DERR-2025-001536

State of Utah
GARY R. HERBERT
Governor
GREG BELL
Lieutenant Govemor
Department of
Environmental Quality
Amanda Smith
Executive Directar
DIVISION OF ENVIRONMENTAL
RESPONSE AND REMEDIATION
Brent H. F,verett
Director
ERRC-175-11
October 26.2011
Ryan Dunham, Site Assessment Manager
U.S. EPA, Region 8
1595 Wynkoop Street 8EPR-B
Denver, Colorado 80202- | I29
Dear Mr. Dunham:
Per your instructions, enclosed is a hard copy of the Site Reassessment (SP l^) Report for
the Redwood Road Dump site (referred to as the "Site"). The only change from the hardcopy
sent July ll, 2011, is a modification of the Site Conceptual Model (Figure 3). I have also
enclosed a copy of the previous signature page and a new signature page modified to include your
signature information. If acceptable, please return a copy of the signed signature page for
inclusion in our Site files. Please contact Neil Taylor at [phone] if you have any questions
concerning the Site Reassessment Report.
Sincerely,
,),1. / r\ nlt^VL., I t^Vt\-
/*-
| v"w.'/H
bale T. Urban P.G.
Site Assessment Section Manager
Division of Environmental Response and Remediation
DTUA{BT/eds
Enclosure(s)
195 North 1950 West. Salt lake City, UT
Mailing Address: P.0. Box 1M840 . Salt Lake City, UT 84114-4844
Telephone [phone] . Fax [phone] . T.D.D. (801) 536-M14
www.deq.utoh. tt,l
Printed on 1007o recycled paper
srrE RE-ASSESSMENT (Snel REPORT
Redwood Road Dump
Salt Lake County, Utah
urD980961502
Prepared by: Neil Taylor
Utah Department of Environmental Quality
Division of Environmental Response and Remediation
It
Approved: ?"Q, A U^ 0
Dale T./Urban, UDEQ Site Assessment Section Manager
Approved:
Approved:
Ryan Dunham, Site Assessment Manager, EPA Region 8
Neil Taylor, UDEQ
Date: @rf
oate: Vz:Ei\t
Date:
State of Utah
GARY R. HERBERT
Governor
GREC BELL
Liettenant Governor
Department of
Environmental Quality
Amanda Smith
Execulive Direcnr
DTVISION OF ENVIRONMENTAL
RESPONSE AND REMEDIATION
Brent H. Everett
Director
ERRC-105-11
July 11, 2011
Margaret Williams, Site Assessment Manager
USEPA Region I -
1595 Wynkoop St 8EPR-B
Denver, Colorado 8A202-I I2g
:'.
Dear Ms Williams: "
Enclosed for your review is the iit, Rrorr"ssment (SRA) Report for the Redwood Road
Dump site (referred to as the "Site"). The Site was the primary landfill for Salt Lake City frbm 1923
until 1962. The Site is estimated to contain approximately 1,340,000 cubic yards of refuse and fill;
Interstate 215 was constructed through the center of the Site in 1988 creating an eastern and western
refuse pile;
The nonhern portion of the western landfill is used-for the City's automobile impound lot. Salt
and gravel are stored on the southern portion of the western landfill. A City vehicle washing and
refueling facility is under construction on City property northwest of the easteri landfill. Snow .
cleared from downtown Salt Lake City in the winter is placed on rhe highest portion of the eastern
landfill by City streets personnel, potentially increasing the volume of contaminated landfill leachate.A 1991 Site Investigation and a 2000 Targeted Brownfields Assessment have established the
following:
Elevated concenfations of lead (2,610 mg/kg), benzo (a) pyrene (5,000 pglkg) and dibenz (a, h)
anthracene (1,000 pglkg were identified in subsurface soils. Elevated concentrations of arsenic.
(1,290 pgL) antimony Qa.z p"glL), selenium Q .8 pgtL) and pentachlorophenol (3 ltglL)have
been found in Site groundwater. The sampling of downgradient wells was not included in the
previous studies. Therefore, the extent of downgradient groundwater contamination is unknown.
City Drain Canal surface water lead concentrations rise from a non-detectable backglound
concentration to a high of 59.2 pgtL downstream from the Site. This concentration significantly
exceeds the surface water Criteria Continuous Concentration of 2.5 pglL. Arsenic levels increase
from a background concentration of 61 ltglL to 82.5 p{L after surface water passes the Site. A
wetland environment exists ten miles downstream of the Site at the Great Salt Lake-
Approximately 50 miles of wetland frontage occur within the 15 mile target distance limit.
Several duck hunting clubs are located within these wetland areas. Site.drainage enters the Great
Salt Lake at Farmingron Bay Wildlife Refuge.
t95 Norrh 1950 West . Salt Lake Ciry, UT
Mailing Address: P.O. Box 144840'Salt Lake Ciry, UT 84t t4-4840
Telephone [phone]- Fax [phone]. T.D.D. (80t) 536-4414
wtstt.dtq.utah.gos
Printed on l00ci recycled paper
Page 2
We recommend that an Expanded Site Investigation include; (l) the sampling of downgradient
shallow wells and wetiands and, (2) the resampling of groundwater and surface water. Inorganic and
organic sampling data can then be evaluated with previously collected results to better understand
threats to wetlands and wildlife and the potential for site listing on the National.Priorities List.
After reviewing the SRA report, please inform us of any comments or changes that need to be
incorporated in the final version of the document. Please contact Neil Taylor at [phone] if you '
have any questions.
Sincerely,
^.r /.\rtl/'Ut UJ{L-'I
Dale T. Urban P.G.
Site Assessment Section Manager
Division of Environmental Response and Remediation
DTU/NBT/eds
Enclosure(s)
SITE RE-ASSESSMENT (SRA) REPORT
Redwood Road Dump
Salt Lake County, Utah
uTD980961502
Utah Department of Environmental Quality
Division of Environmental Response and Remediation
Prepared by: Neil Taylor
SITE RE-ASSESSMENT (SREI REPORT
Approved:
Approved:
Approved:
Redwood Road Dump
Salt Lake County, Utah
urD980961502
Prepared by: Neil Taylor
Utah Department of Environmental Quality
Division of Environmental Response and Remediation
Margaret Williams, Site Assessment Manager, EPA Region 8
Neil Taylor, UDEQ
Date: r/z/t
Date: 1/ t,/ zon
Date:
Urban, TIDEQ Site Assessment Section Manager
TABLE OF CONTENTS
l..O INTRODUCTION
2.0 SITE OBJECTIVES.............
3.0 SITE LOCATION DESCRIPTION
3.1 SITE HTSTORY AND PREVIOUS WORK.................:... ...................... 1
3.2 CURRENT SITE CONDITIONS AND NEAR FUTURE USES .......... ....,.................4
3.3GEOLOGY,I{YDROGEOLOGY,HYDROLOGYANDMETEOROLOGY.. ..........4
3.4 SITE CONCEPTUAL MODEL
4.0 PATHWAY ANALYSN
5.0 ST]MMARY AND CONCLUSIONS t2
6.0 REFERENCES 15
LIST OF FIGURES, TABLES AND APPENDICES
LIST OF FIGURES
Figure 1
Figure 2
Figure 3
LIST OF TABLES
Table I
Table 2
Table 3
LIST OF APPENDICES
Appendix A
Appendix B
Appendix C
Appendix D
Site Location Map
Site Map
Conceptual Site Model
Population Receiving Groundwater from Wells Located within
Four Miles of the Site
Redwood Road Dump 1991 Site Inspection Metals Detected in
Groundwater abbve SCDM Benchmarks
Population Estimates within Four Miles of the Redwood Road
Dump
Site Visit Report
EPA Preliminary Assessment Worksheet
Utah Department of Transportation 1977 Preliminary
Investigation- Borehole Data Table
and
Utah Division of Environmental Response and Remediation l99L
Site Investigation -Selected Figures and Data Tables
Utah Division of Environmental Response and Remediation
Targeted Brownfields Assessment Analyical Results Report
Western Portion of the Redwood Road Dump and the Salt Lake
City Road Maintenance and Automobile Impound Lot-Selected
Figures and Data Tables
l.O INTRODUCTION
Under authority of the Comprehensive Environmental Response, Compensation, and
Liability Act (CERCLA), as amended by the Superfund Amendments and
Reauthorization Act (SARA), and in accordance with applicable provisions of the
National Contingency Plan, the Utah Department of Environmental Quality, Division of
Environmental Response and Remediation (DERR) has prepared this Site Reassessment
Report (SRA) for the Redwood Road Dump, UTD980961502 (referred to as the "Site")
in Salt Lake City, Salt Lake County, Utah. This SRA was prepared under a cooperative
agreement between DERR and the U.S. Environmental Protection Agency, Region 8
(EPA). The purpose of the Site details described herein is to report information
concerning current Site conditions, assess the threat posed to human health and the
environment from hazardous materials or potential releases of hazardous materials and to
support decisions regarding further investigation under CERCLA or other appropriate
authority. Additionally, contaminant pathways/targets and near future uses of the Site
were examined to identify if any possible changes to the property were imminent. The
Site Visit Report is included as Appendix A. The EPA Preliminary Assessment
Worksheet is provided as Appendix B.
2.0 SITE OBJECTIVES
The objectives of the activities performed during the SRA were related to assessing if
hazardous substances located on-site pose a threat to human health or the environment.
The objectives of this SRA were to:
o Determine the continued presence of contamination in selected media;
o Assess the potential contamination characteristics;
o Assess the potential routes for contaminant migration;
o Assess the suspected exposure pathways;
o Identify potential targets that may be affected by on-site contamination as
well as other targets that may be impacted by the migration of the
contamination via the suspected exposure pathways; and
o Determine if continued assessment under CERCLA is warranted.
3.0 SITE LOCATION DESCRIPTION
3.1 SITE HISTORY AND PREVIOUS WORK
The Site extends west from 1900 West Street to 2200 West Street. and south from 500
South Street to Indiana Avenue (800 South) in Salt Lake City, Utah (Figure l). The Site
is approximately 7A acres in size and is owned by Salt Lake City Corporation (DERR,
1995). The Site is located in the SE y4 of the SE 1/4 of the NE 1/4 of Section 9,
Township I South, Range I West, Salt Lake Base Meridian (USGS, 1962). The Site is
bisected by Interstate 215 (I-2I5) and includes an eastem and western refuse pile. The
Salt Lake City Road Maintenance and Automobile Impound Lot is located directly north
(across 500 South Street) of the western portion of the Site.
The Site was the primary landfill for Salt Lake City fuom 1923 to 1962, when it was
closed to public dumping (DERR, 1995). The Site is estimated to contain approximately
1,340,000 cubic yards of refuse and fill (DERR, 1995). A manifest system was not in
place at the landfill during its operation and no records remain of waste content or
quantities dumped at the Site (UBSHW,1987). In addition, no regulations were in place
to limit possible hazardous waste additions to the landfill. The Site was reported to take
in household, commercial and industrial wastes. The Site has experienced numerous sub-
surface fires, occasional bad odors, caving and differential settling due to decomposing
refuse (UBSFIW, 1987).
The eastern portion of the Site was used from 1962 ta 1995 by Salt Lake City
Corporation's Parks and Recreation Department and Public Services Department for the
disposal of leaves, grass clippings, tree trimmings and storm sewer sludge (DERR, 1995).
I-215 was constructed through the center of the Site in 1988 creating an eastern and
western refuse pile. It is believed that waste characteristics at the Site include municipal
wastes such as household, commercial, industrial and organic materials.
A report entitled "Preliminary Investigations Disposition of Garbage Materials in
Abandoned Landfill" (PI) was prepared for the Utah Department of Transportation
(UDOT), Salt Lake City, Utah, by Dr. David W. Eckhoff in July of 1977 (Eckoff, 1977).
The investigation found that mixed garbage and refuse had been dumped and bumed on
the Site. Twenty auger holes were drilled into the landfill. Forty three measurements for
explosive gas were taken at five foot intervals within the drill holes. The borehole
explosive gas concentrations are provided in Appendix C, Table 1.
The refuse and cover material in the interstate right-of-way was moved to the east pile
during the construction of I-215 in 1988 (DERR, 1995). A Preliminary Assessment (PA)
of the Site was prepared by the Utah Department of Health's Bureau of Solid and
Hazardous Waste in 1987. A 1991 Site Inspection (SI) sampling event included seven
groundwater samples, three surface water samples, ten soil samples and three sediment
samples (DERR, 1992). The monitoring well physical groundwater parameters are
provided in Appendix C, Table 2. The organic data results for groundwater and surface
water samples are provided in Appendix C, Table 3. The inorganic analyses for
groundwater and surface water samples are provided in Appendix C, Table 4. The
organic analyses for soil and sediment samples are provided in Appendix C, Table 5.
The inorganic analyses for soil and sediment samples are provided in Appendix C, Table
6. The original report sample location map is provided as Appendix C, Figure 5. Figure
5a places the approximate sample locations on a 2008 satellite photograph. Figure 5b
provides arsenic concentrations for soil and groundwater samples. The original report
Site groundwater map is provided as Figure 6.
EPA Region 8 gave the Site a higher priority for further investigation under CERCLA on
January 27,1992 (USEPA, 1992). DERR conducted a Site Inspection Prioritization
(SIP) for the Site in September, 1995. The report concluded that the Site may present
hazards to those working and living near it, as well as to transients and bottle collectors
(DERR, 1995). Although the Site is vegetated and surface runoff is slow, the SIP
concluded that the accumulated refuse, soil, and shallow groundwater contain hazardous
substances and these present a threat to human health and the environment.
Chromium and lead contaminated soils were illegally placed on the central part of the
eastern landfill some time during December of 1991 by Tool Design Engineering and
Manufacturing facility personnel (DSIIW, 2010). Chromium concentrations in samples
collected from the soil ranged from 1,240 m/kg to 3,300 mglkg. lrad concentrations
ranged from 1,000 mgkg to 1,800 mgkg. The contaminated soils were discovered in
1992. Approximately 310 cubic yards of soil was removed from the landfill under the
supervision of the Division of Solid and Hazardous Waste and Terracon Consultants in
November L997. All eight cleanup verification samples were non-detect for chromium.
Seven of eight confirmation samples were non-detect for lead with the remaining sample
yielding 0.1 mg/kg lead (Terracon,1997). The EPA residential screening level for lead is
generally 400 mg/kg.
DERR conducted a Targeted Brownsfields Assessment (TBA) for the western portion of
the Site and the Salt Lake City Road Maintenance and Automobile Impound Lot in June,
2000. Selected figures from that assessment together with 2008 satellite photo overlays
are provided as Appendix D. Field work was conducted to assist Salt Lake City
Corporation in gathering additional information about the Site (DERR, 2001). Appendix
D, Figure 1 identifies the approximate location of trenches cut and sample locations.
Phase I consisted of using a backhoe to cut trenches into the subsurface to evaluate the
extent and type of refuse present. Soil samples were collected from selected locations.
Phase II consisted of installing l5 direct push borings across the western landfill. Soil,
soil gas, groundwater and surface water samples were collected and submitted for
laboratory analysis of volatile organics, semivolatile organics, metals and pesticides.
Field observations from the June 15, 2000 trenching and investigation activities suggest
the extent of refuse in the western landfill is potentially limited to the landfill's eastem
bench.
The Portland Cement Superfund site is located directly south of the eastern landfill and
Indiana Avenue on approximately 71 acres. The risks posed by the Portland cement site
were derived from cement kiln dust and chromium bearing bricks which were landfilled
within the Site boundaries. The dust contained several heavy metals including: arsenic,
cadmium, chromium,lead, manganese and molybdenum. The contaminated soil, kiln
dust and chromium bricks were removed from the Portland cement site from 1992
through 1997. The Portland Cement site Record of Decision for Operable Unit Three
(groundwater) states that groundwater contamination is contained in the shallowest
aquifer within the Portland Cement site boundaries by a canal on the eastern boundary of
the Portland Cement site known as the "City Drain", a City sewer line on the east and
north of the site, and a storm water ditch west of I-215. Analytical results of semiannual
groundwater monitoring beneath the Portland Cement site indicate that the contaminant
plume is limited to shallow groundwater within the Portland Cement site boundaries
(DERR,20A7).
3.2 CURRENT SITE CONDITIONS AND NEAR FUTURE USES
The northern portion of the western landfill and the sliver of land directly north of the
western landfill across 500 South Street are used for Salt Lake City's automobile
impound lot. Salt and gravel are stored on the southern portion of the western landfill.
Both landfills are perimeter fenced (DERR, 20I0a). The landfills are closed to the public
with no dumping allowed (Pope, 2010). The eastern landfill is elevated about 10 feet
above the natural ground surface and is covered with soil and natural vegetation. The
landfill is about 300 yards wide and 400 yards long. Various materials are stored on a
flat area northeast of the eastern landfill. Some of these materials include soil from the
City cemetery, wooden posts, large flowerpots for decorative downtown projects, and
large utility poles.
A City vehicle washing and refueling facility is under construction on City property
northwest of the eastern landfill. The City chips trees, limbs and leaves on a large
asphalted area southeast of the eastern landfill. This material is later hauled to the county
landfill for composting. Plans are being considered to extend this asphalted area further
north and convert the area into a temporary model airplane airport. Access to the landfill
outside the asphalted area will remain restricted (Pope, 2010).
Snow cleared from downtown Salt Lake City is placed on the highest portion of the
eastern landfill by City streets personnel. An area on the elevated eastern landfill has
been leveled and covered with clay and gravel for this purpose.
3.3 GEOLOGY, HYDROGEOLOGY. HYDROLOGY AND METEOROLOGY
The Site is located within the Jordan River Valley of the Great Basin Section of the Basin
and Range Physiographic Province. The Jordan River Valley is bounded by the Wasatch
Mountains to the east, the Oquinh Mountains to the west, the Traverse Mountain Range
to the south, and the Great Salt Lake to the north. Basin-fill deposits were eroded from
the Wasatch and Oquirrh Mountains and deposited in the Salt Lake Valley. The general
stratigraphy of the area is charucteized by several hundred to several thousand feet of
unconsolidated and semi-consolidated basin fill deposits. Mountain streams and
historical lakes carried most of the sediment into the basin and ancient Lake Bonneville.
The fine-grained sediments were deposited in deeper portions of Lake Bonneville. The
coarser-grained sediments were deposited along the margins of ancient Lake Bonneville
near the mountains as its level eventually receded to its present level as the Great Salt
Lake (Waddell, et al,1987).
Precipitation that falls as rain or snow in the mountain ranges flows down the range
fronts and recharges the deep aquifer within the Salt Lake Valley. The shallow water
table aquifer is generally recharged by downward infiltration from precipitation, canals,
irrigatedlands and streams as well as by upward leakage from the underlying confined
aquifer (Waddell, et al, 1987). Surficial basin fill deposits within the Salt Lake Valley
generally consist of a series of Quatemary lacustrine, alluvial fan, sand dune, mud-rock
flow, ash falls, glacial and flood plain sediments. Groundwater occurs within these
4
valley fill deposits as a complex series of aquifers (Waddell, et al, 1987). The deeper
aquifer lies in Quaternary deposits of clay, silt, sand, and gravels that are hydraulically
interconnected with individual beds of sand and gravel ranging in thickness from less
than one foot to tens of feet. The maximum thickness of the principal aquifer is greater
than 1,000 feet in the northern portion of the valley. Most deep wells in the Salt Lake
Valley are completed in sediments at depths of less than 1,200 feet.
Municipal wells within four miles of the Site are completed at depths of 1,100 feet and
less (DERR,1992). There are no wells currently in use on-site (DERR, 2010a). Drilling
logs from the four monitoring wells installed at the Site in 1991, in addition to the well
logs from the neighboring Portland Cement site (UTD980718670) reveal a lithology of
clay, silt and sand beneath the landfill (DERR, 1995). A soil survey of the Salt Lake area
identified the soils at the Site as dumps (Du), Salt Air Silty Clay Loam ($a), Loamy
Borrow Pits (Lo), Sandy Terrace Escarpments (Sc), and Decker Fine Sandy Loam (De)
(DERR, t992).
Groundwater flow in the shallow aquifer although complex, due to the interaction with
local surface water and underground utility pathways, is generally to the northwest.
Appendix C, Figure 6 provides known groundwater contours and the anticipated
groundwater flow direction. A 42 inch sanitary sewer is buried at an average depth of 17
feet below grade on the eastern border of the Site. The bedding material of the sewer line
appears to be removing groundwater from the shallow aquifer and routing it to the City
Drain. Groundwater flow under the eastern landfill also appears to be toward the City
Drain (DERR, 1992).
The Salt Lake Valley is located in the Great Basin drainage system, which is a closed
system with no outlets. The Jordan River and its tributaries form the main drainage for
the valley. The Jordan River is a Class 3C stream and discharges into the Great Salt
Lake. The Surplus Canal and the City Drain are located in close proximity to the Site.
The City Drain is located west of I-215 and just east of the western landfill. The surplus
Canal is a losing stream and likely receives no contribution from contaminated
groundwater (EPA, 1998). The "North Ditch" drains the City property northeast of the
eastern landfill. The ditch is piped to a storm drain that flows to the City Drain. The
City Drain is the primary groundwater discharge point. The City Drain joins the Sewer
Canal approximately six miles to the north of the site. The Sewer Canal eventually
discharges into the Great Salt Lake. The Surplus Canal is located approximately 1,000
feet to the west of the Site. The discharge points for the Jordan River, the Surplus Canal
and the Sewer Canal into the Great Salt Lake are characteized by freshwater marshes.
The discharge points are within the confines of the Farmington Bay Waterfowl
Management Area (DERR, 1992).
The Salt Lake Valley is characteized as being semiarid. The normal maximum
temperature ranges from 37.0o F. in January to 93.7" F in July. The normal minimum
temperature ranges from 19.7o F in January to 61.8'F in July. The average annual
rainfall is 15.31 inches per year with a normal monthly high of 2.21inches in April and a
normal monthly low of 0.72 inches in July. The average annual snowfall is 58.0 inches.
The estimated pan evaporation is a 3.91 inches per year. The winds are predominantly
from the south and southeast and have a mean speed of four to five miles per hour
(Ashcroft, 1992).
3.4 SITE CONCEPTUAL MODEL
Water from precipitation and snow dumping flow through the unlined landfill waste. The
leachate contaminates shallow groundwater. The contaminated groundwater flows to the
City Drain Canal which bisects the site and is carried north by surface water flow into
wetlands and bird habitats. Contaminated groundwater also flows to the northwest in the
subsurface, potentially contaminating shallow, private water wells. The site conceptual
model is illustrated as a flow chart in Fisure 3.
4.0 PATHWAY ANALYSIS
4.1 SITE WASTE SOURCES QUANTITY AND CHARACTERISTICS
Both west and east landfills contain municipal trash and unknown quantities of hazardous
materials. Both petroleum and chemical wastes were found in soil borings that were part
of a 1977 IJDOT landfill waste investigation. The volume of the landfills is calculated at
approximately 1,338,000 cubic yards (Eckoff,1977). The landfills are not properly
contained to minimize leaching of materials into the shallow groundwater.
4.2 GROUNDWATER MIGRATION PATHWAY
4.2.1 TARGETS
Seventeen municipal wells from three cities are located within the four mile target
distance range. All wells are located east or south of the Site and hydraulically
upgradient (DDW, 20I0a; DDW,2010b). All three city water systems are blended with
multiple groundwater and surface water sources. Table 1 identifies the population served
by the three public water systems having wells located within four miles of the Site.
Table L
Population Receiving Groundwater from Wells Located
within Four Miles of the Site
Svstem Name Population Served
Granger-Hunter Improvement District 106.000
Salt Lake City 387,506
South Salt Lake 18,000
Total Population Served 5l l,506
Approximately 4,102 underground points of diversion are located within four miles of the
Site. The uses for the large majority are for "domestic" or irrigation purposes and most
are upgradient of the Site (DWR, 2010). The closest downgradient well is approximately
400 yards northwest of the Site, north of 500 South and east of the Surplus Canal. The
6
well is 2 inches in diameter, 280 feet deep and was drilled in 1947. All downgradient
wells within 1.5 miles are from 200 to 400 feet deep, artesian wells, drawing from the
deeper, confined aquifer. It is likely that shallow groundwater flows into the City Drain
Canal that bisects the site.
4.2.2 SUMMARY OF PAST RESULTS
4.2.2.1DERR 1991 Site Inspection
Four monitoring wells installed by EPA and two Portland Cement CERCLA Site
monitoring wells to the south of the Site were sampled (Appendix C, Figure 5). A
duplicate sample was also collected from RD-MW-O2.
Appendix C, Tables 3 and 4 summarize the analytical results for the seven groundwater
samples. All samples were analyzed for volatiles, base-neutrallacid extractables,
pesticides, PCBs and metals. There were no pesticide or volatile compounds detected in
the groundwater samples. There were no organic chemical concentrations found above
Superfund Chemical Data Matrix (SCDM) benchmarks (SCDM, 2004). Appendix C,
Table 4 lists the inorganic analyses. A summary of the metals detected near or above
SCDM benchmarks is provided in the table below. Arsenic was detected at314 pglL,
248 p"glL and 179 pgLir three of the four downgradient wells compared ta 19 p.glLin
the background well. Sample RD-MW-OS contained 3a.2 TtglL antimony. Selenium was
detected in RD-MW-O1 at A.8 1.tglL.
4.2.2.2 DERR 2000 Targeted Brownfields Assessment
Approximately 15 direct push borings were installed across the Site during the 2000
TBA. Soil, soil gas, groundwater and surface water samples were collected and
submitted for volatile organic, semivolatile organic, pesticides, PCBs and dissolved
metals analysis.
Table2
Redwood Road Dump 1991 Site Inspection
Metals Detected in Groundwater above SCDM Benchmarks
Metal MCL
@etL)
RDSC
Q.tdr)
CRSC
QletL)
Highest
Concentration
Detected
tuslL\
Arsenic 10 11 o.57 314
Antimonv 6 15 34.2
Selenium 50 180 14.8
MCL = Drinking Water Maximum Contaminant Level
RDSC = Reference Dose Screenins Concentration
CRSC = Cancer Risk Screenins Concentration
Sampling results from the June 2000 TBA revealed pentachlorophenol in sample RRD-
11 at an estimated concentration of 3 ttdL. The MCL for this compound is I pgll-. No
other organics were detected in the groundwater above SCDM benchmarks (DERR,
2001).
Arsenic was detected in many groundwater samples above the MCL of I0 ltgll-. Arsenic
was found in sample RRD-I at 1,290 ptglL and in RRD- 2 at 1,000 pgL. Both sample
locations are north of the Site (Appendix D, Figure 5). Dissolved arsenic was reported in
RRD-7 at an estimated concentration of 1,170 pgL. Other groundwater samples ranged
from 2-4 trt"gll- to 236 1t glL. No other dissolved metals were detected in the groundwater
above SCDM benchmarks. The sampling locations and groundwater arsenic
concentrations from the June 2000 sampling event are included as Appendix D, Figure 5.
4.2.3 DATA GAPS
No shallow groundwater samples have been collected farther downgradient (northwest)
of the Site than the City impound lot north of 500 South. The closest downgradient well,
located approximately 400 yards northwest of the Site, has not been sampled. No
groundwater sampling has been conducted since June 2000. The present extent of
downgradient arsenic groundwater contamination is therefore unknown.
4.3 SOIL EXPOSURE PATHWAY
4.3.1 TARGETS
The Redwood Road Dump is enclosed by chain link and barbed wire fences. This barrier
prevents unauthorized vehicle access (DERR, 2010a). There is no on-site population or
residences. There are no schools or day cares located within 200 feet of the site.
4.3.2 SUMMARY OF PAST RESULTS
4.3.2.1 UDOT 197 7 Preliminary Inspection
One rotary hole and 19 auger holes were drilled into the landfill from April toMay L977.
Forty three refuse (soil) samples were analyzedfor total solids, volatile solids, BOD, and
moisture content. Explosive gas concentrations were measured for a few holes in April
L977 and measured twice in May 1977 for all holes at various depths. Borehole
explosive gas concentrations ranged from zero to 27 percent by volume (Eckoff, 1977).
Explosive gas concentrations are provided as Appendix C, Table 1.
Several locations repeatedly yielded methane concentrations above the lower explosive
limit (LEL). Two of the sampling locations showed methane concentrations above 10
percent by volume. In 12 of the 20 borings, petroleum products were found at or near the
water table. One of the drill holes, G-3C, cited the presence of a "chemical waste" at a
depth of 8-10 feet. Thickness of the refuse in the landfill was determined to vary
between one foot and29 feet, with the refuse-natural ground interface undulating
between elevations of 4216-4224 feet above sea level.
4.3.2.2 DERR 1991 Site Inspection
Ten soil samples were collected numbenng RD-SO-0I through RD-SO-l0. Sample
locations are shown in Appendix C, Figure 5 and 5a. Eight of the ten were surface
samples. Sample RD-SO-02 is the background sample. Samples RD-SO-06 and RD-SO-
07 can be considered source samples of "oily waste" taken near the water table from
monitoring wells MW- 2 and MW-4. It does not appear that these two samples were
submitted for inorganic analysis. Sample results can be found in Appendix C, Tables 5-
6.
Appendix C, Tables 5 and 6 summarize the analyical data results for soil and sediment
samples. Site soils contain above background concentrations of 21 BNA compounds,
five VOA compounds, 12 pesticide compounds, and one PCB compound. None are
above SCDM benchmarks. The PCB compound, aroclor-1260, was detected in RD-SO-
09 at 150 ppb. Table 6 indicates a release of at least 10 metals to the soil has occurred at
the Site. Concentrations of barium, calcium, chromium, copper, iron, lead, mercury,
nickel, sodium, and zinc were detected over three times that of the background sample.
None were above SCDM benchmarks. However, lead has no established SCDM
benchmark. Lead was detected in sample SO-10 at2,610 mdkg in the northern corner of
the western landfill. This sample was taken directly above the refuse inside a hole
previously used to excavate old bottles about three feet below ground surface.
4.3.2.3 DERR 2000 Targeted Brownfields Assessment
Soil samples were collected during installation of the direct push groundwater samples
and from selected trench locations across the Site. Soil samples were collected directly at
the soil/water interface. Most soil samples were collected between seven to nine feet
below ground surface. Soil sample locations are provided as Appendix D, Figure 1 and
provide 2008 satellite imagery for the sample locations.
Lead was reported in sample T-3 at 1,760 mglkg. Lead was reported in sample SB-2 at an
estimated concentration of 1,930 m/kg. Poly nuclear aromatic hydrocarbon compounds
were detected from the base of a trench cut (SB-2) along the central portion of the east
bench. Soil samples collected from the base of the 10 foot trench cut revealed benzo (a)
pyrene at 5,000 ug/kg and dibenz (a,h) anthracene at 1,000 udkg. The SCDM CRSC for
both compounds is 880 udkg. Selected figures from the study are provided in Appendix
D. Figure 4 is the original report sample map identifying the benzo (a) pyrene
concentrations found in soil samples from the western landfill. Figure 4a is the historic
report sample map detailing the lead concentrations at the western landfill.
No VOCs, SVOCs or PCBs/Pesticides were detected in any other samples above SCDM
benchmarks or the EPA Region 3 commercial/industrial soil screening criteria. Arsenic
was reported in all soil samples collected from the western landfill. The highest reported
concentration was 43.9 mg/kgwith the remaining concentrations ranging from 6.0 mdkg
to 25 mgkg.
4.3.3 DATA GAPS
Only limited subsurface soil hazardous constituent analysis has been conducted for the
eastern landfill.
4.4 SI.IRFACE WATER PATHWAY
4.4.1 TARGETS
There are no surface drinking water sources within the 15 mile target distance limit.
Surface waters are not used for fishing within 15 downstream miles. A wetland
environment exists at the Great Salt Lake which is approximately l0 miles downstream
of the Site (Appendix B, Figures on pages 10 and 11). Approximately 50 miles of
wetland frontage occur within the 15 mile target distance limit (USDI, 1990). Several
duck hunting clubs are located within these wetland areas (DWLR, 2010). The Site is
located in a 100 year flood zone (FEMA, 2010).
4.4.2 SUMMARY OF PAST RESULTS
4.4.2.1DERR 1991 Site Inspection
Three surface water samples were collected at the Site, as well as three sediment samples
(see Appendix C, Figure 5 and 5a). A quality control trip blank water sample was also
taken. Upgradient and downgradient water samples were collected from the City Drain
and a water sample was taken from the unnamed north ditch. The up-gradient City Drain
sample served as the background sample. Sediment samples were taken in the same
general location as the surface water samples.
Surface water sample results tables from this investigation are provided in Appendix C
(Tables 3-6). The SCDM surface water environmental pathway benchmark for acute
exposure is the Criteria Maximum Concentration (CMC) and the benchmark for chronic
exposure is the Criterion Chronic Concentration (CCC). The environmental toxicity of
metals in surface water depends upon water hardness. As the water hardness of the City
Drain has not been determined, the default CMC and CCC values for a water hardness of
100 mg/L is provided. Lead was detected in the north ditch sample at23.6 ltglI-. The
CMC for lead is 65 ltgtL and the CCC for lead is 2.5 pglL. Antimony was detected at25
1tg[LfromRD-SW-02. No CMC or CCC for antimony has been established. Arsenic
was also detected in the upgradient City Drain sample at 53.4 ltgll- and in the
downgradient sample at 59.2 p.g& (CMC = 340 tLgL, CCC = 150 pglL).
Appendix C, Table 5 identifies the 11 BNA, six pesticide and two VOA compounds that
were detected in the sediment samples. The majority of these contaminants were
detected in the north ditch, indicating they most probably originated from the landfill.
10
The north ditch sediment sample contained three metal concentrations that were more
than three times the concentration in the upgradient City Drain sediment sample. These
metals include lead (68.2 mdkg), magnesium (33,000 mdkg) and zinc (222 mglkg).
4.4.2.2 DERR 2000 Targeted Brownfields Assessment
Surface water samples RRD-SW-I, RRD-SW-Z andRRD-SW-3 were collected from the
City Drain which borders the western landfill on the east. RRD-SW-4 was collected
from the northern portion of a possible wetland area identified on the central portion of
the eastern landfill. RRD-SW-5 was a duplicate of RRD-SW-4.
Appendix D, Tables 3,6,9 and llsummarize the surface water analytical results.
Arsenic was reported in the southernmost (background) surface water sample (RRD-SW-
1) at 61 pglL, in RRD-SW-Z at79.7 lrdL and in RRD-SW-3 at82.8 pglL. All measured
surface water arsenic concentrations were below the CMC QaU pdL\ and the CCC (150
pglL). Lead increased from the background non-detect concentration to 56.1 1tglL at
RRD-SW-2 and 50.3 ltglL at RRD-SW-3 (CMC = 65 p"dL, CCC = 2.5 pelL). No other
metals were reported above SCDM benchmarks.
4.4.3DATA GAPS
Determining the appropriate metal toxicity benchmark requires knowing the average
hardness of City Drain surface water. This value has not yet been determined.
4.5 AIR MIGRATION PATHWAY
4.5.1 TARGETS
There is no on-site population or residences at the Redwood Road Dump. There are no
schools or day cares located within 200 feet of the site. There is a population of 130,095
within the four-mile Target Distance Limit (DERR,2010b). Table 3lists the target
population within various distances. Both western and eastern landfills are fenced. Two
means of access are available to the eastern landfill; one is from the north through a gate
which is locked at night, and one from the south through a road barrier. Approximately
50 miles of wetland frontage occur within the 15 mile target distance limit (USDI, 1990).
Table 3
Population Totals within Four Miles
of the Redwood Road Dump
Distance Population
Cumulative
Ponulation
0.25 M les 50 50
0-0.5 M les 2.202 1 )<1
0.5-1M les 8.644 10,896
t-2M les 23,053 33,950
2-3M les 33,186 61,136
3-4 M les 62,959 130.095
11
4.5.2 SUMMARY OF PAST RESULTS
4.5.2.1 UDOT 197 7 Preliminary Inspection
One rotary hole and 19 auger holes were drilled into the landfill from April toMay 1977.
Explosive gas concentrations were measured for a few holes in April 1977 and measured
twice in May 1977 for all holes at various depths. Several locations repeatedly yielded
methane concentrations above the lower explosive limit (LEL).
4.5.2.2 DERR 2000 Targeted Brownfields Assessment
Soil gas samples were collected from two locations along the eastern bench of the
western landfill in accordance with the protocol established in the TBA Workplan and
analyzed for methane. Methane was reported in SG-l at23,000 ppmv (46 percent of the
lower explosive limi|. Methane was not reported in SG-2 above the level of detection.
4.5.3 DATA GAPS
None identified.
5.0 SIJMMARY AND CONCLUSIONS
The Site was the primary landfill for Salt Lake City from 1923 untll1962 and is
estimated to contain approximately 1,340,000 cubic yards of refuse and fill. The Site was
reported to take in household, commercial and industrial wastes. I-215 was constructed
through the center of the Site in 1988 creating an eastern and western refuse pile. The
refuse and cover material in the interstate right-of-way was moved to the east pile during
the construction. Thickness of the refuse in the landfill varies between one foot and29
feet, with the refuse-natural ground interface undulating between elevations of 4216-4224
feet.
Chromium and lead contaminated soils were illegally placed on the central part of the
eastern landfill some time during December of 1991. The contaminated soils were
removed from the landfill in November 7997.
The northern portion of the western landfill is used for Salt Lake City's automobile
impound lot. Salt and gravel are stored on the southern portion of the western landfill.
The eastern landfill is elevated about 10 feet above the natural ground surface and is
covered with soil and natural vegetation. The eastern landfill is about 300 yards wide and
400 yards long. Various materials are being stored on a flat area northeast of the eastern
landfill.
A City vehicle washing and refueling facility is under construction on City property
northwest of the eastern landfill. Plans are being considered to extend this asphalted area
further north and convert the area into a temporary model airplane airport. Snow cleared
T2
from downtown Salt Lake City in the winter is placed on the highest portion of the
eastern landfill by City streets personnel.
The Portland Cement Superfund site is located directly south of the eastern landfill and
south of Indiana Avenue. Semiannual monitoring of the contaminated groundwater
beneath the Portland Cement site indicates that the shallow aquifer contaminant plume
continues to be contained within the Portland Cement site boundaries.
The 1991 SI and 2000 Tareeted Brownfields Assessment have established the followins:
o Soil - Concentrations of barium, calcium, chromium, copper, iron, mercury,
nickel, sodium, and.zinc were detected in surface soils over 3 times that of the
background sample. In particular, lead was detected in the subsurface soils as
high as 2,610 mdkg.
Concentrations of benzo (a) pyrene (5,000 pglkg and dibenz (a, h) anthracene
(1,000 pglkg were identified in subsurface soils above SCDM benchmarks. The
SCDM CRSC for both compounds is 880 pglkg. There is no on-site population
or residences at the Redwood Road Dump. There are no schools or day cares
located within 200 feet of the site.
o Groundwater - The presence of arsenic (I,290 pgL) antimony (34.2 1t"glL),
selenium GaS pg\-), pentachlorophenol (3 pglL) have been found in Site
groundwater above SCDM benchmarks. Arsenic contamination above the l0
1.tgll- groundwater MCL is widespread. However, the closest downgradient
well, located approximately 400 yards northwest of the Site, has not been
sampled. The extent of downgradient groundwater contamination to the
northwest is, therefore, unknown. Seventeen municipal wells from three cities are
located within the four mile target distance limit. All are located east or south of
the Site and hydraulically upgradient. All downgradient wells are privately
owned.
o Surface water - The City Drain Canal bisects the site. Water from the canal
eventually enters the Great Salt Lake at Farmington Bay Wildlife Refuge
approximately 10 miles downstream of the site. Approximately 50 miles of
wetland frontage occur within the 15 mile target distance limit (USDI, 1990).
Several duck hunting clubs are located within these wetland areas. There are no
surface drinking water sources within the 15 mile target distance limit of the Site.
Surface waters are not used for fishing within 15 downstream miles.
City Drain Canal surface water lead concentrations rise from a non-detectable
background concentration to a high of 59.2 ltglL downstream of the Site. This
concentration significantly exceeds the surface water CCC of 2.5 pglL. However,
although elevated levels of lead have been detected in subsurface site soils,
elevated levels of lead have not been detected in Site sroundwater. Arsenic levels
t3
increase from a background concentration of 6l L+glL to 82.8 pgll downstream of
the Site.
6.0 REFERENCES
Ashcroft, G.L., D.T. Jensen, and J.L. Brown, 1992,Utah Climate.
Eckoff, David W.,1977. Preliminary Investigations Disposition of Garbage Materials in
Abandoned Landfill. (Submitted to Utah Department of Transportation).
Federal Emergency Management Agency (FEMA), Flood ZoneMap for Salt Lake City,
Utah, 1986, at fema.gov, checked April 8, 2010.
Salt Lake City Parks, 2010, personal conversation with Val Pope (Pope), Director, March
22.2010.
Superfund Chemical Data Matrix (SCDM), USEPA, 28 January 2004.
Terracon, 1997, Soil Removal and Sampling Report, Tool Design Engineering and
Manufacturing Inc. Indiana Landfill Site Salt Lake City, Utah Terracon Project Number
61967 065,December 4, 1997 .
U.S. Department of the Interior (USDD (1990), Fish and Wildlife Service, National
Wetlands Inventory Maps of Salt Lake City North, Utah, 7.5 minute quadrangle.
U.S. Geological Survey,1962,7.5 Minute Topographic Map, Salt Lake City North, Utah.
U.S. Geological Survey (USGS) Water Annual Statistics for the Nation website:
http://waterdata.usss. gov/usa/nwis/sw and visited December 8, 2009.
U.S. Environment Protection Agency (USEPA), lgg8,Portland Cement Superfund Site,
Salt Lake City, Utah, Record of Decision Operable Unit Three-Groundwater, August 17,
t998.
U.S. Environment Protection Agency Region VIII (USEPA),1992, Site Inspection
Decision Sheet, January 27,1992, Redwood Road Dump.
Utah Bureau of Solid and Hazardous Waste, 1987. Preliminary Assessment, Redwood
Road Dump, Salt Lake City, utah, uTDgg0g61502.
Utah Division of Drinking Water (DDw) (2010a) geographic information system
database reviewed April 12, 2010.
Utah Division of Drinking Water (DDW) (2010b) public water system database reviewed
April 12,2010.
utah Division of Environmental Response and Remediation,1992. Analytical
Results Report, Redwood Road Dump Site, Salt Lake City, Utah, UTD980961502.
15
Utah Division of Environmental Response and Remediation (DERR), 1995, Site
Inspection Prioritization Redwood Road Dump Site, Salt Lake County, Utah,
UTD98096 1502, September 27, 1995.
Utah Division of Environmental Response and Remediation (DERR), 2001, Targeted
Brownfields Assessment and Analytical Results Report, Utah Division of Environmental
Response And Remediation Western Portion of the Redwood Road Dump and the Salt
Lake City Road Maintenance and Automobile lmpound Lot, Salt Lake County, Utah
William L. Rees, September 5,200I.
Utah Division of Environmental Response and Remediation (DERR), 2007, Semiannual
Monitoring Report, Portland Cement Site OU #3, Salt Lake City, Utah. October 2007.
Utah Division of Environmental Response and Remediation (DERR), 2010a, Site Visit
for Redwood Road Dump, March 9 and 22,2010.
Utah Division of Environmental Response and Remediation (DERR); 2010b, Census
2000 data, GIS layer name: pop_blkgrp.shp.
Utah Division of Solid and Hazardous Waste (DSHW) Tool Design Site Files reviewed
April T, 20L0.
Utah Division of Water Rights (DWR); 2010, Water Rights Points of Diversion Data.
Utah State Geographic Information Database (GIS) layer name: wrpad.shp, Accessed
Apnl 12,2010.
Utah Division of Wildlife Resources (DWLR), 2010, Farmington Bay Waterfowl
Management Area
http://wildlife.utah.eov/habitat/farmington bay.php accessed Apf.l t2,20IA.
Waddell et al,1987; K.M. Waddell, R. L. Deiler, Melissa Santini, and D.K. Soloman;
Ground-Water Conditions in Salt l^ake Valley, Utah, 1969-83, and Predicted Efficts of
Increased Withdrawals from Wells; State of Utah, Department of Natural Resources,
Technical Publication No. 87.
T6
FIGURES
f] site Boundary
by: Neil B. Taylor
0.25 0.125 0 0.25 Milesm Utah Department ot
Environmental Quality
Division of Environmental
Figure I
Site Location Map
Redwood Road Dump Site
Salt Lake County, Utah
City Drain
400 200 0 400 Feetm Utah Department of
Environmental Quality
Division of Environmental
Figure 2
Site Map
Redwood Road Dump Site
Salt Lake County, Utah
X X X
X X X
X X X
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o o o
I
bI
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APPENDIX A
SITE VISIT REPORT
SITE VISIT REPORT
For the Redwood Road Dump
CERCLIS ID UTD98O9615O2
On March 9 and 22,2010 Neil Taylor with the Utah Department of Environmental
Quality, Division of Environmental Response and Remediation conducted a site visit of
properties associated with the investigation of the Redwood Road Dump (Site). This
report describes the Site visits. Supporting photographs can be found at the end of the
visit description. on March 22, Neil Taylor was accompanied by val Pope, Parks
Division Manager with the Salt Lake city Department of Public Services.
The Site is located between 500 South on the North and Indiana Avenue on the South and
from 1900 West on the East to 2200 West on the West. The Redwood Road Dump
consists of westem and eastern covered landfills. Historically the landfills were one unit
but are now bisectedby l-215. Both landfills are covered with soil and vegetated with
native grasses.
We first entered the eastem landfill using an access road located directly behind the Parks
Division building which is located at 1963 West 500 South. Various materials are being
stored on the flat area northeast of the elevated and covered eastern landfill. Some of
these materials include soil from the city cemetery, wooden posts, large flowerpots for
decorative use downtown, and large utility poles.
A city vehicle washing and refueling facility is under construction just northwest of the
eastem landfill. Trees limbs and leaves are chipped up on a large asphalted area
southeast of the eastem landfill. This material is later hauled to the county landfill for
composting. Snow cleared from downtown in the winter is dumped on the highest
portion of the eastern landfill. An area on the elevated eastem landfill has been leveled
and covered with clay and gravel for this purpose.
An open ditch runs north northeast from the Southeastern property drainage to behind the
Parks Division building. The drainage is then piped from the Southwest quarter of the
Parks building to a storm drain on 500 South. The "North Drain" described in previous
site investigation reports, no longer appears to exist.
The narrow, elevated, western portion of the landfill is located just west of I-215 and the
City Drain canal and east of a variety of city and private properties running down Delong
Street (2105 West). A row of commercial businesses are located on the northern portion
of Delong Street. The city impound lot is located east of these properties. The northem
half of the western landfill is located east of the city impound lot.
The Salt Lake City Streets Division owns the southern half of Delong Street. This
includes the southern half of the western landfill. The elevated southem half of the
landfill is being used for storage of a variety of gravel used in street repair and tree limbs.
Figure I
Looking
southwest on site
access road, east
of the eastern
landfill. Soil
piles are from
city cemetery.
Elevated area in
the background is
the eastern
landfill.
Figure 2
Stored logs in
front of raised
edge ofeastern
landfill.
ry;i
Figure 3
City vehicle
washing and
fueling facility
under
construction
north of the
eastem landhll
(looking south).
Figure 4
Large truck
washing facility
north of the
eastem landfill.
Elevated area in
the background is
the eastem
landfill (looking
south).
Figure 5
An asphalted area
located southeast
of the eastem
landfill and used
for storage of
chipped trees,
limbs and leaves
(looking
northeast).
Figure 6
Northem end of
the western
landfill located
next to I-215 and
east of the city
impound lot in
the foreground
(looking
southeast).
Figure 7
Looking east at
the high-voltage
power poles
installed through
the top of the
western landfill.
Observation point
is from the city's
storage yard
located directly
west of the
westem landfill.
Figure 8
Looking
northeast from
the Salt Lake City
Streets Division
Delong storage
yard to the
cleared summit of
the western
landfill. Note the
pile of vegetation
stored at the top
of the westem
landfill.
APPENDIX B
EPA PRELIMINARY ASSESSMENT WORKSHEET
EPA PRELIMINARY ASSESSMENT WORKSHEET
PREPARER'S NAME: Neil Taylor
SITE NAME: Redwood Road Dump
DATE: ,Ju1y 19, 2011-
B-1
PA Worksheet
Page 2
I{AiIOR CONSIDERATIONS
A) DOES ANY QUALITATIVE OR QUANTITATIVE INFORMATION EXIST THAT MAY INDICATE AN OBSERVED
RELEASE To ArR, GRoUNDWATER, sorr. oR sttRFAcE wATER? X yEs I uo
Describe: A 1991 Site Investigation (SI) identified the presence of 21 Base Neutral
Extractable (BNA) compounds, five Volatile Organic Compounds (VOCs), 12 pesticides and
aroclor -1260, a PCB compound. Widespread arsenic contamination above the 10 ,tg/L
drinking water MCL was found in shallow groundwater. Analytical results from a 2001
TargeEed Browndsfield Assessment (TBA) for the western portion of the Site revealed
1eve1s of benzo (a) pyrene as high as 5,OOO mg/kg in soil and lead in soils at
concentrations rangj-ng from 204 mg/kg to l-750 mg/kg Dissolved arsenic was reported in the
groundwat,er at concentrations as high as 1,290 pg/L
C) ARE THERE SENSITIVE ENVIRONMENTS WITHIN A -MILE RADIUS OR ]-5 DOWNSTREAM MILES OF
THE SITE? X YES N NO IF YES, DESCRIBE IF ANY OF THE FOLLOWING APPLY:
l-) Multiple sensitive environments? A wetland environment exisEs at the Great Salt
Lake which is 1-0 miles downstream of the site. Approximately 50 miles of wetland
frontage occur wit,hin the t,arget distance l-imit, (USDI, 1-990). Several duck hunting
clubs are located within these wetland areas.
2) Federally designated sensitive environment (s) ? Site drainage enters the Great
SaIt, Lake at Farmington Bay Wildlife Refuge.
3) Sensitive environment(s) downstream on a small or slow flowing surface waLer
body? Wetlands are located along the perifery of the Great Salt Lake as described in
question 1.
B) IF THE ANSWER TO #1 IS YES, IS THERE
OR ANY OTHER TARGET CONTAMINATION (i
environments)? ! vrs. X No
Describe:
EVIDENCE OF DRINKING WATER SUPPLY CONTAMINAT]ON
.e. food chain, recreation areas, or sensitive
Xno
OR PARTIALLY WITHTN A WELLHEAD PROTECTION AREA AS
r-428 OF THE SAFE DRTNKTNG WATER ACT? n YES x UO
D) IS THE SITE LOCATED IN AN AREA OF KARST TERRAIN? n YES
Describe:
E) DOES THE WASTE SOURCE LIE FULLY
DESIGNATED ACCORDING TO SECTION
Describe: _
F) DOES AI{Y QUAIITATIVE OR QUANTITATIVE fNFORMATION EXIST THAT PEOPLE LIVE OR ATTEND
scHool oN oNsrrE CoNTAMTNATED pRopERTy? n yEs X wo
B-2
PA Worksheet
Page 3
Describe:
SITE INFORIIATION
L. SITE NAME: Redwood Road Dump
ADDRESS: 2000 West Indiana Ave
CITY: Salt Lake Ci-ty COUNTY: Salt Lake STATE: UT
ZIP: 84L04 EPA ID: UTD98096L502 LATITUDE: 40 45 l-8 LONGITTTDE: l-l-l- 56 52.5
2. DIRECTIONS TO SITE (From nearest public road) ; In SaIt Lake City, proceed west from
Redwood Road and 500 South to 500 South and 2000 West.
3. STTE OWNERSHIP HISTORY (Use additional sheets, if necessary):
A. Name of current owner: SaIt Lake Citv Cornoration
Address: 2001- South State St Suite S4400
City: Salt Lake City County: Salt Lake
State: 0 Zip: 84L90 Dates: From L923 To Present
Phone z 9Q:-.-458-2299
B. Name of previous owner:
Address:
City: County:
State: _ Zip:
Phone:
C. Name of previous owner:
Address:
City: County:
State: 0 Zip:
Phone:
D. Name of previous owner:
Address:
Dates: From To
Dates: From To
B-3
PA Worksheet
Page 4
City: County:
State: 0 Z!p: _ Dates: From _ To
Phone:
Source of ownership data: BSHW, 1987
4. TYPE OF OWNERSHIP (Check all t,hat apply) :
E Private ! state [l uunicipal l-l Federal n County
I Other (describe) ' _
5. NAME OF SITE OPERATOR: Val Pope, Director, Salt Lake City Parks
Address: 1955 West, 500 South
City: Sal-t, Lake City County: Sal-t Lake
State: 0 Zip: 84101 Dates: From _ To
Phone: 801-- 972-7800
BACKGROT IID/OPERATTNG HI STORY
6. DESCRIBE OPERATING HISTORY OF SITE: the Site was the primary landfill for Salt Lake
City from l-923 until l-952. The Site is estimated t.o contain approximatefy 1,3.40,000
cubic yards of refuse and fill. The Site was reported to take in household,
commercial and industrial wastes. I-215 was constructed through the center of the
Site in 1988 creat,ing an eastern and western refuse pi1e. The refuse and cover
material in the Interstate right-of-way was moved to the east pile during the
construction. Thickness of the refuse in the landfill varies between one foot and 29
feet, with the refuse-natural ground int,erface undulating between elevations of 4216-
4224 feeE.
Source of information: BSHW, L987: DERR, L995; Eckoff, L977
7. DESCRIBE THE NATURE OF SITE OPERATIONS (property size, manufacturing, waste disposal,
storage, etc.): The northern port,ion of the western landfill is used for the City's
automobile impound IoE. Salt and gravel are stored on the southern portion of the
western landfill. The eastern l-andfill is elevated about 1-0 feeE above the natural
ground surface and is covered with soil and natural vegetation. The landfill is about
300 yards wide and 400 yards fong. Various mat,erials are being stored on a flat area
northeast, of the eastern landfill.
Source of information: DERR, 2010a; Terracon, L997
B-4
PA Worksheet
Page 5
8. DESCRIBE ANY EMERGENCY OR REMEDTAI ACTIONS THAT HAVE OCCURRED AT THE SITE: ChTOMiuM
and lead contaminated soils were illegal-l-y placed on the central part of the eastern
l-andf iII some time during December of l-991-. The cont,aminated soils were removed f rom
the landfill in November l-997. Several drums were removed on August l-0, 1993 that
contained investigation derived wast,es from monitoring wel-l- installation by EPA
contractors during sampling activities in the spring of L991.
Source of information: Terracon, L997; DERR, ]-995
9. ARE THERE RECORDS OR KNOWLEDGE OF ACCIDENTS OR SPILLS INVOLVING STTE WASTES?
!vrs XNo
Describe:
Source of information:
DISCUSS EXISTING SAMPLING DATA AND BRIEFLY SI]MMARIZE DATA OUALITY (e.9., Sample
objective, age/comparabitity, analytical- methods, detections limits and QAIQC):
Samples collecLed during the l-991 SI and 2001 TBA were col-lected according to the EPA
protocofs and analvzed at, EPA contract laboratories. Data collected from the site was
validated by EPA or EPA contractors.
Source of informat,ion: DERR, L992; DERR 200L
wAsTE CONTAINMEM/HAZARDOUS SUBSTAI{CE IDETiITIFICATION
1l-. FOR EACH SOURCE AT THE SITE, SIJMMARIZE ON TABLE 1 (attached): l-) Methods of hazardous
substance disposal, storage or handling; 2) size/volume/area of all features/
structures that, might cont,ain hazardous waste,- 3) condition/integrity of each storage
disposal feature or structure; 4) types of hazardous subsLances handled.
12.BRIEFLY EXPLAIN HOW WASTE QUANTITY WAS ESTIMATED (e.9., historical records or
manifests, permit applications, air photo measurements, etc.): A report entitled
"Preliminary Investigations Disposition of Garbage Materials in Abandoned Landfill"
(PI) was prepared for the Utah Department of Transportation (UDOT), Salt Lake Citv,
Utah, by Dr. David W. Eckhoff in Ju]y of l-977. rhe investigation found that mixed
garbage and refuse had been dumped and burned on the site. Twenty auger holes were
drilled into t,he landfill from which the volume and type of waste was cal-culated.
Source of information: Eckhoff. L9'17
l-3. DESCRIBE ANY RESTRTCTIONS OR BARRIERS ONACCESSIBILITY TO ONSITE WASTE MATERIALS: Both
east and west l-andfills are fenced and access restricted
B-5
Source of Information: DERR, 201_0a
PA Worksheet
Page 6
GROI'IIDWATER CHARACTERI STICS
14. TS THERE A}IY POSITIVE OR CIRCT]MSTANTIAL EVIDENCE OF A RELEASE TO GROI]NDWATER!
Ivns nuo
Describe: fn l-991-, arsenic was detected at 3l-4 &g/L, 248 pg/L and 179 pg,/L in three of
four downgradient we1ls compared to 19 pg/L in a background well. Antimony was
detected at'34.2 pg/L in one well and above background concentrations. In 2000,
arsenic was detected in manv groundwater samp]es above the MCL of 10 pr.g/L. Arsenic
was found at l-,290 pg/L and at L,000 pg/L in two sample wells locaEed north of the
Site. Dissolved arsenic was reported in on the western edge of the western fandfill
aE an estimated concentration of l-,1-70 pg/L. other groundwater samples ranged from
2.4 uq/L Lo 236 uq/L
Source of information: DERR t992 DERR, 2OOL
L5. ON TABLE 2 (attached), GIVE NAMES,
HYDROGEOLOGIC UNITS UNDERLYING THE
DESCRIPTIONS, AIitrD CHARACTERISTICS OR GEOLOGIC/
SITE.
16. NET PRECIPITATION: 2 inches
Source of information:Ashcroft L992
SURFACE WATER CHARACTERISTICS
17. ARE THERE SURFACE WATER BODIES WITHIN 2 MILES OF THE SITE?
Ditches I r,akes I eond l-l creeks f] Rivers
Other (Describe) Canal-s
18. DISCUSS THE PROBABLE SURFACE RLINOFF PATTERNS FROM THE SITE TO SURFACE WATERS: The
Surplus Canal and the City Drain are located in close proximitv to the site. The
"North Ditch" drains the City property northeast of the east,ern l-andfill. The ditch
is piped to a storm drain that flows to the City Drain. The City Drain is located
west of I-215 and just, east of the western landfill. The City Drain is the primary
groundwater discharge point. The Citw Drain joins th€ Sewer Canal approximately six
miles to the north. The Sewer Canal eventually discharges into Ehe Great Salt Lake
approximatelv l-0 miles downstream of the Site. The Surplus Canal is located
approximately 1,000 feet to the west of the Site. The discharge points for the
Jordan River, the Surplus Canal and the Sewer Canal into the Great SaIt Lake are
characterized by freshwater marshes. The discharge points are withj-n the confines of
the Farmington Bay Waterfowl Management Area
]-9. PROVIDE A SIMPL]FIED SKETCH OF SURFACE RI]NOFF AND SURFACE WATER FLOW SYSTEM FOR 15
DOIIINSTREAM MILES (see item #35) .
X
X
B-6
PA Worksheet
Page 7
20. IS THERE ANY POSITIVE OR CIRCT]MSTA}ITIAL EVIDENCE OF SURFACE WATER CONTA},IINATION?
ffives nNo
Describe: Arsenj-c was reported in the backgrgund City Drain water sample at 61 Pg/L
and at 82.8 pg/L downstream of t,he Sit,e. Lead rose from the background non-detect
concentraEion to 56.1 pg/L downstream of the Site.
Source of information: DERR, 2000
21-. ESTIMATE THE SIZE OF THE UPGRADIENT DRAINAGE AREA FROM THE SITE: UNKNOWN ACTES
Source of information:
22. DETERMINE THE AVERAGE ANNUAL STREAM FLOW OF DOWNSTREAM SURFACE WATERS
Water Body: City Drain Flow: l- cfs
Water Body:FIow: cfs
23. rS THE SrrE OR PORTTONS THEREOF LOCATED rN SURFACE WATER? n YES x NO
24. rs rHE srTE LoCATED rN A FLooDpLATN X yEs n lqo (indicate flood frequency)? l-00 yr
25. IDENTIFY A]lrD LOCATE (see item #35) AIiIY SURFACE WATER RECREATION AREA WITHIN 15
DOIINSTREAM MILES OF THE SITE: The Great, Sal-t Lake is used for recreational boating and
waterfowl huntinq.
26. TWO YEAR 24-HOIJR RAINFALLz 1-.79
Source of information: Ashcroft, ]-992
TARGETS
27. DISCUSS GROLINDWATER USAGE WITHIN FOUR MILES OF THE SITE: Seventeen municipal wells
from three cit,ies are located within the 4-mile target distance range. Af1 are
locat,ed east or sout,h of the Site and hvdraulically up-gradienE. Approximately 4,102
underground points of diversion are located within four miles of the Site. The uses
for the large majority are for "domestic" or irrigat,ion purposes and most are
upgradient of the Site. The closest downgradienL well is approximately 400 vards
northwest of the site, north of 500 South and east of the surplus canal. The well is
2 inches in
Source of information: DDW, 201-0a; DDW, 2010b; DWR, 20LO
B-7
PA Worksheet
Page I
THE POPULATION SERVED BY GROI]NDWATER ON THE TABLE
DISTAIICE (miles)POPULATION CI'MUI.ATIVE POPUI,ATION
O-yr 50 50
,(-%2202 2252
%-L 8544 108 95
L-2 230s3 339s0
2-3 33185 671,36
3-4 62959 l_30095
Source of informaEion: DDW, 201-0a
29. IDENTIFY AND LOCATE (see item #35) POPULATION SERVED BY SURFACE WATER INTAKES WITHIN
15 DOI,TINSTREAM MILES OF THE SITE: O
Source of information: DDW, 2010b
30. DESCRIBE AND LOCATE FISHERIES WITHIN 15 DOI,TINSTREAM M]LES OF THE SITE (i.C., PrOVidC
standing crop of production and acreagte, etc.): None
Source of information: USD], 1990; UtahFishing, 2010
31. DETERMINE THE DISTANCE FROM THE SITE TO THE NEAREST OF EACH OF THE FOLLOWING LAND USES
Deseription Dietance (Miles)
Commerc j-a1 / Indust rial / Ins t i tut ional 0
Single Family Residential 0
MuIti - Family Residential 0
Park t-
Agricultural 3
Source of informat,ion: DERR, 2010a
32. STJMMARIZE THE POPULATION WITHIN A FOUR-MILE RADIUS OF THE SITE:
B-8
DISTAIICE (nileE)POPUI.ATION EI'MUI,ATIVE POPULATION
o-rl 50 50
Yr-%2202 2252
%-L 8644 L0896
L-2 23 053 339s0
2-3 331_86 67L36
3-4 629s9 L3 00 95
Source of informaLion: DERR, 2010b
OTHER REGULATORY IM/OI,VEMENT
33. DISCUSS ANY
County: None
State: None
Federal: None
Other: None
Source of information:
B-9
PA Worksheet
Page l-0
34. SKETCH OF SITE
Include aII pertinent features, €.9., we11s, storagte areas,
waste areas, buildings, aqcess roads, areas of ponded water,
sheets with sket,ches of enlarged areas, if necessary.
underground storage tanks,
etc. Attach additional
tft* Ilepaucot d
Em'irucatal Qudtt''XlivisioaofElvirwtd
Figure I
SiteLocatioMap
RcdroodRodDury Site
sdrl&cGdy,ud
B-10
PA Worksheet
Page 11
35. SURFACE WATER FEATURES
Dvnrr.iAa : ci-nr; fied sketch of t.he surface runof f and surface water f 1ow syst.em for 15
downstream miles. fnclude all pertinent features, e-9., int.akes, recreation areas,
fisheries, gauging stations, etc.
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Page l-4
REFERENCES
Ashcroft, G.L., D.T. Jensen, and ,J.L. Brown, L992, ULah Climate
Eckoff, David W., L977. Preliminary Investigations Disposition of Garbage Materials in
Abandoned Landfi1l. (Submit,ted to Utah Department of Transportation)
Salt Lake City Parks and Recreation, 20L0, personal conversation with a VaI Pope,
Director, March 22, 2010
Terracon, L997, Soil- Removal and Sampling Report, Tool Design Engineering and
Manufacturing fnc. Indiana Landfill Site Salt Lake City, Utah Terracon Project Number
61967065, December 4, L997
U.S. Department of the Interior (USDI) (1990), Fish and Wildlife Service, National
Wetlands Inventory Maps of Salt Lake City North, Utah, 7.5 minute quadrangle.
Utah Division of Environmental Response and Remediation, L992. Analytical
Resu1t,s Report, Redwood Road Dump Site, SaIt Lake City, Utah, UTD980961502
Utah Bureau of Solid and Hazardous Waste, 1-987. Preliminary Assessment, Redwood
Road Dump, Sah Lake City, Utah, UTD98096I-502
Utah Division of Drinking Water (DDW) (201-0a) geographic information system database
reviewed April 1-2, 2010
Utah Division of Drinking Water (DDw) (2010b) public water system database reviewed April
L2, 201,0
Utah Division of Environmental Response and Remediation (DERR) , 2OOl, Target,ed
Brownfields Assessment and Analytical Results Report Utah Division of Environment,al
Response And Remediation western Port,ion of the Redwood Road Dump and the Salt Lake
City Road Maintenance and Automobile Impound Lot, SaIt Lake County, Utah WiIIiam L.
Rees, September 5, 2001-
Utah Division of Environmental Response and Remediation (DERR) , 2OOl Analytical- Resul-ts
Report, Redwood Road Dump SaIt Lake City, Utah, January l-4, ]-992
Utah Division of Environmental Response and Remediation (DERR) , 1995, Site Inspection
Prioritization Redwood Road Dump Site, Salt Lake County, UEah, UTD980951-502, September
27, L995
Utah Division of Environmental Response and Remediation (DERR) , 2OlOa, SiEe Visit for
Redwood Road Dump, March 9 and 22, 201-0
Utah Division of Environmental Response and Remediation (DERR) i 2010b, Census 2000 data,
GIS layer name: pop_blkgrp.shp
Utah Division of Wat,er Rights (DWR); 2OLO, Water Rights Points of Diversion Data. Utah
State Geographic Information Database (cIS) layer name: wrpad.shp, Accessed April 12,
201_0
Utah Division of Wildlife Resources (DWLR) , 2OLO, Farmington Bay Waterfowl Management Area
http: //wi-ldli-fe.utah.gov/habitat/farmington_bay.php accessed April 12, 2OLO
UtahFishinlnfo website: http : / /vrvrw.utahf ishinginfo, Accessed April 14, 201-0
B-14
APPENDX C
UTAH DEPARTMENT OF TRANSPORTATION
1997 PRELIMINARY INVESTIGATION
SELECTED DATA TABLES
AND
UTAH DIVISION OF ENVIRONMENTAL RESPONSE AND
REMEDIATION
I99T SITE INVESTIGATION
SELECTED FIGURES AND DATA TABLES
FIGURES
LIST OF FIGURES
Figure 5 Sample Location Map Redwood Road Dump Site
1991 Site Investigation Map
Figure 5a Approximate Sample Location Map
1991 Site Investigation
Redwood Road Dump Site
2008 Satellite Photo Overlav
Figure 5b Soil and Groundwater Arsenic Concentrations
1991 Site Investigation
Redwood Road Dump Site
of the 2008 Satellite Photo Overlav
Figure 6 Groundwater Map Redwood Road Dump Site
srh SOLttH
nD-so44
I
RD.Mw{nr tDral|s
or f,Dsos
E.AST PILE
. RD_SO{s r
r RDSO49
r RDrsOs
I
I
=nrc3tl
cr-l
INrif
I
I
Honitor Well Location
Sample Location
UTAH DEPARTMENT OF HEALTH
BURTAU oF ErwtRoNMElrrAL REspor{sE ero irueouwox
Sample Location Map
Redwood Road Dump Site
Figure 5
6/L1/91 Not to Scale
Utah Departnent of
Environmcntel auaky
Division of Envirornncntal
Figure 5a
Approx. Sample Location Map
Redwood Road Dump Site
2008 Satellite Phot'o Ovulay
Sdtl,.bcdsy, Ut h
Utah Deparhcnt of
Environmcntal audity
Division o f Environmcntal
Figure 5b
Soil and Crroundwater
Arsenic Conc€ntrations
Redwood Road Dump Site
Sdt I*G Cotury, Ublt
I_f
tru^l '
Groundwater Contour (ehaIIow)
Groundqrater and
Suface tfater Flov Directlon
. Honltor Well Location
'
-
' -42r Sewer Line
1222
----._
UTAF{ DEPARTMENT OF HEATTH
BI'REAU OF ENVIRONMENTAI f,ESDONSE AND R"SMEDTATION
Groundwater Map
Redwood Road Dump Site
Figure 6
6/17/91 Not to
(bcsed upon nonitor eett dota ard ponttarrd cdmnt ? t J Sitec potentiometric aaps)
TABLES
Table 1
Table 2
Table 3
Table 4
Table 5
Table 6
LIST OF TABLES
1977 Landflll Borehole Explosive Gas Concentrations
1991 Site Investigation Monitoring Well Groundwater Parameters
1991 Site Investigations Sampling Results
Organic Data Results for Groundwater and Surface Water Samples
1991 Site Investigations Sampling Rbsults
Inorganic Analyses for Groundwater and Surface Water Samples
1991 Site Investigations Sampling Results
Organic Analyses for Soil and Sediment Samples
1991 Site Investigations Sampling Results
Inorganic Analyses for Soil and Sediment Samples
TABLE I
I9?7 LANDFILLBOREHOLE
EKPLOSTW CAs @NCENIRATIO}s
ALL VAUTES ARZ PERCEM EY VOLIJ}IE
PBOBE NO.
G- tA-5-6
G- tA- 10- 1 I
G-2A-5-6
G-24- 10- 1r
G-34-5-6
c- 3A- I0- I I
G-3A- 15- 16
A-4A-5-6
G-4A- 10- I I
c-4A- 14-15
G-5A-5-6
G-sA- l0- I I
G-7A-5-5
G-7A-9- l0
c-rE-4236
G- 18-5-5
G-28-5-5
c-23- l0- I I
G-28 - 15- 16
c- 3s -5 -6
G-33-10- ll
G-38-15-I5
G-40-5-6
G-48- l0- I I
G-48- 15- l6
G-58-1.5 + 6.5
c-58-lO-I1
G-68-5 -6
c-68- 10- I1
G-78-4235
G-78-5-6
G-80-5-5 r/2
G- 1C-5-5
G- lC- r0- I r
G-2C-5-6
c-2c- 10-11
G-3c-5-6
c-3c- 10-ll
G- 3C- 15- 16
c-5q-5-6
G-sC- r0- I I
G-6C-5-6
G-6C- 9- 10
t Loser Exploe lve Lhit
H No Readint Takeo
28 Aprt! '77
N.R.**
N-l_
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N.R.
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18
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3lay'7J
0
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0
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0
0
0
0
2.25
o
0
. 2.25
o
0
0
9
l9
t7
t7
0
0
o'
0
0
0
o
0
o.7
0
0.8
o
1.8
No Probe
0
o -'l
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o.4
5 ltry r77.
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0
0
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0
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20
27
o.
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0
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0
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0
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APPENDIX D
UTAH DIVISION OF ENVIRONMENTAL RESPONSE AND
REMEDIATION TARGETED BROWNFIELDS ASSESSMENT. ANALYTICAL RESULTS REPORT
wESTERN poRiroN oF THE REDwooD RoAD DUMp
AND THE SALT LAKE CITY ROAD MAINTENANCE AND
AUTOMOBILE IMPOUND LOT
SELECTED FIGURES AND DATA TABLES
Figure I
Figure 4
Figure 4a
Figure 5
LIST OF FIGURES
Approximate Sample Location Map
Redwood Road Dump Site
2001 TBA,2008 Photo
Benzo (a) Pyrene Concentrations in Soil
Redwood Road Dump
2001 TBA Map
Lead Concentrations in Soil
Redwood Road Dump
2001 TBA Map
Dissolved Arsenic in Groundwater
Redwood Road Dump TBA
FIGURBS
Figure I
Figure 4
Figure 4a
Figure 5
LIST OF FIGURES
Approximate Sample Location Map
Redwood Road Dump Site
2001 TBA,2008 Photo
Benzo (a) Pyrene Concentrations in Soil
Redwood Road Dump
2001 TBA Map
Lead Concentrations in Soil
Redwood Road Dump
2001 TBA Map
Dissolved Arsenic in Groundwater
Redwood Road Dump TBA
I TBA Soil Sample
I TBATrench
A TBA Surface Water Sample
o TBA Soil/Groundwater
t--r I Landfills
by: Neil B. Taylor
32O 160 0 320 Feetr Utah Department of
Environmental Quality
Division of Environmental
Figure I
Approx. Sample Location Map
Redwood Road Dump
2001TBA, 2008 Photo
Salt Lake County, Utah
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Utah Dspartment
of EnvironmentalQuStY
Division of Environrpntal
Response and RemsdialionLEGEND
At Roads
r Soil Sample Location
5000 - Benzo (a)pyrene concenlration (ug/kg)
r - 9ft - Depth of Soil Sample
NS - Sample not collected from this location
U - Laboratory Quantitation Limit
J - Estirnated Value
Frgure4
Benao {a} Pyrsno Concentratbns in Soil
Redwood Road DumpTBA
By: B. Rees Date: April30,20Ol
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Utah Depailment
of Environmental Quality
Division d Environmental
Response and Rernadbtion
LEGEND
/r/ Roadso Soil Sample Location
28.7 J - Estimated Lead Concentration (mgiltg)
7 -9 ft - Depth of Soil Sampte
NS - Sample not collected
j
Figure 4a
Lead Goncentrations in Soil
Redwood Road Dump TBA
Bv: B. Rees Date: Mar 1,2001
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RRD.6.o
60.6 J RRD.I5tNs
(D
at
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1170 J
.RRD.1O
a
119 J
RRD.8a
21.7 J
RRD.12
a
36.2 J
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NS
RRD-ga
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RRD.11I
178 J
0 200 400 600 800 Feet
.
Site Location
Utrah Departnant
of Envircnmental Quallty
Division of Environmential
Response and Remediation
LEGEND
Roads
r Groundwater Sample Location
| 78 J - Dissolved Arsenic (ug/L)
NS - Sample not collected
Figure 5
Dissolved Arsenic in Groundvvater
Redwood Road Dump TBA
By: B. Rees Date: April 27,2401
TABLES
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