HomeMy WebLinkAbout4002_GreeneCounty_CDLF_GWMReport_DIN26374_20150317Greene County Active C&D over Closed Unlined Landfill
Walstonburg, North Carolina
March 2015
MESCO Project Number: G15010.0
Semi-Annual Water Quality Monitoring Report
with Corrective Action Update
Prepared for
Municipal Engineering Services Company, P.A.Garner and Boone, North Carolina
Permit Number: 40-02
P.O. Box 97
Garner, NC 27529
License No. C-0281
TABLE OF CONTENTS
SECTION
Introduction Page 1
Background Page 1
Sampling Procedures Page 2
Field Parameter Data Page 2
Laboratory Results Page 2
Quality Control Samples Page 2
Groundwater Samples Page 2
Surface Water Samples Page 3
Groundwater Characterization Page 3
Corrective Action Update Page 3
Findings Page 3
Closing Page 3
FIGURES
Topographic Map with Site Location Figure 1
Potentiometric Map of Surficial Aquifer with Detections Above 2L Standards Figure 2
Biochlor Natural Attenuation Screening Protocol Matrix (MW-4) Figure 3
Time-Series Graphs of Select Detections Figure 4
Histograms of VOC Concentrations in MW-4 Figure 5
TABLES
Groundwater Monitoring Well Construction Table Table 1
Sampling and Analysis Summary Table 2
Detections Above SWSL, GWP, 2L, or 2B (Appendix 1) Table 3
Detections Above SWSL, GWP, 2L, or 2B (Appendix II) Table 4
Hydrologic Properties at Monitoring Well Locations Table 5
MNA Parameter Data Summary Table 6
APPENDICIES
Laboratory Analysis Reports and Chains of Custody Appendix A
February 19, 2016
Ms. Jaclynne Drummond
Solid Waste Section (SWS)
NCDEQ Division of Waste Management
217 West Jones Street
Raleigh, NC 27603
Subject: Semi-Annual Water Quality Monitoring Report with Corrective Action Update
Greene County Active C&D and Closed Unlined Landfill
Event Date: March 17, 2015
Permit No. 40-02
MESCO Project No. G15010.0
Dear Ms. Drummond:
Introduction
On behalf of Greene County, Municipal Engineering Services Company, P.A. (MESCO) is pleased to present this
Semi-Annual Water Quality Report with Corrective Action Update for spring 2015 at the Active Construction and
Demolition (C&D) Landfill and Closed Unlined Sanitary Landfill. NCDEQ Solid Waste Rules 15ANCAC13B.1630
through .1637 requires that Greene County provide this report to the SWS on a semi-annual basis. This report
documents the quality of the ground and surface waters during this monitoring event performed on March 17, 2015. A
brief corrective action update and qualitative evaluation comparing current and historical data is also presented.
Constituents detected in concentrations above North Carolina Groundwater Standards (2L) were benzene and vinyl
chloride in sample MW-4 and vinyl chloride in sample MW-5.
Background
The Greene County Active Construction and Demolition (C&D) Landfill and Closed Unlined Sanitary Landfill is
located off Fire Tower Road (SR 1239), Walstonburg, Greene County, North Carolina and operates under permit #40-
02. A topographic map showing the facility location is included as Figure 1.
Prior to operating as a C&D landfill, the site operated as an approximate 13-acre unlined sanitary landfill which
stopped receiving waste prior to January 1, 1998 in accordance with the Greene County Transition Plan. The C&D
landfill is operating on a portion of the top of the MSW unit which are monitored together.
Water quality has been monitored at this facility on at least a semi-annual basis since 1994. MESCO submitted an
Assessment and Corrective Action (ACM) [DIN:8776] report dated August 30, 2007. MESCO then developed a
Corrective Action Plan (CAP) which was revised on February 12, 2010 (CAP-Rev. 5) [DIN:9670] and subsequently
approved on February 16, 2010 [DIN:671]. Groundwater remediation using monitored natural attenuation (MNA)
was initiated on March 30, 2010 and has continued on a semi-annual basis since. A Corrective Action Evaluation
Report (CAER) was submitted to the SWS on October 16, 2012 (DIN:17502) which was was reviewed by the SWS
and responded to on December 6, 2012 (DIN:17837).
As specified within rule 15A NCAC 13B.1632(i), the SWS Environmental Monitoring Report Form, and a recent
SWS memorandum this report contains sampling procedures, field and laboratory results, corrective action update,
groundwater and surface water characterization, and findings. Well construction summary table, sampling and
analysis summary table, detections compared to Standards tables, a groundwater flow directions/rates table,
potentiometric map, quality assurance/quality control data, and field/laboratory analytical data results are enclosed
herein.
Figures
Topographic Map with Site Location
FIGURE 1
Greene County Active C&D over Closed MSWLF
QUADRANGLE LEGEND
NOTE: Topographical map assembled from corresponding USGS 7.5-min. quadrangles of the subject region.
105 Landfill Road (SR1257)
Walstonburg, NC
Lat:35-31-29.7520
Long:-77-41-49.4325
Northing:648520.2533
Easting:2387660.4409
DOWNSTREAM
UPSTREAM
3,334'0
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Groundwater Levels & VOCs Detected Above 2L Standards
March 17, 2015
WELL #
15A NCAC 2L Groundwater Quality Standard 1.0 0.03
MW-1R 121.78 3.76 118.02
MW-4 117.89 9.24 108.65 3.3 8.3
MW-5 115.76 11.65 104.11 1.9
MW-6 117.41 3.71 113.70
MW-7 110.48 7.00 103.48
MW-8 111.36 4.26 107.10
PZ-2 119.59 6.98 112.61
TOP OF
CASING
ELEVATION
DEPTH
TO
WATER
GROUNDWATER
POTENTIOMETRIC
ELEVATION
BENZENE
(ug/l)
VCM
(ug/l)
MW-4
Benzene - 3.3 ug/l
Vinyl Chloride - 8.3 ug/l
MW-5
Vinyl Chloride - 1.9 ug/l
Natural Attenuation Interpretation Score
Screening Inadequate evidence for anaerobic biodegradation* of chlorinated organics 0 to 5
Protocol Limited evidence for anaerobic biodegradation* of chlorinated organics 6 to 14 Score:18
Adequate evidence for anaerobic biodegradation* of chlorinated organics 15 to 20
Strong evidence for anaerobic biodegradation* of chlorinated organics >20 Scroll to End of Table
Concentration in PointsAnalysisMost Contam. Zone Interpretation Yes No Awarded
Oxygen*<0.5 mg/L Tolerated, suppresses the reductive pathway at higher 0
concentrations
> 5mg/L Not tolerated; however, VC may be oxidized aerobically 0
Nitrate*<1 mg/L At higher concentrations may compete with reductive 2
pathway
Iron II*>1 mg/L Reductive pathway possible; VC may be oxidized under 3
Fe(III)-reducing conditions
Sulfate*<20 mg/L At higher concentrations may compete with reductive 2
pathway
Sulfide*>1 mg/L Reductive pathway possible 0
Methane*>0.5 mg/L Ultimate reductive daughter product, VC Accumulates 3
Oxidation <50 millivolts (mV)Reductive pathway possible 1
Reduction
Potential* (ORP)<-100mV Reductive pathway likely 0
pH*5 < pH < 9 Optimal range for reductive pathway 0
TOC >20 mg/L Carbon and energy source; drives dechlorination; can be 0
natural or anthropogenic
Temperature*>20oC At T >20oC biochemical process is accelerated 0
Carbon Dioxide >2x background Ultimate oxidative daughter product 1
Alkalinity >2x background Results from interaction of carbon dioxide with aquifer 1
minerals
Chloride*>2x background Daughter product of organic chlorine 0
Hydrogen >1 nM Reductive pathway possible, VC may accumulate 3
Volatile Fatty Acids >0.1 mg/L Intermediates resulting from biodegradation of aromatic 0
compounds; carbon and energy source
BTEX*>0.1 mg/L Carbon and energy source; drives dechlorination 0
PCE*Material released 0
TCE*Daughter product of PCE a/0
DCE*Daughter product of TCE.
If cis is greater than 80% of total DCE it is likely a daughter 0
product of TCEa/; 1,1-DCE can be a chem. reaction product of TCA
VC*Daughter product of DCEa/2
1,1,1- Material released 0
Trichloroethane*
DCA Daughter product of TCA under reducing conditions 0
Carbon Material released 0
Tetrachloride
Chloroethane*Daughter product of DCA or VC under reducing conditions 0
Ethene/Ethane >0.01 mg/L Daughter product of VC/ethene 0
>0.1 mg/L Daughter product of VC/ethene 0
Chloroform Daughter product of Carbon Tetrachloride 0
Dichloromethane Daughter product of Chloroform 0
* required analysis.
a/ Points awarded only if it can be shown that the compound is a daughter product
(i.e., not a constituent of the source NAPL).
End of Form
* reductive dechlorination
The following is taken from the USEPA protocol (USEPA, 1998). The results of this scoring process have no regulatory significance.
ResetSCORE
Greene County Active C&D over Closed MSWLF Page 1 of 1
Figure 4
Time-Series Graphs of Select Constituents
March 17, 2015
2L
2L
Non-Detects Represented at Detection Limit
2L
2L
Greene County Active C&D and Closed MSWLF Page 1 of 1
Figure 5
Histograms of VOC Concentrations in MW-4
(March 30, 2010-September 28, 2011) Compared to March 17, 2015
BASELINE
MARCH 2010 59.30 5.30 10.30
SEPT. 2010 17.40 2.50 4.10
MARCH 2011 17.50 3.00 5.40
SEPT. 2011 19.10 3.00 5.30
BASELINE AVERAGE 28.33 3.45 6.28
CURRENT
MARCH 2015 14.80 3.30 8.30
COMPARISON BENZENE
-13.53 -0.15 2.03
DIFFERENCE (%)-47 -4 +32
TOTAL
VOCS
(ug/l)
BENZENE
(ug/l)
VINYL
CHLORIDE
(ug/l)
TOTAL
VOCS
(ug/l)
BENZENE
(ug/l)
VINYL
CHLORIDE
(ug/l)
TOTAL
VOCS
VINYL
CHLORIDE
DIFFERENCE (ug/l)
TOTAL VOCS BENZENE VINYL CHLORIDE
0
2.5
5
7.5
10
12.5
15
17.5
20
22.5
25
27.5
30
VOC(s)BASELINE AVERAGES COMPARED TO MARCH 2015
in MW-4
BASELINE AVERAGE
MARCH 2015
ug
/L
Tables
Greene County Active C&D and Closed MSWLF Page 1 of 1
Table 1
Groundwater Monitoring Well Construction Table
March 17, 2015
Latitude Longitude
(inches) (ft)
MW-1R 11/19/1981 2 18.20 3.20 15 Soil 121.78 119.79 118.02 3.76 35.525139 -77.695158
MW-4 8/26/1994 2 24.10 9.10 15 Soil 117.89 115.14 108.65 9.24 35.526914 -77.692369
MW-5 8/26/1994 2 29.00 14.00 15 Soil 115.76 113.16 104.11 11.65 35.526133 -77.692242
MW-6 8/28/1994 2 28.80 13.80 15 Soil 117.41 114.54 113.70 3.71 35.525008 -77.692431
MW-7 8/29/1994 2 18.50 6.50 12 Soil 110.48 107.75 103.48 7.00 35.526639 -77.691833
MW-8 6/21/2007 2 17.98 6.98 11 Soil 111.36 108.71 107.10 4.26 35.527039 -77.691842
PZ-2 11/19/1981 2 20.00 10.00 10 Soil 119.59 116.58 112.61 6.98 35.527278 -77.696911
NOTE:
bgs = below ground surface
amsl= above mean sea level
btoc = below top casing (PVC well casing)
Monitoring Well Date Installed
Well
Diameter
Total Well
Depth
Top of Screen
Depth
Screen
Length Geology of Screened Interval
Top of Casing
Elevation
Ground
Elevation
Groundwater
Elevation
Depth to
Water
(ft bgs)(ft bgs)(ft amsl) (ft amsl)(ft amsl)(ft btoc)
Greene County Active C&D over Closed MSWLF Page 1 of 1
Table 2
Sampling and Analysis Summary
March 17, 2015
MNA Field Parameter
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MW-1R x x x x x x x x x x x x x x x x x x x x x x x
MW-4 x x x x x x x x x x x x x x x x x x x x x x x
MW-5 x x x x x x x x x
MW-6 x x x x x x x x x
MW-7 x x x x x x x x x
MW-8 x x x x x x x x x
Downstream x x x x x x x x x
Upstream x x x x x x x x x
EB x x
TB x x
FB x x
App. I App. II
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App I & II = Appendix Lists from current 40 CFR 258
Greene County Active C&D over Closed MSWLF Page 1 of 1
Table 3
Detections in Water Samples Above SWSL, GWP, 2L, or 2B (Appendix I)
March 17, 2015
Sample ID Result Unit
MW-1R Barium, total 3/17/15 223 0.12 100 700 1300
MW-1R Barium, Total Dissolved 3/17/15 211 0.06 100 700 1300
MW-4 Vinyl Chloride 3/17/15 8.3 0.63 1 0.03 5 L &/or LFG
MW-4 Benzene 3/17/15 3.3 0.24 1 1 5 L &/or LFG
MW-4 3/17/15 2.1 0.39 1 6 75
MW-4 3/17/15 1.1 0.21 1 550 700
MW-5 Vinyl Chloride 3/17/15 1.9 0.63 1 0.03 5 L &/or LFG
Upstream Zinc, Total Dissolved 3/17/15 12 0.47 10 50 5000
Upstream Zinc, total 3/17/15 14 0.53 10 50 5000
A definitive source of the detection was not determined as part of this report.
j =The reported value is between the laboratory method detection limit (MDL) and the laboratory method reporting limit (MRL),
adjusted for actual sample preparation data and moisture content, where applicable
L = Leachate
LFG = Landfill Gas
NE = Not Established
BOLD = Concentration > 2L, 2B, GWP or MCL Standard
Parameter Name 1 Sample
Date MDL 2 SWSL 3 2L 4 2B 5 GWP 6 MCL 7 Preliminary
Cause 8
ug/l
ug/l
ug/l
ug/l
1,4-Dichlorobenzene ug/l
Ethylbenzene ug/l
ug/l
ug/l
ug/l
1 Table contains constituents detected at or above SWSL, GWP, 2L, or 2B
2 MDL = Method Detection Limit
3 SWSL = Solid Waste Section Reporting Limit
4 2L = North Carolina 15A NCAC 2L Groundwater Quality Standard
5 2B = North Carolina 15 NCAC 2B Surface Water Quality Standard for this Specific Stream Classification
6 GWP = Groundwater Protection Standard
7 MCL = Primary Drinking Water Standard (not currently applicable for regulatory comparisons)
8 Preliminary Cause = Refers to a preliminary analysis of the cause and/or source of a detection over the respective 2L/2B Standard.
Greene County Active C&D over Closed MSWLF Page 1 of 1
Table 4
Detections in Water Samples Above MDL (Appendix II Exclusive)
March 17, 2015
Sample ID Result Unit
MW-5 Tin, total 3/17/15 0.08 j 0.05 100 NE NE 2000 NE
MW-8 Tin, total 3/17/15 0.08 j 0.05 100 NE NE 2000 NE
A definitive source of the detection was not determined as part of this report.
j =The reported value is between the laboratory method detection limit (MDL) and the laboratory method reporting limit (MRL),
adjusted for actual sample preparation data and moisture content, where applicable
NE = Not Established
BOLD = Concentration > 2L, 2B, GWP or MCL Standard
Parameter Name 1 Sample
Date MDL 2 SWSL 3 2L 4 2B 5 GWP 6 MCL 7 Preliminary
Cause 8
ug/l
ug/l
1 Table contains constituents detected at or above SWSL, GWP, 2L, or 2B
2 MDL = Method Detection Limit
3 SWSL = Solid Waste Section Reporting Limit
4 2L = North Carolina 15A NCAC 2L Groundwater Quality Standard
5 2B = North Carolina 15 NCAC 2B Surface Water Quality Standard for this Specific Stream Classification
6 GWP = Groundwater Protection Standard
7 MCL = Primary Drinking Water Standard (not currently applicable for regulatory comparisons)
8 Preliminary Cause = Refers to a preliminary analysis of the cause and/or source of a detection over the respective 2L/2B Standard.
Greene County Active C&D over Closed MSWLF Page 1 of 1
Table 5
March 17, 2015
MW-1R 1.20E-04 15 0.001 1 N32E 3.76 118.02
MW-4 1.10E-04 15 0.043 33 S58E 9.24 108.65
MW-5 1.40E-04 15 0.004 4 S88E 11.65 104.11
MW-6 1.90E-04 15 0.025 33 N17E 3.71 113.7
MW-7 1.98E-04 7 0.040 117 S55E 7.00 103.48
MW-8 1.14E-03 7 0.039 659 S22E 4.26 107.1
PZ-2 0.012 N22E 6.98 112.61
Minimum 1.10E-04 7 0.001 1 -3.71 103.48
Average 3.16E-04 12 0.025 141 -6.66 109.67
Maximum 1.14E-03 15 0.043 659 -11.65 118.02
NOTE:
Data for hydraulic conductivities for MW-7 & MW-8 obtained from slug tests performed by MESCO (June, 2007)
where
Hydrologic Properties at Monitoring Well Locations
Monitoring
Well
Hydraulic
Conductivity
(cm/sec)
Effective
Porosity (%)
Hydraulic
Gradient
(ft/ft)
Linear Velocity
(ft/yr)
Flow
Direction
Depth to
Groundwater
(ft btoc)
Groundwater
Potentiometric Elevation
(ft amsl)
na na na
Data for hydraulic conductivities for wells except MW-7 & MW-8 obtained from GAI Consultants' Water Quality Modifications (October, 1994)
Hydrologic gradient from water level elevations reportedly taken on March 17, 2015
Flow rate (Q) is defined by modified Darcy's equation:
K= hydraulic conductivity
ne = effective porosity
dh= head difference
dl= horizontal distance
Q=−K
ne
⋅dh
dl
Greene County Active C&D over Closed MSWLF Page 1 of 1
Table 6
MNA Parameters at Monitoring Well Locations Summary
March 17, 2015
Parameters Method Units MW-1R MW-4
03/17/15 03/17/15
VFA – Acetic Acid AM23G 2 21j 23j
AM23G 1 3.5j 2.5j
AM23G 8 <8 <8
AM23G 8 <8 <8
AM23G 3 <3 <3
VFA – Lactic Acid AM23G 2 10j 5.5j
AM23G 4 <4 <4
AM23G 1 1.6j 1.1j
AM23G 2 <2 <2
Hydrogen AM20GAX 0.13 1 1.1
Methane AM20GAX 0.01 0.08 2900
AM20GAX 0.01 0.0015 0.039
Ethane AM20GAX 0.001 0.0015j 0.001
CO2-Dissolved 4500CO2C 1000 55000 578000
Alkalinity 2320B-97 1000 2000 224000
Sulfate 4500SO42E97 5000 <5000 23400j
Sulfide 4500S2D-00 100 <100 <100
Chloride 4500CLB-97 5000 191000 18000
TOC 5310C-00 46 <46 8940
COD H8000-79 20000 <20000 31000
BOD 5210B-01 2000 <2000 <2000
Iron, Total 3111B-99 16 118j 97750
Iron, Ferrous 3500FEB-97 50 <50 91340
Nitrate 353.2 R2-93 40 2600j <40
Temperature 2550B-00 0.01 C 12 13
ORP 2580B 0 218 -19
DO 4500OG-01 0.1 mg/l 2.92 1.26
pH 4500HB-00 0 SU 5.1 5.8
Specific Conductance 2510B-97 1 758 510
Turbidity 2130B-01 1 NTU 1.14 1.14
Notes:
VFA = Volatile Fatty Acids
mdl*
ug/l
VFA – Butyric Acid ug/l
VFA – Hexanoic Acid ug/l
VFA – i-Hexanoic Acid ug/l
VFA – i-Pentanoic Acid ug/l
ug/l
VFA – Pentaonic Acid ug/l
VFA – Propionic Acid ug/l
VFA – Pyruvic Acid ug/l
nM
ug/l
Ethene ug/l
ug/l
ug/l
ug/l
ug/l
ug/l
ug/l
ug/l
ug/l
ug/l
ug/l
ug/l
ug/l
mV
Umhos/cm
mdl* = Lowest Method Detection Limit for Lab Parameters or Lowest Field Measurement Possible
j = Estimated concentration greater than the set mehod detection limit (MDL) and less then the set reporting limit (PQL).
Appendix A
Laboratory Analysis Report
Field Analysis Report
Chains of Custody