2509_CRSWMAdrillplan_DIN26024_20160428.pdf

2211 West Meadowview Road
Suite 101 Greensboro, NC 27407

tel: [phone] fax: [phone]
www.JoyceEngineering.com
April 28, 2016

Christine Ritter, P.G., Hydrogeologist
Division of Waste Management- Solid Waste Section
NC Department of Environmental Quality
1646 Mail Service Center
Raleigh, NC 27699-1646

RE: Coastal Regional Solid Waste Management Authority’s Tuscarora Landfill
Phase 4 Expansion Drilling Program
JOYCE Project No. 618.1602.12, Task No. 01
Dear Christine:

On behalf of the Coastal Regional Solid Waste Management Authority (CRSWMA) Joyce
Engineering (JOYCE) is submitting this drilling and sampling plan for the proposed Phase 4
MSW landfill expansion. This plan is prepared to address the requirements of the Rule .1623 for
geologic and hydrogeologic investigations for MSW landfills.

The hydrogeologic field investigations will provide the data needed to complete the Design
Hydrogeologic Report for the 17.7-acre Phase 4 expansion. This will include the installation of
11 piezometers within the proposed footprint of Phase 4 and six monitoring wells in the
compliance area outside of the footprint for future monitoring of Phase 4. Most of the
piezometers and wells will be constructed as nested pairs (one shallow and one deep in close
proximity). The shallow wells/piezometers are expected to average 15 feet deep and will be
screened in the upper-most aquifer, while the deeper wells/piezometers are expected to average
40 feet deep and will be screened in the deeper aquifer. Actual depths may vary based on
conditions encountered during drilling. The attached drawing shows the approximate proposed
locations of the wells and piezometers and the attached table summarizes the proposed drilling
plan.

There are currently five existing monitoring wells inside the Phase 4 footprint and two more that
are less than 20 feet outside of the footprint. The proposed new wells and piezometers will bring
the total number of borings in (or very near) the footprint to 18, or 24 if the compliance area is
included.

The proposed drilling plan is designed for a Geoprobe drill rig that can perform both direct-push
and auger drilling. In lieu of continuous split-spoon sampling, we propose first collecting
continuous Geoprobe soil cores to the desired total depth (typically 40 feet) at each drilling
location, and then going back with hollow-stem augers to install the wells or piezometers. This
will provide a more accurate determination of the stratigraphy, including identifying the clay
Christine Ritter
April 28, 2016
Page 2 of 2

aquitard which separates the upper and lower aquifers at this site. For locations with a nested
pair, both the shallow and deep wells/piezometers will be drilled to a target depth and screened
based on the stratigraphy observed in the soil core. During the auger drilling, we will collect one
or two targeted split-spoon samples with Standard Penetration Test (STP) to confirm the
characteristics of the soil. Shelby-tube samples will be collected for geotechnical testing from
selected borings based on the soil core data.

Lithological and geotechnical data will be collected from the borings during drilling, including
collection of approximately eight Shelby-tube samples for geotechnical laboratory testing. The
Shelby-tube samples will be tested for the following parameters:
• Particle Size / Hydrometer Analysis (ASTM D 422);
• Water Content (ASTM D 2216);
• Unified Soil Classification (ASTM 2487);
• Atterberg Limits (ASTM D 4318);
• Flex Wall Permeameter (ASTM D 5084) (2-3 tests); and
• Consolidated Triaxial Shear (ASTM D 4767) (1 test).

One comprehensive set of groundwater level measurements will be obtained after the
wells/piezometers are installed. These water level data, in conjunction with the historical water
level data from the site, will be used to create a seasonal high water table and a long-term high
water table map. Slug tests will be performed on selected wells/piezometers to determine the
hydraulic conductivity of the shallow and deep aquifers.

These data will be used to demonstrate compliance with vertical separation requirements,
establish foundation characteristics, and provide more detailed understanding of the
hydrogeologic regime beneath the Phase 4 footprint. This information is needed for landfill
design requirements and to aide in the design of an effective water quality monitoring system.

If you have any questions during your review of the proposed drilling plan, please contact either
me or Van Burbach at [phone].

Sincerely,
JOYCE ENGINEERING, INC.

Hannu Kemppinen, P.G.
Senior Project Consultant

Attachments: Table - Proposed Phase 4 Drilling Program
Drawing - Proposed Phase 4 Boring Locations

cc: Bobby Darden, CRSWMA
Alex Everhart, Joyce Engineering
CRSWMA Tuscarora Landfill
Permit # 25-09 Joyce Engineering
Drilling MW/PZ Total Depth Screen Stick-up Geoprobe Split-spoons Shelby Surface
Location ID (Feet)(Feet)(Feet)Cores w SPTs Tubes Completion
PZ-40 S 15 10 3 1-2 No
PZ-40 D 40 10 3 60' continuous 2 No
PZ-41 S 15 10 3 1-2 No
PZ-41 D 40 10 3 40' continuous 2 No
PZ-42 S 15 10 3 1-2 No
PZ-42 D 40 10 3 60' continuous 2 No
PZ-43 S 15 10 3 1-2 No
PZ-43 D 40 10 3 40' continuous 2 No
PZ-44 S 15 10 3 1-2 No
PZ-44 D 40 10 3 40' continuous No
6 PZ-45 15 10 3 20' continuous 1-2 No
MW-20 S 15 10 3 20' continuous Yes
MW-20 D 40 10 3 40' continuous Yes
8 MW-21 15 10 3 20' continuous Yes
MW-22 S 15 10 3 20' continuous Yes
MW-22 D 40 10 3 40' continuous Yes
10 MW-23 15 10 3 20' continuous Yes
TOTALS:430 170 51 420 7-14 8 6
Continuous Geoprobe cores in all deep borings and in three single shallow borings,
followed by hollow-stem auger installation of wells/piezometers at each drilling location.
One or two optional split-spoon samples with SPTs in selected auger borings.
Shelby-tube samples in selected borings.
(Note that two of the PZ and four shallow MW geoprobe cores will extend deeper than the PZ/Well will be installed.)
Total Geoprobe cores:420 feet
Total HSA drilling with 1-2 split-spoons per boring:90 feet
Total HSA drilling with geoprobe cores:355 feet
Estimated total PVC pipe (screen & riser, including 3' stick-up):496 feet
MW/PZ construction must be done inside of augers to avoid boring collapse.
Surface completions for MWs include an above-ground steel cover and a 2'x2'x6" well pad.
PZs will be left as PVC stick-up.
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CRSWMA Phase 4 - Proposed Drilling Program
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LEGENDEDGE OF LINER PAVED ROAD EXISTING 2 FT CONTOUR EXISTING 10 FT CONTOURGRAVEL ROADGROUNDWATER MONITORING WELL LOCATION,IDENTIFICATION, AND GROUNDWATER ELEVATION POINT IN TIME GROUNDWATER CONTOUR(APPROXIMATE) 1 FT. CONTOUR INTERVALGROUNDWATER FLOW PATHWAY USED TOCALCULATE HYDRAULIC GRADIENTi1SEGMENT USED FOR GRADIENT CALCULATIONSURFACE WATER MONITORING LOCATIONSAND IDENTIFICATIONS1.PIEZOMETERS AND MONITORING WELLS SCREENED IN THE DEEP AQUIFER DO NOT HAVE WATER LEVEL ELEVATION LABELS.2.STATIC WATER LEVELS MEASURED ON OCTOBER 20 AND 21, 2015.3.GROUNDWATER CONTOURS BASED ON LINEAR INTERPOLATION BETWEEN AND EXTRAPOLATION FROM KNOWN DATA,TOPOGRAPHIC CONTOURS, AND KNOWN FIELD CONDITIONS. THEREFORE, GROUNDWATER CONTOURS MUST BE ASSUMED TOBE APPROXIMATE.4.GROUNDWATER ELEVATIONS ARE MEASURED IN FEET AND REFERENCED TO MEAN SEA LEVEL.NOTES 46LEACHATE MONITORING LOCATION ANDIDENTIFICATION
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MW-21PZ-45 PROPOSED MONITORING WELL LOCATION AND IDENTIFICATIONPROPOSED PIEZOMETER LOCATION AND IDENTIFICATION
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All rights reserved.
Ó Joyce Engineering, Inc.
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L:\CRSWMA\dwg\2016 PHASE 4 EXPANSION\HYDROGEO\DRILLING MAP FINAL.dwg Layout=Layout1
2211 W. MEADOWVIEW ROAD
GREENSBORO, NC 27407
PHONE: [phone]
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CRSWMA: TUSCARORA LANDFILL
TUSCARORA, NORTH CAROLINA
2016
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PROPOSED MONITORING WELL AND
PIEZOMETER LOCATION
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NC CORP LIC: C-0782