NCG020981_Response to Questions_20211118

ain, PHONE. [phone]
FAX. [phone]
POST OFFICE BOX 1436
Sand & Gravel, INC. SWANSBORO, NC 28584
November 18, 2021
Adam Parr, P.E.
Assistant State Mining Engineer
N.C. Dept. of Environmental Quality
Division of Energy, Minerals, and Land Resources
1612 Mail Service Center
Raleigh, NC 27699-1612
Re: Carteret Dirt Pit
Carteret County
White Oak River Basin
Dear Mr. Parr,
Attached to this letter are responses to your request for information dated October 5, 2021.
We have responded to Question 1 in a separate package and we have responded to questions 2 and 3
in a combined package because the questions are essentially the same.
Sincerely,
Charles R. Wil
President
Sunland Sand
Gravel, Inc.

Sand & Gravel, INC.
Response to Question 1
Theoretical Givens:
1) Maximum Dewatering Discharge by Permit 900,000 gallons
2) Gallons of water per cubic foot is 7.48 gallons
3) Four tide cycles per 24 hour period
Calculations:
PHONE: [phone]
FAX: [phone]
POST OFFICE BOX 1436
SWANSBORO, NC 28584
• 9,377,045 square foot area Goose Creek Basin (see GIS Map Attachment)
• Approximate 5 vertical foot tide change between Low -: High tide or High Low every
6 hours (see Tide Forecast attached)
• 9,377,045 SF x 5 FT = 46,885,225 Cubic Feet
• 46,885,225 cubic feet / 7.48 Gal/Cubic Feet = 6,268,079 gallons every 6 hours
• 6,268,079 gallons x 4 flushes per day = 25,072,316 gallons flow per 24 hours
Based on conversations where we discussed the flow requirements ie: 7Q10 (similar) value, the
900,000 gallons of discharge daily (maximum) is only 3 % % of 25,072,316 gallons
7Q10 similar flow, which is far below the 50% benchmark we discussed.

Sand & Gravel, INC
Response to Questions 2 and 3
PHONE: [phone]
FAX: [phone]
POST OFFICE BOX 1436
SWANSBORO, NC 28584
Based on review of several research papers, it appears that the salinity in the estuaries of
Coastal North Carolina range from 3 PPT to 20 PPT with a normal or average salinity of 11 PPT,
PPT being parts per thousand.
If you do the calculations based on Hamza's Reef Salt Water Calculator you find the following:
• 25,072,316 gallons of salt water with a salinity of 11 PPT represents 2,712,107 Ibs of salt
• 900,000 gallons of salt water with a salinity of 11 PPT represents 97,354 lbs of salt
• 97,354 Ibs of salt represent about 3 % % of 25,072,316 Ibs of salt
Theoretically if you reduce the normal salinity of 11 PPT by 3 Y2 , the new salinity of the
captured body of water would be 10.6 PPT
With a range of 3 PPT to 20 PPT for estuaries in our area a deviation of 3 % % (.358 PPT) is
insignificant to the normal volatility and should have no effect of the system.
The question of temperature effects on the water is, we expect none. The dewatering plan is
to pump into an 8 % acre pond approximately 20 feet deep and allow the water to adjust to
ambient temperature before natural discharge.
The second part of question 2 and 3 is the verification of the first part through the use of a
pumping operation and monitoring plan (POM). Our POM is as follows:
1. Establish a benchmark by which we can evaluate the data provided by the POM
• We are going to check the temperature and salinity of the Bogue Sound Water
twice a day for 1 month in 3 locations (map provided).
• We will take that data and create a chart/graph to compare to the data after
pumping begins
• Once pumping begins we will record the results using the same method for a
period of 2 months and compare to the benchmark data.

• If we discover any significant variations from the benchmark data or our
expected results, we will cease pumping and re-evaluate the options.
• If we discover no significant variations, we will progress to a one month annually
testing procedure to monitor for any changes.

Sand & Gravel, INC.
SUMMARY
PHONE: [phone]
FAX: [phone]
POST OFFICE BOX 1436
SWANSBORO, NC 28584
In summary we expect no significant changes resulting from our proposed pumping plan and have established a
POM to monitor and verify that no changes are occurring. We are also proposing to immediately cease pumping
discharge if any changes should begin to occur.
Sincerely,
Charles R. Williforda
Sunland Sand and Gravel, Inc.

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