NCG020961_Supplemental Info_20201104

JISUNROCK�
CAROLINA SUNROCK LLC
Scott Martino
Manager Environmental Compliance
200 Horizon Drive, Suite 100
Raleigh, NC 27615
Certified: 7015 0640 0007 8087 6225
October 28, 2020
Ms. Annette Lucas, PE
Stormwater Program Supervisor
Division of Energy, Mineral, and Land Resources
512 N. Salisbury Street
Raleigh, NC 27604
RE: Carolina Sunrock LLC — Prospect Hill Quarry and Distribution Center
NCG020961
1238 Wrenn Road
Prospect Hill, Caswell County, North Carolina 27314
Dear Ms. Lucas:
RECEIVE®
NOV 0 4 2020
DENR-LAND QUALITY
STORMWATER PERMITTING
The purpose of this letter is to provide you and your department the additional information pertaining to
Carolina Sunrock LLC's application for coverage under General Permit NCG02000 as requested during
our meeting on October 23, 2020. We would like to thank you and your department for your time and
discussion of our proposed operational plans pertaining to process water usage/generation/flow, and the
overall anticipated water balance for the facility.
The main issue at the heart of our discussion on October 23, 2020 pertained to the USGS determination
that the 7Q10 ratings of the receiving water bodies is currently zero. Thus, no discharge of process water
is possible due to permit stipulations within the NCG02000. In light of this restriction, Carolina Sunrock
has chosen to re -design its pit dewatering methodology by adding additional water storage capacity
throughout the property in order to store, reuse, or evaporate all generated process water. The proposed
interlocking water retention system allows the proposed facility to move process water throughout the site
with the ability to allow all generated process water to ultimately return to the Pit A for storage.
This system was engineered based upon mean annual rainfall for the area, calculated groundwater
inflows from the hydrogeologic study, consideration of surface water runoff from stormwater divides into
the pits, known operational quarry water usage, and process water loss. In addition, large storm events,
such as the Q25, Q50, and Q100, were also incorporated into the water storage capacity calculations. All
calculations are based on maximum fully developed pits to depths of 150' and 300' below grade to
provide a conservative worst -case scenario for storage of process water. In reality, the potential water
storage needs during the actual development of either pit will be significantly less as each pit will be
mined in phases over many decades until the pits reach this maximum proposed design. (See Table 2)
These conservative calculations yielded the total proposed process water storage capacity of --39 million
gallons. In addition, each process water pond has been designed to provide at least two feet of free
board between the full capacity and the top of each structure's embankment. This free board will also
provide additional storage capacity during major storm events that may occur during the life of the mine
without overtopping the ponds in the event they are full prior to the event.
As demonstrated in the attached Table 2, the proposed process water pond storage capacity of --39
million gallons is greater than the anticipated water inputs when accounting for process water loss for the
ultimate completion of Pit A including the additional free board storage of a potential occurrence of a 100-
year storm event during the life of the Pit A. Thus, we believe we have provided a comprehensive
analysis that shows that our proposed storage pond system will ensure no process water discharge.
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JISUNROCK�
CAROLINA SUNROCK LLC
It is Carolina Sunrock's intent to fully mine Pit A prior to development in Pit B. Thus, Pit A will provide
additional process water storage capacity of —1.5 billion gallons until Pit A reaches groundwater table
equilibrium and then an additional —324 million gallons after it reaches equilibrium (using its freeboard
storage capacity). All calculated inflow to Pit B is to be pumped to Pit A where it will then be
pumped/distributed as needed across the facility within the closed loop water storage system for process
use. As demonstrated within Table 2, the proposed process water pond storage capacity along with the
storage capacity of Pit A will allow for the storage of all process water during the ultimate completion of
Pit B, including the potential occurrence of a 100-year storm event during the life of Pit B.
In summary, the proposed process water storage pond designs and water handling methodology along
with the phased mine sequence are adequate to provide a zero -process water discharge solution for the
facility. Thank you for the opportunity to address your comments and to supplement our existing NCG02
application currently under review. Please feel free to contact me if you or your department have any
further questions or need clarification.
Thank you for your assistance.
Sincerely,
Carolina Sunrock, LLC
Scott Martino
Manager Environmental Compliance
Enclosure
Signed Notice of Intent — General Permit Application
Table 1 (Updated Stormwater and Process Water Discharge Outfall and Feature Summary (Stormwater
Only))
Water Balance Power Point
Table 2 Water Balance Calculation Summary
Page 2 of 2

Attachment A
Signed Notice of
Intent - General
Permit Application

Division of Energy, Mineral and Land Resources /
Land Quality Section — Stormwater Permitting Program
National Pollutant Discharge Elimination System
Environmental
Quality NCG020000
NOTICE OF INTENT — General Permit Application
FOR AGENCY USE ONLY
Date Received
Year Month Day
Certificate of Coverage
N
Check # Amount
Permit Assigned to
National Pollutant Discharge Elimination System application for coverage under General Permit
NCG020000:
STORMWATER AND/OR WASTEWATER DISCHARGES associated with activities classified as:
SIC (Standard Industrial Classification) Code - 14XX Mineral Mining Industry (except as specified below) and
like activities
The following activities are included:
• Active or inactive mining operations (including borrow pits —except for NCDOT borrow pits) that discharge
stormwater contaminated with or that has come in contact with, any overburden, raw material, intermediate
products, finished products, byproducts or waste products located on the site of such operations;
• Stormwater from vehicle maintenance activities (VMA) at mining operations;
• Overflow from facilities that recycle process wastewater; and/or
• Mine dewatering (wastewater)
The following activities are specifically excluded from coverage under this General Permit:
• Stormwater discharges associated with peat mining, coal mining, and metal mining;
• Stormwater discharges from mining operations which are intermixed on site with stormwater from concrete
operations;
• Stormwater discharges associated with oil and gas extraction operations; and
• Stormwater discharges associated with tourist gem mines
• NCDOT borrow pits (covered under individual permit NCS000150)
The following discharges are covered by NPDES general permit NCG520000 instead of NCG020000:
Point source discharges of stormwater and wastewater from in -stream sand mining operations (sand dredging
or dipping operations) are covered instead by NPDES General Permit NCG520000, administered by the Division
of Water Resources NPDES Wastewater Permitting Program. Please contact DWR for more information.
Please print or type all entries in this application form.
1) Mailing address of owner/operator (official address to which all permit correspondence will be mailed):
Legal Owner Name Carolina Sunrock LLC
(Attach the most recent Annual Report to the NC Secretary of State showing the current legal name of the corporation or entity.
Alternatively this permit can be given to an individual or government authority. This name must be the same name as appears on the
Division of Energy, Mineral, and Land Resources' Mining Permit.)
Signee's Name (as signed for in question 41. at end) Gregg Bowler
Street Address 200 Horizon Drive, Suite 100
City
Telephone No.
Raleigh
919 747-6400
Alternate Contact Name" Scott Martino
State NC ZIP Code 27615
E-mail [e-mail]
E-mail (if different) [e-mail]
Alternate Contact Telephone (if different) 984 202-4761
'Alternate contact should be affiliated with the Owner/Operator. Consultant information can be provided
in question 5.
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2) Location of facility producing discharge:
Facility Name Carolina Sunrock LLC - Prospect Hill Quarry and Distribution Center
Facility Street Address 1238 Wrenn Road
Facility City Prospect Hill State NC ZIP Code 27314
Facility County Caswell County
Facility Contact Scott Martino
Telephone No. 984 202-4761 Fax:
Contact E-mail [e-mail]
3) Physical Location Information:
Please provide a narrative description of how to get to the facility (use street names, state road numbers, and
distance and direction from a roadway intersection). From 1-40: Take exit 160 (Mt Willing Rd), right onto Mt Willing Rd (0.4 mi), left
onto Forrest Ave (0.2 mi), continue straight to S Efland-Cedar Grove Rd (9.8 mi), left onto NC-86N (3.9 mi), right onto Ridgeville Rd (2.3 mi), right onto Wrenn Road
4) Facility Location Coordinates:
Latitude 36.300542 N Longitude -79.167336
degrees)
5) Consultant Information (if applicable):
Consultant: Jonathan Murphrey
Consulting Firm: Piedmont Geologic
Mailing Address: 6003 Chapel Hill Road, Suite 145
City: Raleigh
State: NC Zip Code: 27607
Phone: (919 ) 854-9700 Fax: ( )
E-mail: [e-mail]
W (degrees / minutes / seconds or decimal
Permits:
6) This NPDES Permit Application applies to which of the following:
P New or Proposed Facility Date operation is to begin: 2020
❑ Existing Date began mining:
7) Standard Industrial Classification:
(Optional)
Staple Business Card Here
Provide the 4 digit Standard Industrial Classification Code (SIC Code) that describes the primary industrial
activity at this facility SIC Code: 1 4 2 9
8) Provide a description of the types of minerals mined at this facility: Aggregates (diabase, diorite, granodiorite;
9) Is this a PROCESSING -ONLY facility for materials mined elsewhere? No ❑ Yes
10) Is this an inactive mine site?
IN No
❑ Yes If yes, have you certified to the Stormwater Permitting Program that all portions of the site where
clearing, grading, and/or excavation activities have occurred have been stabilized?
❑ No ❑ Yes (If yes, the site may be eligible for "Dormant Status" and reduced BMP
inspections. See the General Permit.)
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11) Does this facility already have a valid Mining Permit from DEMLR's Land Quality Section?
4 No If no, please indicate the status of the Mining Permit application:
❑ Yes If yes, please provide the Mining Permit number:
the DEMLR Mining Permit with this NPDES application.
12) Does this facility have any other NPDES permits?
Pseso,g re -submittal of mWiti—I information request an0 DEMLR review
Also provide a copy of
11 No
❑ Yes If yes, list the permit numbers for all current NPDES permits for this facility:
13) Are you applying for a discharge permit in the same location as a previously permitted mine?
11 No
❑ Yes If yes, specify permit number and mine name if known:
14) Does this facility have any Non -Discharge permits from DWR (e.g., recycle permits)?
11 No
❑ Yes If yes, list the permit numbers for all current Non -Discharge permits for this facility:
15) Does total area of this mine site include ready -mixed concrete plant and/or asphalt plant areas?
❑ No
✓❑ Yes If yes, do they have separate NPDES stormwater permits? IN No ❑ Yes (provide permit
number(s) Facility Proposed )
If not owned by the same company, who is the owner?
Development Activities and Buffers:
16) Will this mining operation precede development activities at this site?
N No
❑ Yes
17) Is this mine located within one of the 20 Coastal Counties, and will it add more than 10,000 ft2 of
impervious surface?
❑ Yes (to both)
❑ No, this mine site IS in one of the 20 Coastal Counties but will NOT add 10,000 ft2 of impervious surface.
4 No, this mine site is NOT in any of the 20 Coastal Counties.
If this site is in one of the 20 Coastal Counties, you may be required to apply for an additional State
Stormwater Permit. Check with your local Regional Office (see contact information and checklist below).
18) Is this mine located the Neuse, Tar -Pamlico, or Catawba River Basins, or the Randleman or Jordan
Water supply Watersheds?
P No
❑ Yes If yes, what size stream buffers are included on site? ft. You must show buffers on site
plans. Also include information and plans showing diffuse flow through buffers as required.
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Discharge Points, Receiving Waters & Wetlands:
19) Receiving waters:
What is the name of the body or bodies of water (creek, stream, river, lake, etc.) that the facility stormwater
and/or wastewater discharges will end up in? ')Unnamed stream in central portion of site ----> South Hyco Creek (Lake Roxboro);
2) Unnamed stream in western portion of site ----> South Hyco Creek (Lake Roxboro); 3) Sugartree Creek in eastern portion of site ----> South Hyco Creek (Lake Roxboro);
To find the waterbody, please see the NC Surface Waterbody Classifications map at
https://deq.nc.gov/about/divisions/water-resources/water-resources-science-data
Receiving water classification(s) for the waters
WS-II, B; HQW
If the site will discharge to a separate storm sewer system, name the operator of the separate storm sewer
system (e.g. City of Raleigh municipal storm sewer).
Discharge of wastewater to receiving waters classified as WS-II through WS-V, or SA, must be
approved by the Division of Water Resources (DWR) or Division of Marine Fisheries
(DMF). DEMLR cannot grant coverage under NCG020000 without that approval. Also be advised that
no new discharges of wastewater are permitted in receiving waters classified as WS-1 or
freshwater ORW. Wastewater discharges to saltwater ORW will not be approved under General Permit
NCG02 but may be eligible for an individual permit.
20) Will this mine site discharge wastewater or stormwater to waters classified as High Quality Waters
(HQW), Primary Nursery Areas (PNA), Trout (Tr) waters, or a class with a symbol like "+" or "@" that
denotes a special management strategy is in place?
❑ No
❑ Yes, PNA*
11 Yes, HQW*
❑ Yes, Trout jr)
❑ Yes, includes "+" or "@"
21) Will this mine site discharge wastewater or stormwater to waters classified as Shellfish (SA) waters?
P No
❑ Yes, SA*
*For questions 19-20, be advised that the NCG02 General Permit limits the discharge volume of total combined
wastewaters to 50 percent of the receiving water in -stream flow under 7Q10 conditions in HQW waters (PNA and
SA waters are considered HQW by definition). You maybe required to contact USGS to obtain a 7Q10 flow.
22) Will this mine site discharge wastewater or stormwater to impaired waters, or to waters with an
approved "Total Maximum Daily Load" (TMDL)?
To find impaired waters & TMDLs, please see the Impaired Waters Map & TMDL map on
https://deq.nc.gov/abouVdivisions/water-resources/water-resources-science-data
❑ No
11 Yes, these waters are impaired for (list pollutants): Chlorophyll
❑ Yes, these waters have a TMDL for (list pollutants):
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23) List discharge points (outfalls) that convey discharge from the mine site (both on -site and off -site) and
location coordinates. Attach additional sheets if necessary, or note that this information is specified
on the site plan. Include proposed maximum daily flow rate for each wastewater outfall.
You must show all discharge points clearly on the submitted site plan. Be advised
that NCDEQ may require you to apply for an individual permit, based on proposed
discharge rates and receiving stream conditions (low flows, impairments, etc.)
Stormwater
***See Attachment A - Table 1 for all outfalls***
Stormwater Outfall No.
Latitude (degrees/minutes/seconds or decimal degrees): N
Longitude (degrees/minutes/seconds or decimal degrees): W
Stormwater Outfall No.
Latitude (degrees/minutes/seconds or decimal degrees):
N
Longitude (degrees/minutes/seconds or decimal degrees):
W
Stormwater Outfall No.
Latitude (degrees/minutes/seconds or decimal degrees):
N
Longitude (degrees/minutes/seconds or decimal degrees):
W
Stormwater Outfall No.
Latitude (degrees/minutes/seconds or decimal degrees):
N
Longitude (degrees/minutes/seconds or decimal degrees):
W
Stormwater Outfal/ No.
Latitude (degrees/minutes/seconds or decimal degrees):
N
Longitude (degrees/minutes/seconds or decimal degrees):
W
Stormwater Outfall No.
Latitude (degrees/minutes/seconds or decimal degrees):
N
Longitude (degrees/minutes/seconds or decimal degrees):
W
Mine Dewatering
Mine Dewatering (Wastewater) Outfall No.
Proposed maximum flow rate:
Latitude (degrees/minutes/seconds or decimal degrees):
N
Longitude (degrees/minutes/seconds or decimal degrees):
W
Mine Dewatering (Wastewater) Outfall No.
Proposed maximum flow rate:
Latitude (degrees/minutes/seconds or decimal degrees):
N
Longitude (degrees/minutes/seconds or decimal degrees):
W
Process Wastewater
Process Wastewater Outfall No. Wastewater Description:
Proposed maximum flow rate:
Latitude (degrees/minutes/seconds or decimal degrees): N
Longitude (degrees/minutes/seconds or decimal degrees): W
Process Wastewater Outfall No. Wastewater Description:
Proposed maximum flow rate:
Latitude (degrees/minutes/seconds or decimal degrees): N
Longitude (degrees/minutes/seconds or decimal degrees): W
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24) Help us understand what will happen to the dewatering water at this mine site:
❑ N/A — this mine is not dewatering at all and will not dewater in the future.
a) Will this mine be dewatering and discharging to waters of the state? (Answer only if dewatering)
4 No
❑ Yes If yes, where to? ❑ Surface Waters and/or Wetlands (on -site or off -site)
❑ Other (on -site or off -site) Describe:
b) Will this mine be dewatering but not discharging to waters of the state? (Answer only if dewatering)
❑ No
9 Yes If yes, explain how you are dewatering, and where that water will be directed: Revised operation plan
allows for all process waters generated at the site (including mine dewatering) to be reused in the production processes (i.e., the processing plant
plant for aggregate washing and the concrete -production plant). See site process flow diagram in Attachment A.
25) Are there wetlands or surface waters within 400' of the mine pit perimeter?
❑ No
P Yes If yes, what distance are they from the mine pit perimeter? varies; see site plan. feet.
26) Will mining operations require dewatering near wetlands or other waterbodies, and will dewatering
potentially impact any wetlands or other waterbodies?
❑ No, dewatering will not occur near (within 400') of wetlands or other waterbodies (e.g., streams, lake, etc.)
4 Yes, dewatering will be near wetlands or other waterbodies
Wetlands must be CLEARLY DELINEATED on the site plan. Mine dewatering activities that
have the potential to drain wetlands or otherwise impact surface water or groundwater MUST develop and
implement a Pumping Operation and Monitoring (POM) Plan that has been approved by the
Department.
For sites that may drain wetlands — approval of a POM Plan may be required prior to coverage under
this permit. The POM Plan should be submitted to the appropriate Regional Office and in all cases must be
approved prior to operation.
The plan shall include, but is not limited to: (1) Groundwater monitoring strategies to demonstrate the effect of
pumping and to establish any pumping regime necessary to reduce impacts, and (2) Detailed plans to maintain
surrounding hydrology and respective monitoring to demonstrate compliance. See checklist at the end of the
application. Contact the Regional Office for questions specific to your mine.
27) Have you been required to obtain 404/401 Certification permits?
P No
❑ Yes If yes, please briefly describe below (include information such a required mitigation, BMPs,
setbacks, and/or O&M plans for on or off -site wetlands or other pertinent information). Attach other sheets as
necessary:
404/401 permits are not required for the proposed activities as there are no direct impacts to streams or welands (see the attached plans for, buffers, S&E controls,
and pump and monitoring plan.
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28) Have you been required to obtain a wetland delineation certified by the US Army Corps of Engineers?
❑ No M Yes If yes, please attach to application submission.
Stormwater BMPs and Vehicle Maintenance:
29) Does this facility employ best management practices for stormwater control?
❑ No M Yes
If yes, please briefly describe: Structural BMPs include vegetative swales plus secondary
containment structures for bulk liquids. Non-structural BMPs include employee training for stormwater pollution prevention and safe
equipment/materials handling practices, and spill prevention and response.
30) Does this facility have a Stormwater Pollution Prevention Plan?
❑ No Yes If yes, when was it implemented? SPPP will be implemented upon initiation of mining activities.
31) Are vehicle maintenance activities (VMA) occurring or planned at this mine site?
❑ No @Yes, If yes, will VMA area runoff discharge into the wastewater treatment system(s)?
M No, VMA runoff will discharge separately through a stormwater outfall
❑ Yes, VMA runoff will drain back to the mine pit or other wastewater system
Wastewater Treatment Facilities:
32) Will mine dewatering occur? (Yes, we are asking about dewatering again.)
❑ No
F Yes If yes, will the mine discharge this water? No; will be recycled via closed -loop system
33) Will this facility wash mined materials?
❑ No
!� Yes If yes, will the mine discharge this water? No; will be recycled via closed -loop system
34) Will discharges of process wastewater treatment systems occur (including possible recycle system
overflows)?
M No
❑ Yes If yes, describe what kind of systems: NO; the closed -loop system will ultimately release
back to the Open Pit prior to overflows occurring via pumpina and or gravity flow automatech
systems (see Attachment A. Fiaure 3).
35) Will this facility employ chemical additives to flocculate suspended solids?
M No
❑ Yes If yes, provide the name, manufacturer, and the quantity of average daily usage of the chemical
additive (if known):
Note: Please see our website for a list of evaluated polyacrylamide (PAMS) products for use in North Carolina:
https://deq. nc.gov/abouVdivisions/energy-mineral-land-resources/energy-mineral-land-permits/stormwater-permits/
construction-sw
36) Will any of the wastewater treatment facilities at this mine overflow only during rainfall events that
exceed the 10-yr, 24-hr rainfall event?
M Yes If yes, which treatment systems are those? All Wastewater treatment will
not overflow durina a 10vr-24-hr. and desianed to contain 100-vear stormevent due to
additional freeboard
❑ No, all wastewater treatment facilities will discharge more frequently (i.e., during smaller rain events)
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37) Are wastewater treatment facilities (including recycle systems) planned in the 100-year flood plain?
P No
❑ Yes
j( 38) A wastewater treatment alternatives review is required by 15A NCAC 2H.0105 (c)(2)
for any new or expanding water pollution control facility discharges in North Carolina. You may
attach additional sheets. List the types of wastewater this mine site will discharge:
Mine Dewatering
Process Wastewater (such as washing or recycle system overflows, other mining activity wastewater)
a) What wastewaters were considered for this alternatives review? P Dewatering P Process WW
b) Connection to a Municipal or Regional Sewer Collection System:
i) Are there existing sewer lines within a one -mile radius? ..................................... ❑ Yes ❑✓ No
(1) If Yes, will the wastewater treatment plant (WWTP) accept the wastewater? .... ❑ Yes ❑ No
(a) If No, please attach a letter documenting that the WWTP will not accept the wastewater.
(b) If Yes, is it feasible to connect to the WWTP? Why or why not?*
c) Closed -loop Recycle System (meets design requirements of 15A NCAC 2T .1000):
i) Are you already proposing a closed -loop recycle system (CLRS)? ......................... P Yes ❑ No
(1) If Yes, for what type of wastewater at this mine site? N Dewatering P Process WW
(2) If No, is this option technologically feasible (possible)? Why or why not?*
(3) If No, is it otherwise feasible to build a CLRS at this site? Why or why not?*
(4) What is the feasibility of building a CLRS compared to direct surface water discharge?*
d) Surface or Subsurface Disposal System (e.g., spray irrigation):
i) Is a surface or subsurface disposal technologically feasible (possible)? ..................... ❑ Yes 4 No
Why or Why not? * Surface/subsurface disposal on -site would hinder the ability to dewater the pits, rendering this technologically infeasible.
ii) Is a surface or subsurface disposal system otherwise feasible to implement?*............ ❑ Yes P No
Why or Why not?* See above.
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iii) What is the feasibility of employing a subsurface or surface discharge as compared to a direct
discharge to surface waters?* Not feasible (see above).
e) Direct Discharge to Surface Waters: Is discharge to surface waters the most environmentally sound
alternative of all reasonably cost-effective options for the wastewaters being considered?*
M Yes ❑ No
f) If this review included all wastewater discharge types, would excluding some types (e.g. mine
dewatering) make any of the above non -discharge options feasible for some of the wastewaters?
❑ Yes 11 No
* Feasibility should take into account initial and recurring costs. You may be asked to provide
further information to support your answers to these questions after the initial review.
Other:
39) Hazardous Waste:
a) Is this facility a Hazardous Waste Treatment, Storage, or Disposal Facility?
0 No ❑ Yes
b) Is this facility a Small Quantity Generator (less than 1000 kg. of hazardous waste generated per month) of
hazardous waste?
M No ❑ Yes
c) Is this facility a Large Quantity Generator (1000 kg. or more of hazardous waste generated per month) of
hazardous waste?
91 No ❑ Yes
d) If you answered yes to questions b. or c., please provide the following information:
Type(s) of waste:
How is material stored:
Where is material stored:
How many disposal shipments per year:
Name of transport / disposal vendor:
Vendor address:
40) Is your facility providing appropriate secondary containment for bulk storage of liquid materials? (See
permit text for secondary containment requirements.)
❑ No
M Yes
41) Does your site have an active landfill within the mining permit boundary?
M No
❑ Yes If yes, specify type: ❑ LCID (Land Clearing and Inert Debris) ❑ Other:
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Final Checklist:
This application will be returned as incomplete unless all of the following items have been included and
1 — initialed for. Please show that the following required information has been included by initialing in each
space below.
sM Fee of $100 made payable to NCDEQ.
sM Completed application and all supporting documents.
sM Copy of the valid approved mining permit (MP) for the facility or indication of MP application status.
sM Copy of a county map or other general location map that shows the mining site and nearest major roads.< --- (Attachment
sM Copy of USGS topographic map showing the mining site and surrounding areas, or other map that clearly
shows site location in relation to nearby streams, wetlands, and other waters, etc. <--- (Attachment A)
sM 2 copies of large-scale (minimum 24" x 36") site plan with topographical lines with
all outfalls, applicable buffers and wetlands clearly delineated, receiving waters, and
100-year flood plain line if applicable. <--(AttachmentB)
N/A A copy of your US Army Corps -approved wetland delineation if you marked "yes" to question 27 above.
sM A line drawing of the water flow through the facility or block flow diagram. A pictorial description of the
nature of any sources of water and any collection and treatment measures. <--- (Attachment A)
N/A If mine site is in one of the 20 Coastal Counties:
• Applicant has checked with the appropriate regional office to verify the need for a Coastal State
Stormwater permit. Indicate the Regional Office Contact:
• Applicant has included a detailed list of impervious surface areas and percentages, sub -drainage
areas, and total drainage area.
sM If the mine is dewatering and near wetlands, or may otherwise impact surface waters or groundwater,
include the following and contact your local regional office about a Pumping Operation and
Monitoring (POM) Plan. An approved POM plan may be required prior to NCG02 issuance.
sM 2 copies of detailed Full Size Plans (at least 24" x 36") delineating areas on the
plans and listing acreage (including: wetlands, ditches, well -placements, pits,
borrow areas, overburden storage, stormwater controls/BMPs, vehicle
maintenance areas, settling basins, product process (such as screening,
stockpiles, waste piles), total drainage area, impervious surface percentages (if
state SW programs apply), applicable buffers, and access and/or haul roads).
sM Pump dewatering size and information on its specifications.
sM Well information (design, depths, maintenance).
sM Physical monitoring for the wetlands areas. <--- (Attachment C)
SM Settling pond sizing information, if applicable.
N/A Level spreader design, if applicable.
sM Details about dewatering method.
sM Cone of influence calculations.
-OR-
sM Description of measures to prevent erosion and flooding. <--- (Attachment D)
N/A Description and information about 401/404 permits that have been obtained.
sM Copy of US Army Corps of Engineers wetland delineations or approved wetland delineation (if
applicable). <--- (Attachment F)
sM I have contacted my local regional office about a POM Plan.
Regional Office Contact: sue Homwood . Date contacted: 07-31-2020
I will not impact any nearby wetlands, surface waters, or groundwaters by dewatering.
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SWU-NCG02-NOI Last revised 9/10/2015

NCG020000 N.O.I.
Certification: North Carolina General Statute 143-215.6 b (i) provides that:
Any person who knowingly makes any false statement, representation, or certification in any application, record, report, plan, or other
document filed or required to be maintained under this Article or a rule implementing this Article; or who knowingly makes a false
statement of a material fact in a rulemaking proceeding or contested case under this Article; or who falsifies, tampers with, or knowingly
renders inaccurate any recording or monitoring device or method required to be operated or maintained under this Article or rules of the
[Environmental Management] Commission implementing this Article shall be guilty of a Class 2 misdemeanor which may include a fine not to
exceed ten thousand dollars ($10,000).
41) Signatory Requirements (per 40 CFR 122.22)
All applications, reports, or information submitted to the Director shall be signed and certified.
a. All notices of intent to be covered under this General Permit shall be signed as follows:
(1) For a corporation: by a responsible corporate officer. For the purpose of this permit, a responsible corporate officer means: (a) a president,
secretary, treasurer or vice president of the corporation in charge of a principal business function, or any other person who performs similar
policy or decision making functions for the corporation, or (b) the manager of one or more manufacturing production or operating facilities
employing more than 250 persons or having gross annual sales or expenditures exceeding 25 million (in second quarter 1980 dollars), if
authority to sign documents has been assigned or delegated to the manager in accordance with corporate procedures.
(2) For a partnership or sole proprietorship: by a general partner or the proprietor, respectively; or
(3) For a municipality, state, federal, or other public agency: by either a principal executive officer or ranking elected official.
I hereby request coverage under the referenced General Permit. I understand that coverage under this permit will
constitute the permit requirements for the discharge(s) and is enforceable in the same manner as an individual
permit.
I agree to abide by the following as a part of coverage under this General Permit:
1. I agree to abide by the approved Mining Permit for this mining activity. (A copy of the valid mining
permit must be attached to this request.)
2. 1 agree to not discharge any sanitary wastewater from this mining activity except under the
provisions of another NPDES permit specifically issued therefore.
3. 1 agree that bulk storage of petroleum products and other chemicals shall have adequate protection
so as to contain all spills on the site.
4. 1 agree that solid wastes will be disposed of in accordance with N.C. statutes and rules governing
solid waste disposal.
5. 1 agree that maintenance activities for vehicles and heavy equipment will be performed so as to not
result in contamination of the surface or ground waters.
I agree to abide by the provisions as listed above and recognize that the provisions are to be considered as
enforceable requirements of the General Permit.
I certify that I am familiar with the information contained in this application and that to the best of my knowledge
and belief such information is true, complete, and accurate.
Printed Name of Person Signing:Gregg Bowler
Title: President
of Applicant)
(Date Signed)
Notice of Intent must be accompanied by a check or money order for $100.00 made payable to NCDEQ.
Page 11 of 12
SWU-NCG02-NOI Last revised 9/10/2015

NCG020000 N.O.I.
Mail the entire package to:
DEMLR - Stormwater Program
Dept. of Environmental Quality
1612 Mail Service Center
Raleigh, North Carolina 27699-1612
Note
The submission of this document does not guarantee coverage under the NPDES
NCG02 General Permit. Upon review of the submittal, the Division may
determine that coverage under an individual permit is more appropriate. Also be
advised that renewed and continued coverage under NCG02 may be dependent
upon the permittee's compliance success and/or status of the receiving waters.
For questions, please contact the DEMLR/Land Quality Section Regional Office for your area.
DEMLR/Land Quality Section Regional Office Contact Information:
Asheville Office ......
[phone]
Fayetteville Office
... [phone]
Mooresville Office
... [phone]
Raleigh Office ........
[phone]
Washington Office
...[phone]
Wilmington Office ...
[phone]
Winston-Salem ......
[phone]
Central Office .........(919)
707-9220
Page 12 of 12
SWU-NCG02-NOI Last revised 9/10/2015

Attachment B
Misc. Figures/
Tables
Figure 1 — Site Location Map (USGS Topo)
Figure 2 — Site Location Map (Major Roads)
Figure 3 — Proposed Wastewater Process -Flow Diagram
Table 1 - Stormwater and Process Wastewater Discharge Outfall Summary

Site Location
,771
Prospect Hill
, 50C
FIGURE 2
PIEDMONT
0 1000 2000 3000 4000 5000 ft SITE LOCATION MAP
(MAJOR ROADS)
GEOLOGIC Carolina Sunrock
Data Source: Google Maps (retrieved 12/5/19). Caswell County Property
SMART EARTH SOLUTIONS Prospect Hill, North Carolina 27314

IQuarry Pit — Dewatering of
Groundwater/Stormwater
Pump/Pipe
Diverter Valve
Aggregate
Processing
Facility
Gravity
Flow Pipe
Plant Make-up Gravity
Pond-B Spillway
Pump/Pipe
Settling Basins -
Solids reclaimed back into
production process, or disposed in
permitted overburden/pond fine
disposal areas
Plant Make-up
Pond-C
Pump/Pipe
Excess Water
Mixer Truck Washouts
Concrete Production
Plant
Process Water from
f
Gravity
Flow Pipe
Weir/filtration system to
remove solids/ Solids
recycled back into the
production process
Pump/Pipe
pH neutralization
system (CO2)
Note: All other process wastewater generated at the facility
(including commingled stormwater/wastewater) shall be
diverted/pumped to above -listed process wastewater
facilities and reused in the production process.
Figure 3
Proposed Wastewater
Process -Flow Diagram

Table 1 - Stormwater and Process Wastewater Discharge Outfall and Feature Summary
Carolina Sunrock - Caswell County Site
Wrenn Road, Prospect Hill, North Carolina
Outfall/Feature Name
Discharge Type
Latitude
Longitude
Plant Water Pond - 1
Closed loop, no discharge - Process water (overflows to pit)
36018' 18.0711"
-79° 10'01.7953"
Plant Makeup -pond A
Closed loop, no discharge - Process Water -
Groundwater/stormwater from pit overflows to pit)
36018'17.0316"
-79009'56.0672"
Plant Makeup -pond B
Closed loop, no discharge - Process Water -
Groundwater/stormwater from it overflows topit)36°
17 53.2720„
-79° ,1040.8267 „
Plant Makeup -pond C
Closed loop, no discharge - Process Water -
Groundwater/stormwater from pit overflows to it
36017'55.6535"
-079010'36.6550"
Basin 1
Stormwater
36017'48.6193"
-79010'39.4691"
Basin 2
Stormwater
36017'57.6302"
-79010'33.2042"
Basin 3
Stormwater
36017'58.5370"
-79010'28.2116"
Basin 4
Stormwater
36018'01.5366"
-79010'30.4476"
Basin 5
Stormwater
36018'01.3801"
-79010'35.2031"
Basin 6
Stormwater
36018'03.9985"
-79010'34.9504"
Basin 7
Stormwater
36018'04.5294"
-79010'30.8191"
Basin 8
Stormwater
36018' 11.4086"
-79010'34.6494"
Basin 9
Stormwater
36018'09.7350"
-79010'27.0218"
Basin 10
Stormwater
36018' 15.1504"
-79010' 16.7962"
Basin 11
Stormwater
36018' 16.0181"
-79010' 10.8094"
Basin 12
Stormwater
36018'06.3932"
-79010'20.0600"
Basin 14
Stormwater
36018'09.3420"
-79010'10.3636"
Basin 15
Stormwater
36018'05.3239"
-79010'07.3254"
Basin 16
Stormwater
36018' 12.4415"
-79010'06.6262"
Basin 17
Stormwater
36018'19.1434"
-79009'59.1363"
Basin 18
Stormwater
36018'18.2779"
-79009'50.7860"
Basin 19
Stormwater
36018'12.1830"
-79009'54.3411"
Basin 20
Stormwater
36018' 18.2318"
-79009'45.0895"
Basin 21
Stormwater
36018'10.9435"
-79009'47.4576"
Basin 22
Stormwater
36018'11.4780"
-79009'45.1852"
Basin 23
Stormwater
36018'17.6611"
-79009'41.6542"
Basin 24
Stormwater
36018'13.2966"
-79009'39.3306"
Basin 25
Stormwater
36018'13.6670"
-79009'29.7610"
Basin 26
Stormwater
36018'12.4619"
-79009'32.6468"
Basin 27
Stormwater
36018'09.4499"
-79009'28.8550"
Basin 28
Stormwater
36018'03.6168"
-79009'35.1549"
Basin 29
Stormwater
36018'00.0531"
-79009'39.1961"
Basin 30
Stormwater
36018'05.7805"
-79009'47.5007"
Basin 31
Stormwater
36018'00.3771"
-79009'46.9779"
Basin 32
Stormwater
36017'54.7934"
-79009'41.5576"
Basin 33
Stormwater
36017'50.6704"
-79009'45.9624"
Basin 34
Stormwater
36017'49.5901"
-79009'39.8819"
Basin 35
Stormwater
36017'54.9291"
-79009'35.1594"
Basin 36
Stormwater
36017'57.1978"
-79009'33.1538"
Basin 37
Stormwater
36018'02.7412"
-79009'29.9381"
Basin 38
Stormwater
36018'05.8896"
1 -79009'27.6658"
(continued)

Table 1 (continued) - Stormwater and Process Wastewater Discharge Outfall and Feature Summary
Carolina Sunrock - Caswell County Site
Wrenn Road, Prospect Hill, North Carolina
Outfall/Feature Name
Discharge Type
Latitude
Longitude
Basin 39
Stormwater
36018' 11.7152"
-79009'25.1625"
Basin 40
Stormwater
36017'53.7572"
-79009'23.4920"
Basin 41
Stormwater
36017'47.8179"
-79009'27.2564"
Basin 42
Stormwater
36017'52.4954"
-79009'32.1195"
Basin 43
Stormwater
36017'50.5100"
-79009'33.9137"
Basin 44
Stormwater
36017'45.5996"
-79009'33.7586"
Basin 45
Stormwater
36017'45.4465"
-79009'29.5586"
Basin 46
Stormwater
36017'41.4250"
-79009'27.7791"
Basin 47
Stormwater
36017'39.6796"
-79009'32.9330"
Basin 48
Stormwater
36017'39.4196"
-79009'24.6552"
Basin 49
Stormwater
36017'34.5068"
-79009'30.4062"
Basin 50
Stormwater
36017'30.6134"
-79009'36.2552"
Basin 51
Stormwater
36017'33.1029"
-79009'22.5817"
Basin 52
Stormwater
36017'24.8014"
-79009'33.1731"
Basin 53
Stormwater
36017'20.2426"
-79009'32.5005"
Basin 54
Stormwater
36017'15.5027"
-79009'36.5129"
Basin 55
Stormwater
36017'24.0463"
-79009'42.7889"
Sediment trap 1
Stormwater
36018'12.1523"
-79010'23.3788"
Sediment trap la
Stormwater
36018'12.3927"
-79010'14.9395"
Sediment trap 2
Stormwater
36017'57.6238"
-79010'14.1465"
Sediment trap 3
Stormwater
36017'57.1947"
-79010'03.9566"
Sediment trap 4
Stormwater
36018' 10.8177"
-79010'00.6860"
Sediment trap 5
Stormwater
36018'05.9826"
-79009'33.5170"
Sediment trap 6
Stormwater
36018'01.5042"
-79009'21.7744"
Sediment trap 7
Stormwater
36017'26.4596"
-79009'24.4001"
Sediment trap 8
Stormwater
36017'58.8859"
-079010'47.2256"

Attachment C
Water Balence
Power Point

JISUNROCK a
!- r1q,
n r
, �! , ..mlf
7ire<
PROSPECT HILL
QUARRY WATER
BALANCE
10-21-2020

Prospect Hill Quarry Process
Water
o Zero Discharge
■ Why?
■ High Quality Water Shed
NCG02000 Requires
It
All process water discharge rates (cfs (cubic feet per second) must be
50% below the 7Q 10 of the receiving water body.
Definition of 7Q 10
The 7Q 10 is the lowest 7-day average flow that occurs (on average)
once every 10 years.
The 7Q10 for all surrounding water bodies is Zero (Determined by
USGS (July 2020)
Thus No Discharge of process water is possible

Typical Quarry Dewatering
S stem Sunrock Kittrell Quarry)
13 Kittrell Quarry
—22 years old
_.i
Plant�■ —45-acers
` '� ■ 150' maximum pit
depth (sump B)
.� j,. ',. :. ■ Average annual
production
(~500k-1 million
tons/yr.)
Plant Water Pond
,,
Settling ,
Plant Make-up Water/Dewatering Pond
_ T
n
V

Typical Quarry Dewatering
System i Sunrock Butner Quarr
13 Butner Quarry4�14
■ -y50 years old �■ 100 Acres■ 250' maximum pitdepth (sump B)
■ Average annual j• x
production (-v 1-3
million tons/yr.)
De -watering Pond
Sump AV
V/
P5;
` :V ,
4C
r
It

Prospect Hill Quarry Process
Water Flow Diagram
It
Quarry Pit Dewatering
Groundwater/Stormwater
Inflow (Pit A)
Concrete Plant
Production
Pump/Pipe
Pump/Pipe
Plant Make-up
Process Water from
Diverter Valve
Pond- A
Mixer Truck washout
Gravity
Gravity
Flow
Flow
Pipe
Pump/Pipe
Weir/filtration system
to remove solids/
Plant Water Pond
Plant Make-up Solids recycled back
Pump/Pipe
Pond- B into the production
Excess Water
process
Pump/Pipe
Gravity
Flow
Pump/Pipe
Pipe
Pump/Pipe
Aggregate
Excess
Processing
Settling Basins
Water pH neutralization
Facility
Solids reclaimed back into
system (CO2)
production process, or disposed
in permitted overburden/pond
Gravity
fine disposal areas
Flow
Pipe
Plant Make-up
Plant Make-up
All other process water developed at the facility shall
Pond- B c`° "Y
sP"w°Y
Pond- C
be diverted/pump to above listed process water
Pump/Pipe
facilities and reused in the production process
* Pit B — Dewatering system to be pumped and
contained within Pit A (upon Pit Ns Completion)

Prospect Hill
Water Ponds
a Wed12 P, Temp Basin #17
`Sheet C3 03
CO
Plant Water Pond
-1Acre -
1,447,000 gal
Capacity
193,378 Cull
storage caps*
Sheet 7D
wAn i6xeox r
Sediment Trap A
' Sheet C3.11
24'
Quarry
Plant Process
Water Settling
Ponds
-3 Acres -
705,488 gal
Capacity
94,310.08 curt
Storage Capacity
Sheet 7D
Pt A
Temp Basir
Sheet C3 Oa
Plant Make -gyp Water Pond -A
-2-Acre - 2,574,947 gal Capacity
344,220 Cult Storage Capacity
Sheet 7G
ft
` r Tarp BoOn 91
t3heat C3.04
`If
l 1
1
Process It
■ Plant Water Pond/Plant Make-up
Water Pond A
■ Fed directly from Pit Dewatering
■ Interconnected gravity flow
■ Plant Water Pond Pumps to
Processing Plant and
Miscellaneous uses (i.e. plant dust
suppression)
■ Pump lines equipped with
diverters to allow for discharge
directly back to Pit A as needed.
■ Plant Process Water Settling Ponds
■ Series of (8) eight individual
ponds
Fed via gravity directly from
Aggregate Wash Screens
■ Discharge via gravity flow
directly back to Plant Water
■ Complete Closed loop System

Prospect Hill Quarry Process
Water Ponds
r
�c
I
■ Plant Make-up
B/C
It
Water Pond
Fed directly from Pit
Dewatering Pit A
Also fed from excess process
water from concrete plant
systems (truck wash out weir)
via pump
■ Interconnected gravity Spill
way to Plant Make-up Water
Pond C
■ Both Ponds equipped with
pumps supplying Concrete and
Asphalt facility's with water for
their process
Pumps also equipped to
discharge back to either Pit A
and or Plant Water Pond/Plant
Make-up Water Pond A as
needed
Complete Closed loop System

0
Prospect Hill Quarry Process
Water Storage
o Quarry Water Usage
Water Usage
It
Gallons/Day
Gallons/Month Gallons/Year
% Process Loss Gallons Loss/Day
Gallons
Loss/Month
Gallons
Loss/Year
Aggregates Process facility 2,100,000
54,600,000 655,200,000
20%
420,000
10,920,000
131,040,000
Dust Suppression 9,000
234,000 2,808,000
100%
9,000
234,000
2,808,000
misc. 6,000
156,000 1,872,000
100%
6,000
156,000
1,872,000
Totals 2,115,000
54,990,000 659,880,000
-
435,000
11,310,000
135,720,000
■ Aggregate Process facility wash
screen
water use
is 3500gpm
Two wash screens proposed only one screen used in calculations
■ Aggregate facility limited to operating 6-days a week 10-hours
per day for calculation purposes only
■ Typical Aggregate Process Facility —20% water loss
Water lost via evaporation, saturation of finished products, saturation of
generated fines (pond fines or waste materials)

Prospect Hill Quarry Process
Water Storage
13 Pit Dewater In flows
Water Inputs
Stormwater Drainage Acres
Groundwater Inflow Pit A 150'
- -
Groundwater Inflow Pit A 300'
- -
Groundwater Inflow Pit B 150'
- -
Groundwater Inflow Pit B 300'
- -
Mean Annual Rainfall PIT A**
2,102,447 48
Mean Annual Rainfall PIT B ***
3,746,160 86
Totals
5,848,607
It
ft./day Gallons/day Gallons/Month Gallons/Year
- 134,702
4,097,186
49,166,230
- 237,160
7,213,617
86,563,400
- 114,169
3,472,640
41,671,685
- 302,690
9,206,821
110,481,850
0.011 167,328
5,089,559
61,074,712
0.011 298,147
9,068,627
108,823,523
- 1,254,196
38,148,450
457,781,400
o All design calculations based on
maximum fully developed pit to
a depths of 150' & 300' below
grade
■ Note: Pit A = 46-ac + 2 ac of
additional stormwater drainage
area
o Average annual precipitation of
46.60 in/year

Prospect Hill Quarry Process
Wate
r
Storage
o Pond Capacity and Evaporation Rates
Water Storage Capacity
It
Pond
Capacity (gal)
Surface Area
Annual
Gallons
Gallons
Gallons
(sgft)
Evaporation (ft.)
Loss/Day
Loss/Month
Loss/Year
Settling Ponds
705,488
15,718
2.5
805
24,496
293,953
Plant Water Pond
1,447,000
31,862
2.5
1,632
49,655
595,858
Plant Make -Up Water Pond -A
2,574,947
43,324
2.5
2,220
67,517
810,209
Plant Make -Up Water Pond-B
27,801,126
406,355
2.5
20,820
633,281
7,599,366
Plant Make -Up Water Pond-C
6,868,167
185,945
2.5
9,527
289,784
3,477,404
Total
39,396,728
-
-
35,005
1,064,733
12,776,790
13 Average Evaporation for
North Carolina is 3' per year
■ Source USGS
o Note mom
■ Evaporation Rates can be Is.
increased via other industrial
practices
Evaporators (Average
increase of 25% to 60%)

Prospect Hill Quarry Process
Water Stora
0
It
Total Process Total Process
Total Storage Remaining
Total Process / Y Total Process Total Process
Loss
(gal da ) Loss Loss
Total Process
Excess Water Excess Wafer Excess Water Storage Capacity Capacity
(gal/Mo) (gal r.
/Y ) (gal/day)
(90l r.)
Loss /Y
(gal/day) da) (gal MoCapacity Remaining Balance for
/ Y / ) (gal/yr.) P Y 9
(gal) (gal/year) evaporation
Pit A @ 150'
-132,970-2,123,255-25,479,058 39,396,728 64,875,786 77,652,576
2,115,000 54,990,000 659,880,000 435,000 11,310,000
135,720,000
Pit A @ 300'
-30,512 993,176 11,918,112 39,396,728 27,478,616 40,255,406
Pit B @ 150'
-22,684 1,231,267 14,775,208 39,396,728 24,621,520 37,398,310
Pit B @ 300'
2,115,000 54,990,000 659,880,000 435,000 11,310,000
135,720,000
(31,411,855
165,837 6,965,448 83,585,373 39,396,728 (44,188,645) )
0 Pit A
a
Additional Notes
w
Pit A — operating loss for water through 150' pit depth no
additional water storage required
■ Pit B is to be opened at or near the completion of Pit A
■
Pit A — —3.9 million gallons excess water annually at 300' pit
■ Both working pits as demonstrated by our existing facilities to
depth to be stored in onsite pond system for future use or allowed
have multiple working levels, and an Internal working sump
to be evaporated
system providing additional storage capacity and operational
flexibility
■
Pit A has —30 to 60 year life span to reach calculated capacities
at 300' pit depth
■ Pit A - 1,555,355,057 gallon capacity when it reaches
equilibrium post dewatering at a 300 foot depth for the pit
a Pit B
phasing shown on the mine map. Pit A will reach equilibrium in
■
Pit B - —1 1 million gallons excess water annual at 150' pit depth to
—13 years post dewatering (-25' below the natural ground
be stored in onsite pond system for future use or allowed to be
surface) based on the Piedmont Geologic hydrogeological study
evaporated
infiltration rates and precipitation estimate
■
Pit B - —80 million gallons excess water annually at 300' pit depth
■ Remaining Pit A storage capacity post de -watering and
to be stored in combination of onsite pond system and/or Pit A
equilibrium is—324,333,295 gallons to its surface elevation
■
Pit B has —40-80 year life span to reach calculated capacities
■ Groundwater hydraulic conductivity/transmissivity of Pit A to
allow excess annual Pit B water to be absorbed through
infiltration to groundwater within 1.5 years

Prospect Hill Quarry Process
Water Storage
13 Storm Contingencies
Storm Contingencies Pit A (48-Acres)
Storm Contingencies Pit B (86-Acres)
It
Storm
Storm Accumulated Storm Event Inches/hr. Inches/day Feet Rainfall Cu.ft. Accumulated
Storm Event Inches/hr. Inches/day Feet Rainfall Cu.ft. Gallons Gallons
100 year storm 0.30
100 year storm
0.30
7.296
0.608
1,278,287
9,562,255
50 year storm
50 year storm
0.273
6.552
0.546
1,147,935
8,587,156
25 year storm
0.243
5.832
0.486
1,021,789
7,643,513
25 year storm
Storm Contingencies Ponds
Ponds
Storm Evens
Indnes/hr
Indnes/da
Feet
Rainfall
Storm Attunuloted
Freeboard Galion
Capacity of
Remaln g Freeboard (gallons)
y
CUA.
Gallons
(2-ft) Cu.ft
free Board
100 year storm
0.30
7.30
0.61
9,557
71,489
31,437 235,162
163,673
Settlkp Ponds
50 year storm
0.27
6.55
0.55
8,582
64,199
31,437 235,162
170,963
25 year star.
0.24
5.83
0.49
7,639
57,144
31,437 235,162
178,018
100 year storm
0.30
7.30
0.61
19,372
144,913
63,724 476,686
331,774
Plant Water Pond
50 year storm
0.27
6.55
0.55
17,397
130,135
63,724 476,686
346,551
25 year storm
0.24
5.83
0.49
15,485
115,835
63,724 476,686
360,852
100 year storm
0.30
7.30
0.61
26,341
197,043
86,647 648,167
451,124
Plans Make -Up Water
50 year storm
0.27
6.55
0.55
23,655
176,950
86,647 648,167
471,217
Pond -A
25 year storm
0.24
5.83
0.49
21,055
157,505
86,647 648,167
490,662
100 year storm
0.30
7.30
0.61
247,064
1,848,166
812,710 6,079,493
4,231,327
Plans Make -Up Water
Pond-B
50 year storm
0.27
6.55
0.55
221,870
1,659,702
812,710 6,079,493
4,419,791
25 year storm
0.24
5.83
0.49
197,489
1,477,317
812,710 6,079,493
4,602,176
100 year storm
0.30
7.30
0.61
113,054
845,705
13,736,334 102,754,921
101,909,216
Plant Make -Up Water
Pond-C
50 year storm
0.27
6.55
0.55
101,526
759,465
13,736,334 102,754,921
101,995,456
25 year storm
0.24
5.83
0.49
90,369
676,007
13,736,334 102,754,921
102,078,914
0.27
0.24
G
7.296 0.608 2,277,665 17,038,120
6.552 0.546 2,045,403.36 15,300,680
5.832 0.486 1,820,633.76 13,619,287
All analysis based on maximum pit designs being
achieved at the time of the event.
■ Pond Storage capacities total 39,396,728
Pit A
■ Ponds system capacity exceeds storm events
with annual excess water for maximum Pit A
extent
■ -21-million gallons annually in the event of a
100-year storm event
o Pit B
■ Ponds exceeds storm events with annual
excess water for maximum Pit B at 150'
depth, -32 million gallons annually in the
event of a 100-year storm event
■ Pit B storm events with annual excess water
for maximum Pit B extent and a 300' depth
--100 million gallons to be stored in Pit A
(~324,333,295 )

Attachment D
Table 2 Water Balance
Calculation Summary

Table 2 Prospect Hill Quarry Water Balance
Water Usage
Gallons/Day
Gallons/Month
Gallons/Year
Y Process Loss
Gallons
Loss/Day
Gallons
Loss/Month
Gallons
Loss/Year
Aggregates Process facility
2,100,000
54,600,000
655,200,000
20%
420,000
10,920,000
131,040,000
Dust Suppression
9,000
234,000
2,808,000
100%
9,000
234,000
2,808,000
MISC.
6,000
156,000
1,872,000
100%
6,000
156,000
1,872,000
Totals
2,115,000
54,990,000
659,880,000
435,000
11,310,000
135,720,000
Water Inputs
Stormwater Drainage
Acres
ft./day
Gallons/day
Gallons/Month
Gallons/Year
Groundwater Inflow Pit A 150'•
134,702
4,097,186
49,166,230
Groundwater Inflow Pit A 300'•
237,160
7,213,617
86,563,400
Groundwater Inflow Pit B 150"
114,169
3,472,640
41,671,685
Groundwater Inflow Pit B 300"
302,690
9,206,821
110,481,850
Mean Annual Rainfall PIT A"
2,102,447
48
0.011
167,328
5,089,559
61,074,712
Mean Annual Rainfall PIT B "`
3,746,160
86
1 0.011
298,147
1 9,068,627
108,823,523
Totals
5,848,607
1
1,254,196
1 38,148,450
457,781,400
Water Balance Pit A
Gallons/day Gallons/Month Gallons/Year
Total Process Loss
435,000
11,310,000
1 135,720,000
Water Inputs 150' depth
302,030
9,186,745
110,240,942
Water Inputs 300' depth
404,488
12,303,176
147,638,112
Remaining Excess Water @150'
-132,970
-2,123,255
(25,479,058)
Remaining Excess Water @300'
-30,512
993,176
11,918,112
Water Balance Pit B""
Gallons/day Gallons/Month Gallons/Year
Total Process Loss
435,000
11,310,000
1 135,720,000
Water Inputs 150' Depth
412,316
12,541,267
150,495,208
Water Inputs 300' Depth
600,837
18,275,448
219,305,373
Remaining Excess Water @150'
-22,684
1,231,267
14,775,208
Remaining Excess Water @300'
165,837
6,965,448
83,585,373
Notes:
• Gallons per day documented with the groundwater study
• • Pit A at Max Design Extent (Pit A = 46-ac + 2 additional acres of Additional Stormwater drainage area)
• •' Pit B at Max Design Extent
• `"* Pit B Groundwater and Stormwater Inflows to be pumped to Pit A
Pit A capacity (gal) 1,879,688,352 324,333,295 post equilibrium
Water Storage Capacity
Pond
Capacity (gal)
Surface Area
(sgft)
Annual
Evaporation (ft.)
Gallons
Loss/Day
Gallons
Loss/Month
Gallons
Loss/Year
Settling Ponds
705,488
15,718
2.5
805
24,496
293,953
Plant Water Pond
1,447,000
31,862
2.5
1,632
49,655
595,858
Plant Make -Up Water Pond -A
2,574,947
43,324
2.5
2,220
67,517
810,209
Plant Make -Up Water Pond-B
27,801,126
406,355
2.5
20,820
633,281
7,599,366
Plant Make -Up Water Pond-C
6,868,167
185,945
2.5
9,527
289,784
3,477,404
Total
39,396,728
-
35,005
1,064,733
12,776,790
teiv�cgc
e�maining
Total Process (gal/day)
Total Process
Total Process
Total Process
Total Process
Total Process
Excess Water
Excess Water xcess Water
Total Storage
Capacity
Capacity
(gal/Mo)
(gal/yr.)
Loss (gal/day)
Loss (gal/Mo)
Loss (gal/yr.)
(gal/day)
(gal/Mo) (gal/yr.)
Capacity (gal)
Remaining
Balance for
(gal/year)
evaporation
Pit A @ 150'
2,115,000
54,990,000
659,880,000
435,000
11,310,000
135,720,000
132,970
2,123,255 25,479,058
9,3'.a6,718
ti ,875,786
77,552,576
Pit @ 300'
30,512
993,176 11,918;11,2
3%396.328
27,478;616
j 40,255,406
Pit B @ 150'
2,115,000
54,990,000
659,880,000
435,000
11,310,000
135,720,000
22,684
1,231,267
396;728
24,621,52t)
3/ ,96 310
Pit B @ 300'
165,837
1 6,965,448
111V06,72R
(44.188,6451
31,411.;�55�
Storm Contingencies Pit A (48-Acres'•)
Storm Event
Inches/hr.
Inches/day
Feet
Rainfall Cu.ft.
Storm
Accumulated
Gallons
100year storm
0.30
7.296
0.608
1,278,287.51
9,562,255.27
50year storm
0.273
6.552
0.546
1,147,935.82
8,587,156.87
25 year storm
0.243
5.832
0.486
1,021,789.03
7,643,513.26
Storm Contingencies Pit B (86-Acres***)
Storm event
Inches/hr.
Inches/day
Feet
Rainfall Cu.ft.
Storm
Accumulated
Gallons
100 year storm
0.30
7.296
0.608
2,277,665.28
17,038,120.68
50 year storm
0.27
6.552
0.546
2,045,403.36
15,300,680.74
25 year storm
0.24
5.832
0.486
1,820,633.76
13,619,287.25
Storm Contingencies
Ponds
Ponds
Storm Event
Inches/hr.
Inches/day
Feet
Rainfall Cu.ft.
Storm
Accumulated
Gallons
Freeboard (2-ft)
Cu.ft
Gallon Capacity of
free Board
Remaining
Freeboard
(gallons)
100year storm
0.30
7.30
0.61
9,557
71,489
31,437
235,162
163,673
Settling Ponds
50 year storm
0.27
6.55
0.55
8,582
64,199
31,437
235,162
170,963
25 year storm
0.24
5.83
0.49
7,639
57,144
31,437
235,162
178,018
100year storm
0.30
7.30
0.61
19,372
144,913
63,724
476,686
331,774
Plant Water Pond
50 year storm
0.27
6.55
0.55
17,397
130,135
63,724
476,686
346,551
25 year storm
0.24
5.83
0.49
15,485
115,835
63,724
476,686
360,852
100year storm
0.30
7.30
0.61
26,341
197,043
86,647
648,167
451,124
Plant Make -Up Water Pond -A
50 year storm
0.27
6.55
0.55
23,655
176,950
86,647
648,167
471,217
25 year storm
0.24
5.83
0.49
21,055
157,505
86,647
648,167
490,662
100 year storm
0.30
7.30
0.61
247,064
1,848,166
812,710
6,079,493
4,231,327
Plant Make -Up Water Pond-B
50 year storm
0.27
6.55
1 0.55
221,870
1,659,702
812,710
6,079,493
4,419,791
25 year storm
0.24
5.83
0.49
197,499
1 1,477,317
812,710
6,079,493
4,602,176
100 year storm
0.30
7.30
0.61
113,054
845,705
13,736,334
102,754,921
101,909,216
Plant Make -Up Water Pond-C
50 year storm
0.27
6.55
0.55
101,526
759,465
13,736,334
102,754,921
101,995,456
25 yearstorm
0.24
5.83
0.49
90,369
676,007
13,736,334
102,754,921
102.078.914