would be used for both soil sampling
and as a well location.
The exact locations and depths of the borings will be determined in the field. Extracted soil will be
visually inspected for staining and screened with a photoionization device (PID) for evidence of
emissions of volatile organic compounds. If either staining or elevated PID readings are encountered,
a sample will be collected from the depth interval of the boring exhibiting those characteristics for
analysis of volatile organic compounds (VOCs) by Method 8260, semi -volatile organic compounds
(SVOCs) by Method 8270, and the eight RCRA metals and hexavalent chrome by Method 7199. For
the three borings where we will install wells, if there are no indications of adversely impacted soil, we
will not sample soil.
For the 10 soil samples that will be used to characterize the fill to allow us to consider beneficial reuse,
soil samplings will be collected within the anticipated cut depth (see Figure 4a) which varies across
the site. Multiple samples will be collected from a given boring if different soil strata are encountered.
Discrete samples will be collected for VOCs and three-point composite samples will be collected for
SVOCs and the metals. The ten samples will be analyzed for VOCs by Method 8260, SVOCs by
Method 8270, and the eight RCRA metals and hexavalent chrome by Method 7199.
Advance the borings into groundwater in three locations for temporary monitoring wells and collect
groundwater samples. After measuring depth to groundwater using a field -decontaminated water level
probe, a peristaltic pump and new tubing will be used at each well to collect low -flow samples (to
reduce turbidity) into laboratory -provided containers. Groundwater samples will be analyzed for VOCs
by Method 8260 and SVOCs by Method 8270 and the eight RCRA metals. The samples will be
transported under chain -of -custody protocols and shipped overnight to Prism Laboratories.
• Collect one duplicate soil (non -background) and one duplicate groundwater sample for Quality
Assurance/Quality Control (QA/QC) purposes for the same analyses described above.
• Prepare a report in accordance with the Report section of this Work Plan summarizing our field
activities and analytical results.
Soil Sampling Details
Soil borings will be advanced and continuously sampled using direct -push technology (DPT) sampling
methodologies with a GeoProbe operated by a North Carolina licensed driller. The ten soil borings for the
beneficial use characterization will be advanced to a depth coinciding with the cut depth in the area.
Smokey Hollow 2 -Site Assessment Work Plan February 26, 2019
Page 4
For borings where a well be installed, it will initially be advanced until saturated soil is encountered,
indicating groundwater had been encountered. This sampling approach will allow us to inspect the soil for
evidence of staining and/or olfactory evidence of petroleum and/or solvent odors potentially related to
possible releases.
For all borings, a photoionization device (PID) equipped with a 10.6eV lamp will be used to screen the soil
for VOC emissions typically associated with petroleum and volatile off -vapors and to select the soil interval
possibly adversely impacted for laboratory analysis. PID readings will be collected directly from the soil
core removed from the boring soon after collection. As the plastic -encased soil samples are removed from
the boring, they will be marked for depth -intervals at each end and laid on the ground, on plastic sheeting,
near the borehole. After collecting the samples, the driller will use a special GeoProbe razor -knife to slice
a small section from the plastic liner tube so that the soil can be directly examined and PID readings
collected. The field technician will insert a field -decontaminated screwdriver directly into the soil sample
at approximately one -foot intervals to create a hole and subsequently insert the PID probe into the hole to
collect a PID reading directly from the extracted soil. In addition, representative portions of the soil will be
collected into plastic Ziplock baggies, labeled with the boring number and depth interval, and allowed to
warm up for approximately 15 minutes before collecting a PID reading by puncturing the baggie and
inserting the PID probe. Finally, a borehole PID reading will be collected by inserting the PID probe directly
into the top of the borehole after its completion and subsequent to removal of the soil sampling equipment.
Each of these PID readings will be recorded in the field notes and used to select the sample interval for
laboratory submission.
The PID will be rented from Geotech Environmental Equipment, Inc. and calibrated by a certified Geotech
technician. A calibration certificate for the unit will be provided in the assessment report. In addition, boring
logs and temporary well construction details will also be prepared for submittal.
Groundwater Sampling Details
Subsequent to collection of the soil samples, the borings will be further advanced into the groundwater such
that temporary groundwater monitoring wells can be installed. 1.25-inch diameter PVC wells will be
constructed with 10-feet of 10 slot screen material installed such that the screened interval brackets the
stabilized water table. Subsequently, new, disposable polyethylene tubing will be inserted into each
temporary well location and a peristaltic pump used to slowly remove a minimum of three volumes of
groundwater or until the sample location fails to generate groundwater due to extremely slow recovery.
Groundwater samples will be decanted directly into laboratory -provided glassware beginning with the
HCL-preserved 40 ml VOC bottles. Subsequently, two one -liter bottles (for SVOC analysis) and one 250
ml HNO3-preserved plastic bottle will be filled for metals analysis.
The groundwater samples will be transported under chain -of -custody protocols and shipped overnight to
Prism Laboratories. The samples were analyzed for VOCs by Method 8260B, SVOCs by Method 8270,
and the eight RCRA metals, except as noted above. The laboratory will be instructed that their analytical
procedures' detection limits needed to be less than the applicable North Carolina Groundwater Quality
Standards and the IHSB residential VISLs.
Soil and Groundwater Analyses
Soil and groundwater samples will be submitted to Prism Laboratories, Inc. in Charlotte. Prism is a North
Carolina certified laboratory (certification number 402). The samples will be analyzed for volatile organic
compounds (VOCs) by Method 8260B, semi -volatile organic compounds (SVOCs) by Method 8270, and
the eight RCRA metals and hexavalent chrome by Method 7199. We do not anticipate limitations on the
Smokey Hollow 2 -Site Assessment Work Plan February 26, 2019
Page S
potential contaminants of concern, which are suspected to petroleum -related compounds and possibly
chlorinated solvents. The laboratory will be contacted prior to sample receipt to assure that their analytical
procedures' Reporting Limits/Method Detection Limits meet the applicable screening criteria of the IHSB
program's Preliminary Soil Remediation Goals and/or Protection of Groundwater and the IHSB residential
VISLs (for soil) and Water Quality Standards to the extent feasible. Level II QA/QC will be also requested.
J-Flags will be included in the laboratory reports.
Soil and Groundwater QA/QC
Standard quality assurance/quality control (QA/QC) processes will be used during the assessment activities.
Non -dedicated sampling equipment, including the water -level probe, will be decontaminated using
Liquinox® detergent and deionized water prior to and between each sampling location. Sampling personnel
will wear disposable nitrile gloves while handling samples and collecting depth -to -water measurements.
New polyethylene tubing will be used at each groundwater sampling point. Samples will be collected into
laboratory -provided glassware or specified containers based on the analysis requested and to ensure that
the laboratory has sufficient sample volume for MS/MSD analyses. Samples will be shipped overnight by
courier to the analytical laboratory in laboratory -provided, ice -filled coolers under chain -of -custody
protocols.
Quality assurance/quality control (QA/AC) samples will be included in the sample delivery groups of soil
and groundwater samples submitted to the analytical laboratory to assure that the data obtained are
defensible and reproducible. Specifically, a minimum of one (1) duplicate per 20 samples, per media, per
analytical method will be submitted for analysis. In addition, one (1) trip blank will be submitted for VOC
analysis per cooler. Detailed records of equipment calibration and well gauging, purging, and sampling data
were maintained by PES personnel at each sample location.
The laboratory analytical report, chain -of -custody records and field notes will be evaluated to ensure that
the reported results were valid, accurate and sufficient to meet quality objectives. Accuracy will be
evaluated through the assessment of laboratory -spiked recoveries and precision will be evaluated through
the assessment of duplicate results.
Soil Gas Testing
We will collect five (5) sub -slab (sub -pavement) soil gas samples at the locations shown on Figure 4. The
sampling points were selected to be in and around areas where elevators will eventually be installed and are
also intended to give good overall coverage to assess for possible vapor intrusion impacts
• We will collect sub -slab soil gas samples from five (5) locations beneath the existing slab foundations
or paved areas. The sample locations are identified as 1 through 5 on Figure 4. (Temporary wells will
be installed in three of the same locations —1, 3 and 5.)
• A hammer drill will be used to bore 5/8-inch diameter holes through the slab to the soil beneath
(approximately 1-foot depth). Thickness of concrete slab or paving and underlying soils/fill material
depths/characteristics will be noted.
• Vapor Pins® fitted with silicone sleeves will be secured into each boring using a special tool and rubber
hammer. And each Vapor Pin location will be allowed to equilibrate for at least 1 to 2 hours.
• The samples will be collected using 1/4-inch rigid Teflon tubing and 400-mL Summa canisters (1-L
canisters may be used, pending lab availability). Small 1- to 2-inch pieces of 1/4-inch and 3/8- inch
Tygon or silicone tubing will be employed to make connections to various valves and fittings of the
sampling trains. Tubing will be connected to the barbed fitting of the Vapor Pins, routed through a
Smokey Hollow 2 -Site Assessment Work Plan
February 26, 2019
Page 6
plastic shroud (to be placed over the probe site) and the other end connected to a 3-way valve and 60-
milliliter (mL) syringe to form a sampling train for each sample location.
• A shut-in test will be performed to ensure air tight conditions. Subsequently, once the sampling train
is deemed leak -free, the probe tubing will be purged of three dead volumes using a 60-ml syringe and
leak checked while the shroud is filled with helium. Assuming 1.5 feet of 1/4-inch tubing (inner
diameter of 0.177 inches), three dead volumes equals 22 mL. (Note - up to 120 mLs may be purged to
ensure sufficient volume for the helium leak check, described below).
• The helium concentration within the shroud will be measured and noted using a MGD-2002 leak
detector (or equivalent monitor). The purged soil gas will be collected into a 0.5-L Tedlar bag. After
purging, the Tedlar bag will be removed and the contents monitored for helium levels. A successful
leak check is deemed when the purged soil gas contains less than 5% of the initial shroud concentration
of helium. If helium concentrations exceed 5% in the purged soil gas, adjustments will be made to
achieve leak -free conditions, and/or a new Vapor Pin location will be installed and tested.
• While the sampling train cannot be enclosed in the shroud for leak check purposes while operating the
syringe, the shut-in test provides assurance that the connections are leak free and the leak detector will
be used to spot check possible leaks at connection joints.
• If no leaks are detected, the canister sampling can begin at each of the sample locations.
• Each of soil gas samples will be collected using canisters fitted with 100 to 200 nil/min flow regulators
over a period of approximately two to 10 minutes (depending on the canister sizes).
• Following completion of sampling, a post -sampling helium leak check will be performed.
• After a successful leak check, the probe tubing and Vapor Pins will be removed from each and the
borings will be grouted flush to the slab foundation level with cement.
• Upon completion of the sampling and probe finalization, laboratory analysis request forms will be
prepared, and the samples shipped under proper chain of custody for laboratory analysis using EPA
Compendium Method TO-15 "Determination of Volatile Organic Compounds (VOCs) in Air
Collected in Specially -Prepared Canisters and Analyzed by Gas Chromatography/Mass Spectrometry
(GUMS)". (Note — since a post -sampling leak check will be conducted, helium analysis by the
laboratory is not required.)
• We will confirm that the certified lab reporting limits will meet the current Sub -Slab and Exterior Soil
Gas Screening Levels.
• The full TO-15 list of analytes will be requested to be analyzed for the soil gas samples plus one
duplicate sample.
INVESTIGATION DERIVED WASTE MANAGEMENT
All investigation -derived waste (IDW), anticipated to be soil and groundwater at this time, will be
containerized, properly labeled and left onsite until the analytical results are received. Based upon the
analytical results, the IDW will either be thinly spread on the site or will be properly disposed of offsite.
REPORTING
Report
A report will be prepared that includes, at a minimum, the following:
• A summary of the site work conducted for all sections outlined in this Work Plan;
Smokey Hollow 2 -Site Assessment Work Plan
February 26, 2019
Page 7
• A summary of the findings and possible recommendations;
• Applicable tables and figures outlined below with the addition of:
o Table(s) for tabulated analytical data per media sampled and analyzed, compared against
applicable standards and screening levels;
o Figure(s) depicting actual sample locations collected, with each media depicted in the
legend, to include a graphic scale and north arrow; and
o Groundwater potentiometric map, with graphic scale and north arrow,
• Firm PE/PG License Number
• Individual PE/PG seal & signature
• Table 1 — Proposed Sample Locations and Analyses that includes:
o Sample ID
o Sample Objective
o Proposed Depth(s)
o Analytical Method(s)
o QA/QC Samples
o Background Samples
• Figure 1 — Site Location Map
o Site location on a topographic map base.
o Graphic scale and north arrow
• Figure 2 — Site Map
o Buildings
o Historical sample locations
o RECs or other areas of concern
o Proposed sample locations
o Sample Identification labels
o Background Sample Locations
o QA/QC Samples
o Graphic scale and north arrow
o High quality aerial base map
• Figure 3 — Proposed Development
o Overlay of historical and proposed sample locations,
o Graphic scale and north arrow.
CLOSING
Aptus appreciates the opportunity to provide this proposed assessment. If we can answer any questions or
provide additional information, please feel free to contact us at your convenience.
Smokey Hollow 2 -Site Assessment Work Plan
February 26, 2019
Page 8
If you have any questions on the environmental -related work, please feel free to contact me.
Sincerely,
APTUS MANAGEMENT PLLC
John Gallagher, P.E., RSM
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FIGURES
APPRO (MATE
0 2000 4000
SCALE IN FEET
Figure 1 -Site Location Ma Source: USGS 7.5 Minute Topographic Map Raleigh East, North Carolina
9 p Quadrangle 2013
PESPROCTOR SMOKEY HOLLOW 2 PROJECT SITE
ENVIRONMENTAL 0, 506, 516, 520 N. WEST & 413, 437 & 441 N. HARRINGTON ST.
`� SERVICES, INC. NCBP PROJECT NO.22062-18-092
h
Legend:
2 Figure ID No.
Figure 2 — Site Plan Source: Wake County GIS Base Map Scale: 1" = 165'
r\ PROCTOR SMOKEY HOLLOW 2 PROJECT SITE
PES ENVIRONMENTAL 0, 506, 516, 520 N. WEST & 413, 437 & 441 N. HARRINGTON ST.
�� SERVICES, INC. NCBP PROJECT NO.22062-18-092
REFERENCES: 5L;AL1=: -I:b4U
1. 2010 AERIAL IMAGERY, PARCEL BOUNDARY Feet
AND ROAD DATA FROM WAKE COUNTY GIS.
2. MID -ATLANTIC FIELD NOTES. 0 35 70 140
DRAWN Jri
DATE:
MID —ATLANTIC
ASSOCIATES, INC.
SOIL BORING AND TEMPORARY
MONITORING WELL LOCATION MAP
1.21 ACRE COMMERCIAL TRACT
BY:
FEBRUARY 2013
DRAFT
CHECK:
JOB NO:
000R2444.01
ENG.
CHECK:
GIS NO:
02G-R2444.01-2
Engineering & Environmental Solutions
437 & 441 NORTH HARRINGTON STREET
RALEIGH, NORTH CAROLINA
APPROVAL: j4
DWG NO: 2
Legend:
O Proposed Sample Location
Figure 4 - Proposed Sample Locations Source: Google Earth, 2018 Scale: 1" =115'
AF I US Management, PLLC SMOKEY HOLLOW 2 PROJECT SITE
NCBP PROJECT NO. 22062-18-092
xx