8003_RowanCountyMSWLF_Notification_DIN28049_20160801

Golder Associates NC, Inc. 5B Oak Branch Drive
Greensboro, NC 27407 USA
Tel: [phone] Fax: [phone] www.golder.com
Golder Associates: Operations in Africa, Asia, Australasia, Europe, North America and South America
Golder, Golder Associates and the GA globe design are trademarks of Golder Associates Corporation
October 13, 2016 Project No. 0636572016
Ms. Jaclynne Drummond
Compliance Hydrogeologist
North Carolina Department of Environmental Quality
Division of Waste Management – Solid Waste Section
2090 US Highway 70
Swannanoa, North Carolina 28778
[phone]

RE: 14-Day Notification and Alternate Source Demonstration for Barium and Cobalt in MW-28
Rowan County Municipal Solid Waste Landfill, Permit No. 80-03
789 Campbell Road, Woodleaf, Rowan County, North Carolina

Dear Jackie:
On behalf of Rowan County’s Department of Environmental Management (Rowan County), Golder
Associates NC, Inc. (Golder) is submitting this 14-Day Notification as required by North Carolina Solid
Waste Management Regulation (NCSWMR) 15A North Carolina Administrative Code (NCAC) 13B
.1633(c)(1). The 14-Day Notification of Groundwater Protection Standard Exceedance(s) form is included
as Attachment 1.
1.0 14-DAY NOTIFICATION [15A NCAC 13B .1633(C)(1)]
Table 1 (shown below) summarizes the NC Appendix I constituents that were detected above their
respective solid waste section limits (SWSLs) and NC 2L Groundwater Standards or Solid Waste Section
groundwater protection standards (GPSs) during the 2nd Semiannual Water Quality Monitoring Event
conducted at the Rowan County municipal solid waste (MSW) landfill on August 1 – 4, 2016:
Table 1: 14-Day Notifications
Constituent: Location: Result (µg/L): SWSL (µg/L): NC2L or GPS
(µg/L):
Approved
ASD:
Barium MW-28 1500 100 700 No
Chromium MW-9 10.6 10 10 No
Cobalt MW-28 29.2 10 1 No
Note: µg/L = micrograms per liter
2.0 ALTERNATE SOURCE DEMONSTRATION [15A NCAC 13B .1633(C)(3)]
As allowed under 15A NCAC 13B .1633(C)(3), the County has prepared an alternate source demonstration
(ASD) in reference to the concentrations of barium and cobalt in samples from monitoring well MW-28. As
shown, chromium was detected in samples from MW-9; however, because MW-9 is one of the facility’s two
upgradient background wells the concentrations of chromium in MW-9 are considered naturally occurring
(i.e., background) and no further action is warranted for this detection.
The Summary of Statistical Analysis (Attachment 2) summarizes the statistical methods and results used
to determine an appropriate background concentration for barium and cobalt in MW-28. The statistical
Ms. Jaclynne Drummond October 13, 2016
NCDEQ, Compliance Hydrogeologist 3 Project No. 0636572016

g:\projects\rowan\0636572016\250 final reports\203 final 2016 2nd semiannual wqmr\2016-10-11 notification & asd\2016-10-13 final notification & asd.docx

cc: Caleb Sinclair, Rowan County Environmental Management, 1102 N Long Street Extension
Salisbury, NC 28144, [e-mail] (letter only)

Jeff Boyd, Landfill Manager, 789 Campbell Road, Woodleaf, NC 27054, [phone]

Mike Plummer, P.E., HDR, 440 South Church Street, 10th Floor, Charlotte, NC 28202,
[phone], [e-mail] (electronic copy)

ATTACHMENT 1

ATTACHMENT 2
October 2016 1 of 1
Attachment 2
Project No. 0636572016
Attachment 2.xls
MW-1 MW-7 MW-11 MW-12 MW-13 MW-20 MW-23 MW-23A MW-24R MW-25 MW-26 MW-27 MW-28 French Drain
Interwell Nonparametric Prediction Interval 497
Intrawell MW-28 Upper Tolerance Limit 2217
Chromium ug/L Interwell ND 2.68 J 1.48 J ND 3.32 J ND 1.81 J 4.27 J ND 2.99 J ND ND ND ND
Intrawell MW-28 Upper Tolerance Limit 29.6
Notes:1. Shaded values represent apparent statistical significant increases (SSIs) over background concentrations.
2. Statistical worksheets are provided as Appendix 3.
3. ug/L = micrograms per liter
4. J = estimated concentration below the Solid Waste Section Limit
5. B = blank-qualified
6. ND = not detected above laboratory detection limit
7. -- = no data available
8. No SSIs were identified during the August 2016 event.
29.2 ND
1500 27.1 J
1.26 J ND ND ND
53.5 J
ND
23.8 J 67.1 J
3.37 J ND ND ND ND 7.98 J
102 135
Statistical Evaluation Method
Municipal Solid Waste (MSW) Landfill
ug/L
79.6 J 56.0 J 51.9 J 52.4 J 94.5 J 44.3 J 54.4 J
ND
August 2016
Barium
Cobalt
ug/L
Summary of Statistical Analysis
Rowan County, North Carolina
Detected Monitoring
Constituent/Analyte
Reporting
Units
Prediction
Interval

ATTACHMENT 3

ATTACHMENT 4
October 2016 1 of 1
Attachment 4
USGS National Geochemical Survey Database SummaryRowan County, North Carolina
Project No. 0636572016
G:\PROJECTS\Rowan\0636572016\250 FINAL Reports\203 FINAL 2016 2nd Semiannual WQMR\2016-10-11 Notification & ASD\Attachment 4.xlsx
Sample #NURE ID Lab ID Sample Date Type Datum Latitude Longitude Ba (Max) Concentration (ppm)Method
1 5283783 C-110213 09/08/76 Sediment NAD27 35.6236 -80.6629 1030 ICP4025283727C-110080 09/07/76 Sediment NAD27 35.5717 -80.3031 283 ICP10
3 5283635 C-143888 09/06/76 Sediment NAD27 35.7420 -80.5887 615 ICP40
4 5283653 C-143056 09/06/76 Sediment NAD27 35.7849 -80.7060 128 ICP40
Average 514
Sample #NURE ID Lab ID Sample Date Type Datum Latitude Longitude Co (Max) Concentration (ppm)Method
1 5283783 C-110213 09/08/76 Sediment NAD27 35.6236 -80.6629 5.77 INAA
2 5283727 C-110080 09/07/76 Sediment NAD27 35.5717 -80.3031 10 ICP40
3 5283635 C-143888 09/06/76 Sediment NAD27 35.7420 -80.5887 20 ICP4045283653C-143056 09/06/76 Sediment NAD27 35.7849 -80.7060 19 ICP40
Average 13.7
Barium
Cobalt