DSHW-2018-004113 - 0901a06880813c52

Sincerely,
/-814L9—
L. Chase Forte
Senior Remediation Proj ect Manager
Georgia-Pacific LLC
Georgia-Pacific Georgia-Pacific LLC
133 Peachtree Street NE (30303-1847)
P.O. Box 105605 Atlanta, Georgia 30348-5605
[phone]
[phone] fax
April 13, 2018
Helge Gabert
Utah Department of Environmental Quality
Division of Waste Management and Radiation Control
195 North 1950 West
Salt Lake City, UT 84116
Subject: GP Gypsum 2017 Groundwater Monitoring Report
Georgia-Pacific Fomier Gypsum Manufacturing Facility
200 South State Street (Utah Highway 24)
Sigurd, UT
Dear. Mr. Gab ert:
Div of Waste Managerrent
and Radiation Conttoi
IvIAY - 8 2018
"171-1W -20/?-00t)15
Please find enclosed the 2017 Groundwater Monitoring Report for activities conducted last year at the
Georgia-Pacific Former Gypsum Manufacturing Facility in Sigurd, UT. The monitoring activities were
conducted in October of 2017 in accordance with the approved path forward outlined in the
Groundwater Quality Evaluation Update and Source-Area Investigation/Excavation Completion
Report completed by Tetra Tech, and as discussed in a meeting between Tetra Tech and Georgia-Pacific
on June 1, 2017. The work was performed by Tetra Tech on behalf of Georgia-Pacific.
We look forward to discussing with you the 2017 monitoring results and Georgia-Pacific's path forward
for the site.
If you have any questions regarding the final report or our future plans for the site, please feel free to
call me at [phone] to discuss.
Attachments: 2017 Groundwater Monitoring Report
CC: Mike Egan, Tetra Tech
Greg Council, Tetra Tech
Div of Waste Management
and Radiation Control
MAY - 8 2O18
MAW-200-004-1 /3
20 I 7 Groundwater Monitoring
Report
Georgia-Pacific Former Gypsum Manufacturing Facility
Sigurd, Utah
April 13, 2018
TETRA TECH
4750 West 2100 South, Suite 400, Salt Lake Oty, UT 84120
Tel [phone] Fax [phone] www.tatratech.corn
2017 Groundwater Monitoring Report
Georgia-Pacific Former Gypsum Manufacturing Facility
REVISION HISTORY
Vers Date Description
ion
1 January 5, 2018 DRAFT
2 February 2, 2018 DRAFT Revision
3 February 26, 2018 DRAFT Final
4 April 13, 2018 Final
April 13, 2018 TETRA TECH ii
III
2017 Groundwater Monitoring Report
Georgia-Pacific Former Gypsum Manufacturing Facility
III
TABLE OF CONTENTS
I 1 introduction 1

1.1 Description of Work 1
1.2
I
Site Background 2
1.3 Physical Setting and Site Geology 3

1.4 Site Hydrogeology 3

1.5 Contaminant Sources. 3

I 1.6 Potential Exposure Pathways 4
2 Groundwater Sampling and Analysis 5

2.1 Methodology 6
I
2.2 Results 5

2.3 Statistical Evaluation 6

2.4 Conclusions 7
I 3 Proposed Path Forward a

3.1 Monitored Natural Attenuation of Diesel-Related Groundwater Impacts 8

3.2 Institutional Control 8
I 4 References 9
111
II
III
Il
111
i
II
Il
II
111 April 13, 2018 TETRA TECH
i
2017 Gra.ndwater Monitoring Report
Georgia-Pacific Former Gypsum Manufactunng Facility
FIGURES
Figure 1. Site Location Map
Figure 2. GP Gypsum Facility Site Layout
APPENDICES
Appendix A. Analytical Laboratory Report
Appendix B. Historical Measured Groundwater Concentrations
Appendix C. Theil-Sen Trend Analyses
Appendix D. Predictive Theil-Sen Trend Analysis for Naphthalene at MW-7
April 13, 2018 TETRA TECH iv
2017 Grouldwater Monitoring Report
Georgia-Pacific Former Gypsum Manufacturing Facility
ACRONYMS AND ABBREVIATIONS
AST aboveground storage tank
bgs below ground surface
BTEX benzene, toluene, ethylbenzene, and xylenes
°C degrees celsius
COPC constituent of potential concern
DERR Department of Environmental Response and Remediation
DWMRC Division of Waste Management & Radiation Control
EPA United States Environmental Protection Agency
GP Georgia-Pacific
GWQS Ground Water Quality Standards
HASP health and safety plan
LNAPL light non-aqueous phase liquid
mg/L milligrams per liter
mV millivolts
NTU nephelometric turbidity unit
SL Screening Level
UDEQ Utah Department of Environmental Quality
pg/I microgram per liter
tiS/cm micro Siemens per centimeter
UST underground storage tank
VOC volatile organic compound
April 13, 2018 TETRA TECH
2017 Grandwater Monitoring Report
Georgia-Pacific Former Gypsum Manufactunng Facility
1 INTRODUCTION
This report summarizes the results of the groundwater samphng conducted on October 26,
2017 by Tetra Tech, Inc. (Tetra Tech) at the former Georgia-Pacific (GP) Gypsum
manufacturing facility located at 200 South State Street in Sigurd, Utah (Site). Figure 1
presents the location of the Site and Figure 2 presents a general layout of the facility.
A hydraulic fluid leak occurred within the former manufacturing building in 2005-2006 due to
the failure of the hydraulic-lift oil containment sump (Figure 2). Tetra Tech conducted a
Phase I subsurface investigation in June 2011 and a Phase II in December 2012, which
identified petroleum hydrocarbon impacts exceeding Utah Initial Screening Levels (ISLs) near
the hydraulic-oil release location and northeast of that location. Some of the impacts are likely
related to past releases of diesel fuel.
The Site is identified by the Utah Department of Environmental Quality (UDEQ), Division of
Environmental Response and Remediation (DERR) as Facility 2000058. Two state-identified
petroleum hydrocarbon releases are associated with this site, with Release IDs HPR and MTX.
Release HPR was opened in 1992 during the removal of petroleum storage tanks (USTs) from
the property and was dosed on November 1, 1996 with no further action required, following
remediation of excavated soil. The hydraulic fluid release is Release MTX. This release was
opened on May 17, 2011. The site is currently being regulated by the UDEQ Division of Waste
management & Radiation Control (DWMRC).
Following source investigation and removal activities in 2017, and demonstration that
environmental exposure risks are not significant, GP and UDEQ agreed on a path forward for
the site including additional monitoring for regulated volatile organic compounds (VOCs) and
trend analyses using the VOC data (Tetra Tech 2017). These activities are documented in
this report.
1.1 Description of Work
The 2017 groundwater monitoring approach induded the following tasks:
1. Task 1 — Field Preparation & Health and Safety Plan (HASP) Update:
a. Prepare for monitoring event by arranging for supplies, coordinating access, and
reviewing/updating HASP.
2. Task 2 — Groundwater Monitoring & Bail-Down Test:
a. Measure water levels at all accessible monitoring twits and collect samples at the
following wells: MW-4, MW 5, MW-6, MW-7, MW-9, MW-12, MW-13, MW-14, MW-15,
and MW 17.
b. Conduct laboratory analyses for site-specific volatile organic carbons (benzene,
toluene, ethylbenzene, xylenes, and naphthalene) by EPA Method 8260, using Test
America Laboratory.
c. Perform bail-down test on the groundwater well (MW-18) installed in the backfilled
hydraulic sump excavation to confirm non-recoverability of light non-aqueous phase
liquid (LNAPL).
3. Task 3 — Reporting:
a. Prepare a groundwater monitoring report including the lab report, figures, and
sampling logs, including a statistical evaluation of the groundwater sampling results
following the 2009 EPA Unified Guidance found in Chapter 21.3.
April 13, 2018 TETRA TECH 1
2017 Groundwater Monitoring Report
Georgia-Pacific Former Gypsum Manufacturing Facility
1.2 Site Background
The gypsum facility was reportedly constructed in 1947 (Natresco & Associates 2006). The
gypsum processing plant (mill) and wallboard manufacturing ceased operations in 2008. All
structures associated with the facility were demolished in 2017. Future use of the Site is being
evaluated by GP.
Five underground storage tanks (USTs) and two above-ground storage tanks (ASTs)
(Figure 2) were removed from the Site between 1988 and 1992. Petroleum impacted soils
discovered during UST removals were reported to the State and the petroleum hydrocarbon
release was assigned DERR Release Code HPR. The impacted soils were land-farmed on-
Site within a 200-foot by 150-foot constructed pad on top of the former gypsum recycle board
storage area, located southeast of the mill building. A liner was installed and a berm was built
around the pad. Soil was placed in the cell and spread to a thickness of approximately 2.5 feet.
The soils were treated with a bioremediation additive, fertilizer was added, and the soils were
tilled periodically. DERR issued a no further action letter dated November 1, 1996, and
Release HPR was closed.
Following a 2005-2006 release of hydraulic oil at the site a limited subsurface assessment was
performed (Natresco & Associates 2006). Five borings were advanced; three located within
the lift pit and two located approximately 50 and 200 feet from the lift pit. Hydraulic oil was
observed in the soil column above groundwater within the three borings advanced in the lift
pit. In one of those borings, phase-separated oil was observed at the water table. A
hydrocarbon odor was reported in the boring located approximately 50 feet northwest of the
rift pit, but no hydrocarbon odor was identified in the boring located approximately 200 feet
northwest of the lift pit. Subsequently, a site history review, regulatory review, and site visit
was performed (AMEC 2010).
Tetra Tech performed a Phase I subsurface investigation in May 2011, which included
advancing twenty-two (22) soil borings to depths of between 20 and 35 feet below ground
surface (bgs), installation of five groundwater monitoring wells, collection of soil and
groundwater samples, and laboratory analyses for presence of petroleum hydrocarbon and
related constituents (Tetra Tech 2011). A survey of the Site was also conducted to accurately
map borings and monitoring wells relative to existing facility structures and property
boundaries. DERR Release Code MTX was assigned for this site based on the initial report of
petroleum impacts discussed in the Phase I report The release was opened on May 17, 2011,
although the hydraulic oil leak had previously been verbally reported as a suspected release
to UDEQ on July 27, 2006.
Tetra Tech performed a Phase II subsurface inveštigation in December 2012, which included
advancing twenty-one (21) soil borings to depths ranging from 25 to 50 feet bgs, installation of
ten (10) groundwater monitoring wells, collection of groundwater and soil samples, and
laboratory analysis for presence of petroleum hydrocarbons and other constituents (Tetra Tech
2013). A survey was also included in the Phase II investigation to accurately map new borings
and monitoring wells relative to existing facility structures and property boundaries and to
accurately determine groundwater levels. Tetra Tech also conducted four additional rounds
of groundwater sampling: two in 2014 (Tetra Tech 2015), one in 2015 (Tetra Tech 2016), and
one in 2016 (Tetra Tech 2017).
In coordination with site demolition activities, a source-area investigation and removal at the
hydraulic-oil release location was performed in accordance with a UDEQ-approved work plan
(Tetra Tech 2017). Excavation at the hydraulic lift pit was conducted on March 6, 2017. During
April 13, 2018 TETRA TECH 2
2017 Grouldwater Monitoring Report
Georgia-Pacific Former Gypsum Manufacturing Facility
backfill, an observation well was installed in the excavation for potential confirmation that any
residual LNAPL was not recoverable.
1.3 Physical Setting and Site Geology
The Site is situated on the foothills of the Sevier Plateau at an approximate elevation of 5,200
feet above sea level. Before the first quarter of 2017, when site demolition was completed,
the facility included an approximately 100,000 square-foot building for gypsum processing and
wallboard manufacturing, employee change rooms, and a separate office. A gypsum recycle
pile is located east of the mill building.
The Site is located within the Colorado Plateau physiographic province on the east side of the
Sevier River valley, with surface geology mapped as Quaternary alluvium and colluvirin
sediments. Immediately east of the facility are outcrops of late Oligocene to middle Miocene
volcanic rocks consisting of ash flow tuffs. Further east and adjacent to the volcanic ash flow
tuffs are middle Jurassic mudstones. Based on the Phase I and Phase 11 subsurface
investigations conducted by Tetra Tech, subsurface soils generally consist of an upper sandy
silt in the eastern half of the Site and an upper silty/gravelly sand fill in the western half of the
Site underlain by interbedded and alternating beds of silty sand, sandy silt , and gravelly sand.
The northern end of the Site consists of overbank deposits of clayey silt with interbedded silty
gravel.
The Sevier River is located approximately 400 feet north of the northern Site boundary. The
Sevier River flows from west to east at this location and flows toward the north-northeast
regionally. The current land use adjacent to the Site is Highway 24 and residential property to
the west, commercial property to the north, and undeveloped land to the south and east

1.4 Site Hydrogeol ogy
Groundwater flow at the Site is generally toward the north. Groundwater has typically been
encountered in coarser grained deposits: well sorted sand and silty gravel. Groundwater below
the mill and manufacturing plant was encountered approximately 22 to 26 feet bgs during the
2017 groundwater monitoring events. West of the manufacturing plant, groundwater was
encountered approximately 22 to 30 feet bgs. North of the manufacturing plant, groundwater
was encountered approximately 12 to 20 feet bgs. The natural discharge point for Site
groundwater is the Sevier River.

1.5 Contaminant Sources
Potential contaminant sources that have been identified at the Site include: (1) hydraulic oil
impacted soil, including adsorbed and ptiase-separated fractions, surrounding the hydraulic lift
in the main manufacturing building; and (2) former 10,000 gallon ASTs located east of the main
manufacturing building that have been removed.
The hydraulic oil release resulted from leaks in the subsurface concrete hydraulic lift sump that
acted as a reservoir for oil from the hydraulic lift cylinders. The hydraulic lift was a component
of the wallboard manufacturing system. The original hydraulic lift system at the facility was
repaired in 2005 and this repair included removing and repacking the hydraulic cylinders. From
September 2005 through July 2006, the GP staff documented a loss of approximately 1,800
gallons of hydraulic fluid. At that time, the old lift equipment was removed, the sump was
cleaned, and a new lift, pump, and oil tank were installed. In 2017, soil in this area was
excavated (Tetra Tech 2017).
April 13, 2018 TETRA TECH 3
2017 Groundwater Monitoring Report
Georgia-Pacific Former Gypsum Manufacturing Facility
The 10,000 gallon ASTs east of the mill building were a probable contaminant source prior to
their removal in approximately 1989. The soils in this area have been remediated to remove
residual source material. The potential residual impacts from the former 10,000 gallon ASTs
were discovered during the Phase l investigation conducted by Tetra Tech in 2011. The
investigation identified petroleum hydrocarbon impacts with a pattern consistent with diesel
fuel east of the mill building and extending north of the crusher building.
1.6 Potential Exposure Pathways
Potential transport mechanisms include downward vertical migration of phase-separated
hydraulic oil or leached dissolved fraction hydraulic oil or diesel to groundwater with
subsequent lateral migration as dissolved and phase-separated product within or just above
shallow groundwater. Based on previous laboratory results indicating very low to non-detected
VOCs, contaminant transport by volatilization and either atmospheric dispersion or enclosed
space accumulation is expected to be minor at points of potential exposure. Based on data
collected to date, no transport mechanisms are believed to have brought contaminants into
contact with surface media away from source areas (including surface soils, surface water, or
stream sediments).
April 13, 2018 TETRA TECH 4
2017 Grouridwater Monitoring Report
Georgia-Pacific Former Gypsum Manufactunng Facility
2 GROUNDWATER SAMPLING AND ANALYSIS
An additional round of groundwater samples was collected in October 2017 and analyzed for
Site VOCs. This section describes the methodology, results, and conclusions of that sampling
event
2.1 Methodology
All sampling conducted during the 2017 groundwater monitoring event was conducted in
accordance with the approved Sampling and Analysis Plan and Quality Assurance and Control
Plan (Tetra Tech 2012) and for the wells and parameters identified in the latest Groundwater
Quality Evaluation (Tetra Tech 2017). The site specific health and safety plan (HASP) was
reviewed by field personnel.
Unfiltered groundwater samples were collected from nine groundwater monitoring wells on
October 26, 2017: MW-4, MW 5, MW-6, MW-7, MW-9, MW-12, MW-13, MW-15, and MW-17.
Field parameter measurements collected included pH, temperature, specific conductance,
dissolved oxygen, oxidation reduction potential, turbidity and depth to water. Tetra Tech
attempted to locate monitoring well MW-14, but the well appeared to have been covered and/or
damaged during Site activities. MW-17 is a deeper well with a 5-foot-long screened section
45 to 50 feet bgs. The remaining wells have longer (10 to 20 ft) screens across or near the
water table (screen tops and bottoms range from 10 to 35 feet bgs).
All down-hole sampling and monitoring equipment was decontaminated prior to use at each
sampling location. Decontamination consisted of a Liquinox solution wash followed by a triple
rinse with deionized water. All field parameter monitoring equipment was field calibrated prior
to performing measurements. Each well was purged of three borehole volumes of water or
until groundwater parameters stabilized. The groundwater surface was allowed to recover to
near pre-purging conditions prior to sample collection. Sample collection was conducted
utilizing a bladder pump. When LNAPL was present in a well (MW-12), groundwater samples
were collected from below the LNAPL.
Groundwater samples were shipped with chain-of-custody documentation to TestAmerica
Laboratories, inc. in Nashville, Tennessee for analyses of Site-specific VOCs by EPA Method
8260B. The Site-specific VOCs indude benzene, toluene, ethylbenzene, and xylenes (BTEX)
plus naphthalene. These constituents are often found in petroleum releases.
Tetra Tech attempted to conduct a bail-down test on MW-18 installed in the backfilled hydraulic
sump excavation to confirm-non-Tcoverability of LNAPL, but the well was dry when measured
on October 26, 2017.
2.2 Results
Groundwater field parameters collected during the 2017 monitoring event are presented in
Table 1. Groundwater analytical laboratory results from the 2017 monitoring event are
presented in Table 2. The full laboratory report is provided in Appendix A. Appendix B
provides results from past groundwater sampling.
At MW-12, which is near the hydraulic oil release, phase-separated oil was detected at an
approximate thickness of 1.42 feet. This is consistent with past observations of LNAPL in this
1-inch diameter well. Based on prior analyses (Tetra Tech 2017), the LNAPL in the vicinity of
this well is not recoverable and the LNAPL is not a significant source of regulated constituents.
April 13, 2018 TETRA TECH 5
2017 Groundwater Monitonng Report
Georgia-Pacific Former Gypsum Manufacturing Facility
A hydrocarbon odor was noted at MW-7, although no discemable free product was measured
in the well.
Table 1. October 2017 Groundwater Field Parameters
Monitoring
Well ID
Top of Casing
Elevation
Depth to
Water (ft bgs)
Temp
(T)
„H r
SC
(pS/cm)
DO
(mg/L)
oRF,
(mV)
Turbidity
(NTU)
MW-4 5233 89 17 80 13 79 7.00 3 63 2.32 38 0 59 8
MW-5 5227.54 12 60 10 38 7 02 2 07 0.00 -175.0 33.1
MW-6 5242 26 24.69 17.15 7.67 0 72 4.52 6 0 627.0
MW-7 5235 71 20 09 16 27 7.63 1 59 0 00 -199 0 523 0
MW-9 5239 10 22 21 20 56 7.27 1.52 0 11 -105.0 294.0
MW-12 5241.92 25.90 16 60 7.77 0 65 1.25 -153 0 444.0
MW-13 5240 39 23 16 17.59 7 51 1 37 0 00 198 0 236 0
MW-15 5229 62 14 87 11.31 7.16 1.76 0 37 185 0 0 4
MW-17 5239 37 23 40 18.89 8.03 0 84 2.57 49 0 26.4
*C degrees Celsius;
pS/cm micro Siemens/centmeter;
mg/L: milligrams per liter;
mV millivolts; NTU. nephelometric tsbidity unit
Table 2. October 2017 Groundwater Sampling Results
Monitoring
Well ID
Benzene (p cll.) Toluene (pg/L) Ethylbenzene (pg/L) Xyienes, Total (pg/L) Naphthalene
(141-)
GWQS: 2.2 GWQS: 1000 GWQS: 530 GWQS: 10000 GWQS: -
MW-4 ND ND ND ND ND
MW-5 ND ND ND ND ND
MW-6 ND ND ND ND ND
MW-7 ND ND 0.504 J ND 4.41 J
MW-9 ND ND ND ND 1.01 J
MW-12 ND ND ND ND ND
MW-13 0.584 J ND 1.99 ND 1.02 J
MW-15 ND ND ND ND ND
MW-17 ND ND ND ND ND
pg/L micrograms per liter;
ND: non-detect;
GWQS Utah Grcund Water Quality Standards (R317-6-2, Utah Administrative Code)
J Estimated; detected below practical quantitation level
No VOCs were detected at levels above the Utah Ground Water Quality Standards (GWQSs;
R317-6-2, Utah Administrative Code).
Low concentrations - below the practical quantitation limit- of benzene, ethylbenzene, and
naphthalene were detected at MW-7, MW-9, and MW-13. Additionally, MW-13 (near the
presumed former diesel source) had a measured ethylbenzene concentration of 1.99 pg/L.
At MW-12 near the hYdraulic oil release, there were no detections of benzene, toluene,
ethylbenzene, xylenes, or naphthalene.
2.3 Statistical Evaluation
In accordance with discussions between UDEQ and GP on June 1, 2017, measured VOC
concentrations from 2012 through 2017 were used to perform statistical analyses. These
Theil-Sen trend analyses were performed in accordance with Section 21.3.2 of the EPA Unified
Guidance using the "R" (R Core Team, 2012) script provided by EPA (Appendix C of EPA,
2009). Appendix C presents the results of the analyses.
All VOC concentration trends that can be generated (i.e. there are enough detections) show a
declining concentration trend (Appendix C). The upper 95th percentile ("P95") concentrations
of benzene were compared to the EPA Maximum Contaminant Level (MCL). Naphthalene
April 13, 2018 TETRA TECH 6
2017 Grouldwater Monitoring Report
Georgia-Pacific Former Gypsum Manufacturing Facility
P96 concentrations were compared to the EPA residential tapwater non-cancer screening
level (SL) with a Target Hazard Index of 1 (6.1 pg/L). The P95 concentrations of ethylbenzene
were compared to EPA Ingestion Screening Levels corresponding to Total Risk (TR) values
of 1E-05 and 1E-06.
The October measured concentrations for all constituents of potential concern (COPCs) were
below their respective benchmarks (i.e. MCL, non-cancer SL, or 1E-05 TR ingestion SL). The
October 2017 P95 concentrations for five of the six analyzed trends were also below the
regulatory standards; only naphthalene at MW-7 had a P95 above the non-cancer SL.
However, the last two samples from MW-7 (collected in 2016 and 2017) both had naphthalene
concentrations below this screening level. Additionally, a predictive analysis of MW-7
naphthalene concentrations indicates that even if future concentrations are equal to the most
recent sample concentration (4.41 pg/L), the P95 concentration will not drop below the non-
cancer SL after numerous sampling events (see Appendix D).
2.4 Conclusions
Based on results from the October 2017 groundwater monitoring event and past investigations
at the Site:
• Groundwater flow is toward the north and the Sevier River.
• Groundwater impacts are limited to the shallow aquifer near the water table.
• Phase-separated oil has been observed in a well near and downgradient of the
hydraulic-oil release (MW-12); the oil is not practically recoverable from the well.
• All VOC concentrations were below regulatory standards and risk-based screening
levels in October 2017.
• Accounting for uncertainty in the VOC trend analysis, only naphthalene at MW-7 has
an upper-bound (P95) potential level above the non-cancer SL; however, the last two
samples collected at that monitoring well had naphthalene concentrations below the
non-cancer SL. Additionally, a predictive analysis indicates that even after numerous
sampling events with the same concentrations of naphthalene that are currently
present, the P95 concentration would not drop below the non-cancer SL.
April 13, 2016 TETRA TECH 7
2017 Groundwater Monitoring Report
Georgia-Pacific Former Gypsum Manufacturing Facdity
3 PROPOSED PATH FORWARD
Based on measured groundwater quatity, estimates of future plume behavior, and an
assessment of potential human health risks conducted previously by Tetra Tech (2016, 2017),
active remedialion to address groundwater impacts is not warranted. Avoidance of future
exposure risks can be assured through appropriate land use restrictions.
3.1 Monitored Natural Attenuation of Diesel-Related Groundwater Impacts
Based on sampling results from the October 2017 sampling event, it is recommended that
groundwater sampling cease at the Site. All VOC concentrations measured from the October
2017 sampling event were below regulatory standards and risk-based screening levels.
Additionally, the statistical evaluation conducted on results from the October 2017 event
indicated that only naphthalene at MW-7 has an upper-bound (P95) potential level above the
non-cancer SL, and that the last two samples collected at MW-7 resulted in naphthalene
concentrations below the non-cancer SL. A predictive analysis conducted as part of this report
shows that even with numerous additional sampling events that result with naphthalene
concentrations below the non-cancer SL at MW-7, the P95 concentrations will not drop below
the non-cancer SL. Because it will take numerous additional sampling events to show with
95% confidence that the nonparametric Theil-Sen trend line is less than the non-cancer SL for
naphthalene at MW-7, Tetra Tech proposes that sampling be discontinued at the Site and that
the naphthalene concentration at MW-7 be considered below the appropriate threshold for
VOCs.
3.2 Institutional Control
Future use of Site groundwater as a drinking-water source should be prohibited. This can be
accomplished with a restrictive covenant that becomes part of the property deed records.
4
April 13, 2018 TETRA TECH 8
2017 Grouidwater Monitoring Report
Georgia-Pacific Former Gypsum Manufacturing Facility
4 REFERENCES
AMEC Earth & Environmental, Inc., 2010. Site Visit Memorandum. October 4.
EPA, 2009. Statistical Analysis of Groundwater Monitoring Data at RCRA Facilities—Unified
Guidance. EPA Publication 530/R-09-007. March.
Natresco & Associates, 2006. Soil Investigation, Hydraulic Fluid Leak. Prepared for Georgia
Pacific Gypsum. Report Dated September 20, 2006.
R Core Team, 2012. R: A language and environment for statistical computing. R Foundation
for Statistical Computing, Vienna, Austria. ISBN 3-900051-07-0 (URL: http://www.R-
projectorga
Tetra Tech, 2011. Subsurface Investigation Petroleum Hydrocarbon Release. Prepared for
Georgia-Pacific LLC. Report Dated September 16, 2011. 287 pp.
Tetra Tech, 2012. Sampling and Analysis Plan and Quality Assurance and Control Plan.
Prepared for Georgia-Pacific LLC. Report Dated October 25, 2012.
Tetra Tech, 2013. Phase II Subsurface Investigation, Petroleum Hydrocarbon Release, GP
Gypsum Manufacturing Facility. Technical report prepared for Georgia-Pacific LLC, August 13.
Tetra Tech, 2015. GP Gypsum 2014 Groundwater Monitoring Report. Technical report
submitted to David Wheeler, Utah DEQ. April 14.
Tetra Tech, 2017. Groundwater Quality Evaluation Update and Source-Area
Investigation/Excavation Completion Report Version 2. July 31, 2017.
4
April 13, 2018 TETRA TECH 9
2017 Groundwater Monitoring Report
Georgia-Pacific Former Gypsum Manufacturing Facility
FIGURES
April 13, 2018 TETRA TECH
MI MI MN MI MN MN NM NOM OM 11111 NM 101111 NM MN NM
i ,,---.7,-_-;-'-,--t•-- ' tatirel L- .•
Station
6M 5256
- A 0. ts 1
i I i IJI V. /
--1
-
I
I . •
/
Sigurd
•• . •
)
I r
I ..i
: *
•
. •
— -A.-
*
AL
-0-
• 11 6

- , -?---'
'..-..-rf 1.1 -,,,-

••• •7 11 ' 0
.

. Ý .17
i
eV , -1 # ,,,,,,
(6) i *1)/

6' / /•• I J
'., •
')
.--)
"- - . * (LI i . \_(-- ) , •
i , r/I ///1./.'-':..j; r.,, '1 ..,,i,/,; /
i to / I/1 ibLeiet • ' 2
.
% ‘
lir
/ --- - Sig
1 11 2,1_ ir, + I C
IR JP: ,
P Í t ,,,,) jr(--ii
I -.3
I .-(Y
1)
S: / 1111%
ti,"' r , 4
C f tl:i.

`, t Li
'

f1•" •
_
1.6
•
.
.
• •
•
. . . .-,
i ' t ph
.
II — •
1 . I '
— .4(
1.0''' ' I
,
-.-
•
I ' .1
,--
tf.-

, ,,,i ,..vir
.1j , r , i i I

, . _........
t•

.'.• .. iot ,. ...... •
04.. -_ ...
1
!
0
s.,,,
..
•-•":.`",
oi 44 Co
,.,.V.)
,
1.10S3ti
5
.
.
),„- ,. II - ,a• - ,-a...,,
.. . ,......, ..,,,,
‘,-
, i4 ..-:.• z...- . .
...-:. .›. - +_ --.. , ..- -,.. ,

/ '''..";" - , .r......-... - -1- - . „.„....., ...
---....
-,,-..---.....- --•
+

.... ._. . _
0,- , 1--'.

.. , .. - 1,1
• . -, i . - ..-,' s ._ . \ , 1 5- C r ...
1 .1 1 ,,. ,
. ,. ) ) ' / . AP P R OXPATt SCALE P.I FEET
P-- i

Nev -- _ ..
cit., • ti • "---
612°0,i/
,•
- '-'-
•
.
FIGURE 1
SITE LOCATION MAP
SEVIER RIVER
US GYPSUM PROPERTY
ALMA CORD PROPERTY
9.000 OR 5.000 GALLON DIESEL UST
MUNICIPAL WATER SUPPLY LINE
_,„0- FUEL STATION
0"
CHECK IN STATION
MW5
MW15-/fr
(2) 1,000 GALLON
GASOLINE UST
-joy-COMPANY OFFICE
1
MW4
POSSIBLE FORMER 5.000 GALLON UST
EXIS11NG GAS LINE
500 GALLON GASOLINE UST
M W12
MW1
(2) 10,000 GALLON DIESEL AST
.0-}--APPROXIMATE LOCATION OF
CLOSED LANDFARM
9,000 GALLON FUEL OIL °--0IL STORAGE
EAST QUARTER CORNER OF SECTION 1 T.23 S., R.2 W.,
LEGEND
SECTION UNE
QUARTER SECTION UNE
G-P GYPSUM PROPERTY BOUNDARY
EXISTNG STRUCTURES
FORMER STRUCTURES
UNDERGROUND GAS UNE
QUARTER SECTION CORNER AS NOTED
MONITORMG WELL
UNDERGROUND WATER UNE (APPROXIMATE LOCATION)
C-D
SCALE IN FEET ISISEE!!!!
0 200
TAKEN FROM JONES AND DEMILLE ENGINEERING, INC PROJECT 1106-095, DATED 12-10-12
MODIFIED BY TETRA TECH, JANUARY 2013
FEBRUARY 2018
FIGURE 2
GP GYPSUM FACILITY SITE LAYOUT
GP GYPSUM, INC.
2017 Gromdwater Monitonng Report
Georgia-Pacific Former Gypsum Manufactunng Facility
APPENDIX A.
ANALYTICAL LABORATORY REPORT
1
April 13, 2018 TETRA TECH
TestAmerica
THE LEADER IN ENVIRONMENTAL TESTING
ANALYTICAL REPORT
TestAmerica Laboratories, Inc.
TestAmerica Nashville
2960 Foster Creighton Drive
Nashville, TN 37204
Tel: [phone]
TestAmerica Job ID: 490-139683-1
Client Project/Site: Sigurd, UT
For:
Tetra Tech GEO
1165 Sanctuary Parkway
Suite 270
Alpharetta, Georgia 30009
Attn: Dr. Scott Simpson
4.-44
Authorized for re/ease by:
11/1/2017 3:21 :34 PM
Ken Hayes, Project Manager II
[phone]
ken. hayes@testame rica inc. com
lieview your project
Tesultsihrough
Have a Question.
Ask
The
Ex ert
The test results in this report meet all 2003 NELAC and 2009 TM requirements for accredited
parameters, exceptions are noted in this repoit. This report may not be reproduced except in full,
and with written approval from the laboratory. For questions please contact the Project Manager
at the e-mail address or telephone number listed on this page.
This report has been electronical4r signed and authorized by the signatory. Electmnic signature is intended to be the legally binding equwalent of a traditionally handwntten signature.
Milt us at:
www.testamericainc.com Results relate only to the items tested and the sample(s) as received by the laboratory.
Client: Tetra Tech GEO TestAmerica Job ID: 490-139683-1
Project/Site: Sigurd. UT
Table of Contents
Cover Page 1
Table of Contents 2
Sample Summary 3
Case Narrative 4
Definitions 5
Client Sample Results 6
QC Sample Results 17
QC Association 19
Chronicle 20
Method Summary 22
Certification Summary 23
Chain of Custody 24
Receipt Checklists 26
Ei
TestAm erica Nashville Page 2 of 26 11/1/2017
Sample Summary
Client: Tetra Tech GEO
Project/Site: Sigurd, UT
TestAmerica Job ID: 490-139683-1
Lab Sample ID Client Sample ID Matrix Collected Received
490-139683-1 MW4 Wa ter 10/26/17 11:00 10/28/17 09:55
490-139683-2 MW-5 Wa ter 10/26/17 0a55 10/28/17 09:56
490-139683-3 MW-6 Wa ter 10/26/17 1825 10/28/17 09:55
490-139683-4 MW-7 Wa ter 10/26/17 13:40 10/28/17 0955
490-139683-5 MW-9 Wa ter 10/26/17 15:15 10/28/17 09:55
490-139683-6 MW-12 Wa ter 10/26/17 17:55 10/28/17 09:55
490-139683-7 MW-13 Wa ter 10/26/17 17:05 10/28/17 0a55
490-139683-8 MW-15 Wa ter 10/26/17 0850 10/28/17 09:55
490-139683-9 MW-17 Wa ter 10/26/17 16:05 10/28/17 09:55
490-139683-10 Du p-1 Wa ter 10/26/17 1Z 00 10/28/17 oa55
490-139683-11 Tnp Blank Wa ter 10/26/17 00:01 10/28)17 0955
,t q
TestAmenca Nashville
Page 3 of 26 11/1/2017
Case Narrative
Client: Tetra Tech GEO TestAmerica Job ID: 490-139683-1
Project/Site: Sigurd, UT
Job ID: 490-139683-1
Laboratory: TestAmerica Nashville
Narrative
Job Narrative
490-139683-1
Comments
No additional comments.
Receipt
The samples were received on 10/28/2017 9:55 AM; the samples arrived in good condition, properly preserved and, where required, on
ice. The temperature of the cooler at receipt was 4.3° C.
GCIMS VOA
No analytical or quality issues were noted, other than those described in the Defnitions/Glossary page.
VOA Prep
No analytical or quality issues were noted, other than those described in the Definitions/Glossary page.
TestAmerica Nashville
Page 4 of 26 11/1/2017
Definitions/Glossary
Client: Tetra Tech GEO TestAmerica Job ID: 490-139683-1
Project/Site: Sigurd, UT
Qualifiers
GC/MS VOA
Qualifier Qualifier Description
Indicates the analyte was analyzed for but not detected.
Result is less than the RL but greater than or equal to the MDL and the concentration is an approximate value.
Glossary
Abbreviation These commonly used abbreviations may or may not be present in this report.
a Listed under the '13" column to designate that the result is reported on a dry weight basis
%R Percent Recovery
CFL Contains Free Liquid
CNF Contains No Free Liquid
DER Duplicate Error Ratio (normalved absolute dfference)
Dil Fac Dilution Factor
DL Detection Limit (DoD/DOE)
DL, RA, RE, IN Indicates a Dilution, Re-analysis, Re-extraction, or additional Initial metals/anion analysis of the sample
DLC Decision Level Concentration (Radiochemistry)
EDL Estimated Detection Limit (Dioxin)
LOD Limit of Detection (DoD/DOE)
LOQ Limit of Quantitation (DoD/DOE)
MDA Minimum Detectable Activity (Radiochemistry)
MDC Minimum Detectable Concentration (Radiochemistry)
MDL Method Detection Limit
ML Minimum Level (Dioxin)
NC Not Calculated
ND Not Detected at the reporting limit (or MDL or EDL if shown)
PQL Practical Quantitation Limit
QC Quality Control
RER Relative Error Ratio (Radiochemistry)
RL Reporting Limit or Requested Limit (Radiochemistry)
RPD Relative Percent Difference, a measure of the relative difference between taro points
TEF Toxicity Equivalent Factor (Dioxin)
TEQ Toxicity EquivalentQuotient (Dioxin)
TestAmerica Nashville
Page 5 of 26 11/1/2017
Client Sample Results
Client: Tetra Tech GEO TestAmerica Job ID: 490-139683-1
Project/Site: Sigurd, UT
Client Sample ID: MW-4 Lab Sample ID: 490-139683-1
Date Collected: 10/26/17 11:00 Matrix: Water
Date Received: 10/28/17 09:55
Method: 8260B - Volatile Organic Compounds (GC/MS)
Analyte Result Qualifier RL MDL Unit D Prepared Analyzed Dil FaG
Benzene 0.200 U 1.00 0200 ug 10/31/17 12:45 1
Ethylbenzene 0.190 U 1.00 0.190 ug/L 10/31/17 1245 1
Naphthalene 0.210 U 5.00 0.210 ug/L 10/31/17 1245 1
Toluene 0.170 U 1.00 0.170 ug/L 10/31/17 1245 1
Xylen es, Total 0.580 U 100 0.580 ug/L 10/31/17 1245 1
Surrogate %Recovery Qualifier Limits Prepared Analyzed Coil Ric
1,2-Dichloroethane-d4 (Sun) 101 70 - 130 10/31/17 1245 1
4-Bromofluorobenzene (Sun) 96 70 - 130 10/31/17 12:45 1
Dobromofluoromethane (Sun) 104 70 - 130 10/31/17 1245 1
Toluene-d8 (Sun) 94 70 - 130 10/31/17 1245 1 _
4
TestAmerica Nashville
Page 6 of 26 11/1/2017
Client Sample Results
Client: Tetra Tech GEO TestAmerica Job ID: 490-139683-1
Project/Site: Sigurd, UT
Client Sample ID: MVV-5 Lab Sample ID: 490-139683-2
Date Collected: 10/26/17 09:55 Matrix: Water
Date Received: 10/28/17 09:55 -
Method: 8260B - Volatile Organic Compounds (GC/MS)
Analyte Result Qualifier RL MDL Unit D Prepared Analyzed Dil Fac
Benzene 0.200 U 1.00 0.200 ug/L 10/31/17 13:12 1
Ethylbenzene 0.190 U 1.00 0.190 ug/L 10/31/17 13:12 1
Naphthalene 0.210 U 5.00 0.210 ug/L 10/31/17 13:12 1
Toluene 0.170 U 1.00 0.170 ug/L 10/31/17 13:12 1
Xylenes, Total 0.580 U 3.00 0.580 ug/L 10/31/17 13:12 1
Surrogate %Recovery Qualifier Limits Prepared Analyzed Dil Fac
1,2-Dichloreethane-d4 (Sun) 101 70 - 130 10/31/17 13:12 1
4-Bromotluorobenzene (Sum) 108 70 - 130 10/31/17 1312 1
abromoikioromethane (Sun) 103 70 - 130 10/31/17 13:12 1
Toluene-d8 (Surd 98 70- 130 10/31/17 1312 1 _
TestAmerica Nashville
Page 7 of 26 11/1/2017
Client Sample Results
Client: Tetra Tech GEO TestAmerica Job ID: 490-139683-1
Project/Site: Sigurd, UT
Client Sample ID: MVV-6 Lab Sample ID: 490-139683-3
Date Collected: 10/26/17 18:25 Matrix: Water
Date Received: 10/28/17 09:55
Method: 8260B - Volatile Organic Compounds (GC/MS)
Analyte Result Qualifier RL MDL Unit 0 Prepared Analyzed Dil Fac
Benzene 0.200 U 1.00 0200 ug/L 10/31/17 13:38 1
Ethylbenzene 0.190 U 1.00 0.190 ug/L 10/31/17 13:38 1
Naphthalene 0210 U 5.00 0210 ug/L 10/31/17 13:38 1
Toluene 0.170 U 1.00 0.170 ug/L 10/31/17 13:38 1
Xylenes, Total 0.580 U 3.00 0.580 ug/L 10/31/17 13:38 1
Surrogate

%Recovety Qualifier Limits Prepared Analyzed Dll Fac

1,2-Dichloroethane-d4 (Sun) 101 70- 130 10/31/17 13:38 1
4-Brotnofluorobenzene (Sun) 98 70 -130 10/31/17 1138 1
Dibrotnoftuoromethane (Sun) 105 70 - 130 10/31/17 13:38 1
Toluene-d8 (Sun) 102 70 - 130 10/31/17 13:38 1
4
TestAmerica Nashville
Page 8 of 26 11/1/2017
Client Sample Results
Client: Tetra Tech GEO TestAmerica Job ID: 490-139683-1
Project/Site: Sigurd, UT
Client Sample ID: PAW-7 Lab Sample ID: 490-139683-4
Date Collected: 10/26/17 13:40 Matrix: Water
Date Received: 10/28/17 09:55 -
Method: 8260B - Volatile Organic Compounds (GC/MS)
Analyte Result Qualifier RL PADL Unit D Prepared Analyzed Oil Fac
Benzene 0.200 U 1.00 0.200 ug/L 10/31/17 14:57 1
Ethylbenzene 0.504 J 1.00 0.190 ug/L 10/31/17 14:57 1
Naphthalene 4.41 J 5.00 0.210 ug/L 10/31/17 14:57 1
Toluene 0.170 U 1.00 0.170 ug/L 10/31/17 14:57 1
Xylenes. Total 0.580 U 3.00 0.580 ug/L 10/31/17 14:57 1
Surrogate %Recovery Qualifier Limits Prepared Analyzed Dil Pac
1,2-Dichlomethane-d4 (Sun) 100 70 - 130 10/31117 14:57 1
4-13romofluorobenzene (Sun) 101 70 - 130 10/31/17 14:57 1
Dobromoffuoromethane (Sun-) 103 70 - 130 10/31/17 14:57 1
Toluene-d8 (Sun) 101 70 - 130 10/31/17 14:57 1 _
TestAmerica Nashville
Page 9 of 26 11/1/2017
Client Sample Results
Client: Tetra Tech GEO TestAmerica Job ID: 490-139683-1
Project/Site: Sigurd, UT
Client Sample ID: MVV-9 Lab Sample ID: 490-139683-5
Date Collected: 10/26/17 15:15 Matrix: Water
Date Received: 10/28/17 09:55 -
Method: 8260B - Volatile Organic Compounds (GC/MS)
Analyte Result Qualifier RL MDL Unit 0 Prepared Analyzed Dil Fac
Benzene 0200 U 1.00 0.200 ug/L 10/31/17 15:24 1
Ethylbenzene 0.190 U 1.00 0.190 ug/L 10/31/17 15:24 1
Naphthalene 1.01 J 5.00 0.210 ug/L 10/31/17 15:24 1
Toluene 0.170 U 1.00 0.170 ug/L 10/31/17 15:24 1
Xylenes, Total 0.580 U 3.00 0.580 ug/L 10/31/17 15:24 1
Surrogate %Recovery Qualifier Limits Prepared Analyzed Dil Fac
1,2-Dichloroethane-d4 (Sun) 101 70 - 130 10/31/17 15:24 1
4-Bromoiluorobenzene (Sun) 96 70 - 130 1 OP31/17 15:24 1
Dibromofkloromethane (Sun) 104 70 - 130 10/31/17 15:24 1
Toluene-d8 (Sun) se 70 - 130 10/31/17 15:24 1 _
TestAmerica Nashville
Page 10 of 26 11/1/2017
Client Sample Results
Client: Tetra Tech GEO TestAmerica Job ID: 490-139683-1
Project/Site: Sigurd, UT
Client Sample ID: MVV-12 Lab Sample ID: 490-139683-6
Date Collected: 10/26/17 17:55 Matrix: Water
Date Received: 10/28/17 09:55 -
Method: 82608 - Volatile Organic Compounds (GC/MS)
Analyte Result Qualifier RL PADL Unit D Prepared Analyzed 011 Fac
Benzene 0200 U 1.00 0.200 ug/L 10/31/17 15:50 1
Ethylbenzene 0.190 U 1.00 0.190 ug/L 10/31/17 15:50 1
Naphthalene 0.210 U 5.00 0.210 ug/L 10/31/17 15:50 1
Toluene 0.170 U 1.00 0.170 ug/L 10/31/17 15:50 1
Xylenes. Total 0.580 U 3.00 0.580 ug/L 10/31/17 15:50 1
Surrogate %Recovery Qualifier Limits Prepared Analyzed Dil Fac
1,2-Dtchloroethane-d4 (Sun) 98 70-130 10/31/17 15:50 1
4-Bmmofluorobenzene (Surr) 105 70-130 10/31/17 15:50 1
DibnDmofkioromethane (Sun) 104 70-130 10/31/17 15:50 1
Toluene-d8 (Sun) 95 70-130 10/31/17 15:50 1 _
TestAmerica Nashville
Page 11 of 26 11/1/2017
Client Sample Results
Client: Tetra Tech GEO TestAmerica Job ID: 490-139683-1
Project/Site: Sigurd, UT
Client Sample ID: NIW-13 Lab Sample ID: 490-139683-7
Date Collected: 10/26/17 17:05 Matrix: Water
Date Received: 10/28/17 09:55
Method: 8260B - Volatile Organic Compounds (GC/MS)
Analyte Result Qualifier RL MDL Unit D Prepared Analyzed DO Fac
Benzene 0.584 J 1.00 0.200 ug/L 10/31/17 16:16 1
Ethylbenzene 1.99 1.00 0.190 ug/L 10/31/17 16:16 1
Naphthalene 1.02 J 5.00 0210 ug/L 10/31/17 16:16 1
Toluene 0.170 U 1.00 0.170 ug/L 10/31/17 16:16 1
Xylenes, Total 0.580 U 3.00 0.580 ug/L 10/31/17 16:16 1
Surrogate

%Recovery Qualifier Limits Prepared Analyzed Oil Ric

"I ,2-Dichloroethane-d4 (Sun, 92 70 - 130 10t31/17 16:16 1
4-Bromofluorobenzene (Surd 105 70 - 130 10/31/17 16:16 1
Dibromofluoromethane (Sum) 102 70 - 130 10/31/17 16:16 1
Toluene-d8 (Surr) 100 70 - 130 10/31/17 16:16 1
4
TestAmerica Nashville
Page 12 of 26 11/1/2017
Client Sample Results
Client: Tetra Tech GEO TestAmerica Job ID: 490-139683-1
Project/Site: Sigurd, UT
Client Sample ID: MW-15 Lab Sample ID: 490-139683-8
Date Collected: 10/26/17 08:50 Matrix: Water
Date Received: 10/28/17 09:55
Method: 8260B - Volatile Organic Compounds (GC/MS)
Analyte Result Qualifier RL MIX Unit 0 Prepared Analyzed Dil Fac
Benzene 0.200 U 1.00 0.200 ug/L 10/31/17 14:05 1
Ethylbenzene 0.190 U 1.00 0.190 ug/L 10/31/17 14:05 1
Naphthalene 0.210 U 5.00 0210 ug/L 10/31/17 14:05 1
Toluene 0.170 U 1.00 0.170 ug/L 10/31/17 14:05 1
Xylen es, Total 0.580 U 3.00 0.580 ug/L 10/31/17 14:05 1
Surrogate %Recovery Qualifier Limits Prepared Analyzed Dil Fac
1 ,2-achloroethane-d4 (Surr) 103 70 -130 1001/17 14:05 1
4-Baynciluorobenzene (Sur?) 97 70 - 130 10/31/17 14:05 1
abromofluoromethane (Surr) 105 70 - 130 10/31/17 14:05 1
Toluene-d8 (Sum) 101 70 -130 10/31/17 14:05 1 _
TestAmerica Nashville
Page 13 of 26 11/1/2017
Client Sample Results
Client: Tetra Tech GEO TestAmerica Job ID: 490-139683-1
Project/Site: Sigurd, UT
Client Sample ID: MW-17 Lab Sample ID: 490-139683-9
Date Collected: 10/26/17 16:05 Matrix: Water
Date Received: 10/28/17 09:55
Method: 8260B - Volatile Organic Compounds (GC/MS)
Analyte Result Qualifier RL MDL Unit 0 Prepared Analyzed Dil Pas
Benzene 0200 U 1.00 0200 ug/L 10/31/17 14:31 1
Ethylbenzene 0.190 U 1.00 0.190 ug/L 10/31/17 14:31 1
Naphthalene 0.210 U 5.00 0210 ug/L 10/31/17 14:31 1
Toluene 0.170 U 1.00 0.170 ug/L 10/31/17 14:31 1
Xylen es, Total 0380 U 3.00 0.580 ug/L 10/31/17 14:31 1
Surrogate %Recovery Qualifier Limits Prepared Analyzed Dil Fac
1,2-Dichloroethane-d4 (Sun) 103 70 -130 10/31/1 7 14:31 1
443romolluorobenzene (Sun) 98 70 -130 10/31/17 14:31 1
Dtbromofluommethane (Sun) 105 70 - 130 10/31/17 14:31 1
Toluene-d8 (Sun) 101 70 - 130 10/31/17 14:31 1 _
TestAmerica Nashville
Page 14 of 26 11/1/2017
Client Sample Results
Client: Tetra Tech GEO TestAmerica Job ID: 490-139683-1
Project/Site: Sigurd, UT
Client Sample ID: Dup-1 Lab Sample ID: 490-139683-10
Date Collected: 10/26/17 12:00 Matrix: Water
Date Received: 10/28/17 09:55
— Method: 8260B - Volatile Organic Compounds (GC/MS)
Analyte Result Qualifier RL MDL Unit 0 Prepared Analyzed Dil PIK
Benzene 0.200 U 1.00 0.200 ug/L 10/31/17 16:42 1
Ethylbenzene 0.190 U 1.00 0.190 ug/L 10/31/17 16:42 1
Naphthalene 0.210 U 5.00 0210 ug/L 10/31/17 16:42 1
Toluene 0.170 U 1.00 0.170 ug/L 10/31/17 16:42 1
Xylen es, Total 0.580 U 3.00 0.580 ug/L 10/31/17 16:42 1
6
Surrogate %Recovery Qualifier Limits
1,2-Dichloroethane-d4 (Sun) 97 70 - 130
4-Bromofluonabenzene (Sun) 98 70 -130
Dibromofluoromefhane (Sun) 103 70 - 130
Toluene-d8 (Sun) 102 70 - 130 _
Prepared Analyzed Di! Fac
10/31117 16:42
10/31117 16:42
10131/17 16:42 1
10131117 16:42 1
TestAmerica Nashville
Page 15 of 26 11/1/2017
Client Sample Results
Client: Tetra Tech GEO TestAmerica Job ID: 490-139683-1
Project/Site: Sigurd, UT
Client Sample ID: Trip Blank Lab Sample ID: 490-139683-11
Date Collected: 10/26/17 00:01 Matrix: Water
Date Received: 10/28/17 09:55
— Method: 8260B - Volatile Organic Compounds (GC/MS)
Analyte Result Qualifier RL AWL Unit D Prepared Analyzed Dil Fac
Benzene 0200 U 1.00 0200 ug/L 10/31/17 12:19 1
Ethylbenzene 0.190 U 1.00 0.190 ug/L 10/31/17 1219 1
Naphthalene 0210 U 5.00 0.210 ug/L 10/31/17 1219 1
Toluene 0.170 U 1.00 0.170 ug/L 10/31/17 1219 1
Xylenes. Total 0.580 U 3.00 0.580 ug/L 10/31/17 1219 1
Surrogate %Recovery Qualifier Limits Prepared Analyzed Dil Fac
1 ,2-Dichloroethane-d4 (Sun) 100 70 -130 10/31/17 1219 1
4-Bromofluorobenzene (Sun) 99 70-130 10/31/17 12:19 1
Dibrornoffuorornethane (Sun) 103 70 - 130 10/31/17 1219 1
Toluene-dB (Sun) 102 70 - 130 10/31/17 1219 1 _
TestAmerica Nashville
Page 16 of 26 11/1/2017
QC Sample Results
Client: Tetra Tech GEO TestAmerica Job ID: 490-139683-1
Project/Site: Sigurd, UT
Method: 8260B - Volatile Organic Compounds (GC/MS)
_
Lab Sample ID: MB 490-472175/6 Client Sample ID: Method Blank
Matrix: Water Prep Type: Total/NA
Analysis Batch: 472175
MB MB
Analyte Result Qualifier RL MDL Unit D Prepared Analyzed Dil Fac
Benzene 0.200 U 1.00 0.200 ug/L 10/31/17 11:46 1
Ethylbenzene 0.190 U 1.00 0.190 ug/L 10/31/17 11:46 1
Naphthalene 0.210 U 5.00 0.210 ug/L 10/31/17 11:46 1
Toluene 0.170 U 1.00 0.170 ug/L 10/31/17 11:46 1
Xylenes, Total 0380 U 3.00 0.580 ug/L 10/31/17 11:46 1
MB MB
Surrogate %Recovery Qualifier Limits Prepared Analyzed Dil Fac
1 ,2-Dschloroethane-d4 (Sun) 102 70 - 130 10/31/17 11:46 1
4-Bromofluorobenzene (Sun) 97 70- 130 10131/17 11:46 1
abromofluoromethane (Sun) 105 70 -130 10/31/17 11:46 1
Toluene-d8 (Sun.) 103 70- 130 10/31/17 11:46 1 - -
Lab Sample ID: LCS 490-472175/3
Matrix: Water
Analysis Batch: 472175
Client Sample ID: Lab Control Sample
Prep Type: Total/NA

Spike LCS LCS %Rec.
Analyte Added Result Qualifier Unit D %Rec Limits
Benzene 50.0 52.82 ug/L 106 70 -130
Ethylbenzene 50.0 53.12 ug/L 106 70 -130
Naphthalene 50.0 53.49 ug/L 107 54 -150
Toluene 50.0 49.92 ug/L 100 70 - 130
Xylenes, Total 150 155.8 ug/L 104 70 - 132
LCS LCS
Surrogate %Recovery Qualifier Limits
1,2-Dichloroethane-d4 (Surr) 107 70 -130
4-Bromoftuorobenzene (Sun) 96 70 -130
Dibromofiuoromethane (Sun) 103 70 _130
Toluene-d8 (Sun) 95 70 -130 - -
Lab Sample ID: LCSD 490-472175/4 Client Sample ID: Lab Control Sample Dup
Matrix: Water Prep Type: Total/NA
Analysis Batch: 472175
4 Spike LCSD LCSD . %Rec. RPD
Analyte Added Result Qualifier Unit D %Rec Limits RPD Limit
Benzene 50.0 51.29 ug/L 103 70 - 130 3 12
Ethylbenzene 50.0 52.52 ug/L 105 70 - 130 1 12
Naphthalene 50.0 49.59 ug/L 99 54 - 150 8 15
Toluene 50.0 50.14 ug/L 100 70 - 130 0 13
Xylenes, Total 150 159.3 ug/L 106 70 - 132 2 11
LCSO LCSD
Surrogate %Recovery Qualifier Limits
1 ,2-Dtchloroethane-d4 (Sun) 106 70 -130
4-Bromofluorobenzene (Sun-) 96 70 _130
Dibromoftuoromethane (Sun) 103 70 -130
Toktene-d8 (Sun) 97 70-130 _
TestAmerica Nashville
Page 17 of 26 11/1/2017
QC Sample Results
Client: Tetra Tech GEO TestAmerica Job ID: 490-139683-1
Project/Site: Sigurd, UT
Method: 8260B - Volatile Organic Compounds (GC/MS) (Continued)
Lab Sample ID: 490-139683-1 MS
Matrix: Water
Analysis Batch: 472175 Sample Sample
Analyte Result Qualifier
Spike
Added
MS MS
Result Qualifier Unit
Client Sample ID: MW-4
Prep Type: Total/NA
%Rec.
D %Rec Limits
Benzene 0.200 U
Ethylbenzene 0.193 U
Naphthalene 0.210 U
Toluene 0.170 U
Xylenes, Total 0.580 U
50.0
50.0
50.0
50.0
150
55.25
55.55
46.77
53.43
166.9
ug/L
ug/L
ug/L
ug/L
ug/L

110 55- 147

111 65 - 139

94 32 - 150

107 64 - 136

111 69-132
MS MS
Surrogate %Recovery Qudifier Limits
1,2-Dichlomethane-d4 (Sun) 102 70 -130
4-Bromofluorobenzene (Sun) 101 70-130
Dtbromotluoromethane (Sun) 103 70 - 130
Toluene-dB (Sun) 97 70-130
Lab Sample ID: 490-139683-1 MSD Client Sample ID: MW-4
Matrix: Water Prep Type: Total/NA
Analysis Batch: 472175
Sample Sample Spike MSD MSD %Rec. RPD
Analyte Result Qualifier Added Result Qualifier Unit D %Rec Limits RPD Limit
Benzene 0.200 U 50.0 55.87 ug/L 112 55 - 147 1 22
Ethylbenzene 0.193 U 50.0 55.81 ug/L 112 65-139 0 18
Naphthalene 0210 U 50.0 47.76 ug/L 96 32 - 150 2 40
Toluene 0.170 U 50.0 56.80 ug/L 114 64 -136 6 18
Xylenes, Total 0.580 U 150 172.3 ug/L 115 69-132 3 17
MSD MSD
Surrogate %Recovery Qualifier Limits
1,2-Dochloroethane-d4 (Sun) 103 70 - 130
4-Bromofluorobenzene (Star) 98 70 -130
Dibromoiluoromethane (Surr) 102 70 _130
Toluene-d8 (Surd 103 70-130
TestAmerica Nashville
Page 18 of 26 11/1/2017
QC Association Summary
Client: Tetra Tech GEO TestAmerica Job ID: 490-139683-1
Project/Site: Sigurd, UT
GC/MS VOA
Analysis Batch: 472175
Lab Sample ID Client Sample ID Prep Type Matrix Method Prep Batch
490-139683-1 MW-4 Total/NA Water 82608
490-139683-2 MW-5 Total/NA Water 82608
490-139683-3 MW-6 Total/NA Water 8260B
490-1396834 MW-7 TotaVNA Water 8260B
490-139683-5 MW-9 Total/NA Water 8260B
490-139683-6 MW-12 Total/NA Water 8260B
490-139683-7 MW-13 Total/NA Water 8260B
490-139683-8 MW-15 Total/NA Water 8260B
490-139683-9 MW-17 Total/NA Water 8260B
490-139683-10 Dup-1 Total/NA Water 8260B
490-139683-11 Trip Bank Total/NA Water 8260B
MB 490-472175/6 Method Blank Total/NA Water 8260B
LCS 490-472175/3 Lab Control Sample Total/NA Water 8260B
LCSD 490472175/4 Lab Control Sample Dup Total/NA Water 82608
490-139683-1 MS MW-4 Total/NA Water 82608
490-139683-1 MSD MW4 Total/NA Water 8260B _
TestAmerica Nashville
Page 19 of 26 11/1/2017
Lab Chronicle
Client: Tetra Tech GEO TestAmerica Job ID: 490-139683-1
Project/Site: Sigurd, UT
Client Sample ID: MW-4 Lab Sample ID: 490-139683-1
Date Collected: 10/26/17 11:00 Matrix: Water
Date Received: 10/28/17 09:55
-
Batch Batch Dil initial Final Batch Prepared
Prep Type Type Method Run Factor Amount Amount Number or Analyzed Analyst Lab
_ Total/NA Analysis 8260B 1 10 mL 10 mL 472175 10/31/17 12:45 RP TAL NSH
Client Sample ID: MW-5 Lab Sample ID: 490-139683-2
Date Collected: 10/26/17 09:55 Matrix: Water
Date Received: 10/28/17 09:55
-
Batch Batch Dil Initial Final Batch Prepared
Prep Type Type Method Run Factor Amount Amount Number or Analyzed Analyst Lab
_ Total/NA Analysis 8260B 1 10 mL 10 mL 472175 10/31/17 13:12 RP TAL NSH
Client Sample ID: MW-6 Lab Sample ID: 490-139683-3
Date Collected: 10/26/17 18:25 Matrix: Water
Date Received: 10/28/17 09:55
Batch Batch Dil initial Final Batch Prepared
Prep Type Type Method Run Factor Amount Amount Number or Analyzed Analyst Lab
_ Total/NA Analysis 8260B 1 10 mL 10 mL 472175 10/31/17 13:38 RP TAL NSH
Client Sample ID: MW-7 Lab Sample ID: 490-139683-4
Date Collected: 10/26/17 13:40 Matrix: Water
Date Received: 10/28/17 09:55
-
Batch Batch Dil initial Final Batch Prepared
Prep Type Type Method Run Factor Amount Amount Number or Analyzed Analyst Lab
_ TotaVNA Analysis 6260B 1 10 mL 10 mL 472175 10/31/17 14:57 RP TAL NSH
Client Sample ID: MW-9 Lab Sample ID: 490-139683-5
Date Collected: 10/26/17 15:15 Matrix: Water
Date Received: 10/28/17 09:55
-
Batch Batch Dil Initial Final Batch Prepared
Prep Type Type Method Run Factor Amount Amount Number or Analyzed Analyst Lab
_ Total/NA Analysis 8260e
Client Sample ID: MW-12
Date Collected: 10/26/17 17:55
Date Received: 10/28/17 09:55
1 10 mL 10 mL 472175 10/31/17 15:24 RP TAL NSH
4
Lab Sample ID: 490-139683-6
Matrix: Water
Batch Batch Dil Initial Final Batch Prepared
Prep Type Type Method Run Factor Amount Amount Number or Analyzed Analyst Lab
Total/NA Analysis 6260B 1 10 mL 10 mL 472175 10/31/17 15:50 RP TAL NSH -
TestAmerica Nashville
Page 20 of 26 11/1/2017
Client Sample ID: MW-13
Date Collected: 10/26/17 17:05
Date Received: 10/28/17 09:55
Lab Sample ID: 490-139683-7
Matrix: Water
Client Sample ID: MW-15
Date Collected: 10/26/17 08:50
Date Received: 10/28/17 09:55
Lab Sample ID: 490-139683-8
Matrix: Water
Client Sample ID: MW-17
Date Collected: 10/26/17 16:05
Date Received: 10/28/17 09:55
Lab Sample ID: 490-139683-9
Matrix: Water
Client Sample ID: Dup-1
Date Collected: 10/26/17 12:00
Date Received: 10/28/17 09:55
Lab Sample ID: 490-139683-10
Matrix: Water
Total/NA Analysis 8260B 1 10 mL 10 mL 472175 10/31/17 14:05 RP TAL NSH
Batch Batch Di l initial Final Batch Prepared
Prep Type Type Method Run Factor Amount Amount Number or Analyzed Analyst Lab
Batch Batch Dil Initial Final Batch Prepared
Prep Type Type Method Run Factor Amount Amount Number or Analyzed Analyst Lab
Total/NA Analysis 60e 1 10 mL 10 mL 472175 10/31/17 16:42 RP TAL NSH
Batch Batch Dil Initial Final Batch Prepared
Prep Type Type Method Run Factor Amount Amount Number or Analyzed Analyst Lab
Total/NA Analysis 8260B 1 10 mL 10 mL 472175 10/31/17 16:16 RP TAL NSH
Batch Batch Dil Initial Final Batch Prepared
Prep Type Type Method Run Factor Amount Amount Number or Analyzed Analyst Lab
Total/NA Analysis eaoB 1 10 mL 10 mL 472175 10/31/17 14:31 RP TAL NSH
Lab Chronicle
Client: Tetra Tech GEO TestAmerica Job ID: 490-139683-1
Project/Site: Sigurd, UT
Client Sample ID: Trip Blank Lab Sample ID: 490-139683-11
Date Collected: 10/26/17 00:01 Matrix: Water
Date Received: 10/28/17 09:55
Batch Batch Dil Initial Final Batch Prepared
Prep Type Type Method Run Factor Amount Amount Number or Analyzed Analyst Lab
TotaVNA Analysis 8260B 1 10 mL 10 mL 472175 10/31/17 12:19 RP TAL NSH
Laboratory References:
TAL NSH = TestAmerica Nashville, 2960 Foster Creighton Dnve, Nashville, TN 37204, TEL [phone]
TestAmerica Nashville
Page 21 of 26 11/1/2017
Method Summary
Client: Tetra Tech GEO TestAmerica Job ID: 490-139683-1
Project/Site: Sigurd, UT
Method Method Description

Protocol Laboratory

8260B Volatile Organic Compounds (GC/MS) SW846 TAL NSH
Protocol References:
5W846 = 'Test Methods For Evaluating Solid Waste, Physical/Chemical Methods", Third Ecition, November 1986 And lts Updates.
Laboratory References:
TAL NSH = TestAmerica Nashville, 2960 Foster Creighton Drive, Nashville, TN 37204, TEL [phone]
TestAmerica Nashville
Page 22 of 26 11/1/2017
Accreditation/Certification Summary
Client: Tetra Tech GEO TestAmerica Job ID: 490-139683-1
Project/Site: Sigurd, UT
Laboratory: TestAmerica Nashville
The accredita tons/certifications listed below are applicable to this report
[Authority Program EPA Region Identification Number Expiration Date
Utah NELAP a TN00032 07-31-18
•
TestAmerica Nashville
Page 23 of 26 11/1/2017
(ffgrh10...NA
YES...NO..

TestAmerica

THE LEADER IN ENVIRONMENTAL TESTING
Nashville, TN

COOLER RECEIrr FORM _ 490 139683 Chen of Custody - - - -
Cooler Received/Opened On 10128/2017 42/..18_5_5_
Tithe Samples Removed From Cooler t Time Samples Placed in Storage (2 Hour Window)
1. Tracking*? 1:1,24, (last 4 digits, FedEx) Courier. FedEx
IR Gun ID Ramer pH Strip Lot ...•4(4— Chlorine Ship L
2. Ternperature of rep. sample or temp blank when opened: Lt3 _Degrees Celsius
3. if *ern #2 temperature fit 0°C or less, was the representative sample or temp blank frozen? YES Nale
4. Were custody seals on outside of cooler'?
If yes, how many and where:
5. Were the seals intact, signed, and dated correctly?
Were custody papers Inside cooler'?
j codify that I canned the cooler and anewergl tiuesV_ons 14)Jitt1kh
7. Were custody seals on containers: 6.9 erk:43.1.rci intact
Were these signed and dated correctly? (Oklk V.NO
8. Packing marl used? Itile";—"Jra) Plastic bag Peanuts Vermiculite Foam insert Paper Other None
9. Cooling process: Ice-peck ice (direct contact) Dry los Other Sione
10. Did all containers arrive In good condition (unbroken)?
11. Wet)e all container labels complete (#, date, signed, pros., etc)?
12. Did all container labels and tags agree with custody papers?
13a. Were VOA vials received?
b. Was there any observable headspace present In any VOA Vial?
Offl..NO... NA
.651.140...NA

41'74(17
• fig Larger than this.
14. Was there a Trip Blank In this cooler? YES. A If muttiple coolers, sequence #
I certify thg) unloggled tile cooler Inct ansvertd auestlons 7-14 (Intel) -4f4-
15a. On pres'd bottles, cid pii test strips suggest preservation reached the correct pH level? YES...NO6P
(roe- 61..NO...NA
...NO...NA
b. Dki the bottliklabels Indcate that the correct preservatives were used
16. Was residual chlorine present?
I certify that! checked tor chlorine and pH as Per SOP and answered tteesgone.15-46 (049
17. Were custody Papers Properly filled out (Ink, signed, etc)?
18. Did you sign the custody papers in the appropriate (dace?
19. Wore correct containers used for the analysis requested?
20. Was sufficient amount of sample sent in each contalner?
I certify Mat I entered this protect into LIMB and answered questions 17-20 (iella)
i certify that I attached a rebel with the unique likis number to each container lintel)
21. Were there Non-Conformanco Issues at logIn?c73,10 Was a NCR* generated?
BIS Broken in shipment
Cooler Receipt Form.don LF-1 End of Form Revbied W2'3/17
Page 24 of 26 11/1/2017'
MI NM =I MN =I MEN MN INN NM NM MN NMI NM I= 111•11 =II NM
TestAmerica Nashville
290C Foster Orephmn Drive NashivItis TN 37204
Phone (615) 72e-3177 Fax ela 726-3404 Chain of Custody Record TesiAmerica
r 04 tyy.10.1...NV .t
Client information Sampler. cb, /...jr, 4.61b Pta Hayes, Hen Carer Tra:RiA Iwo WC lin'
490-74594-227681
Page Page 1 012 C,Ilent acne= Dr. Scutt Simpson . . eZli--3‘04/ ..106, 4 -Mat keitheyes testamencamc.ccm Compeer, Tema Tech GEO Analysts Requested Joh*
Aarsta '.165 SarctUary Parkway Sik.e 270 ow Date Reeeested ,
.
*
r
i5'
1
a
• IS
6 2
e
op
. .. ,
' ... . . ' 3
, 1:
15 S
I.•
Preveread(te Code&
A -1-0L M - Hwile
B As01- N - Nene C . >en Acwiate 0 -AsNa02 0 - VAC Acld P - I...4204E F - &WON 0 - NeM03
F •14eCH R - Na2S203 5 . Arrhim. 9 --rno4 1-1 Ascerbie ?ad - TSP Delecareelrate 1-1c* U -Acatme J - Ca odatur V- MCM K -EDTA VI pH 4.6 . -EDA z -carer 'Neely)
other
NV: Alpharetta'
TAT Requested (dem:
,5-74^417114. A 0 'TAFT' State Zigr
GA 0009 3
Phu.: 770-619-9650(Te ) .'" * Purchase Order ReauesMci
Email' scott [e-mail] WO 5
WOO= MAW StgLIMI, ,JT .rupv.lit e900 7790
Sea. atom
'Veda! Matra? none/Note! .. 2.1=4.e ntificatinn Sample Date Sample Ti me

Sample i matrix TyPe ; (C.vornp..1 a...Z:71 G=grabs) • 111.11m., C - 'PeeseMitate Cade,. A 'A ---.—. . ........a
/11‘ Irlf — 4/. if:12/7 //CV di of i Water •
Al 14/ —5 /0/207 6145 61w w" j LoG: 490 Arl Vii— 41 /0 12-a7 //91-6- Gui Water r‘,
139683 Al /14/ — 7 /0/21,17 I3Yo cio Wate X ,k,/,,, /5, nv Water XJ
i XS" ._• INate r
3 M Pt/ — 0 104a7 00.5 610 , Wate^
All/1/ —PC * /6/7-0)? ObA Li tAi Water Xj
/VI 1A/— /7 ,/04/7 4,04. CiW Water
Alz447 /2610 CAW • water 1
1 Water
.4 Possibie Hazard Identification 7.7 — F-1 Aron-Harem' Mamma,* =I Ain brdant Pokon B C:3 Unlmcht.1 Radloicomal
Sample Disposal (A fee may be assessed ff samples are retsined longer than 1 month) LJ a Renim To Can! LDJsposal Sy Lab Archii,e Fr Months
Deliverable Requested* 1, II, III, IV. Other (speciy) Special Instuctione/QC Recurements•
Empty Kit lie inquishec by: Date. Tme: roc of akiereset
ReLnqr.iteltd I DateiTrie , ,C
) / 1
erfu:
0 27
Received .. me
P.efriquermd by: ,C Date'll ne. Corr b•
Reireeirlee by ,IDEtmlime leoace^y
I_
Received br /, 4Balrie.
I
Caepany
Gtrateldy Seas lntect [kelp* Seal WI'
Ayes A NO l
0.e.terTentperauire(s; 'Card 00-Ar lenarks: 0'3 Vcr 061042016
Login Sample Receipt Checklist
Client: Tetra Tech GEO Job Number: 490-139683-1
Login Number: 139683 List Source: TestAmerica Nashville
List Number: 1
Creator: Huskey, Adam
Question Answer Comment
Radioactivity wasn't checked or is </= background as measured by a survey True
meter.
The cooler's custody seal, if present, is intact True
Sample custody seals, if present, are intact. N/A
The cooler or samples do not appear to have been compromised or True
tampered with.
Samples were received on ice. True
Cooler Temperature is acceptable. True
Cooler Temperature is recorded. True
COC is present. True
COC is filled out in ink and legible. True
COC is filled out with all pertinent information. True
Is the Field Sampler's name present on COC? True
There are no discrepancies between the containers received and the COC. True
Samples are received within Holding Time (excluding tests with immediate True
HTs)
Sample contahers have legible labels. True
Containers are not broken or leaking. True
Sample collection date/times are provided. True
Appropriate sample containers are used. True
Sample bottles are completely filled. True
Sample Preservation Verified. N/A
There is sufficient vol. for all requested analyses, incl. any requested True
MS/MSDs
Containers requiring zero headspace have no headspace or bubble is False Headspace larger than 1/4".
<6mm (1/4").
Multiphasic samples are not present True
Samples do not require splitting or com positing. True
Residual Chlorine Checked. N/A
TestAmerica Nashville Page 26 of 26 11/1/2017
2017 Grouldwater Monitonng Report
Georgia-Pacific Former Gypsum Manufacturing Facility
APPENDIX B.
HISTORICAL MEASURED GROUNDWATER
CONCENTRATIONS
April 13, 2018 TETRA TECH
1
Table 3 Groundwater Sam piing Results
Parameter TPH - Oil & Grease TPH (GC/FID) High Fraction 8260B Detections
Units rng/l mg/l me
Method 1664A 3510C/ DRO 826013
Client
Sample ID
Collect
Date Value ISL Tier 1 Value ISL Tier 1 Parameter Value MCL ISL Tier 1
GW-MW2 22FT 5/4/2011 NM 10 10 ND 1 10 ND
GW-MW3 22FT 5/4/2011 ND 10 10 ND 1 10 ND
GW-MW4 20 FT 5/5/2011 NM 10 10 ND 1 10 ND
GW-MW5 11 FT 5/5/2011 NM 10 10 0.23 1 10 ND
GW-MW6 22 FT 5/5/2011 ND 10 10 1 10 NM
GW-51 25 FT 5/3/2011 430 10 10 N M 1 10
n-Butylbenzene 0.027
sec-Butylbenzene 0.057
tert-Butylbenzene 0.1319
Ethylbenzene 0.0024 0.7 0 7 4
l sop ropylbenzen e 0.0059
p-lscpropyltoluene 0036
Naphthalene 0.04 07 o 7
n-Pr opylbenz en e 0014
1,2,4-Trimethyibenzene 0.11
1,2,3-Tri methylb en ze ne 0.039
Xyle nes, Total 0.003 10 10 10
W- G13.2 25 FT 5/3/2011 410 10 10 N M 1 10
Benzene 0.002 0.005 acos 03
n-Butylbenzene 0.11017
Ethylbenzene 0.0(126 0.7 0.7 4
4-Methyt-2-pentanone (MlBK) 0.024
Methyl tert-butyl ether 0.001.2 0.2 az
n-Prcpylbenz en e 0.0021
1,2,4-Trimethyl b en ze ne 0.012
1,2,3-Trimethyl b en ze ne 0.0015
13,5-Tri methyl b en ze ne 0.0045
Xylenes, Total 0.017 10 10 10
GW-B3 25 FT 5/3/2011 440 10 10 NM 1 10
n-Butylbenzene 0.0011
sec-Butylbenzene 0.001
Ethylbenzene 0.0028 07 a7 4
1,2,4-Trimethyl b en ze ne 0.0097
12,3-Thmethyl b en ze ne 0.0029
13,5-Trimethyi b en ze ne 0.0033
Xylenes, Total 0.0056 10 10 10
OW-B4 25 FT 5/3/2011 ND 10 10 N M 1 10 ND
GW-B5 25 FT 5/3/2011 140 10 10 N M i 10
Ethyl b enzene 0.0014 G7 0.7 4
1,2,4-Tnmethy1b en ze ne 0.0047
1,23-Trimethyib en ze ne 0.0015
1,3,5-Trimethylb en ze ne 0.0017
Xylenes, Total 0.0E03 10 10 10
GW-B625 FT 5/3/2011 ND 10 10 N M 1 10 sec-Butylbenzene 0.001
Xylenes, Total 0.0053 10 10 10
GW-B725 FT 5/3/2011 NM 10 10 32 1 10
Benzene 0.0071 0.005 0.035 03
n-Butylbenzene 0.0059
sec-B utyl b en zene 0.0078
Ethylbenzene 0.043 0.7 0 7 4
l sopropyl b en zene 0.012
p-lsoprcpyltoluene 0.0071
Naphthalene 0.17 0.7 0.7
n-Prcpylbenzene 0.019
1,2,4-Trimethyl b en ze ne 0.19
1,2,3-Trimethylb en ze ne 0.1
1,3,5-Trirnethy1b en ze ne 0.03
Xylenes, Total 0.24 10 10 10
GW-13825 FT 5/4/2011 NM 10 10 ND 1 10 Nro
GW-B925 FT 5/4/2011 ND 10 10 NM 1 10 ND
GW-B1025 FT 5/4/2011 NM 10 10 ND 1 10 ND
GW-B12 22FT 5/4/2011 NM 10 10 ND i 10 ND
GW-B13 22FT 5/4/2011 ND 10 10 N M 1 10 ND
GW-B1622 FT 5/5/2011 NM
98
10
10
10
10
N M
Nrvl
1
1
10
10
n-Butylbenzene 11018
sec-Butylb en zen e 0.022
Ethylbenzene 0.038 0 7 0.7 4
Isopropyl b en zen e 0.016
p-lscpropyltoluene 0.047
Naphthalene 0.32 0.7 07
n-Prcpylbenzene 0.031
1,2,4-Trimethyl b en ze ne 0.3
1,23-Trimethyib en ze ne 0.13
1,3,5-Trimethylb en ze ne 0.12
Xylenes, Total
n-Butylbenzene
0.21
0.0037
10 10 10
GW-B18 19 FT 5/5/2011
sec-Butylbenzene 0.012
tert-Butylbenzene 0.01
Ethylb en zene 0.001.4 0.7 0.7 4
lsopropylbenzene 0.001.8
n-Prcpylbenzene 0.0027
GW-DUP02
MW9
B30
08-Dec-12
GW-MW11
MW11
B38
09-Dec-12
GW-DUP03
MW11
B38
09-Dec-12
GW-MW12
MW12
B33
09-Dec-12
3.8 J ND
0.34 J ND
4.14 J
1
ND
Diesel No Pattern
ND
ND
ND
No Pattern
ND
0.78 J
0.78 J
Oil
0.4 J I
ND
1.8
ND
ND
ND
3.1
ND
ND
ND
ND
ND
ND
0.37 J
ND
ND
ND
ND
ND
ND
0.69 J
ND
ND
ND
0.58 J
ND
0.58 J
0.86 J
Table 5.1
Laboratory Analytical Results - Water (TPH-DRO and VOCs)
GP Gypsum Phase!! Site Investigation
Sample ID GW-MW2 GW-MW3 GW-MW4 GW-MW6 GW-MW7 GW-MW8 GW-MW9
Monitoring Well ID MW2 MW3 MW4 MW6 MW7 MW8 MW9
Boring ID B11 B10 B17 B21 B25 B28 B30
Sample Date 08-Dec-12 09-Dec-12 08-Dec-12 09-Dec-12 08-Dec-12 08-Dec-12 08-Dec-12
Analyte Units ISLI Tier 1'
C10-C20 MG/L No ISL No Tier 1 ND ND ND ND 9.4 0.57 J 9.6 J
C20-C28 MG/L No ISL No Tier 1 ND ND ND ND 1.1 ND 1 J
Total TPH-DRO2 MG/L 1 10 ND ND ND ND 10.5 0.57 10.6 J
Pattern3 No Pattern No Pattern No Pattern No Pattern Diesel No Pattern Diesel
EPA RSL -
Tapwater MCL
BENZENE UG/L 0.39 5 0.31 J ND ND ND ND ND 0.64 J
TOLUENE UG/L 860 1000 ND ND 0.31 J ND ND ND ND l
ETHYLBENZEN UG/L 1.3 40 0.35 J 0.4 J ND ND 5.8 0.36 J 2.8 l
M+P-XYLENE UG/L 1904 No MCL 0.76 J 0.84 J ND ND ND ND ND
O-XYLENE UG/L 190 No MCL ND ND ND ND 1.1 ND ND
TOTAL XYLENE UG/L 190 10000 0.76 0.84 ND ND 1.1 ND ND
NAPHTHALENE UG/L 0.14 No MCL 0.81 J 1.1 ND 0.32 J 26 0.66 J 4.6
Sample ID
Monitoring Well ID
Boring ID
Sample Date
Analyte
C10-C20
C20-C28
Units
MG/L
MG/L
!SC
No ISL
No ISL
Tier 12
No Tier 1
No Tier 1
GW-MW13
MW13
B35
08-Dec-12
13
2
GW-MW14
MW14
B40
09-Dec-12
ND
ND
GW-MW16
MW16
B42
17-Dec-12
ND
ND
GW-DUP04
MW16
B42
17-Dec-12
ND
ND
GW-MW17
MW17
B43
08-Dec-12
1.7 J
0.21 J
GW-B26
NA
B26
07-Dec-12
ND
ND
GW-B27
NA
B27
06-Dec-12
ND
0.2 J
GW-B34
NA
B34
06-Dec-12
9.3 J
4 J
GW-B36
NA
B36
07-Dec-12
200 J
19 J
GW-B37
NA
B37
06-Dec-12
77 J
11 J
Total TPH-DRO3 MG/L 1 10 /5 ND ND ND j 1.91 J l ND 0.2 13.3 J l 219 J l 88 J
Pattern
EPA RSL -
Tapwater MCL
Diesel No Pattern No Pattern No Pattern Diesel No Pattern No Pattern Diesel and
Oil
Diesel and
Oil Diesel
BENZENE UG/L 0.39 5 27 ND 0.37 J 0.31 J l 0.43 J l 0.32 J ND l 0.43 J 0.47 J 0.43 J
TOLUENE
ETHYLBENZENE
M+P-XYLENE
O-XYLENE
TOTAL XYLENEE
UG/L
UG/L
UG/L
UG/L
UG/L
860
1.3
1904
190
190
1000
40
No MCL
No MCL
10000
ND ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND 0.31 J

0.64 J ND

0.36 J ND
ND ND

0.36 J ND
ND
ND
ND
ND
ND
0.32 J
ND
ND
ND
ND
0.36 J ND
1.1
1.1
0.43 J
1.53
63 11
140
9.8
149.8
0.34 J
2.3
2.64
NAPHTHALENE UG/L 0.14 No MCL 120 l 0.72 J l ND ND l 3.3 l ND l ND ND l 6.4 l 3.6
Notes:
Only groundwater samples with at least one detection are listed
1 - Levels typically used by the DMsion of Response and Remediation (DERR) to evaluate petroleum hydrocarbon releases from underground storage tanks. These values are presented to provide an
approximate cleanup goal for reference purposes only.
2 - Sum of C10-C20 and C20-C28 ranges
3 - As reported by ALS Environmental
4 - RSL for m-xylene and p-xylene
J - Estimated Value
EPA RSL - Environmental Protection Agency Regional Screening Level
BOLD -Value exceeds ISL or EPA tapwater RSL
-Value exceeds Tier 1 level or EPA MCL IALIC
MN NMI I= MI MN =I I= NM NM NM NM in MI MI MOM— NM NM
Table 5.2
Laboratory Analytical Results - Water (SVOCs)
GP Gypsum Phase II Site Investigation
sample ID GW-MW7 GW- MW8 GW -MW9 GW-DUP 02 GW-MW13 GW- MW17
Monitoring Well ID MW7 MW8 MW9 MW9 MW13 MW17
Boring ID B25 B28 B30 B30 B35 B43
Sample Date 08- Dec- 12 08-Dec- 12 08 -Dec-12 08- Dec- 12 08-Dec- 12 08-Dec-12
Analyte Units EPA RSL -
Tapwater MCL
1,1'-BIPHENYL UG/L 0.83 No MCL 18 14 J I 21 I 19 29 11 J
2,4-DIMETHYLPHENOL UGIL 270 No MCL ND ND ND ND 3.3 J ND
2-METHYLNAPHTHALENE UG/L 27 No MCL 57 ND 8.1 7.4 r 110 19 J
ACENAPHTHENE UG/L 400 No MCL 9 3.3 J 8.9 7.8 8.6 6.1 J
ANTHRACENE UG/L 1300 No MCL ND ND 3.3 J ND ND ND
BENZALDEHYDE UG/L 1500 No MCL 18 ND ND ND ND ND
CARBAZOLE UG/L No RSL No MCL ND ND ND ND 14 ND
DIBENZOFURAN UG/L 5.8 No MCL 6.4 ND 5.6 4.8 ND 3.7 J
DIETHYL PHTHALATE UG/L 11000 No MCL ND ND ND ND 7.5 ND
FLUORENE UG/L 220 No MCL 15 6.3 J 13 12 15 11 J
NAPHTHALENE UG/L 0.14 No MCL 29 ND ND ND l 110 ND
PHENANTHRENE UG/L No RSL No MCL 20 9.2 J 23 17 17 23 J
Notes:
Only groundwater samples with at least one detection are listed
Only analytes detected in at least one groundwater sample are listed.
J - Estimated Value
EPA RSL - Environmental Protection Agency Regional Screening Level
Primary MCL - National Primary Drinking Water Maximum Contaminant Level
BOLD - Value exceeds EPA Tapwater RSL
BOLD
Notes:
J - Estimated Value
EPA RSL - Environmental Protection Agency Regional Screening Level
Primary MCL - National Primary Drinking Water Maximum Contaminant Level
1 - Chromium RSL is for Chromium III
2 - Chromium MCL is for Total Chromium
3 - National Secondary Drinking Water (NSDW) Standard
- Value exceeds MCL
- Value exceeds NSDW Standard
Table 5.3
Laboratory Analytical Results - Water (Metals)
GP Gypsum Phase II Site Investigation
Sample ID GW-MW11 GW-DUP03 GW-MW12 GW-MW13
Monitoring Well ID MW11 MW11 MW12 MW13
Boring ID B38 B38 B33 B35
Sample Date 09-Dec-12 09-Dec-12 09-Dec-12 08-Dec-12
Analyte Units MCL
ALUMINUM UG/L 50-200J 1200 I 270 ' 190 J 800
ANTIMONY UG/L 6 ND ND ND ND
ARSENIC UG/L 10 ND 7 J 14 7.2 J
BARIUM UG/L 2000 58 J 27 J 31 J 160
BERYLLIUM UG/L 4 ND ND ND ND
CADMIUM UG/L 5 ND ND ND ND
CALCIUM UG/L No MCL 110000 100000 32000 340000
CHROMIUM UG/L 1002 ND ND ND 0.81 J
COBALT UG/L No MCL ND ND ND ND
COPPER UG/L 1300 ND ND ND ND
IRON UG/L 300 840 I 240 170 l 8000
LEAD UG/L 15 1.4 J 0.99 J ND ND
MAGNESIUM UG/L No MCL 28000 26000 8100 110000
MANGANESE UG/L 504 72 1 44 8.8 J 870
NICKEL UG/L No MCL ND ND ND 2.4 J
POTASSIUM UG/L No MCL 4800 J 4100 2800 14000
SELENIUM UG/L 50 ND ND ND ND
SILVER UG/L 0.13 ND ND ND ND
SODIUM UG/L No MCL 82000 79000 89000 600000
THALLIUM UG/L 2 ND ND ND ND
VANADIUM UG/L No MCL 12 12 19 2.6 J
ZINC UG/L 50003 ND ND ND 8.2 J
MERCURY UG/L 2 ND ND ND ND
ITALIC
1
1
1
I
I
I
l
i
1
I
1
I
1
I
i
I
i
1
1
Table 2
LaboratOry Analytical Res ullS
GP Gypsum GroundWater Monitoring
Sample ID GW-MW2 GW- MW2 OAQC #2 MW-2 MW-24 GW-MW5 GVV- MW5 MW-5 MW-5` GW-MW6 GW- MW6 MW-6 MW-64
tvlonitoring Well ID MW2 MW2 MW 2 MW2 MW 2 MWS MW5 MW5 MW5 MW6 MW6 MW6 MW6
Sample Date
Ana lyte Units lSLi Tier J.'
8-Dec-12 3 0-May-14 30-May-14 29-Oct-14 29-Oct-14 8-D e c-12 29-May-14 29-Oct-14 29-Oct-14 9-Dec-12 30-May-14 30-Oct-14 300ct-14
C10-C20 rng/L No ISL No Tier 1 ND ND ND ND ND 0 24 1 Q705 ND ND ND
C20-C28 rng/L No ISL No Tier 1 ND ND ND ND ND ND Q138 ND ND ND
Total TPH-DRO2 mg/L 1 10 ND ND ND ND ND Q24 (1843 ND ND ND
Patter ni No Pattern No Pattern No Pattern No Pattern No Pattern No Pattern Diesel N o Pattern No Pattern N o Pattern
EPA FS L -
VOCS Ta pwater Primary MCL
BENZENE pg/L Q39 5 a31 .1 ND ND ND ND ND ND ND ND ND
TOLUENE pg/L 860 1C00 ND ND Q31 1 ND ND ND ND ND ND ND
ETHYLBENZENE pg/L 13 40 035 1 ND ND ND ND ND ND ND ND ND
IV14-P -XYLENE pg/L 190 No ma Q 76 1 ND ND ND ND ND ND
O-XYLENE pgfL 190 No ma ND ND ND ND ND ND ND
TOTAL XY LEN E S pg/L 190 10000 -- - ND ND ND ND
NAPHTHALENE pat Q14 No ma 081 .1 0.761 0.57 J ND ND ND ND 0.32J ND ND
SVOCs
2-METHYLNAPHTHALENE
24-DIMETHYLPHENOL
NAPHTHALENE
ACENAPHTHYLENE
ACENAPHTHENE
DIBENZOFURAN
DIETHYL PHTHALATE
FLUORENE
PHENANTHRENE
AN THRACE NE
BIS(2-ETHYLHEXYL)P HTHALATE
BENZALDE HYDE
µg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
pg/L
27
36
Q14
No RSL
4C0
5 8
15C0
220
No RSL
180
5 6
190
No ma
No ma
No ma
No ma
No ma
No Ma
No Ma
No ma
No ma
No Ma
No MCL
No Ma
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
CARBAZOLE
CAPROLACTAM
PYRENE
la-BIPHENYL
µg/L
pg/L
pg,/L
pg/L
No RSL
990
12
Q83
No Ma
No ma
No ma
No ma
ND
ND
ND
ND
ND
ND
ND
ND
METALS
ALUMINUM pg/L 16C00 No Ma 66000 22000 ND ND 19000 ND ND 260000 ND ND
ANTIMONY pg/L 6 6 ND 111 ND ND ND ND ND 8 7 I ND ND
ARSENIC pet 0 045 10 34 95 13.4 16.8 19 ND 10 2 97 ND ND
BARIUM pg/L 380 20 860 3900 307 32 4 470 37 9 39 8 9600 24 1 25 1
BERYLLIUM µg/L 2 5 4 43 1 17 ND ND 1.61 ND ND 16 ND ND
CADMIUM pg/L 6 9 5 ND ND ND ND ND ND ND ND ND ND
CALCIUM pg/L No RSL No ma 290000 44000 36803 35300 670000 372000 367003 1900000 529C0 51500
CHROMIUM µg/L No RSL 100 100 410 ND ND /4 ND ND 270 ND ND
COBALT pat 4 7 No Ma 20 SO ND ND 71 ND ND 110 ND ND
COPPER pg/L 620 1300 65 290 ND ND 10 ND ND 300 ND ND
RON µg/L 11C00 No Ma 56000 230000 ND ND 18000 963 980 220000 ND ND
LEAD µg/L No RSL 15 41 130 ND ND 22 ND ND 140 ND ND
MAGNESIUM µg/L No RSL No Ma 48000 190000 9950 993 0 46000 172C0 17700 200000 13903 13903
MANGANESE µg,/L 320 No Ma 1300 6200 ND ND 2100 341 334 7600 ND ND
NICKEL pg/L 3 CO No Ma 39 160 ND ND 5 1 ND ND 150 ND ND
POTASS UM pg/L No RSL No ma 28000 88000 313 0 3340 31000 22703 23800 89000 3010 3190
SELENIUM µg/L 78 50 ND ND ND ND ND ND ND ND ND ND
SILVER µg/L 9 4 No Ma ND ND ND ND ND ND ND ND ND ND
SODIUM µg/L No RSL No Ma 12000) 150000 114000 11SOCO 140000 223030 223003 130000 112C00 112000
THALLIUM pg/L (116 2 44 3 8181 ND ND 631 ND ND ND ND ND
VANADIUM pet 78 No ma 140 480 26 4 29 8 50 ND ND 470 ND ND
ZINC pg/L 47C0 No ma 170 .760 ND ND 52 ND ND 580 AID ND
MERCURY µg/L (163 2 ND 0153 ND ND ND ND ND 0.15 .1 ND ND
Notes
Only analytes detected in at least one well are hsted
1 - Levels typically used by the Division of Response and Remediation (DERR) to
evaluate petroleum hydrocarbon releases from underground storage tanks
These values are presented to provide an approximate cleanup goal for
reference purposes onty
2 - Sum of C10-C20 and C20-C28 ranges
3 -As reported by ALS Environmental
4 - Samples were field filtered. all other samples were unfiltered
J - Estimated Value - Result is less than the reporting limit but greater than the method ddection limit (MOL)
EPA RSL - Environmental Protection Agency Regional Screening Level
BOLD
BOLD ITALIC
BLUE R-AUG
-Value exceeds ISL or EPA tapwater RSL
-Value exceeds Tier 1 level or EPA MCL
- May 201 4 metals concentrations were
anomalously high in general compared to
prior and later (Oct 2014) concentrations
Therefore. May metals concentrahors are
deem ed unrepresentatne of site conditions
Table 2
Laboratory Analytical Results
GP Gypsum Groundwater Monitoring
Sample ID
Monitoring Well ID
Sample Date
Ana lyte Units ISL.' Tier 1'
C10-C20 rng/L No ISL No Tier 1
C20-C28 rng/L No ISL No Tier 1
Total 1PH-DRO2 rng/L 1 10
Pattern'
EPA R5L-
VOCS Ta parater Primary MCL
BENZENE pg/L Q39 5
TOLUENE pg/L 860 1000
ETHYLBENZENE pg/L 1 3 40
M-I-P-XYLENE pg/L 190 No ma
O-XYLENE pg/L 190 No ma
TOTAL XYLEN ES pg/L 190 10000
NAPHTHALENE pg/L 014 No ma
SV005',
2-METHYLNAPHTHALENE pg/L 27 No MCI.
Z4DIMETHYLPHENOL pg/L 36 No ma
NAPHTHALENE pg/L 014 No ma
ACENAPHTHYLENE pg/L No RSL No ma
ACENAPHTHENE pg/L 403 No MCL
DIBENZOFURAN pg/L 5 8 No ma
DIETHYL PHTHALATE pg/L 1500 No ma
FLUORENE pg/L 220 No ma
PHENANTHRENE pg/L No RSL No MCL
ANTHRACE NE pg/L 180 No ma
1315(2-ET HYLHEXYL)PHTHALAT E pg/L 5 6 No MCL
BENZALDE HYDE pg/L 190 No ma
CARBAZOLE pg/L No RSL No ma
CAPROLACTAM pg/L 990 No MCL
PYRENE pg/L 12 No ma
1,1-BIPHENYL pg/L 083 No ma
METAIS
ALUMINUM pg/L 16030 No ma
ANTIMONY pg/L 6 6
ARSENIC pg/L 0 045 10
BARIUM pg/L 380 2030
BERYLLIUM pg/L 2 5 4
CADMIUM pg,/L 6 9 5
CALCIUM pg,/L No RSL No ma
CHROMIUM pg/L No RSL 100
COBALT pg/L 4 7 No MCL
COPPER pg/L 620 1300
IRON pg/L 11030 No MCL
LEAD pg/L No RSL 15
MAGNESIUM pg/L No RSL No MCL
MANGANESE pg,/L 320 No ma
NICKEL pg/L 303 No MCL
POTASSIUM pgJL No RSL No ma
SELENIUM pg/L 78 50
SILVER pg/L 9 4 No ma
SODIUM pg/L No RSL No ma
THALLIUM µg/L 016 2
VANADIUM pg/L 78 No MCL
ZINC pg/L 4703 No MCL
MERCURY ;Agit 063 2
GW-MW7 GW-MW7 (0111-7 MW-7' GW-MW8 GW-MW9 GW-DUP02 GW -MW9 ()AOC #1 MW-9 OACtC#1 MW-94 OA QC #1` GW-MW11 GW-DU KB GW -MW11 MW-11 MW-11'
MW7 MW7 MW7 MW7 MW8 MW9 MW9 MW 9 MW9 MW9 MW9 MW9 MW9 MW11 MW11 MW11 MW11 MW11
8-Dec-12 29-May-14 30-Oct-14 3 0-Oct-14 8-Dec-12 8-Dec-12 9-Dec-12 29-May-14 29-May-14 29-Oct-14 29-Oct-14 29-Oct-14 29-Oct-14 9-Dec-12 9-Dec-12 30-May-14 29-Oct-14 29-Oct-14
9 4 5 3 49 0 57 1 9 6 3 8
. ,
2 6 3 1
.
12 25 8 ND ND ND ND
1 1 0 83 0 305 ND 1 0 34 1 045 J 0 54 J 1 04 1 9 ND ND ND ND
20.5 5.83 3.795 057 10.6 4.14 3.05 3.64 1104 27.7 ND ND ND ND
Diesel Diesel Diesel No Pattern Diesel Diesel Diesel Diesel Diesel Diesel No Pattern No Pattern No Pattern NoPattern
ND ND ND ND 0.641 0.4.1 ND ND ND ND ND ND ND ND
ND ND ND ND ND ND ND ND ND ND ND ND 0 31 1 ND
5.8 3.9 2.51 036 1 2.8 18 093 1 0 93 1 ND ND ND ND ND ND
ND ND ND ND ND ND ND -- - ND ND ND --
1 1 0 521 ND ND ND ND ND -- - ND ND ND --
0 52 ND ND -- -- ND ND ND -- -- -- ND
26 22 ND 0.66 .1 4.6 3.1 3.8 4.1 ND ND 0.37 I 0.69 I ND ND
57 6 4 3 13 ND 8 1 7 4 ND ND ND ND ND ND ND ND
ND ND ND ND ND ND ND ND ND ND ND ND ND ND
ND ND ND ND ND ND ND ND ND ND ND ND ND ND
ND ND ND ND ND ND ND ND 5 6 ND ND ND ND ND
9 ND 53 3 3 1 8 9 7 8 ND 8 1 309 13 4 ND ND ND ND
6.4 3 81 ND ND 5 6 4 8 ND ND ND ND ND ND ND ND
ND ND ND ND ND ND ND ND ND ND ND ND ND ND
15 22 9 17 6 3 13 12 19 10 ND 25 7 ND ND ND ND
20 39 4 17 9 2 23 17 16 8 147 34 4 ND ND ND ND
ND 9 6 ND ND 3 3 1 ND 3 11 ND 6 34 ND ND ND ND ND
ND ND 11.7 ND ND ND ND ND 11.5 ND ND ND ND ND
18 ND ND ND ND ND ND ND ND ND ND ND ND ND
ND ND ND ND ND ND ND ND ND ND ND ND ND ND
ND ND ND ND ND ND ND ND 180 ND ND ND ND ND
ND ND ND ND ND ND ND 7 39 2 17 ND ND ND ND
18 ND ND 14 21 19 ND ND 32.1 133 ND ND ND ND
26000 ND ND 4600 /.1000 ND ND ND ND 1200 270 280000 1970 588
ND ND ND NO NO ND ND ND ND ND ND 8.71 ND ND
12 ND ND ND NO ND ND ND ND ND 76 90 ND 10.2
1400 467 487 19 0 4 60 60 2 62 5 63 3 61 9 58 1 2713 12000 71 4 33 9
1.8 ND ND NO ND ND ND ND ND ND ND 19 ND fJD
ND ND ND ND ND ND ND ND ND ND ND ND 1 ND
130000 27700 26703 /90000 230000 85203 83503 84300 87103 nom) mocoo 30c12000 191000 19COCO
28 ND ND 62 1 12 ND ND ND ND ND ND 290 ND ND
9.5 1 ND ND 150 1.71 ND ND ND ND ND ND 85 ND ND
29 ND ND ND 9.2 i ND ND ND ND ND ND 310 ND ND
22000 ND ND 4 600 9500 1060 113 0 1060 1100 840 240 240000 1310 517
28 ND 6.9 14 ND 1170 ND ND 1 4 .1 0998 140 ND ND
39 X0 21100 21103 67000 73000 48400 48600 49000 50103 28000 26000 220000 47100 47700
620 70 6 663 430 550 820 300 310 327 72 44 6600 302 26 4
161 ND ND .181 8.21 ND ND ND ND ND ND 140 ND ND
17000 3720 3 870 7300 10000 4620 4660 4840 4790 4800 4100 120000 5080 4720
ND ND ND ND ND ND ND ND ND ND ND NO ND ND
ND ND ND ND ND ND ND ND ND ND ND ND ND ND
350000 333 OM 333000 220000 220700 273000 276000 274000 284000 82030 79000 110000 96300 97600
ND ND ND NO ND ' ND ND ND ND ND ND ND ND ND
57 ND ND 101 22 ND ND ND ND 12 12 480 ND ND
65 ND ND 151 22 ND ND ND ND ND ND 610 ND ND
ND ND ND ND ND ND ND ND ND ND ND 0072 1 ND ND
Notes
Only analytes detected in at least one well are hsted
1 - Levels typically used by the Division of Response and Remediation (DER R) to
evaluate petroleum hydrocarbon releases from underground storage tanks
These values are pres ented to provide an approximate cleanup goal f or
reference purposes only
2 - Sum of C10-C20 and C20-C28 ranges
3 - As reported by ALS Environmental
4 - Samples were field filtered. all other samples were unfiltered
J - Estimated Value - R es utt s less than the reporting limit but greater tha ri the
method detection limit (MDL)
EPA RSL - Environmental Protection Agency Regional Screening Level
BOLD -Value exceeds ISL or EPA tapwater RSL
- Value exceeds Tier 1 level or EPA MCL
- May 201 4 metab concentrations were
anomalously high in general cornpared to
prior and later (0 d 2014) concentrations
Therefore. May m etals concentrations are
deemed unrepresentative of site conditions
80L0 ITALIC
LUE 1TAL7C

Table 2
Laboratory Analytical Itesult5
GP Gyp5um Groundwater MOnitOring
Sample ID
Monitoring Well ID
Sample Date
Ana lyte Units is Tier
C10-C20 rrigh No ISL No Tier 1
C20-C28 n1g/L No ISL No Tier 1
Total TPH-DRO' mg/L 1 10
Pattern'
EPA RSL-
VOCs Ta water Primary MCL
BENZENE ugh Q39 5
TOLUENE ug/L 860 1030
ETHYLBENZENE ugh 13 40
-XYLENE ugh 190 No Ma
O-XYLENE pg/L 190 No ma
TOTAL XYLEN ES pg/L 190 10003
NAPHTHALENE ugh 014 No ma
6VOCs ,
2-METHYLNAPHTHALENE pg/L 27 No MCL
Z4-DIMETHYLPHENOL pg/L 36 No ma
NAPHTHALENE pg/L 0.14 No Ma
ACENAPHTHYLENE pg/L No RSL No Ma
ACENAPHTHENE pg/L 400 No ma
DIBEN ZOFURAN pg/L 5 8 No ma
DIETHYL PHTHALATE pg/L 15C0 No Ma
FLUORENE pet. 220 No Ma
PHENANTHRENE pg/L No RSL No Ma
ANTHRACE NE pg/L 180 No ma
BIS(2-ETHYLHEXYL(PHTHALATE pg/L 5 6 No Ma
BENZALDE HYDE pg/L 190 No ma
CARBAZOLE pg,/L No RSL No ma
CAP ROLACTAM pg/L 990 No Ma
PYRENE pg/L 12 No ma 3., r-BIPHENYL pg/L 083 No ma
METALS
ALUMINUM pg/L 16030 No ma
ANTIMONY pg/L 6 6
ARSENIC pg/L 0 045 10
BARIUM pg/L 380 2030
BERYLLIUM pg/L 2 5 4
CADMIUM pg/L 6 9 5
CALCIUM pg/L No RSL No Ma
CHROMIUM pg/L No RSL 100
COBALT pg/L 4 7 No ma
COPPER pg/L 620 1300
IRON ug,/L 11030 No Ma
LEAD pg/L No RSL 15
MAGNESIUM pg/L No RSL No ma
MANGANESE pg/L 320 No Ma
NICKEL pg/L 3 CO No ma
POTASSIUM pg/L No RSL No ma
SELENIUM pie/L 78 50
SILVER pg/L 9 4 No ma
SODIUM pg,/L No RSL No ma
THALLIUM pg/L 016 2
VANADIUM pg/L 78 No ma
ZINC pg/L 4703 No ma
MERCURY pg/L 063 2
Notes
Only analytes detected in at least one well are listed
1 - Levels typically used by the Drii ision of Response and R emediation (DERR) to
evaluate petroleum hydrocarbon releases from underground storage tanks
These values are ores ente d to provide an approximate cleanup goal for
reference purposes only
2 - Sum of C10-C20 and C20-C28 ranges
3 - As reported by ALS Environmental
4 - Samples we re field filtered, all other samples were untittered
J - Estimated Value - Result a less than the reporting limit but greater than the
method detection lim d (MOL)
EPA RSL - Environmental Protection Agency Regional Screening Level
GW-MW12 GW- MW12 MW-12 MW-12` GW-MW13 GW-MW13 MVV-13 MW-13' GW-MW14 GW- MW14 MW-14 MW-14` GW-MW15 GYV -MW15 MW-15 MW-15'
MW12 MW12 MW12 MW12 MW13 MW13 MW13 MW13 MW14 MW14 MW14 MW14 MW15 MW15 MW15 MW15
9-Dec-12 30-May-14 30-Oct-14 3 DOct-14 8-D ec-12 29-May-14 28-Oct-14 28-Oct-14 9-De c-12 29-May-14 29-Oct-14 29-Oct-14 Dec-12 29-May-14 28-Oct-14 28-Oct-14
„
ND ND 0 249 13 4 8 4 42 ND ND ND ND ND ND
078 0481 0 139 2 0 94 0 598 ND ND ND ND ND ND
078 0 48 0 388 .15 5.74 53128 ND ND ND ND ND ND
Mctor Oil No Pattern Diesel Diesel Diesel Diesel No Pattern N o Pattern No Pattern No Pattern No Pattern No Pattern
ND ND ND 27 3.9 6.06 ND ND ND ND ND ND
ND ND ND ND ND ND ND ND ND ND ND ND
ND ND ND 63 7 2 32.7 ND ND ND ND ND ND
Q581 ND 140 2 3 ND ND ND ND
ND ND 9 8 ND ND ND ND ND
Q58 ND 149 8 2 3 4 92 ND ND ND ND
0.86 1 ND ND 120 9.4 8.98 0.721 ND ND ND ND ND
ND ND ND 110 ND ND ND ND ND ND ND ND
ND ND ND 3 3 1 ND ND ND ND ND ND ND ND
ND ND ND ND 9.1 9.79 ND ND ND ND ND ND
ND ND ND ND 4 3 1 2 55 ND ND ND ND ND ND
ND ND ND 8 6 22 12 7 ND ND ND ND ND ND
ND ND ND ND ND ND ND ND ND ND ND ND
ND ND ND 7 5 ND ND ND ND ND ND ND ND
ND ND ND 15 34 20 1 ND ND ND ND ND ND
ND ND ND 17 59 9 47 ND ND ND ND ND ND
ND ND ND ND 7 7 ND ND ND ND ND ND ND
ND ND 13.7 ND ND ND ND AID 212 ND ND ND
ND ND ND ND ND ND ND ND ND ND ND ND
ND ND ND 14 10 ND ND ND ND ND ND ND
ND ND ND ND ND ND ND ND ND ND ND ND
ND ND ND ND 5 1 ND ND ND ND ND ND ND
ND ND ND 29 92 31.7 ND ND ND ND ND ND
190.1 3200 ND ND sco 3 700000 ND ND 750000 ND ND 64000 148 ND
ND ND ND ND ND 77 ND ND 25 ND ND ND ND ND
24 9.6 ND 12.4 7.2 420 ND ND 270 16.2 13.9 32 ND ND
31 1 58 1 31 8 33 2 160 106000 240 253 23000 20 20 8 1500 29 5 25 9
ND ND ND ND ND 120 ND ND 43 ND ND 4.3 1 ND ND
ND ND ND ND ND ND ND ND ND ND ND ND ND
32a)0 38000 33900 33103 340303 11000000 41600 40803 4200000 19703 19030 550G00 6980 71500
ND 4.6 1 ND ND 0 81 1 2000 ND ND 890 ND ND 53 ND ND
ND ND ND ND ND 780 ND ND 210 ND ND 18 ND ND
ND ND ND ND ND 2400 ND ND 800 ND ND 63 71 9 ND
170 1900 ND ND 8030 2700000 ND ND 630000 ND ND 57000 118 ND
ND 6.3 ND ND ND 1300 ND ND 350 ND ND 40 1080 ND
810 9500 8910 8903 110000 1200000 17000 17103 470000 2850 2830 82000 2s800 26400
8 81 ND ND 870 49000 203 202 46000 27 7 25 2 1800 ND ND
ND ND ND 2 4 1100 ND EID 400 ND ND 32 ND ND
2800 4500 2670 2820 14000 5501200 3 090 3340 240000 3170 3290 25000 4750 4920
ND ND ND ND ND 80 ND ND ND ND ND ND ND ND
ND 80 ND ND ND ND ND ND ND ND ND 60 ND ND
89000 100000 104000 104am 600000 440000 345000 346000 210000 188000 188030 320000 321000 33 moo
ND ND ND ND ND ND ND ND ND ND ND 51 ND ND
19 24 ND ND 2 61 3300 ND ND 970 24 5 23 8 140 ND ND
ND ND ND ND 8 21 4300 ND ND 2700 ND ND 170 ND ND
ND NO ND ND ND 0.77 ND ND 0.27 ND ND ND ND ND
BOLD
BOLD ITALIC
BLUE 1TAL1C
-Value exceeds ISL or EPA tapwater RSL
-Value exceeds Tier 1 level or EPA MCL
- May 201 4 metaa concentrations were
anom alously high in general compared to
prior and later (Oct 2014) concentrations Therefore. May metals concentrations are
deem ed unrepresentative 01 site con drt ions
Table 2
Laboratory Ana lytital Results
GP Gypsum GrOunclWater Monitoring
Sample ID
Monitoring Well ID
Sample Date
Ana lyte Units 151.1 Tier
C10-C20 rrig/L No ISL No Tier 1 C20-C28 rng/L No ISL No Tier 1
Total TPH-DROi rng/L 1 10
Patterni
EPA RSL -
VOCs Ta water Primary MC L
BENZENE ugh Q39 5
TOLUENE ugh. 860 1COO
ETHYLBENZENE ugh 1 3 40
M-i-P-XYLENE ug/L 190 No Ma
O-XYLENE ugh 190 No Ma
TOTAL XYLEN ES µg/L 190 10000
NAPHTHALENE pg/L 014 No MCI.
SVOCS „
2-METHYLNAPHTHALENE pg/L 27 No ma
2,4-DIMETHYLPHENOL pg/L 36 No ma
NAPHTHALENE pg/L 014 No ma
ACENAPHTHYLENE pg/L No RSL No ma
ACENAPHTHENE µg/L 4o2 No ma
DIBENZOFURAN pg/L 5 8 No ma
DIETHYL PHTHALATE pg/L 15C0 No Ma
FLUORENE pg/I. 220 No ma
PHENANTHRENE pet. No RSL No ma
ANTHRACE NE pg/L 180 No ma
BIS(2-ETHYLHEXYL)PHTHALATE pg/L 5 6 No ma
BENZALDEHYDE pg/L 190 No ma
CARBAZOLE pg,/L No RSL No Ma
CAPROLACTAM pg/L 990 No ma
PYRENE pg/L 12 No ma 1,3:-BIPHENYL pg/L 083 No ma
METALS
ALUMINUM pg/L 16030 No ma
ANTIMONY pg/L 6 6
ARSENIC pg/L 0 045 10
BARIUM pg/L 380 2030
BERYLLIUM pg/L 2 5 4
CADMIUM pg/I. 6 9 5
CALCIUM pg/L No RSL No Ma
CHROMIUM pg/L No RSL 100
COBALT pg/L 4 7 No Ma
COPPER pg/L 620 1300
RON pg/L 11C00 No sna.
LEAD pg/L No RSL 15
MAGNESIUM pg/L No RSL No ma
MANGANESE pg,/L 320 No ma
NICKEL pg/L 303 No ma
POTASSIUM pg/L No RSL No ma
SELENIUM pet_ 78 50
SILVER pg/L 9 4 No ma
SODIUM pg/L No RSL No Ma
THALLIUM pg/L 016 '2
VANADIUM pg/L 78 No ma
ZINC pg/L 4703 No MCL
MERCURY pg/L 063 2
Notes
Only analytes detected in at least one well are listed
1 - Levels typically used by the DIV sion of Response and Remediation (DERR) to
evaluate petroleum hydrocarbon releases from underground storage tanks
These values are presented to provide an approximate cleanup goal for reference pu rpcs es only
2 - Sum of C10-C20 and C20-028 ranges
3 -As reported by ALS Environmental
4 - Samples we re fi eld filtered. all other samples were unfiltered
J - Estimated V alue - Result s less than the reporting limrt but greater than the
method detection hm it IMDL)
EPA RSL - Environmental Protedion Agency Regional Screening Level
GW-MW16 GW-DUP04 GW-MW16 MW-16 QAQC 62 MW-16` °AOC #24 GW-MW17 GW-MW17 MW-17 MVV-171
MW16 MW16 MW16 MW16 MW16 MW16 M4V16 MW17 MW17 MW17 MW17
17-Dec-12 17-Dec-12 30-May-14 29-Oct-14 29-Oct-14 29-Oct-14 29-Oct-14 8-Dec-12 29-May-14 29-Oct-14 29-Oct-14
ND ND ND ND ND 1 7 0 54 1 ND
ND ND ND ND ND 0211 ND ND
ND ND ND ND ND 1.91 054 ND
No Pattern No Pattern No Pattern No Pattern No Pattern Diesel No Pattern No Pattern
ND 0 311 ND ND ND OA31 ND ND
ND ND ND ND ND ND ND ND
ND ND ND ND ND 0641 ND ND
ND ND ND 0361 ND --
ND ND ND ND ND --
ND ND ND 036 ND ND
ND ND ND ND ND 3.3 0.571 ND
19 ND ND
ND ND ND
ND ND ND
ND ND ND
6 1 ND ND
3 71 ND ND
ND ND ND
11 ND ND
23 ND ND
ND ND ND
ND ND 17.9
ND ND ND
ND ND ND
ND ND ND
ND ND ND
11 ND ND
280012011 ND ND 337 ND 12000 ND ND
1101 ND ND ND !VD ND ND ND
1000 ND ND ND ND 19 17 24
110000 27 9 28 363 28 340 19 8 19 5
210 ND ND ND ND 0.981 ND ND
NO ND ND ND ND NO ND ND
25000000 59500 61700 66300 64030 46000 13103 13803
3000 ND ND ND ND 22 ND ND
1200 ND ND ND ND 1.11 ND ND
.3500 ND ND ND ND 12 ND ND
2900000 122 112 474 ND 8300 ND ND
1700 844 863 ND ND 11 668 ND
2200000 27900 28800 29503 29500 7400 2800 2770
100000 214 219 244 236 250 ND ND
1700 ND ND ND ND 8.4 ND ND
1000000 3680 3650 3880 3790 7900 2980 3140
ND ND ND ND ND ND ND ND
ND ND ND ND ND ND ND ND
250000 155C00 16C003 163000 164000 210000 229000 236003
NO ND ND - ND ND ND ND ND
6200 ND ND ND ND 51 44 3 44 1
7900 ND ND ND ND 29 ND ND
0,9 ND ND ND ND ND ND ND
BOLD
BOLD ITALIC
SLUE Mt L1C
-Value exceeds ISL or EPA tapwater RSL
-Value exceeds Tier 1 level or EPA MCL
- May 201 4 metals concentrations were
anom aloLsly high in general compared to
prior and later (Oct 2014) concentrations
Therefore. May metals concentrations are
deem ed unrepresentatkre of site con drt ions
MW-5 MW-6 MW-7 Analyte MW-4
Petroleum Hydrocarbons by 00150 (pgfL)
MW-9 MW-12 MW-13 MW-14 MW-15 MW-17 DUP-1 (MW-17)
0 2 U
0 19 U
0 17 U
0 58 U
0 2 U
2.02
0 17 U
0 58 U
2.44
11.3
0.375 J
8.39
0 2 U
0 19 U
0 17 U
0 58 U
0 2 U
0 19 U
0 17 U
0 58 U
0 2 U
0 19 U
0.17 J
0 58 U
0.396 J
0.367 J
0.229 J
2.04 J
0 2 U
0 19 U
0.175 J
0.616 J
0 2 U
0.261 J
0.184 J
0 58 U
0 2 U
0 19 U
0.465 J
0 58 U
0 2 U
0 19 U
0.256 J
0 58 U
OD (PcOLI
Benzene
Ethylbenzene
Toluene
Xylenes, Total
by [WS a
0 21 U
0 319 U
0 21 U
0 21 U
0 319 U
0 21 U
0.306 J B
0 319 U
0 319 U
7_85 B
6.70
6.78
0 21 U
0 319 U
0 21 U
0 21 U
0 319 U
0 21 U
2.37 JB
2.32
2.32
0.236 J B
0 319 U
0 319 U
0.296 J B
0 319 U
0 319 U
Naphthalene (8260B)
Naphthalene (8270D)
Naphthalene (Interpreted)
0 21 U
0 319 U
0 21 U
0 21 U
0 319 U
0 21 U
13_7
8.57
1.01 J
1 98 U
0.7 J
1 9 U
0 345 U
0 276 U
0 302 U
1 98 U
0 328 U
1 9 U
0 345 U
0 276 U
0 302 U
1 98 U
0 328 U
1 9 U
0 345 U
0 276 U
0 302 U
1 98 U
0 328 U
1 9 U
0 345 U
0 276 U
0 302 U
1 98 U
0 328 U
1 9 U
0 345 U
0 276 U
0 302 U
1 98 U
0 328 U
1 9 U
0 345 U
0 276 U
0 302 U
1 98 U
0 328 U
1 9 U
0 345 U
0 276 U
0 302 U
1 98 U
0 328 U
1 9 U
0 345 U
13.4
2.52
1 98 U
2.19
23.7
0 345 U
0 276 U
0 302 U
1 98 U
0 328 U
1 9 U
0 345 U
14_9
0 302 U
2.01 J
5.8
IOU
2-Methylnaphlhalene
Acenaphthene
Acenaphthylene
Acetophenone
Ant racene
Biphenyl
82.9 J
54.5 J
137 J
40% J
136
64.1 J
200
32% J
78.8 J
276
355
78% J
3030
242
3270
7%
6350
507
6860
7%
1020
14000
15000
93%
4180
293
4470
7%
43 1 U
43 1 U
86 2 U
43 1 U
43 1 U
86 2 U
43 1 U
43 1 U
86 2 U
43 1 U
43 1 U
86 2 U
C10-C20
C20-C28
TPH C10-C28
TPH %C20+
• .
700 (1100
Carbazole 2 41 U 2 41 U 2 41 U 2 41 U 2 41 U 2 41 U 6.09 J 2 41 U 2 41 U 2 41 U 2 41 U
Dibenzofuran 2 5 U 2 5 U 2 5 U 4.98 J 6_17 J 2 5 U 6.91 J 2 5 U 2 5 U 2 5 U 2 5 U
Fluorene 0 276 U 0 276 U 0 276 U 12.3 20.4 0 276 U 18 0 276 U 0 276 U 0 276 U 0 276 U
NMI --- MIN MI IM --1•11 INN -MEM MO MN
Table 1. December 2015 Groundwater Sampling Results
Phenantrene 0 362 U 0 362 U 0 362 U 9.07 9.01 0 362 U 5.31 0 362 U 0 362 U 0 362 U 0 362 U
Pyrene 0 302 U 0 302 U 0 302 U 0 302 U 1.95 0 302 U 0.954 J 0 302 U 0 302 U 0 302 U 0 302 U
Notes
U Not detected; method detection limit provided
J Estimated; detected below practical quantitation level
B Analyte was detected in associated Method Blank sample
20160114 SigurdGWQxlm Remits
Table 1. November 2016 Groundwater Sampling Results, GP Sigurd
Analyte
1,
MW-2 MW-4
"Alt,
MW-5 MW-6
C10-C20
C20-C28
TPH: C10-C28
TPH: %C20+
0.0843 U
0.0843 U
0.169 U
0.191
0.12
0.311
39%
0.0843 U
0.084 3 U
0.169 U
Benzene 0.2 U 0.2 U 0.2 U
Ethylbenzene 0.19 U 0.19 U 0.19 U
Toluene 0.17 U 0.17 U 0.17 U
Xylenes, Total 0.58 U 0.58 U 0.58 U
Naphthalene (8260B) 0.21 U 0.21 U 0.21 U
Naphthalene (8270D) 0.343 U 0.343 U 0.343 U
Naphthalene (interpreted ) 0.21 U 0.21 U 0.21 U
2-Methylnaphthalene 0.37 U 0.37 U 0.37 U
Acenaphthene 0.296 U 0296 U 0.296 U
Acena phthylene 0.324 U 0.324 U 0.324 U
Acetophenone 1.57 U 1.57 U 1.57 U
Anthracene 0.352 U 0.352 U 0.352 U
Biphenyl 1.11 U 2.08 J 1.11 U
Caprolactam 1.48 U 1.48 U 1.48 U
Carbazole 0.833 U 0.833 U 0.833 U
Dibenzofuran 1.2 U 1.2 U 1.2 U
Fluorene 0.296 U 0.296 U 0.296 U
Phenanthrene 0.389 U 0.389 U 0.389 U
Pyrene 0.324 U 0.324 U 0.324 U
Nitrate as N) 0 51 1.75 irtVATAV,40,kr,;•,,,„1.,,fivp,
Iron 0.05 U 1.35
Notes:
DUP 1
(MW-6) v
MW-7
l KW, ;it 4
'qur
MW-9 MW-11 MW-12 MW-13 MW-14 MW-15 MW-17
4rdt.1e.,/,
0.0843 U
0.0843 U
0.169 U
1.64
0.16
1.80
92.7
7.64
100.34
2.28 U
14.8
17.08
22.1
1.36
23.46
0.0843 U
0.0843 U
0.169 U
0.0843 U
0.223
0.31
0.0843 U
0.0843 U
0.169 U
9% 8% 87% 6% 73%
0.2 U 0.2 U 0.2 U 0.45 J 1.07 0.2 U 0.2 U 0.2 U
0.19 U 1.4 0.608 J 0.19 U 4.15 0.19 U 0.19 U 0.19 U
0.17 U 0.17 U 0.17 U 0.17 U 0.17 U 0.17 U 0.17 U 0.17 U
0.58 U 0.58 U 0.58 U 2.32 J 1.51 J 0.58 U 0.58 U 0.58 U
0.21 U 4.68 J 0.374 J 0.21 U 1.29 J 0.21 U 0.21 U 0.21 U
0.343 U 1.79 J 9.25 U 9.25 U 9.25 U 0.343 U 0.343 U 0.343 U
0.21 U 4.68 J 0.374 J 021 U 1.29 J 0.21 0.21 U 0.21 U
0.37 U 2.34 10 U 10 U 10 U 0.37 U 0.37 U 0.37 U
0.296 U 4.08 77.3 8 U 8 U 0.296 U 0.296 U 0.296 U
0.324 U 0.324 U 8.75 U 8.75 U 8.75 U 0.324 U 0.324 U 0.324 U
1.57 U 1.57 U 42.5 U 42.5 U 42.5 U 1.57 U 1.57 U 1.57 U
0.352 U 0.352 U 9.5 U 9.5 U 9.5 U 0.352 U 0.352 U 0.352 U
1.11 U 1.11 U 53.8 J 30 U 30 U 1.11 U 1.11 U 1.11 U
1.48 U 152 40 U 40 U 40 U 1.6 J 1.48 U 1.48 U
0.833 U 0.833 U 22.5 U 22.5 U 22.5 U 0.833 U 0.833 U 0.833 U
1.2 U 2.62 J 32.5 1J 32.5 U 32.5 U 1.2 U 1.2 U 1.2 U
0.296 U 6.49 127 8 U 8 U 0.296 U 0.296 U 0.296 U
0.389 U 4.56 173 10.5 U 10.5 U 0.389 U 0.389 U 0.389 U
0.324 U 0.324 U 20.4 „I 8.75 U 8.75 U 0.324 U 0.324 U 0.324 U
r,r,*
86.1
U: Not detected; method detection limit provided.
J: Estimated; detected below practical quantitation level
20170309 Sig urd GWQ xlsx Results
2017 Groundwater Monitoring Report
Georgia-Pacific Forrner Gypsum Manufacturing Facility
APPENDIX C.
THEIL-SEN TREND ANALYSES
April 13, 2018 TETRA TECH
30
•
25
NAPHTHALENE at MW-13 120
• Data
100 Theil-Sen Trend
P95 Trend
I! 80 ret Noncanoer SL (THI=1)
0 •
1/1/12 12/31/12 12/31/13 12/31/14 1/1/16 12/31/16 12/31/17
Date
ETHYLBENZENE at MW-13 70
• • Data
60 Theil-Sen Trend
—P95 Trend 50 EPA Ingestion SL (TR=1E-05)
cs 40 No. EPA Ingestion SL (TR=1E-06)
10
•
1/1/12 12/31/12 12/31/13 12/31/14 1/1/16 12/31/16 12/31/17
Date
60 .1=
a) 0 40
20
BENZENE at MW-13
10 o 0
0
1/1/12 12/31/12 12/31/13 12/31/14 1/1/16 12/31/16 12/31/17
Date
414•4 •
• Data
Theil-Sen Trend
—P95 Trend
MCL
MB-- MI —111INION NM MI NM MON111 Mil MI WM En NM MN
• 0
1/1/12 12/31/12 12/31/13 12/31/14 1/1/16 12/31/16 12/31/17
Date
18
15
2 3. 12
0
0 1/1/12 12/31/12 12/31/13 12/31/14 1/1/16 12/31/16 12/31/17
Date
NAPHTHALENE at MW-9 7
6
.10,.....
-_,......,...
• 0
12/31/12 12/31/13 12/31/14 1/1/16 12/31/16 12/31/17
Date
• Data
Theil-S en Trend
P95 Trend
Noncancer SL (THI=1)
3
NAPHTHALENE at MW-7
• Data
Theil-S en Trend
---- P95 Trend
—Noncancer SL (THI=1).
•
30
•
ETHYLBENZENE at MW-7
• Data
Theil-Sen Trend
—P95 Trend
EPA Ingestion SL (TR=1E-05)
EPA Ingestion SL (TR=1E-06)
IIINI MINN— MN NM NM —01115— MTh ME INN MIN INNI
2017 Groundwater Monitoring Report
Georgia-Pacific Former Gypsum Manufacturing Facility
APPENDIX D.
PREDICTIVE THEIL-SEN TREND ANALYSIS
FOR NAPHTHALENE AT MW-7
April 13, 2018 TETRA TECH
II I I I I I I I IN-- NM V I I I 1 --SION 11=-111111 =I I I I IN 1 I I I I N
NAPHMALENE at MW-7
• Data • —Theil-Sen Trend
- — P95 Trend
— hloncencer SL (TH 1st)
• Hypothetical samples
5 • o •
11112 111116 111/20
Date