20230414_Narrative_Calcs

MINING PLAN
NARRATIVE AND CALCULATIONS
for
US 421 TRACT
NEW HANOVER COUNTY, N.C.
PREPARED FOR
421 Sand Mine LLC
PO Box 100
Winnabow, NC 28479
a SEAL
43166
Adam Grady,PE
Hanover Design Services, PA
1123 Floral Parkway
Wilmington, NC 28403

MINING PLAN
For
Tree Shaker Sand Mine
421 Sand Mine, LLC
NARRATIVE
NOTE: To be reviewed in conjunction with "Site Plan Tree Shaker Sand Mlne", Hanover Design
Services, PA, Drawings Nos. 11936 TS Sheets 1-6.
PROJECT DESCRIPTION—
The purpose of this project is for the removal of borrow material. The Mining Plan is to identify
measures to be implemented to minimize impacts on neighboring properties by controlling
erosion during construction and by reclaiming the project site throughout the duration of
excavation and once the mining is complete.
The site is located off Hwy 421,3.32 miles north of 1-140. The total project area is 90.16 acres,
88.55 acres of which are proposed to be disturbed for excavation. The site is wooded with fairly
gently sloping topography. There are no proposed buildings or structures. The mine will operate
between the hours of 7:00 a.m.to 6:00 p.m.seven days per week as needed. There is ample room
for vehicles to pass along the existing access road as well as ample turn around areas on the
mining parcel.
SOILS—
(Soils Map attached)

PLANNED EROSION AND SEDIMENT CONTROL PRACTICES-
1. TEMPORARY GRAVEL CONSTRUCTION ENTRANCE
Practice 6.06
Shall be installed as shown on the plan or from any existing paved roadway. Drainage is away
from the road and sedimentation will be controlled with downstream practices. During wet
weather it may be necessary to wash truck tires at this location. A concrete washout is also
located adjacent to this area.
2. LAND GRADING
Practice 6.02
Grading should be limited to areas as shown on the plans. Cut and fill slopes shall be 3:1 or
flatter except where specifically indicated.
3. SEDIMENT FENCE
Practice 6.62
Sediment fencing should be installed as shown on the Plan, and around any temporary stockpile
areas as necessary to prevent any graded interior areas from eroding onto adjacent areas.
4. CONSTRUCTION ROAD STABILIZATION
Practice 6.80
Prior to commencement of excavation, hauling roads are to be temporarily stabilized by placing
sub-base course of approved stone to reduce erosion and dust. Water spraying will be utilized as
necessary to control dust.
5. TEMPORARY SEEDING
Practice 6.10
Any cleared or sparsely vegetative areas that cannot be brought to final grade within the
stabilization time frames shall be temporarily seeded as needed to help stabilize areas.
6. PERMANENT SEEDING
Practice 6.11
Permanent Seeding and/or sodding shall be conducted on areas where final grades have been
achieved as soon as practical and within the time frames listed on the plans.

CONSTRUCTION SCHEDULE-
Indicated on Plan
1. Obtain approval of Plan and any necessary permits and hold a pre-construction conference prior
to commencing any work.
2. Clearing, stumping, and construction of permanent access/haul road.
3. Clearing and stumping of access/haul road o Lake/excavation area and associated sediment
fencing downstream of access/haul road.
4. Install Gravel Construction Entrance.
5. Clearing and stumping of first 5 acres of Lake/excavation area for truck turn around and stockpile
location and association sediment fencing.
6. Initial excavation consisting of stripping and removal of topsoil in stockpile area(within Lake
Excavation area.)Construction of earthen berm/sound barrier. Creation of Vegetative buffer.
7. Stockpiling of 0.5 to 1.0 acres of material for creation of settling/dewatering/sediment basin. This
area will serve as a self-contained dewatering area/sediment basin and will have an earthen dam
separating it from future excavation. As the lake/excavation grows, the dam will be removed to
enlarge the settling/dewatering area/sediment basin to include recent completed excavated
areas.
8. As 2 to 3 acres of excavation have been completed in the manner mentioned above, lake banks
will be shaped, graded 5 to 1 slopes, mulched, seeded and landscaped as shown on the plans.
9. Once the lake is completed, temporary haul roads will be removed and reclaimed. Temporary
erosion control measures will be removed. Access road to site and earthen and vegetated buffers
will remain permanently.
MAINTENANCE PLAN -
Indicated on Plan

0
1. All measures to be inspected weekly and after any rainfall event and needed repairs made
immediately.
2. All seeded areas shall be fertilized, mulched, and re-seeded as necessary, according to
specifications provided, to maintain a suitable vegetative cover.
3. Sediment to be removed from behind silt-fence when it becomes Off deep. Fencing is to be
repaired as needed to maintain a barrier.
4. Construction entrance is to be maintained in a condition to prevent mud or sediment from leaving
the construction site. Periodic topdressing with 2"stone may be required. Remove all
objectionable material spilled, washed, or tracked onto public roadways immediately.
VEGETATIVE PLAN -
1. Permanent vegetation to be established in accordance with
"North Carolina Erosion and Sediment Control Planning and Design Manual", Section 6.11, latest
version. See Plan for specifications.