1906_McGill_preapprove_20220810

From: Wilson, Donna J
Sent: Wednesday, August 10, 2022 2:40 PM
To: Misti Godwin ([e-mail])
Cc: Kirchner, Chuck; Stanley, Sherri
Subject: Pre -approval for WWTP biosolids/sludges for McGill Compost, 1906
Hello Misti,
This email is a continuation of the pre -approval process for acceptance of wastewater treatment plant sludges/biosolids
at the McGill compost facility. It was started in July 2016.
The Solid Waste Section has agreed to a pre -approval process for acceptance of new municipal wastewater treatment
sludge (biosolids) sources for feedstock acceptance at the McGill - Merry Oaks Compost Facility.
• Analytical data for the biosolids should be run for total metals, by methods in SW-846, or equivalent method.
• The results should be compared to the ceiling concentrations for metals in Table 1 of the 503 Rules for sewage
sludge (Table 1 of 503.13), see below.
• If the analytical results for each of the metals is below the ceiling concentrations for the metals in the Rule, then
it can be accepted.
• Notification should be sent to our office providing information on the new biosolids feedstock, including the
analytical data, a statement that the results are below the 503 Table 1 ceiling concentrations, and a statement
that it will be accepted.
• This pre -approval process is for biosolids generated at municipal wastewater treatment plants. Analytical data
for sludge or biosolids generated by industrial and commercial sources should continue to be sent to our office
for approval, because of the unknown constituents.
Table 1 of 503.13 Ceiling Concentrations are:
Arsenic 75 mg/kg (milligrams per kilogram)
Cadmium 85 mg/kg
Copper 4300 mg/kg
Lead 840 mg/kg
Mercury 57 mg/kg
Molybdenum 75 mg/kg
Nickel 420 mg/kg
Selenium 100 mg/kg
Zinc 7500 mg/kg
The 503 Rules are federal standards for sewage sludge and may be modified occasionally, and our rules would copy the
change. They can be found in the Code of Federal Regulations, 40 CFR Part 503. The current web address is:
http://www. ecfr.gov/cgi-
bin/retrieveECFR?Lyp=2&SID=3ba5c96eb4bfc5bfdfa86764a30e9901&tv=HTML&h=L&n=at40.30.503&r=PART#se40.32.50
3 113
It would be helpful if you included a copy of this email with future submittals of new WWTP sources.
If you have any questions, please let me know.
Donna

Donna J_ WIhon
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Ena ineering Project iWanagen Solid Waste Section
Division of Waste z'l cxnagement
North Carolina Department of Environmental Quality
919.707.8255 (Office)
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Physical Address: 217 West Jones Street, Raleigh NC 27603
Mailing address: 16-0-6 Mail entice Center, Raleigh SIC 27699
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