HomeMy WebLinkAbout9205_TownWakeForestclosedMSWLF_GWassessmentplan_DIN28571_20171007
Engineering Stability Since 1881
310 Hubert Street
Raleigh, North Carolina 27603‐2302 I USA
T 919.828.3441 I F 919.522.0304
NC License #F‐0266
FROEHLING & ROBERTSON, INC.
Corporate HQ: 3015 DUMBARTON ROAD RICHMOND, VA 23228 USA T 804.264.2701 F 804.264.1202 www.fandr.com
VIRGINIA • NORTH CAROLINA • SOUTH CAROLINA • MARYLAND • DISTRICT OF COLUMBIA
A Minority‐Owned Business
October 7, 2017
Ms. Christine Ritter
North Carolina Department of Environmental Quality
Division of Waste Management
1646 Mail Service Center
Raleigh, North Carolina 27699‐1646
Reference: Groundwater Contaminant Delineation Work Plan
North White Street Landfill
Wake Forest, Wake County, NC
Permit #9205‐MSWLF‐1980
F&R Project #66S‐00182‐0001
Dear Ms. Ritter:
Froehling & Robertson, Inc. (F&R) is pleased to submit this Work Plan to perform groundwater
contaminant delineation activities at the North White Street Landfill Wake Forest, Wake County,
North Carolina. The goal of this phase of work is to delineate the horizontal and vertical extents
of certain contamination plume(s) that might be associated with historical activities conducted
at this closed, unlined MSW landfill. Delineation is required when impacts are documented
through consistent groundwater exceedances in accordance with Title 15A NCAC 2L (2L)
regulations; and, in compliance with the NC DEQ Division of Waste Management, solid Waste
Section’s recent request for a Correction Action Plan (CAP), dated June 15, 2017. The results of
this assessment are intended to provide the information necessary to produce that CAP.
Should you have any questions concerning this Work Plan, please contact our Raleigh office 919‐
828‐3441.
Sincerely,
FROEHLING & ROBERTSON, INC.
John Palmer, P.G. Benjamin A. Whitley, P.E
Senior Geologist GeoEnvironmental Services Manager
Enclosure: Figure 1 – Proposed Well Location Map
Figures 2A and 2B – Type II and Type II Monitoring Well Diagrams
NCDEQ – Division of Waste Management North White St GW Delineation Work Plan
F&R Project #66S‐00182‐0001 2 October 2017
1.0 GENERAL CONDITIONS
The North White Street Landfill (the Facility) is located south of Moultonboro Avenue, in the
Town of Wake Forest (the Town), Wake County, North Carolina. The Facility is located within
Parcel #1851166351, and may be accessed by an asphalt/unpaved access road leading in to the
former MSW landfill from North White Street. The upper surface of the landfill is currently
utilized as a NC DEQ‐approved, police firing range. The majority of the properties surrounding
the landfill tract are owned and managed by the Town; excepting that the eastern boundary
consists of two tracts, an undeveloped parcel to the southeast and the undeveloped portion of a
residential tract to the northeast. Hatter’s Branch forms the eastern boundary of the Facility
property, and un‐named tributaries to Hatter’s Branch drain both the surface of the Facility
property, and the Town’s additional parcels to the south.
The Facility currently conducts semi‐annual groundwater monitoring as required by the North
Carolina Department of Environmental Quality (NC DEQ), Division of Waste Management
(DWM), and authorized by the Town of Wake Forest. Eight existing monitoring wells (MW‐1R to
MW‐6, MW‐7S and MW‐7D) comprise the facility’s groundwater monitoring network, as
illustrated in Figure 1, Proposed Well Location Map. The site location map and sampling
locations can be found on Figures 1 and 2 in Appendix A.
2.0 SCOPE OF WORK
This work is to be conducted by F&R and its subcontractors for the Town of Wake Forest:
Clear access paths to the planned monitoring well locations for future monitoring /
remediation utilization.
Advance a total of eight borings in the approximate locations. Collect those soil samples
for geotechnical testing necessary to perform hydrogeologic evaluation of the underlying
aquifer(s).
Install a total of eight groundwater monitoring wells in the borings described above. Two
of the wells will be completed as deep monitoring points, two of the wells will be completed
NCDEQ – Division of Waste Management North White St GW Delineation Work Plan
F&R Project #66S‐00182‐0001 3 October 2017
as shallow monitoring points, and four of the wells will be completed as shallow temporary
lateral evaluation monitoring points.
Collect groundwater samples from the eight new monitoring wells, and submit same for
expedited analytical review for volatile organic compounds (VOCs).
Upon receipt of analytical data, conduct further delineation via additional wells, or
immediately abandon lateral evaluation wells.
Perform water level recovery (slug) tests within a minimum of four of the new wells to
determine in‐situ properties of the underlying aquifers, estimate hydraulic conductivity (K), and
calculate groundwater velocities in the vicinity of the new wells.
Survey new assessment monitoring wells for vertical elevation and horizontal coordinates
include existing wells MW‐7S and MW‐7D.
Collect static water levels in new and existing wells, utilize the elevation data determined
through survey, and prepare a site‐wide potentiometric map.
Interim results of the field work will be communicated to the NC DEQ. Formal reporting is
expected to occur within the upcoming CAP.
3.0 DESCRIPTION OF FIELD ACTIVITIES
ACCESS CLEARING
F&R will flag proposed borings locations using hand‐held GPS technology prior to any clearing
effort. F&R anticipates that the Town will provide the necessary heavy‐equipment to clear access
paths to proposed drilling locations. Following well installation activities, the access paths will
be seeded and lightly mulched by Town personnel in an effort to control runoff/sedimentation,
and to comply with the facility’s existing erosion control plan.
GROUNDWATER MONITORING WELL INSTALLATION
F&R’s drilling subcontractor will advance a total of eight borings in the approximate locations
illustrated in Figure 1. F&R anticipates that two of the borings will be completed as Type II
NCDEQ – Division of Waste Management North White St GW Delineation Work Plan
F&R Project #66S‐00182‐0001 4 October 2017
permanent groundwater monitoring wells (designated as MW‐1RR and MW‐3R), and four of the
borings will be completed as Type II temporary groundwater monitoring wells (designated as
MW‐1A, MW‐1B, MW‐3A, and MW‐3B) to assess contaminant impacts in the shallow portions of
the unconfined aquifer overlying the fractured. F&R proposes to initially install wells MW‐1A,
MW‐1B, MW‐3A, and MW‐3B as temporary monitoring wells; and, to reserve the option to
convert these well locations to permanent well status based upon observed conditions within
the unconfined aquifer (i.e., groundwater conditions identified by the laboratory above 2L
Standards). Any temporary groundwater monitoring well not converted to permanent status will
be abandoned following well sampling activities according to Title 15 A Subchapter 2C (2C)
protocol.
F&R further anticipates that two of the borings will be completed as deep groundwater
monitoring wells (designated as MW‐1D and MW‐3D to assess contaminant impacts within the
fractured rock portions of the lower unconfined aquifer. F&R has reviewed well installation
records for existing monitoring well pair MW‐7S and MW‐7D. Based upon the limited description
of depth to consolidated bedrock presented in Marshall Miller & Associates November 2001
report, F&R will reserve the option of installing either Type II or Type III groundwater monitoring
wells at the two proposed deep well monitoring points based upon observed field conditions.
Continuous flight augers in the soil, and air rotary in the rock portions of the aquifer(s) are the
preferred drilling methods for the proposed boring operations. An F&R geologist or engineer will
supervise the drilling subcontractor during field operations; determine well types, screen
intervals, sample collection depths, and log the borings using the USCS classification system. As
previously discussed, monitoring wells are expected to be of both Type II and Type III
construction, well schematics are included as Figures 2A and 2B.
GROUNDWATER SAMPLING
F&R will collect groundwater samples from the eight new groundwater monitoring wells
introduced above. Static water level readings will be recorded from the top of the casing using
an electronic water level indicator, and recorded in the field log. The length of the water column
will be determined, and the well water volume will be calculated. Following the static water level
survey, each monitoring well will be purged prior to sampling to provide a representative sample
of the aquifer water(s). To achieve a representative sample, the water quality will be monitored
for stabilization of the following parameters:
NCDEQ – Division of Waste Management North White St GW Delineation Work Plan
F&R Project #66S‐00182‐0001 5 October 2017
pH: +/‐ 0.1 Standard Units
Specific Conductance: +/‐ 10% µS/cm
Temperature: +/‐ 1° C
Turbidity: < 10 NTUs
To minimize drawdown within the monitoring well, purging rates will be adjusted to the observed
well recovery rate. Once stabilization parameters have been met, F&R will collect a groundwater
sample from each well and submit the sample for laboratory analysis of VOCs by SW‐846 Method
8260B (standard suite of parameters). For QA/QC purposes, one duplicate sample will be
prepared; as such, a total of nine groundwater samples will be submitted for analytical review.
The samples will be submitted to the laboratory on expedited turn. As such, the results can be
received and reviewed within that period of time allotted by the 2C well abandonment Standards.
GEOTECHNICAL SAMPLING
During monitoring well construction, F&R will collect those soil samples for geotechnical testing
necessary to perform subsequent hydrogeologic evaluation of the underlying aquifer(s). Soil
samples will be collected from selected intervals, and submitted for grain size and analysis by
hydrometer methods. Grain size data will be utilized in calculating effective porosity for the
screened intervals of the surficial aquifer.
SURVEY SERVICES
Utilizing the known elevation at existing monitoring well MW‐3 as a benchmark, the new permanent
wells will be surveyed for X, Y, Z coordinates (i.e., vertical elevation to 0.01 foot accuracy, and
horizontal coordinates to 1.0 foot accuracy). In addition, existing groundwater monitoring well
locations MW‐7S and MW‐7D will be surveyed, such that these locations may be utilized in this, and
future groundwater monitoring events.
SLUG TESTING
A minimum of four of the new wells will be slug tested to determine in situ properties within the
underlying aquifers. Slug test data will be reduced, hydraulic conductivity (K) will be estimated, and
groundwater velocities in the vicinity of each well will ultimately be calculated.
NCDEQ – Division of Waste Management North White St GW Delineation Work Plan
F&R Project #66S‐00182‐0001 6 October 2017
POTENTIOMETRIC SURFACE MAP
Upon stabilization, the eight new wells installed under this phase of delineation efforts will be
measured for depth of water from the top of the well casing, and from the ground surface in the
vicinity of the well. In addition, the existing facility wells will likewise be measured, the results of
groundwater measurements will be converted to elevations, and a site‐wide potentiometric map
will be generated.
4.0 INTERIM REPORTING
Upon completion of the work, interim evaluation results will be communicated to the NC DEQ as
required by your agency. Formal reporting will be completed within the upcoming CAP. This
delineation effort is intended to supply that data necessary to prepare the NC DEQ‐requested CAP.
5.0 PROJECT SCHEDULE
Field activities will commence as soon as practicable following receipt of NC DEQ approval of this
Work Plan. F&R anticipates that the boring and monitoring well construction activities can be
completed in approximately five working days, weather permitting, and following clearing efforts
by the Town of Wake Forest. Analytical testing will be expedited to a three day turn‐around, and
the NC DEQ will be notified of the results promptly for the purpose of discussion and guidance on
permanent well conversion and/or abandonment. It is anticipated that well surveys can be
scheduled within one week of construction, and accomplished in one day.
End of Plan
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448382450452MW‐1MW‐2MW‐4MW‐3MW‐6MW‐5NAD 1983 StatePlane North Carolina FIPS 3900 (Feet)Client:Project:LocationF&R Project No.:Data:Date:Proposed Well Location MapScale:1:3,6001 inch = 300 feetFIGURENo.:Town of Wake ForestWake Forest, Wake County, NCNC GIS 2014August 20170 300 600 900 1,200150FeetNorth White Street Landfill66S‐0182FROEHLING & ROBERTSON, INC.310 Hubert StreetRaleigh, North Carolina 27603‐2302 I USAT 919.828.3441 I F 919.828.5751ÜDisclaimer: F&R makes no warranties or guarantees regarding the accuracy orcompleteness of geographic features shown on this map. Spatial accuracy ofmeasurement provided by source agencies can be obtained by contacting F&R.Engineering Stability Since 18811Legend@AProposed Monitoring Well@AExisting Monitoring WellsWSurface Water SampleKKKKKTree LineContour Wake40