HomeMy WebLinkAbout4002_GreeneCounty_GWMR_DIN28121_20160303Greene County Active C&D over Closed Unlined Landfill
Walstonburg, North Carolina
March 2016
MESCO Project Number: G16010.0
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 4
Closing Page 4
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
Bioscreen Model for Benzene Data Input Sheet (Source to MW-4 to MW-7 to Compliance Line)Figure 4
Bioscreen Model for Benzene (Current 2016) Figure 5
Bioscreen Model for Benzene (Predicted 3016) Figure 6
Bioscreen Model for Benzene (Predicted 2032) Figure 7
Time-Series Graphs of Select Detections Figure 8
Histograms of VOC Concentrations in MW-4 Figure 9
TABLES
Groundwater Monitoring Well Construction Table Table 1
Sampling and Analysis Summary Table 2
Detections Above SWSL, GWP, 2L, 2B, GWP or MCL (Appendix 1) Table 3
Detections Above MDL (Appendix II) Table 4
Hydrologic Properties at Monitoring Well Locations Table 5
MNA Parameter Data Summary Table 6
APPENDIX
Laboratory Analysis Reports, Field Parameter Data and Chains of Custody Appendix A
October 28, 2016
Ms. Jaclynne Drummond
Solid Waste Section (SWS)
NC Department of Environmental Quality (NCDEQ)
2090 US Highway 70
Swannanoa, NC 28778
Subject: Semi-Annual Water Quality Monitoring Report with Corrective Action Update
Greene County Active C&D and Closed Unlined Landfill
MESCO Project No. G16010.0
Permit No. 40-02
Event Date: March 3, 2016
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 2016 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 3, 2016. 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 which are both located within the compliance boundary.
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 ever since. A Corrective Action Evaluation
Report (CAER) was submitted to the SWS on October 16, 2012 (DIN:17502) which 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 SWS
memorandums 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, natural attenuation screening matrix score table, quality assurance/quality control data, and
field/laboratory analytical data results are enclosed herein.
Sampling Procedures
Environment 1 (E1) of Greenville, NC, reportedly performed this monitoring event utilizing portable monitoring
methodology in accordance with the approved Sampling & Analysis Plan (SAP) contained in the CAP-Rev.5. E1
reportedly collected groundwater samples from all locations designated in the SAP which includes five
downgradient groundwater monitoring wells (MW-4, MW-5, MW-6, MW-7 and MW-8), one background well
(MW-1R) and both surface water points (Upstream and Downstream). Quality control measures included submittal
and analysis of an equipment blank (EB), field blank (FB) and trip blank (TB). Surface water and groundwater
monitoring locations are depicted on Figure 1 and Figure 2 respectively. A summary detailing the construction of
the water monitoring wells is presented on Table 1.
Static water levels in each well were measured electronically prior to purging. Samples were transported under C-
O-C protocol and analyzed within the hold times specified for each method.
Field Parameter Data
E1 recorded the field parameters pH, specific conductance, temperature, turbidity, oxidation reduction potential
(ORP) and dissolved oxygen (DO) which are presented in the laboratory analysis report in Appendix A.
Laboratory Results
E1 performed analysis of groundwater samples for the constituents listed in Appendix I of 40 CFR 258. Both total
and dissolved metals listed in Appendix II of 40 CFR 258 were reported as requested by the SWS in the CAER
response (DIN 17837). In addition, samples from MW-4 and background well MW-1, were analyzed for the full
suite of MNA performance parameters as part of corrective action. MNA analysis was conducted for volatile fatty
acids, methane, ethane, ethene, and dissolved hydrogen by Microseeps Inc. of Pittsburgh, PA. A sampling and
analysis table summarizing the locations, constituents, and methods is presented on Table 2. Laboratory results and
C-O-Cs are contained in Appendix A.
Water samples were analyzed to the laboratory-established Method Detection Limits (MDL), which are at or below
current Solid Waste Section Limits (SWSL). Table 3 summarizes Appendix I constituents detected in groundwater
and surface water samples above the current SWSL, Groundwater Protection Standards (GWP), North Carolina
Groundwater Standards (2L), the applicable Class C North Carolina Surface Water Standards (2B) and Maximum
Contaminant Levels (MCL) also known as “Federal Primary Drinking Water Standards”. Table 4 summarizes the
few detections of an Appendix II exclusive metal tin (defined in this report as not also listed in Appendix I ) above
the MDL.
Quality Control Samples
Ten of the seventeen (59%) targeted total metals were detected in low non-quantifiable (“j” qualified) concentrations
in the FB. Since no metals were detected in excess of any regulatory Standard, any lab or field induced artifact
contamination is inconsequential.
2
Groundwater Samples
Metals were not detected in any sample above any applicable groundwater protection Standards.
VOCs benzene and vinyl chloride have consistently been detected in concentrations above their respective 2L
Standards in samples collected from MW-4 since the detection levels were reduced in March 2007. Vinyl chloride
was also detected in sample MW-5 and has previously been detected during the spring events of 2009, 2010, 2014,
2015.
Tin, the only Appendix II exclusive parameter, defined in this report as not also listed in Appendix I, was detected
below the SWSL and applicable regulatory compliance Standard.
A site map spatially depicting contaminants detected in excess of the 2L Standard during this event is presented on
Figure 2.
Surface Water Samples
No constituents were detected in excess of applicable 2B Standard in the surface water sample collected upstream or
downstream of the facility.
Groundwater Characterization
A single-day potentiometric map of the uppermost aquifer is presented on Figure 2, using ground water elevation
data reported by E1 for this event. Reported groundwater elevations were all within their respective historically
identified range. Groundwater flow direction and rates were calculated based on reported data and are included in
Table 5. Estimated flow flow rates during this event, quantified through modified Darcy's equation, ranged from
about 7 ft/yr (MW-4) to 431 ft/yr (MW-8) for a site-wide average of approximately 96 ft/yr.
Corrective Action Update
Semi-annual MNA monitoring of MW-4 was initiated on March 30, 2010 and has consistently been performed for
the full suite of SWS recommended parameters for 13 consecutive semi-annual events. The most recent MNA data
is presented in Table 5. The MNA data for this event at MW-4 was entered into the Biochlor natural attenuation
screening protocol matrix developed by the US Environmental Protection Agency (USEPA). The screening matrix
score for this event was 18 which is between 15-20 which the USEPA interprets as adequate evidence of anaerobic
biodegredation of chlorinated organics (Figure 3). Interpretation of geochemical data indicates that most of the
biodegredation capacity near MW-4 is due to methanogensis the final terminal electron acceptor which should
degrade the chlorinated solvents.
Benzene, a fuel hydrocarbon, may persist in groundwater with the geochemistry characteristics observed near MW-4
however; it can still biologically degrade but at a slower pace and less efficiently compared to the chlorinated
solvents. To predict the fate of benzene as detected at MW-4 along the eastern flow path through MW-7 modeling
was performed through Bioscreen which was developed by the USEPA. The model was constructed using recent
and historical field data and conservative assumptions with input data presented in Figure 4. The facility opened in
1982 and the first detection of benzene was observed 25 years later at MW-4. For modeling purposes, a
conservative assumption was made that the source was located at the downgradient edge of waste and based on field
quantified hydrogeological and conservatively estimated dispersion and absorption rates the release was assumed to
have occurred in 2000. The concentration of benzene at the source is unknown but the initial detection at MW-4
peaked at 5.8 ug/L in 2009. The model was then calibrated by manipulating the source concentration til it reached
37 ug/L which matched the measured levels at MW-4 during each of the last 7 years. The source concentration
used is conserevative since it is higher than detected in leachate samples collected from several other similar
landfills throughout NC. The model was run for periods between 16 and 1,016 years which corresponds to now and
3
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
Natural Attenuation Interpretation ScoreNatural Attenuation Interpretation Score
Screening 0t 5 Screening Inadequate evidence for anaerobic biodegradation* of chlorinated organics 0 to 5
Protocol Limited evidence for anaerobic biodegradation* of chlorinated organics 6to14 Score:18Protocol Limited evidence for anaerobic biodegradation of chlorinated organics 6 to 14 Score:18
Adequate evidence for anaerobic biodegradation* of chlorinated organics 15 to 20The following is taken from the USEPA protocol (USEPA, 1998). Th lt f thi i h l t
Strong e idence for anaerobic biodegradation* of chlorinated organics >20 Scroll to End of Table
The results of this scoring process have no regulatory significance. Strong evidence for anaerobic biodegradation* of chlorinated organics >20 Scroll to End of Table
* d ti d hl i ti
g
Concentration in Points* reductive dechlorinationCo ce a o osAnalysisMost Contam. Zone Interpretation Yes No Awardedyp
Oxygen*<05mg/L Tolerated suppresses the reductive pathway at higher 0Oxygen<0.5 mg/L Tolerated, suppresses the reductive pathway at higher 0
concentrationsconcentrations
>5mg/L Not tolerated; however VC may be oxidized aerobically 0> 5mg/L Not tolerated; however, VC may be oxidized aerobically 0
Nitrate*<1 mg/L At higher concentrations may compete with reductive 2
pathwaypy
Iron II*>1 mg/L Reductive pathway possible; VC may be oxidized under 3og/educt e pat ay poss b e; C ay be o d ed u de 3
Fe(III)-reducing conditionsFe(III) reducing conditions
Sulfate*<20 mg/L At higher concentrations may compete with reductive 2Sulfate<20 mg/L At higher concentrations may compete with reductive 2
pathwaypathway
Slfid*>1 /L R d ti th ibl 0Sulfide*>1 mg/L Reductive pathway possible 0
Methane*>0.5 mg/L Ultimate reductive daughter product, VC Accumulates 3ggp ,
Oxidation <50 millivolts (mV)Reductive pathway possible 1Oxidation<50 millivolts (mV)Reductive pathway possible 1
ReductionReduction
Potential* (ORP)< 100mV Reductive pathway likely 0Potential* (ORP)<-100mV Reductive pathway likely 0
H*H9 Oi l f d i h 0pH*5 < pH < 9 Optimal range for reductive pathway 0
TOC >20 mg/L Carbon and energy source; drives dechlorination; can be 0ggy ; ;
natural or anthropogenicnatural or anthropogenic
Temperature*>20oC AtT>20oC biochemical process is accelerated 0Temperature>20 C At T >20 C biochemical process is accelerated 0
Cb Diid >2 b k d Ulti t id ti d ht d t 1Carbon 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 0Chloride2x background Daughter product of organic chlorine 0
Hydrogen >1 nM Reductive pathway possible VC may accumulate 3Hydrogen>1 nM Reductive pathway possible, VC may accumulate 3
V l til F tt A id >0 1 /L I t di t lti f bi d d ti f ti 0Volatile 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 0PCEMaterial released 0
TCE*Daughter product of PCE
a/0TCE*Daughter product of PCE 0
DCE*Daughter product of TCE.
If cis is greater than 80% of total DCE it is likely a daughter 0
product of TCE
a/; 1,1-DCE can be a chem. reaction product of TCAproduct of TCE ;1,1 DCE can be a chem. reaction product of TCA
VC*Daughter product of DCE
a/2VCDaughter product of DCE 2
111 Mt il l d 01,1,1- Material released 0
Trichloroethane*
DCA Daughter product of TCA under reducing conditions 0
Carbon Material released 0CarbonMaterial released 0
TetrachlorideTetrachloride
Chloroethane*Daughter product of DCA or VC under reducing conditions 0ChloroethaneDaughter product of DCA or VC under reducing conditions 0
Eth /Eth 001 /L Dht dtfVC/th 0Ethene/Ethane >0.01 mg/L Daughter product of VC/ethene 0
>0.1 mg/L Daughter product of VC/ethene 0gg
Chloroform Daughter product of Carbon Tetrachloride 0ChloroformDaughter product of Carbon Tetrachloride 0
Dichloromethane Daughter product of Chloroform 0DichloromethaneDaughter product of Chloroform 0
*idli* 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 FormEnd of Form
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Greene County Active C&D over Closed MSWLF Page 1 of 1
Figure 8
Time-Series Graphs of Select Constituents
Current as of March 3, 2016 Event
Non-Detects Represented at Detection Limit. Reduction of detection limits exposed constituents.
2L
2L
2L
Greene County Active C&D and Closed MSWLF Page 1 of 1
Figure 9
Histograms of VOC Concentrations in MW-4
(March 30, 2010-September 28, 2011) Compared to March 3, 2016
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 2016 12.00 3.40 5.20
COMPARISON BENZENE
-16.33 -0.05 -1.08
DIFFERENCE (%)-58 -1 -17
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 2016
in MW-4
BASELINE AVERAGE
MARCH 2016
ug
/L
Tables
Greene County Active C&D and Closed MSWLF Page 1 of 1
Table 1
Groundwater Monitoring Well Construction Table
March 3, 2016
Latitude Longitude
(inches) (ft)
MW-1R 11/19/1981 2 18.20 3.20 15 Soil 121.78 119.79 117.16 4.62 35.525139 -77.695158
MW-4 8/26/1994 2 24.10 9.10 15 Soil 117.89 115.14 107.56 10.33 35.526914 -77.692369
MW-5 8/26/1994 2 29.00 14.00 15 Soil 115.76 113.16 103.97 11.79 35.526133 -77.692242
MW-6 8/28/1994 2 28.80 13.80 15 Soil 117.41 114.54 113.07 4.34 35.525008 -77.692431
MW-7 8/29/1994 2 18.50 6.50 12 Soil 110.48 107.75 103.14 7.34 35.526639 -77.691833
MW-8 6/21/2007 2 17.98 6.98 11 Soil 111.36 108.71 106.55 4.81 35.527039 -77.691842
PZ-2 11/19/1981 2 20.00 10.00 10 Soil 119.59 116.58 112.10 7.49 35.527278 -77.696911
NOTE:
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)
bgs = below ground surface
amsl= above mean sea level
btoc = below top casing (PVC well casing)
Greene County Active C&D over Closed MSWLF Page 1 of 1
Table 2
Sampling and Analysis Summary
March 3, 2016
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 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 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
Upstream x x x x x x x x
EB x x
TB x x
FB x x
App. I App. II
VO
C
s
Me
t
h
an
e/
E
t
h
e
ne
/E
t
h an
e
La
b
SM
2
3
2
0B
L ab
31
1
1
B-
99
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, 2L, 2B, GWP, or MCL (Appendix I)
March 3, 2016
Sample ID Result Unit
MW-1R Barium, total 3/3/16 141 0.02 100 700 2000
MW-1R Barium, dissolved 3/3/16 132 0.06 100 700 2000
MW-4 Benzene 3/3/16 3.4 0.24 1 1 5
MW-4 3/3/16 1.1 0.21 1 550 70
MW-4 Vinyl Chloride 3/3/16 5.2 0.63 1 0.03 NE 2
MW-4 3/3/16 2.3 0.39 1 6 75
MW-5 Vinyl Chloride 3/3/16 1.4 0.63 1 0.03 NE 2
DOWNSTREAM Zinc, total 3/3/16 10 1.61 10 50 NE
A definitive source of the detection was not determined as part of this report.
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 L &.or LFG
Ethylbenzene ug/L
ug/L L &.or LFG
1,4-Dichlorobenzene ug/L
ug/L L &.or LFG
ug/L
1 Table contains constituents detected at or above SWSL, 2L, 2B, GWP or MCL
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.
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Table 4
Detections in Water Samples Above MDL (Appendix II Exclusive)
March 3, 2016
Sample ID Result Unit
MW-1R Tin, total 3/3/16 10.4J 0.06 100 NE 2000 NE
MW-4 Tin, dissolved 3/3/16 0.1J 0.06 100 NE 2000 NE
MW-5 Tin, total 3/3/16 0.24J 0.06 100 NE 2000 NE
MW-5 Tin, dissolved 3/3/16 0.09J 0.06 100 NE 2000 NE
MW-7 Tin, dissolved 3/3/16 0.3J 0.06 100 NE 2000 NE
MW-8 Tin, total 3/3/16 0.24J 0.06 100 NE 2000 NE
UPSTREAM Tin, dissolved 3/3/16 0.15J 0.06 100 NE NE
DOWNSTREAM Tin, dissolved 3/3/16 0.11J 0.06 100 NE NE
FB Tin, total 3/3/16 0.33J 0.06 100 NE 2000 NE
EB Tin, total 3/3/16 0.49J 0.06 100 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
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
1 Table contains constituents listed in 40 CFR Appendix II but not on Appendix I that were detected at or above MDL
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.
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Table 5
March 3, 2016
MW-1R 1.20E-04 15 0.010 8 N32E 4.62 117.16
MW-4 1.10E-04 15 0.009 7 S51E 10.33 107.56
MW-5 1.40E-04 15 0.015 14 N75E 11.79 103.97
MW-6 1.90E-04 15 0.025 32 N42E 4.34 113.07
MW-7 1.98E-04 7 0.029 85 S47E 7.34 103.14
MW-8 1.14E-03 7 0.026 431 S12E 4.81 106.55
PZ-2 0.011 N39E 7.49 112.10
Minimum 1.10E-04 7 0.009 7 -4.34 103.14
Average 3.16E-04 12 0.019 96 -7.25 109.08
Maximum 1.14E-03 15 0.029 431 -11.79 117.16
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 3, 2016.
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
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Table 6
MNA Parameters at Monitoring Well Locations Summary
March 3, 2016
Parameters Method Units MW-1R MW-4
03/03/16 03/03/16
VFA – Acetic Acid AM23G 6 34j 66j
AM23G 5 9.1j 8.1j
AM23G 10 <10 <10
AM23G 10 <10 <10
AM23G 12 <12 <12
VFA – Lactic Acid AM23G 3 35j <3
AM23G 6 <6 <6
AM23G 1 3.4j 2.7j
AM23G 12 <12 <12
Hydrogen AM20GAX 0.09 1.7 2.2
Methane AM20GAX 0.01 0.026j 8600
AM20GAX 0 0.0054j 0.2
Ethane AM20GAX 0 0.0016j 0.05
CO2-Dissolved 4500CO2C 1000 68000 426000
Alkalinity 2320B-97 1000 8000 94000
Sulfate 4500SO42E97 5000 10000j 25800j
Sulfide 4500S2D-00 100 <100 <100
Chloride 4500CLB-97 5000 142000 14000
TOC 5310C-00 85 <85 6150
COD H8000-79 20000 <20000 32000
BOD 5210B-01 2000 <2000 <2000
Iron, Total 3111B-99 5.23 139j 87927
Iron, Ferrous 3500FEB-97 50 <50 78580
Nitrate 353.2 R2-93 40 2930j <40
Temperature 2550B-00 0 C 10 13
ORP 2580B 0 123 37
DO 4500OG-01 100 1620 1170
pH 4500HB-00 0.1 Units 4.9 5.8
Specific Conductance 2510B-97 1 565 418
Turbidity 2130B-01 1 NTU 9.41 4.44
Notes:
VFA = Volatile Fatty Acids
j = Estimated concentration greater than the set method detection limit (MDL) and less then the set reporting limit (PQL).
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
ug/l
ug/l
uMhos/cm
mdl* = Lowest Method Detection Limit for Lab Parameters or Lowest Field Measurement Possible
Appendix A
Laboratory Analysis Report
Field Analysis Report
Chains of Custody
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