NCG020123 DMR SW 20210216

ANNUAL SUMMARY DISCHARGE MONITORING
REPORT (DMR) - STORMWATER
SUBMIT TO CENTRAL OFFICE*
General Permit No. NCG020000
Calendar Year 2020
'Report ALL STORMWATER monitoring data on this form (include "No Flow"P'No Discharge" and Benchmark
Exceedances) from the previous calendar year to the DEQ by MARCH 1 of each year.
Certificate of Coverage No. NCG020123
Facility Name: Martin Marietta Materials, Inc. - Benson Quarry
County: Johnston
Phone Number [phone] Total no. of SDO's monitored 1
Certified Laboratory Pace Analytical Lab # 12
Lab #
Stormwater Discharge Outfall (SDO) No. 1 VMA Outfall? Yes No X
Is this outfall currently in Tier 2 for any parameter? Yes No X
Was this outfall ever in Tier 2 during the past year? Yes No X
If this outfall was in Tier 2 last year, was monthly monitoring discontinued? RECEIVED
Yes, enough consecutive samples below benchmarks to decrease frequency
Yes, received approval from DEMLR to reduce monitoring frequency FEB 2 3 2021
No, turbidity benchmark exceedances did not require monthly monitoring CENTRAL FILES
Other DWR SECTION
Outfall No.
-----------
Total
Rainfall,
inches
TSS
mg/I
SS,
ml/1
Turbidity,
NTU
Upstream
(U) Turbidity
NTU
Downstream
(D) Turbidity
NTU
Non -polar
O&G, mg/I
VMA
New
Motor Oil
Usage
al/mo.
Stormwater
Benchmarks
Intlicate NO
FLOW
00 icabre
cirrle
Benchmark
100 50
0.1
circa
Becild
5�f25/10
NA
water Quality
Standards lies
NA
water Quality
standard aopl;es
15
55e requires
average requires
T55 and Non -polar
O&G monitoring
Date Sample
Collected,
mo/dd/yr
6/19/20
2.1
20.5
ND
68.5
12/8/20
0.2
12.2
ND
16.8
Permit Date 1011/2015 - 9/30/2020
Last Revised 101212015

Certificate of Coverage No. NCG020123
CERTIFICATION
"I certify, under penalty of law, that this document and all attachments were prepared under my direction or
supervision in accordance with a system designed to assure that qualified personnel properly gather
and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or
those persons directly responsible for gathering the information, the information submitted is, to the best of my
knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for
submitting false information, including the possibility of fines and imprisonment for knowing violation."
[Required by 40 CFR §122.22] _
Signature
Date
Mail Annual Summary Stormwater DMR to the NCDEQ Central Office:
Note the address is correct- Central Files is housed in DWR (not DEMLR)
N.C. Department of Environmental Quality (DEQ)
Division of Water Resources
Attn: DWR Central Files
1617 Mail Service Center
Raleigh, NC 27699-1617
Central Files Telephone [phone]
Questions? Contact DEMLR Stormwater Permitting Staff in the Central Office at:
[phone]
Permit Date 1011/2015 - 9/30/2020
Last Revised 101212015