NCG120023 DMR SW (15)

CDM
Smith
5400 Glenwood Avenue,Suite 400
Raleigh,North Carolina 27612 •
tel: [phone]
fax [phone]
DECEIVED
July 13, 2016 JUL 19 2016
Attention: Central Files CENTRAL FILES
DWR SECTION
North Carolina Department of
Environmental Quality
Division of Water Resources
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Subject: Semi-Annual Discharge Monitoring and Tier Two Sampling Report
Monitoring Period:January 1 through June 30, 2016
Onslow County Landfill: Permit Number 67-09
Certificate of Coverage Number: 12,601V
To the Division of Water Resources:
CDM Smith Inc.,on behalf of Onslow County(County), is submitting two copies of the Stormwater
Discharge Monitoring Report for the Onslow County Landfill. Samples were collected from Outfalls 2
and 3 on May 31,2016,after the facility received 1.38 inches of precipitation. Outfall 1 currently
receives stormwater runoff from the closed portion of the Subtitle D landfill and was removed from
the analytical monitoring requirements following a Division of Water Quality inspection on January 23,
2013.All samples were analyzed for fecal coliform,chemical oxygen demand (COD), and total
suspended solids by Pace Analytical Services, Inc., located in Raleigh, North Carolina.
Samples collectedfrom Outfall 2 had detections of COD (147 milligrams per liter(mg/L)) and fecal
coliform (6,000 colonies per 100 milliliters (mL)) above their respective benchmark value.The
benchmark values for COD and fecal coliform are 120 mg/L and 1,000 colonies per 100 mL,
respectively.Samples collected from Outfall 3 were below the benchmark values with the exception
of COD (152 mg/L).
Tier Two monitoring was implemented for Outfall 3 in January 2015 after consecutive detections of
COD above the benchmark value.Stormwater from Outfall 3 is discharged to a former borrow pit and
does not leave the property.The drainage area for Outfall 3 includes the partially closed and active
operations area of the east slope of the Subtitle D landfill. Elevated COD at Outfall 3 is a result of
washouts on the active slope. Per the County's Tier One responses and operations plan,all washouts
are repaired and the slope is reseeded as necessary following precipitation events.
Per the Tier 2 response requirements,samples will be collected monthly for all parameters from
Outfall 3 until three consecutive sampling events show the parameters are below the benchmark
WATER+ENVIRONMENT+TRANSPORTATION+ENERGY+FACILITIES

7-11-6-61111.
Smith
Division of Water Resources
July 13, 2016
Page 2
values. Monthly monitoring in accordance with the Tier 2 requirements will continue.The County will
maintain a record of the Tier 1 and 2 responses and monitoring results at the landfill.
If you have any questions or require further explanation,do not hesitate to call me at(919) 325-3566.
Sincerely,
Daniel H. Forbes
CDM Smith Inc.
cc: Scott Bost, Onslow County
Mathew Colone, CDM Smith Inc.
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Semi-annual Stormwater Discharge Monitoring Report
for North Carolina Division of Water Quality General Permit No. NCG120000
Date submitted July 5, 2016
CERTIFICATE OF COVERAGE NO. NCG12 0 0 2 3 SAMPLE COLLECTION YEAR 2016
FACILITY NAME Onslow County Landfill SAMPLE PERIOD X❑Jan-June ❑July-Dec
COUNTY Onslow or XD Monthly1 May (month)
PERSON COLLECTING SAMPLES Mark Darwin DISCHARGING TO CLASS ❑ORW ❑HQW ❑Trout ❑PNA
LABORATORY Pace Analytical, Inc. Lab Cert.# 37712/37731 • ❑Zero-flow ❑Water Supply EISA
Comments on sample collection or analysis: X❑Other Former Borrow Pit
PLEASE REMEMBER TO SIGN ON THE REVERSE 4
Part A: Stormwater Benchmarks and Monitoring Results
No discharge this period?2
Date Sample 24-hour rainfall -
Outfall No. 1
Collected amount,
(mo/dd/yr) Inches3 Chemical Oxygen Demand Fecal Coliform Total Suspended Solids
Benchmarks===> - - 120 mg/L 1000 count per 100 mL 100 mg/L or 50 mg/L4
2 5/31/16 1.38 147 6,000 18.9
3 5/31/16 1.38 152 200 50.5
1 Monthly sampling (instead of semi-annual) must begin with the second consecutive benchmark exceedance for the same parameter at the same outfall.
2 For sampling periods with no discharge at any single outfall,you must still submit this discharge monitoring report with a checkmark here.
3The total precipitation must be recorded using data from an on-site rain gauge. Unattended sites may be eligible for a waiver of the rain gauge requirement.
4 See General Permit text,Table 3, identifying the especially sensitive receiving water classifications where the more protective benchmark applies.
Note: Results must be reported in numerical format. For example,do not report Below Detection Limit, BDL,<PQL, Non-detect, ND, or other similar non-
numerical format. When results are below the applicable limits,they must be reported in the format,"<XX mg/L",where XX is the numerical value of the
detection limit, reporting limit, etc. in mg/L. Conversely,where fecal coliform results exceed the dilution upper limit, report the result as">XX".
Note: If you report a sample value in excess of the benchmark,you must implement Tier 1, Tier 2, or Tier 3 responses. See General Permit text.
Permit Date: 11/1/2012-10/31/2017 SWU-248, last revised 10/25/2012
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Part B: Vehicle Maintenance Area Monitoring Results:only for facilities averaging>55 gal of new oil per month.
n No discharge this period?2
•
Date Sample 24-hour rainfall
Outfall No. Collected' amount, Non-polar O&G/TPH by
(mo/dd/yr) Inchess EPA 1664(SGT-HEM) Total Suspended Solids pH
Benchmarks===> - - 15 mg/I. 100 mg/L or 50 mg/L4 6.0—9.0 SU
Footnotes from Part A also apply to this Part B
Note: If you report a sample value in excess of the benchmark,you must implement Tier.2, Tier 2, or Tier 3 responses. See General Permit text.
FOR PART A AND PART B MONITORING RESULTS:
® A BENCHMARK EXCEEDANCE TRIGGERS TIER 1 REQUIREMENTS. SEE PERMIT PART 11 SECTION B.
m 2 EXCEEDANCES IN A ROW FOR THE SAME PARAMETER AT THE SAME OUTFALL TRIGGER TIER 2 REQUIREMENTS. SEE PERMIT PART Il SECTION B.
® TIER 3: HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES FOR THE SAME PARAMETER AT ANY ONE OUTFALL? YES NO❑
IF YES,HAVE YOU CONTACTED THE DWQ REGIONAL OFFICE? YES ®NO El
REGIONAL OFFICE CONTACT NAME: Bethany Georgoulias
Mail an original and one copy of this DMR,including all"No Discharge"reports,within 30 days of receipt of the lab results(or at end of monitoring period
in the case of"No Discharge"reports) to:
Division of Water Quality
Attn:DWQ Central Files
1617 Mail Service Center
Raleigh,North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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. l
am aware that there are significant penalties for submitting false information,including the possibility of fines and imprisonment for knowing violations."
;,7'6.
ignature of Permittee) (Date)
Permit Date: 11/1/2012-10/31/2017 SWU-248,last revised 10/25/2012
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