5103_JohnstonCoMSW_LeachateAssmtRpt_DIN28635_20171013

October 13, 2017

Ms. Jaclynne Drummond
NCDEQ - Division of Waste Management
Asheville Regional Office
2090 U.S. 70 Highway
Swannanoa, NC 28778-8211

RE: Leachate Release Response Results
Johnston County Landfill
Smithfield, North Carolina

Dear Ms. Drummond:

Smith Gardner, Inc. (S+G) on behalf of Johnston County is pleased to present this brief letter
report summarizing the Release Response Investigation at the Johnston County Landfill.
S+G followed the approved Leachate Release Plan to evaluate the potential impact of this
release.

Soil Sample Collection and Analysis

S+G personnel mobilized to the site on September 14, 2017 to collect soil samples from the
release area, to collect a background soil sample, and to collect one surface water sample.

In accordance with the work plan, on September 14th, S+G collected discreet grab samples
from at or near the ground surface of the release area (SS-1 and SS-2). Due to the naturally
occurring inorganic metals in the soils of North Carolina, S+G also collected a background
sample (SS-3), upgradient and away from the release area (near the site entrance) to
evaluate the concentrations of naturally occurring constituents. Sampling locations are
shown on Figure 1.

Samples were collected in the laboratory provided bottles and were shipped to the laboratory
under proper chain-of-custody (COC). Prism Laboratories, Inc., in Charlotte, NC, a North
Carolina certified laboratory (NC Certification No.: 402) performed the analysis. Collected
samples were analyzed for the Appendix I list of constituents (40 CFR 258 Appendix I).
Additionally, soil samples were analyzed for Nitrate as N, Sulfate and Phosphorus.
Laboratory analysis is included as Attachment 1.

Sample results from the release area were compared to the background sample and the
NCDEQ IHSB Preliminary Soil Remediation Goals (PRGs) as well as the industrial use PSRGs.
The only volatile organic compounds detected were acetone, methyl ethyl ketone and methyl
isobutyl ketone. These constituents were detected at very low and similar concentrations in
the soil samples which could be indicative of lab contamination. Several inorganic
constituents were detected in the soil samples, including the background sample. These
Ms. Drummond
October 13, 2017
Page 2 of 2
inorganic constituents are naturally occurring in North Carolina soils and can have variable
concentrations in natural conditions. Cobalt and vanadium were detected in samples SS-1
and SS-2 at concentrations above their PSRGs for protection of groundwater; however, the
groundwater at this facility has been impacted by landfilling activities prior to 1993. Due to
the site use and groundwater condition we believe it is more appropriate to use the industrial
use PSRGs.

The surface water sample collected does not indicate exceedances of surface water
standards (15A NCAC 2B.0100 et seq) for this surface water body. Sample results with
standards are presented in Table 1.

Summary and Conclusions

Inorganic constituents are naturally occurring in North Carolina soils. The analytical results
do not indicate impact from the release on the remaining soils or surface water at this facility
and no further investigation is warranted at this time.

If you have any questions or require additional information, please contact us at 919-828-
0577 or by email below.

Sincerely,
SMITH GARDNER, INC.

Madeline German, P.G. Joan A. Smyth, P.G.
Project Geologist Senior Hydrogeologist
[e-mail] [e-mail]

Attachments - Figure 1

cc: Rick Proctor – Johnston County
Liz Patterson – NCDEQ
File

H:\Projects\Johnston County (NC)\Leachate Release\Leachate Release Investigation Plan.docx
DRAWN:APPROVED:SCALE:DATE:PROJECT NO.:FIGURE NO.:FILE NAME:
PREPARED FOR:PREPARED BY:
SMITH
14 N. Boylan Avenue, Raleigh NC 27603
NC LIC. NO. F-1370 (ENGINEERING)
919.828.0577
GARDNER+G:\CAD\Johnston\John 17-2\sheets\JOHN-A0733.dwg - 9/8/2017 9:38 AM© 2017 Smith Gardner, Inc.
JOHNSTON COUNTY LANDFILL
SOIL AND SURFACE WATER
SAMPLING LOCATIONS
C.T.J.M.M.G.AS SHOWN JOHNSTON 17-2 2 JOHN-A0733Sep 2017
SAMPLE LOCATION 1
SAMPLE LOCATION 2
SWPT-2
Table 1 Detected ConstituentsJohston County C D LandfillSeptember 14, 2017By: JSDate: 10/11/17Detected ConstituentsNCDENR IHSB Preliminary Soil Remediation Goals (PRGs) (mg/kg) Groundwater Protection NCDENR IHSB Preliminary Soil Remediation Goals (PRGs) (mg/kg) Industrial Use SS-1 (mg/kg dry)SS-2 (mg/kg dry)SS-3(mg/kg dry)Surface Water Standards (15A NCAC 2B) (Ug/L)SWPT-2 (Ug/L)Arsenic 5.8 3 2.1 2.9 0.47 J10NDBarium 580 44000 12 15 7.2 J2000000NDBeryllium 63 460 0.26 J 0.16 J 0.074 J6.5NDCadmium 3 14.2 ND ND 0.015 J2NDChromium 360000 10000 11 162.9501.1 BCobalt 0.9 70 1.5 1.1 0.18 J2700.5 JCopper 700 9400 5 5 1.271 JLead 270 800 5.9 6.7 2.5250.65 JNickel 130 4400 4.8 5.3 1.3880.58 JSelenium 2.1 1160 1.4 0.31J 0.26 J5 0.52 JThallium 0.28 2.4 0.064 J 0.084 J 0.044 J0.47 0.54 JVanadium 6 1160 17 24 5.3NA 1.4Zinc 1200 70000 9.7 J 10 J 4.4 J50 30Acetone 24 100000 0.1 0.03 0.028NA NDMethyl Ethyl Ketone16 28400 0.0054 J 0.0013 J 0.0013 JNA NDMethyl Isobutyl Ketone0.43 3360 ND ND 0.0012 JNA NDNitrate as N 100000 100000 0.65 J 0.62 J 0.64 JNA NASulfate NA NA 7.5 J ND NDNA NAPhosphorus NA NA 69 12034NA NANOTES:J - Constituent detected but below the Reporting Limit (RL); therefore, the results is an estimated concentration.ND = Not Detected above the Laboratory Established Reporitng LimitNA = Standard Not Available for this paramterData from Prism Laboratories, Inc., Work Order No: 7090282 dated 9/25/17IHSB Prelim. Soil Remediation Goals - NCDEQ Inactive Hazardous Sites Branch Preliminary Soil Remediation Goals for protection of groundwater updated October 2016
Page 1 of 37
Page 2 of 37
Page 3 of 37
Page 4 of 37
Page 5 of 37
Page 6 of 37
Page 7 of 37
Page 8 of 37
Page 9 of 37
Page 10 of 37
Page 11 of 37
Page 12 of 37
Page 13 of 37
Page 14 of 37
Page 15 of 37
Page 16 of 37
Page 17 of 37
Page 18 of 37
Page 19 of 37
Page 20 of 37
Page 21 of 37
Page 22 of 37
Page 23 of 37
Page 24 of 37
Page 25 of 37
Page 26 of 37
Page 27 of 37
Page 28 of 37
Page 29 of 37
Page 30 of 37
Page 31 of 37
Page 32 of 37
Page 33 of 37
Page 34 of 37
Page 35 of 37
Page 36 of 37
Page 37 of 37