NCG120087 DMR SW (4)

SMITH+6ARONER
EN61NEERS
March 10, 2015
Mr. John Holley, P.E.
ADDRESS TEL WEB
14 N. Boylan Avenue, Raleigh NC 27603 919.828.0577 www.smitligardnerinc.com
Regional Engineer
Division of Energy, -Minerals and Land Resources -
1628 Mail Service Center
Raleigh, NC 27699
RE: Tier 3 Notification
Johnston County Landfill
Certificate of Coverage#NC6120087
General Permit#NCG120000
Dear Mr. Holley:
MARr22o15.
EVVtR RAL P/LES
ooN
On behalf of Johnston County, Smith Gardner Inc. (S+G) has prepared this official notification
to the Division of Energy, Minerals and Land Resources (DEMLR) - Stormwater Permitting
Program to inform you.that the.Johnston County Landfill (COC#NCG120087) has entered Tier
3 status due to four (4) exceedances over the TSS benchmark value at SDO 4A -5A, during this
permit term.
CURRENT NPOES PERMIT STATUS
As you are,aware, Representative Outfall Status (ROS) was granted' for the site in August
2014 following a stormwater records review and site visit by the DEMLR-Stormwater
permitting program. Since the current permit was issued (November 2012), the Johnston
County Landfill has conducted qualitative monitoring at SDO 4A -5A ten (10) times (as shown
in the table below). Please note that SDO 4A -5A is has not been in Tier 2 status for TSS prior
to the last sampling event (February 2015), when this outfall went into Tier 2 and Tier 3
status simultaneously for TSS.
S00 4A -5A —TSS ANALYTICAL MONITORING RESULTS (2012-2014)
DATE
TSS (Benchmark=100)
September 2012
4.4
November 2012
34
December 2012
630 _
January 2013
44
February 2013
58
March 2013
89
November 2013
22
March 2014
330
December 2014
90
January 2015
1,500
February 2015
150
'.Approval Letter - Request for Representative Outfall Status & Compliance Evaluation Inspection -
Johnston County Landfill. DEMLR. August 19, 2014.

Mr. John Holley,P.E.
March 10, 2015
Page 2of2
ON-GOING SITE IMPROVEMENT STATUS
SDO 4A -5A has a drainage area that encompasses the area of a significant portion of the
active operations at the landfill.. Daily cover and other exposed soils in this area area
necessity for daily operations at the facility. Several best management practices have been
utilized in this;area in accordance with the approved erosion and sediment control plan.
Below is'a list of site practices that are in use to minimize TSS levels at this SDO:
• Stabilization of outer landfill slopes draining to basin (in addition to grass, wood chips
have been used frequently);
• Use of slope drains;
• Installation of rip -rap channels in high flow areas;
• Installation of check -dams and filter berms;
• Placement of coir -fiber wattles in channels; and
• Regular maintenance of Basin 5A (including removal of sediment from basin and
replacement of stone surrounding the riser structure).
PLANNED ADDITIONAL MEASURES
At this time, Johnston County is prepared to continue the above BMPs that have shown to
reduce TSS in most conditions. In addition to these items. Johnston County plans to move
this sampling location (SDO 4A -5A) approximately 700 feet toward the property line where
the stormwater from this basin actually leaves the property.
Johnston County will monitor this outfall monthly until three (3) consecutive events
measuring under the TSS thresholds have.been confirmed.;
Please contact me by phone [phone], ext. 224) or by email below with any questions or
comments.
Sincerely,
SMITH GARON C.
0'
Don M. isenheimer
Project Scientist, ext. 224
don fdsmithgardnerinc.com
dmm
Cc.
David Parnell, NCDENR
Rick Proctor, Johnston County
Kevin Shields, Johnston County
Pieter K. Scheer, P.E., S+G
File C:\Users\donmisenheimer\Desktop\notification letterjoco.docx