CCB0053_CA_Correspondence_20010918

ECHNOLOGICAL
'1ERVICES
C®
September 18, 2001
Mr. William Hocut
NC Division of Environment and Natural Resources (DENR)
Solid Waste Section
401 Oberlin Road
Raleigh, North Carolina 27605
RE: "Race Park USA"
Regulatory requirements
7836 NC Highway 150 East
Mooresville, North Carolina
GTSI-10123
Dear Mr. Hocut,
the owners, Race Park U.S.A., Ground Technological Services Inc. (GTSI) has
On behalf of ualit control services for the referenced site in
performed field observations and field density q Y
accordance with the NCDENR 15A-13B.17. "Conditioned Ash Restrictions".
e proposed construction consists of several commercial structures, a go-cart track and
The 13.72-acre p p areas, Controlled conditioned ash structural fill was
associated impervious driveway and parking roduct was provided from the nearby
installed within two drainage swales. The coal combustion by-p
Marshall Steam Station.
"strippingand grubbing" of surficial top soils and plant sat laced within a steep gully in
ls to firm bearing soils,
Following
GTSI visually verified the removal of domefrolling wasrash anperformed on June 25, 2001 prior to structural
the southeastern quadrant of the site. Pr for repeated traverses
fill installation. The proofroll procedure utilized loaded, heavy equipment ing soils
undercut areas, with no pumping or rutting indicative of soft
° noted at the base of the
across the final
noted. Clean, firm bearing residual soils were noted, with no staining or
undercut.
Jul 3 2001 included groundwater measurements withinh °podwater fluctuations
es
Prior work on yof
summarized in our report dated July 6, 2001. g indicators GTSIsorecomn ended, and the contractor
ENR
were noted below 6.0 feet below existing grade.to meet the recently
implemented, the additional installation of 2.0 feet of earthen ell level. We understand no fly ash was
8.0-foot vertical separation from the seasonal lug groundwater
installed within the eight -foot groundwater separation criteria.
PO. Box 2246 - Huntersville, NC 28070 - Phone [phone] - Fax [phone]

September 18, 2001
Page 2
GTSI performed field density testing in conjunction with structural fill operations from elevations
ranging from —10.0' below subgrade to final design subgrade elevation. A total of thirty-seven (37)
field density tests were performed utilizing the Shelby Tube Method, (ASTM D-2937). All tests or
final retests indicated densities meeting or exceeding the project design criteria of 95% of Standard
Proctor Moisture density relationship (ASTM D-698) at the depths and locations tested.
It is our understanding the site included wet hillside seeps in the central, lower elevation portion of
the site, with impact mitigation associated with a US Army Corps of Engineers Nationwide Permit
and a DENR 401 Water Quality Certification implemented. The permitting work was performed by
Len Rinder and submitted to Steve Chapin with the USACE Asheville Office and Pete Caldwell with
the DENR Mooresville Regional Office.
In conjunction with the project Engineer, Lee Dowell, and Len Rindner, wetland scientist, silt fencing,
rock dams, a stormwater/wetpond and a sediment fore bay was installed to separate the work area
from down gradient drainage features including an off -site pond.
The ash materials were installed in 12" moisture -conditioned structural lifts, with a 12-24" earthen
structural fill cap compacted to subgrade elevation. Water trucks were utilized during the structural
ash fill installation for dust control measures and to facilitate adequate compaction. A total of
approximately 54,000 tons of conditioned ash materials were installed.
All tests or final retests met or exceeded the project design criteria of 95% of the (maximum)
Standard Proctor Moisture -Density Relationship, ASTM D-698. Following earthwork, the disturbed
areas were seeded with grass.
GTSI noted average slope of side slope areas appeared to comply with the maximum 3:1 slope
guidelines, and a well -established growth of grass covering disturbed areas was observed. No ponded
areas were noted following inclement weather. Implementation of setback guidelines included 25'
from property lines and bedrock outcrops and 50' from jurisdictional Waters of the U.S.
One (1) offsite water supply well was separated from the 100-foot mandated ash fill setback in
accordance with DENR regulations.
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ERVICES
J,;j NC.

September 18, 2001
Page 3
If you should have any questions, please call us at your convenience.
Sincerely,
Ground Technological Services, Inc.
yes'
Geoff Underwood
Staff Geologist
$ - ll%wo;
GaryL. dechter P.G. �B29,nQ
President
4='�Asr
L021927
Karen E. Heater,
Project Engineel,, 's°
c.c. Dean Johnson
Ash Basics Company
ROUND
J ECHNOLOGICAL
ERVBCES
` NC.