Preliminary Analysis of Immediate Effects of
Gold King Mine Release on Water Quality in the
San Juan River, Utah

Summary

In this report, the Department of Environmental Quality (DEQ) summarizes its analysis of the immediate,
short-term, effects of the Gold King Mine release on Water Quality in the San Juan River, Utah. This
interpretation may change as additional data and information continue to be collected and interpreted.

DEQ scientists believe that the highest levels of contaminants associated with the initial spill event
have passed through the San Juan River in Utah. DEQ makes this statement based on several
considerations:

•	At all monitoring locations, the dissolved concentrations of key dissolved metals have peaked
and subsequently declined to concentrations reflective of historic data and that are below
established environmental screening levels.

•	Total metals concentrations are highly variable and difficult to interpret with respect to this
event.

•	The monsoon storm events that occurred over the last couple of weeks are characteristic, but
complicate interpretation of monitoring results, especially with respect to total metals.

•	It is not currently possible to address all possible future states because the long-term effects of
observed peaks remain unknown.

•	Over the long-term, any metals from the event that arrive in Utah will ultimately be deposited in
Lake Powell. DEQ discusses its consideration of these long-term effects later in this analysis.

Introduction

DEQ scientists have reviewed water quality data collected by agency monitoring staff from August 8 to
August 17, 2015 to evaluate whether patterns in the data can help answer three key questions that have
been posed by the public, media, stakeholders, and communities impacted by and responding to the
Gold King Mine release in Utah:

1.	Have the highest contaminant concentrations of the plume passed through the San Juan River in
Utah?

2.	Has the San Juan River returned to concentrations similar to historic conditions?

3.	Does the San Juan River pose a risk to those who rely on the river for agricultural uses,
recreational uses, and drinking water?

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DEQ's analysis includes examination of data collected by DEQ monitoring staff following the spill at four
sites along the San Juan River (Figure 1), twice daily from Saturday, August 8 to Tuesday, August 11,
2015, and then once daily through Monday, August 17, 2015. DEQ has also reviewed data collected by
the New Mexico Environment Department and the U.S. Environmental Protection Agency (EPA) on the
San Juan River upstream of Utah and also compiled and evaluated historic data collected by DEQ and
the U. S. Geological Survey (USGS) beginning in the late 1970's to place recent results in context with
respect to the range of conditions observed historically. The results of these analyses are summarized in
this document.

Metal concentrations in any river, especially a desert river system, are highly variable. These
concentrations naturally vary through time due to weather events and soil erosion within contributing
watersheds. Naturally-occurring metal concentrations also vary from place-to-place due to:

•	Changes in local lithology (the intrinsic characteristics of the rock and soils);

•	Weather events, especially important because summertime thunderstorms create concentrated
events that may differ greatly over relatively small areas; and

•	Hydrology (the delivery of metals from place-to-place in water).

Variation associated with any of these background conditions would complicate the analysis of a metal
release anywhere; the conditions of the San Juan watershed represent extremes with respect to all of
these sources of variability.

Given these considerations, DEQ scientists initiated analysis of the Gold King Mine release by evaluating
which metals would be expected to occur at detectable concentrations downstream of the spill in the
San Juan River in Utah, recognizing that much of the material from the event would likely be deposited
in the river bottoms of the Animas River and the San Juan River in New Mexico.

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San Juan DWQ Sampling Sites	Mm

Figure I. DEQ monitoring locations on the San Juan River.

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Estimated Plume Arrival in Utah

The interpretation of ongoing monitoring results of metal concentrations required estimates of when
the plume would be expected to reach DEQ monitoring locations along the San Juan River in Utah. DEQ
scientists predicted the date and time of the leading edge of the plume (Table 1) by comparing the
discharge measured at four USGS gages against field measurements of river velocity. The discharge-
velocity relationships allowed DEQ scientists to estimate the most likely time that the plume reached
monitoring stations on the San Juan River.

The leading edge of the plume was first established from field observations of the time when orange-
colored water first reached the San Juan River. The predicted plume was then subsequently tracked
downstream from location to location using time-specific measures of discharge from the closest
upstream gage. Periods of relatively stable discharge were averaged to obtain an expected velocity of a
stream segment, and then readjusted as necessary to account for changes in hydrology associated with
inputs from storms or other upstream diversions. The ultimate goal was to follow the leading edge of
the Gold King Plume from the confluence of the San Juan and Animas rivers downstream to the
monitoring locations established by DEQ and others.

Table 1. Estimated plume arrival times for Utah Monitoring Sites

Location

Sample Location

Earliest Estimated

Latest Estimated





Arrival

Arrival

Near Border

San Juan R @ US 160 Xing

8/9/15 @ 8:30 PM

8/10/15@ 8:30 AM



in CO





~30 miles from

San Juan R @ Town of

8/10/15 @ 9:30 AM

8/10/15 @ 9:30 PM

border

Montezuma





~25 miles from

San Juan R @ Sand Island

8/10/15 @ 7:00 PM

8/11/15 @ 7:00 AM

Montezuma







~30 miles from

San Juan R @ Mexican Hat

8/11/15 @ 5:00 AM

8/11/15 @ 5:00 PM

San Island

US 163 Xing





~75 miles from

Lake Powell, San Juan Delta

8/12/15 @ 5:00 AM

8/12/15 @ 5:00 PM

Mexican Hat







~160 river







miles from the







border







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Estimated Time of Arrival for Gold King Mine Spill

Monticello

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8/5/2015

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Mapmylndia, © OpenStreetMap contributors; and the GIS user cornrrulnity

Figure 2. Map showing estimated arrival time of the leading edge of the plume in Utah.

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Expected Plume Signature in Utah

DEQ scientists identified a subset of metals most strongly associated with the Gold King Mine release by
reviewing recently released EPA data from samples that were collected immediately downstream of the
Gold King Mine over the first days following the incident. The initial analyses focused on dissolved
metals that:

1.	Represented the majority of the metals released in the Gold King Mine release; and

2.	Were particularly high relative to metal concentrations that have been previously documented in
the lower San Juan River.

The list of potential metals to be used to detect the signature of the plume was further refined by
reviewing data from samples collected in response to the Gold King Mine release to determine whether,
and to what extent, any metals concentrations remained elevated relative to background
concentrations as the leading edge of the plume reached the San Juan River. This analysis was not
intended to quantify the overall impacts of the release; rather it was intended to highlight elevated
concentrations that would likely be observable in the lower San Juan River in Utah. That is, DEQ aimed
to compare plume concentrations with pre-plume background concentrations to identify those
contaminants that would provide the best signature.

The above analysis was confined to the dissolved metals fraction that were released, because dissolved
metals present the most immediate threat to resident fish and wildlife in the San Juan River, or to stock
animals that drink water from the river. Total metals were also considered, but these data are more
difficult to interpret in the context of this event because:

•	Total metals are naturally high and variable in the San Juan River system due to local geology
and hydrology;

•	Metals associated with soil particles can enter the river system during storm runoff events,
three of which occurred between August 5 and August 12, 2015, and may overwhelm and mask
the signature of the plume;

•	Total metals are particularly susceptible to laboratory interference; and

•	A significant fraction of total metals likely is traveling along the bed of the river and would not
be reflected uniformly in water column samples.

The preliminary screen of priority pollutants to use as markers for this event revealed two principal
dissolved metals that could be used to trace the plume, if evident, through Utah:

•	Aluminum

•	Iron

An additional three metals were identified as complimentary tracers because they were a significant
component of the mine release, but at much lower concentrations;

•	Manganese

•	Zinc

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• Cobalt

Together, these metals represent ~95% of potentially toxic metals that were released to the Animas and
San Juan Rivers. Some elements were eliminated as priority tracers because they are relatively non-toxic
or are naturally occurring in relatively high concentrations (e.g., calcium, sodium, and magnesium).
Finally, several metals were observed at elevated concentrations, but were eliminated as candidate
tracers (e.g., copper and lead), because they were not observable downstream due to dilution from the
San Juan River or due to other biogeochemical processes that may have retained the metals upstream.

Analysis of Trends in Water Quality Data

DEQ has prepared time-series plots (Figures 4 - 8; Appendix 1) that show the concentrations of water-
quality parameters through time at four separate sampling locations (Figure 1). The data include
samples collected by both DEQ and EPA.

Plots for sites at the New Mexico-Utah state line, Montezuma, and Sand Island are based on data from
DEQ. Plots for the sites at Shiprock and Hoback include only data from EPA. Sites are color coded as
described in the legend in the upper right corner of the plot. In addition, dates of significant rain events
are noted along the bottom of the plot as black triangles. Along the bottom axis, the date labels are
placed at midnight of that day. Samples were also collected at Mexican Hat, but were not included in the
plots because of the strong interference suspected by Chinle Wash, just upstream of Mexican Hat, on
water quality patterns.

Relevant water quality screening criteria for each parameter are also displayed on the plot as black
dashed lines. These criteria include:

•	Standards for domestic-source water

•	Warm water aquatic life

•	Agricultural uses

In addition to the lines displayed on the plots, the numeric values for each standard are presented in the
legend in the upper left corner of the plot. Parameters without established criteria for particular uses
are noted with NA for not applicable.

Where available, the historically observed ranges of parameters in the San Juan River from two data
sources, DEQ and USGS, are displayed as boxplots to the right of the time series data. These ranges
represent observed pre-spill conditions for the San Juan River.

Dissolved Metal Trends Linked to Plume

After identifying the metals from the release that would be most likely to manifest at Utah monitoring
locations, it was important to determine whether these elements were observed in samples collected
from the San Juan River in Utah. Since the Gold King Mine release was first announced, DEQ has been

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collecting samples at several locations in the San Juan River. The EPA, among other entities, has
responded similarly.

There are a couple of predictions that can be made by combining estimates of expected travel time with
monitoring results of key "tracer" constituents of the Gold King Mine release:

•	If the plume was measureable in the San Juan in Utah, DEQ would expect to see peak
concentrations of key constituents, especially dissolved iron and aluminum, at concentrations
higher than has been observed historically in the San Juan River. If coincident peaks in the
concentrations of manganese, zinc, or cobalt are also observed at atypically high concentrations,
this would further corroborate the interpretation that these peaks are the result of the Gold
King Mine release.

•	The peak concentrations of key these key tracer metals should occur at roughly the time
predicted by the travel time predictions and should occur increasingly later as the leading edge
of the plume moves downstream.

These predictions are manifest in data from DEQ and EPA water samples. This is evidenced in both the
time series graphs (Appendix 1) and in the tables that provide specific monitoring results. Both sources
of results show that peak concentrations of key tracers occurred at approximately the time predicted by
travel time estimates. Moreover, the peaks of tracer elements like aluminum and iron occurred first at
samples collected at the Utah-New Mexico border and then progressively later at downstream locations.
The box plots accompanying the time-series plots also reveal that peaks in dissolved aluminum and iron
were greater than concentrations observed from historical routine monitoring in the San Juan River.
Observed peak concentrations of these key metals persisted, depending on the monitoring location,
from about 12-24 hours (although precise estimates the extent of dispersion of the plume are
immediately impossible to determine due to the 12-hour lag between samples).

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Source water std = NA
Warm water aquatic life std = 750
Ag use water std = 5000

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
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Figure 4. Time-series plot of dissolved aluminum in the San Juan River, Utah.

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Ag use water std = NA

NM-UT state line
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Sand Island
Shiprock (EPA)
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Figure 5. Time-series plot of dissolved iron in the San Juan River, Utah,

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Historical data

UDWQ USGS
Historical data


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Source water std = NA
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Ag use water std = tOOO

NM-UT state line
Montezuma
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Figure 6. Time-series plot of dissolved cobalt in the San Juan River, Utah.

Figure 7. Time-series plot of dissolved manganese in the San Juan River, Utah.

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Source water std = NA
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Ag use water std = 25000

NM-UT state line
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Figure 8, Time-series plot of dissolved zinc in the San Juan River, Utah.

12

UDWQ USGS
Historical data


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Total Metal Patterns in the River Difficult to Link to Plume

DEQ was not able to use patterns in total metals concentrations to evaluate the effects of the release on
the San Juan River. Total metals interpretation was complicated by high background concentrations,
storm and natural geology influence, the potential for laboratory interference, and sedimentation and
remobilization processes.

Background total metals concentrations

Total metal concentrations are naturally high in the San Juan River. In most cases, total concentrations
were one to several orders of magnitude greater than dissolved concentrations. Moreover, at several
monitoring locations, the highest total metal concentrations for several key constituents were greatest
in samples that were clearly collected before the spill arrived.

Storm influence

Based on historic water-quality monitoring data, total metal concentrations are highly variable in the
San Juan River, and much of this variation is considered to be natural. High levels of variation complicate
the ability to ascribe any single observation to the Gold King Mine release. This is especially true given
the monsoon rains that occurred episodically after the Gold King Mine release, which are expected to
increase the delivery of total metals to the San Juan River ecosystem.

A review of precipitation and hydrological data from the Colorado Basin Forecast Center demonstrates
the effect monsoon-rain events have on flow in the San Juan River. Two major precipitation events
occurred on August 8, 2015 and August 12, 2015. Figure 9 shows the intensity and areal coverage of
these events and the corresponding response to flow in the San Juan River. The August 12, 2015, storm
event was particularly strong and created a large flash flood event in the Chinle Creek basin, which
intersects the San Juan River between Bluff, UT and Mexican Hat, UT. Storm events of this magnitude
likely deliver large quantities of total metals from a variety of source areas throughout the watershed.
Further investigation is needed to statistically relate these events to observed total metal
concentrations.

Watershed geology

The geology of the San Juan River basin ranges widely in age from contemporary sand dunes and river
deposits to quartzite exposures over 500 million year old. Geologic strata exposed at the surface vary
from highly resistant rocks near the Goosenecks portion of the San Juan River to extremely erodible
marine shales near the Mancos River in New Mexico and Colorado. The combination of both highly
resistant and highly erodible geological strata within the watershed allow for great quantities of water
and sediment to be added to the main river system in response to sporadic but locally intense summer
monsoon storms. These factors contribute to the high sediment load of the San Juan River. In addition,
marine shales commonly have substantial concentrations of trace elements, including toxic metals that
may also be present in mine waste. Evaluation of the longer term impacts of the spill may include an
assessment of the surficial geologic deposits and soils within the watershed to develop a better
understanding of potential naturally occurring nonpoint sources of metals to the San Juan.

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Sediment deposition and remobilization

Flow in the San Juan River is largely influenced by spring snowmelt, summer monsoon rain events, and
reservoir release from Navajo Lake. An example of two summer monsoon events is presented in Figure
9. This figure demonstrates that the San Juan River can receive a significant amount of water from storm
events that occur in isolated sub-basins within the watershed.

Given the geology of the watershed, there is a significant amount of fine-grained sediment available for
transport by the San Juan River and its tributaries. These sediments exist as fine grained sands, silts, and
clay as well as some larger boulder and cobble bed load. Fine-grained bed load is particularly important
in the context of deposition and remobilization of metals delivered to the river in the initial plume.
During large flow events fine-grained sediments become highly mobile and are transported easily
throughout the system. This was observed in recent sampling events with the increase of total
suspended solids from upstream to downstream monitoring stations. When flow levels recede, these
fine-grained sediments are deposited first in backwater areas of the river channel then in the main river
channel as flow recedes further.

It is expected that total metals and the flocculants observed with the mine release will respond similarly
to fine-grained sediments. Metals and flocculants will continue to be deposited , mobilized, and
transported downstream with subsequent high flow events , ultimately being deposited in Lake Powell.
It is expected that eventually these will be capped off and covered up with fine-grained sands and silts
from future precipitation events.

Lab interference

Total metals are particularly susceptible to laboratory interference, especially under circumstances
where ambient conditions with elevated dissolved and suspended solids. Such interferences can alter
laboratory results because, among other things, they often necessitate dilution of samples prior to
analysis. Such dilutions are accounted for, but the variation in the extent of dilution from one collection
event to the next complicates data interpretation. This is especially true for constituents such as metals,
that are measured at very low (parts per billion) concentrations.

Water Quality Data Compared to Screening Values for River
Uses

The most important immediate question related to the Gold King Mine release on Utah's waters is
whether any observed increases in metals concentrations pose a threat to the uses of the San Juan
River. DEQ has addressed this concern by collaborating with Utah's Department of Health and
Department of Agriculture and Food to establish threshold values and appropriate ways for interpreting
these values for those uses that were determined to be at greatest threat from this event. These tables
and associated indicator values have been published daily and will continue on a weekly basis until
monitoring efforts associated with this event have ceased. Appendix 2 includes a detailed summary of
the screening values used in this analysis as well as comparison against water quality data collected from

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August 8, 2015 to August 17, 2015. These ongoing results continue to be evaluated with respect to the
threat that elevated concentrations potentially pose to several important uses of the San Juan River:

•	Drinking Water

•	Recreation

•	Fish and Wildlife

•	Agriculture

Generally, professionals from all state agencies have concluded that, even at peak concentrations, the
observable increase in metals from the Gold King Mine release have posed minimal threat to all of these
uses. Summary statements from other state agencies with respect to threats are summarized in the
following sections. Estimated results-values below the laboratory's reporting limit are not included in
this analysis but will be further evaluated by DEQ. These results generally show low-level concentrations
and are not expected to significantly affect the analysis outcome. DEQ's detailed screening-level analysis
tables and report are presented in Appendix 2. The following sections provide a description and
interpretation of current results.

Aquatic Life

In terms of immediate threat, the most appropriate criteria are those established in Utah Water Quality
Standards for acute (4-day) exposure to metals associated with the Gold King Mine release. A
comparison of monitoring data against these thresholds reveals a violation of acute criteria for dissolved
aluminum, at most locations, for two consecutive monitoring events (~12-18 hours). Dissolved iron also
exceeded acute concentrations, but only for a single sample event at the most upstream location.
Obvious effects from these exceeded values, such as fish kills, have not been reported. More subtle
effects, such as harm to particularly sensitive young life stages offish or any deleterious effects to less
obvious assemblages (e.g., macroinvertebrates) may have occurred, but given the relatively short
duration of metal peaks and the limited number of metals at elevated concentrations, DEQ does not
believe that such responses are likely. Nevertheless, Utah's Division of Wildlife Resources and the U.S.
Fish and Wildlife Service have ongoing monitoring activities aimed at the protection offish species to
help ascertain any more subtle, long-term effects of the Gold King Mine release.

Recreation

The total metals analysis provides results for metals that are both dissolved and present as very small
particles. Total metals analysis is used to evaluate recreational exposures so as to be as protective as
possible of human health.. Agency for Toxic Substance and Disease Registry (ATSDR) health-based
comparison values (CVs) were used when available. In some cases, EPA risk-based Regional Screening
Levels (RSLs) were used in the absence of an established CV. CVs exist for acute (up to two weeks),
intermediate (two weeks to one year) and chronic (more than one year) exposures. Intermediate CVs
were used followed by chronic CVs in the absence of intermediate CVs. Further analysis of this dataset
was provided by UDOH in a series of statements of evaluation for recreational exposures. The latest
evaluation as of the release of this document can be found here: Statement of Evaluation.

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Drinking Water Sources

DEQ's Division of Drinking Water (DDW) compared the measured levels of total metals and dissolved
metals from the San Juan River water samples to the EPA-established drinking water Maximum
Contaminant Levels (MCLs) for metals. For drinking water quality, it is more protective of public health
to use the total metals result to determine how safe water is to drink. Because of this, MCLs are
compared against the total metals analysis when treated waters are assessed for safety.

The sampling results from August 8, 2015, through Augustl5, 2015 so far indicate that:

•	The total metals in the untreated river water samples have exceeded the drinking water MCLs
for aluminum, arsenic, iron, manganese, and the action level of lead.

•	The dissolved metals in the untreated river water samples meet these drinking water MCLs.

Therefore, it is likely that the suspended particles in the river water contributed to the MCL exceedance
of aluminum, arsenic, iron, manganese, and lead.

Drinking water systems that can properly treat surface water and meet the required turbidity standards
established by the EPA can successfully remove the suspended particles during the water treatment
process. As the dissolved metals data meet MCLs, DDW finds that the San Juan River can be a viable
water source if adequate treatment (e.g., filtration, precipitation, etc.) exists to remove the suspended
particles and to meet turbidity standards.

DEQ continues to coordinate with three San Juan County water systems regulated by the State of Utah
(Mexican Hat, Bluff, and Sand Island) in regards to monitoring the public drinking water wells located
near the San Juan River. It is important to note that none of these three water systems draw their
source waters directly from the San Juan River. Mexican Hat's long-term monitoring strategy includes
taking metals samples from its wells this week, and continuing periodic metals sampling as needed
beginning in six months' time.

The compliance sampling data for all public water systems regulated by State of Utah are available from
DDW. To obtain the data from DDW, fill out the request form and fax the form to (801)536-4211.

Public water systems located on tribal lands are being managed by their appropriate authorities, for
example, Navajo Tribal Utility Authority (NTUA).

Residents with a private well can call a certified drinking water lab to get it tested. The laboratories
provide the required bottles, sampling instructions and return instructions.

Dissolved metals are usually considered more mobile and biologically available (can be absorbed by the
body). The screening values used in this table are from Utah's water quality standards protective of
source water for domestic use.

The Water Quality Interpretation Tool developed by Utah State University Extension Services allows
users to enter their water quality data online and receive interpretation of those data pertaining to
drinking water, irrigation water, livestock water, and environmental water state standards. The

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explanation of results from this tool provides information on the analyte health effects, the susceptible
populations, and typical routes of exposure.

Agriculture

The Utah Department of Agriculture and Food (UDAF) lifted all advisories against using San Juan River
water for crop irrigation and livestock watering on August 14, 2015.

Based on the latest DEQ evaluation of the San Juan River water sample data, Utah State University's
veterinary toxicologist reports that the river's highest levels of contamination posed no adverse effects
on plants, soils and animals, only short-term and minimal exposure risks. The UDAF advises farmers and
ranchers to remain cautious and report any changes in the health of their crops and livestock.

Evaluating Long-term Effects of the Spill on Utah's Waters

Over the long-term, DEQ scientists project that most metals from the Gold King Mine release that arrive
in Utah will ultimately be deposited in Lake Powell. Ideally, these metals will be covered by a sufficient
layer of non-toxic sediment to reduce aquatic life exposures to high metal concentrations. The high
sediment load of the San Juan River, the depositional area in the San Juan arm of Lake Powell, and the
long residence-time of water and its constituents in the lake before being transported downstream
(roughly 7.2 years), should help reduce the effects of this event. Many questions regarding the long-
term impacts of this spill remain unanswered. For example, impacts of the contamination on nearby
groundwater drinking water aquifers, aquatic ecosystems, and soils irrigated with river waters are just a
few of the many potential issues that will need to be addressed. These issues will require that DEQ, in
collaboration with other Utah agencies, develop a long-term monitoring plan.

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Appendix 1. Water Quality Trend Graphics


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Source water std = NA
Warm water aquatic life std = 750
— Ag use water std = 5000

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O	v-

O O
2 CM
CM

£= LO
O	v-

O O
2 CM
CO

£=	LO

O	v-

O	O

2	CM

£= LO
O	v-

O O
2 CM
LO

£= LO

O	v-

O O
2 CM
CO

£=	LO

O	v-

O	O

2	CM

O

o

o
o
o

CO

o
o

LO
CM

o
o
o

CM

O
O
LO

O

o
o

o
o

LO

o —

UDWQ USGS
Historical data

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

t—

o

\—

o

\—

o

\—

o

\—

o

\—

O

\—

o

\—

o

\—

O

\—

o

\—

o

o

o

o

o

o

o

o

o

o

o

o

O

o

o

o

o

o

o

o

o

o

o

CM

Z

CM

Z

CM

Z

CM

Z

CM

Z

CM

Z

CM

Z

CM

Z

CM

Z

CM

Z

CM

Z





CO



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CM



CO







LO



CO







CO



CO



CO







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CO



CO



CO



CO



CO



CO



CO



CO



UDWQ USGS
Historical data


-------
o

CNJ

LO

Source water std = 10

Warm water aquatic life std = 340

Ag use water std = 100

LO

o

o

CNI

p:

oo

\ O 		

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

O
O

O
CM
CO
CO

o
o

o
CM
G)
CO

£=	LO

O	v-

o	o

2	CM

£=	LO

O	v-

O	O

2	CM

£=	LO

O	v-

O O
2 CM
CM

£= LO
O	v-

O O
2 CM
CO

£=	LO

O	v-

O	O

2	CM

£= LO
O	v-

O O
2 CM
LO

£= LO

O	v-

O O
2 CM
CO

£=	LO

O	v-

O	O

2	CM

O

o

o

CNJ

LO

LO

o

o
o

UDWQ USGS
Historical data

o

CO

03

H—<

,o

CD

O
CNJ

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

t—

o

\—

o

\—

o

\—

o

\—

o

\—

O

\—

o

\—

o

\—

O

\—

o

\—

o

o

o

o

o

o

o

o

o

o

o

o

O

o

o

o

o

o

o

o

o

o

o

CM

Z

CM

Z

CM

Z

CM

Z

CM

Z

CM

Z

CM

Z

CM

Z

CM

Z

CM

Z

CM

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CO



CO



CO







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CO



CO



CO



CO



CO



CO



CO



CO



o

CO

o

CNJ

UDWQ USGS
Historical data


-------
o
o

Source water std = 1000
Warm water aquatic life std = NA
Ag use water std = NA

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

O)

CO

H—<

,o

03
00

o
o
o

"3"

o
o
o

CO

o
o
o

CM

o
o
o

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

t—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

o

\—

o

O

o

O

O

o

O

o

O

o

o

o

O

o

O

o

O

o

o

o

o

o

o

CN

Z

CN

Z

CN

Z

CN

Z

CN

Z

CN

Z

CN

Z

CN

Z

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Z

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Z

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CO



CO



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CO



CO



CO



CO



CO



CO



CO




-------
~0

%
o
in
w

Q

E

o

CO

o

CM

o

Source water std = 4

Warm water aquatic life std = NA

Ag use water std = NA

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

CD

m

—— o ©

~T"

LO

O
CM

CO

o
CM

CO

o
o

o
cm

CO
CO

o
o

o
cm

G)
CO

£=	LO

O	v-

o	o

2	CM

£=	LO

O	v-

o	o

2	CM

£= LO
O	v-

O O
2 CM
CM

£= LO
O	v-

O O
2 CM
CO

£=	LO

O	v-

O	O

2	CM

£= LO
O	v-

O O
2 CM
LO

£= LO

O	v-

O O
2 CM
CO

O
O

O

o

LO

0)

03

H—<

,o

CD
GO

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

~T~

LO

O
CM

CO

o
o

~T"

LO

o
CM

CO
CO

o
o

~T"

LO

o
CM
G)
CO

o
o

~T"

LO

o
CM
o

CO

o
o

~r

LO

o
CM

o
o

~T"

LO

o
CM
CM

CO

o
o

~r

LO

o

CM
CO

CO

o
o

~T"

LO

o
CM

CO

o
o

~T"

LO

o
CM
LO

CO

o
o

~T"

LO

o
CM
CO

CO

o
o

~T"

LO

o
CM

CO

o
o


-------
O)

CO

-I—»

.O

E
¦o

CO

O

CM -

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

O
CM

CO

o
o

o
cm

CO
CO

o
o

o
cm

G)
CO

£=	LO

O	v-

o	o

2	CM

£=	LO

O	v-

o	o

2	CM

o
o

~T"

LO

O
CM
CM

CO

£= LO

O	v-

O O
2 CM
CO

£=	LO

O	v-

O	O

2	CM

£= LO

O	v-

O O
2 CM
LO

£= LO

O	v-

O O
2 CM
CO

£=	LO

O	v-

O	O

2	CM

O

o

C\J —

O —

UDWQ USGS
Historical data

o

LO

O)

03

H—<

,o

E
o

-C

o

o
o

o
10

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

~T~

LO

O
CM

CO

O
O

~T"

LO

o
CM
CO
CO

O

o

~T"

LO

o
CM
G)
CO

o
o

~T"

LO

o
CM
o

CO

o
o

~r

LO

o
CM

	1	r

£= LO

O	v-

o o

2	CM

	1	r

£=	LO

O	v-

O	O

2	CM

	1	r

£= LO

O	v-

O O

2	CM

O

o

~T"

LO

o
CM
LO

CO

O
O

~T"

LO

o
CM
CO

CO

o
o

~T"

LO

o
CM

CO

o
o

o

LO

o
o

o

LO

UDWQ USGS
Historical data


-------
Source water std = NA
Warm water aquatic life std = NA
Ag use water std = 1000

LO

LO

o

CNI

p:

00

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

O
O

O
CM
CO
CO

o
o

o
CM
G)
CO

£=	LO

O	v-

o	o

2	CM

£=	LO

O	v-

O	O

2	CM

£= LO
O	v-

O O
2 CM
CM

£= LO
O	v-

O O
2 CM
CO

£=	LO

O	v-

O	O

2	CM

£= LO
O	v-

O O
2 CM
LO

£= LO

O	v-

O O
2 CM
CO

£=	LO

O	v-

O	O

2	CM

O

o

LO

LO

o

o
o

UDWQ USGS
Historical data

o

CO

0)

03

H—<

,o

03
-Q
O

O

o

"3-

o

CM

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

~T"

LO

o
CM

CO

o
o

~T"

LO

o
CM

CO
CO

o
o

~T"

LO

o
CM
G)
CO

o
o

~T"

LO

o
CM
o

CO

o
o

~r

LO

o
CM

O

o

~T"

LO

o
CM
CM

CO

O
O

~r

LO

o

CM
CO

CO

o
o

~T"

LO

o
CM

CO

o
o

~T"

LO

o
CM
LO

CO

o
o

~T"

LO

o
CM
CO

CO

o
o

~T"

LO

o
CM

CO

o
o


-------
Source water std = NA
• • ¦ Warm water aquatic life std = 13
— Ag use water std = 200

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

CD -

o

—

CNJ -

O —

~T"

LO

O
CM
CD

CO

O
CM

CO

o
o

o
CM
CO
CO

o
o

o
CM
G)
CO

£=	LO

O	V-

o	o

2	CM

£=	LO

O	v-

o	o

2	CM

£= LO

O	v-

o o
2 CM
CM

£= LO
O	v-

O O
2 CM
CO

£=	LO

O	v-

O	O

2	CM

£= LO
O	v-

O O
2 CM
LO

o
o

£=	LO

O	v-

O	O

2	CM

O

o

o

CNJ

o
o

o

CO

o

CD

o

o

CNJ

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

~T"

LO

o
CM

CO

o
o

~T"

LO

o
CM

CO
CO

o
o

~T"

LO

o
CM
G)
CO

o
o

~T"

LO

o
CM
o

CO

o
o

~r

LO

o
CM

O

o

~T"

LO

o
CM
CM

CO

O
O

~r

LO

o

CM
CO

CO

o
o

~T"

LO

o
CM

CO

o
o

~T"

LO

o
CM
LO

CO

o
o

~T"

LO

o
CM
CO

CO

o
o

~T"

LO

o
CM

CO

o
o


-------
o
o

LO

—I	1—

UDWQ USGS

Historical data

Source water std = NA

Warm water aquatic life std = 1000

Ag use water std = NA

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

CO

H—<

,o

o
o
o
o
o

o
o
o
o

CD

o
o
o
o

CM

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

T

T

UDWQ USGS
Historical data


-------
Source water std = 15
Warm water aquatic life std = 65
— Ag use water std = 100

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

LO

c\i

o

c\i

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

t—

o

\—

o

\—

o

\—

o

\—

O

\—

o

\—

o

\—

O

\—

o

\—

O

\—

o

O

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

C\J

2

C\J

2

C\J

2

CNj

2

CNj

2

CNj

2

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2

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2

CNj

2

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2

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2





CO



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CO



CO



CO







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CO



CO



CO



CO



CO



CO



CO



CO



LO

o

o
o

UDWQ USGS
Historical data

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

T—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

o

\—

O

o

o

o

O

o

O

o

O

o

o

o

O

o

O

o

O

o

O

o

o

o

o

CM

Z

CM

Z

CM

Z

CM

Z

CM

Z

CM

Z

CM

Z

CM

Z

CM

Z

CM

Z

CM

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CO



CO



CO



CO



CO



CO



CO



o

LO
CM

o
o

CM

O
LO

O
O

O
LO

UDWQ USGS
Historical data


-------
o

CO

LO
CM

O
CM

LO

LO —

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

o

CO

LO
CM

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

t—

o

\—

o

\—

o

\—

o

\—

O

\—

o

\—

o

\—

O

\—

o

\—

O

\—

o

O

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

C\J

2

C\J

2

C\J

2

CNj

2

CNj

2

CNj

2

CNj

2

CNj

2

CNj

2

CNj

2

CNj

2





CO



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CO



CO







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CO



CO



CO



CO



CO



CO



CO



CO



o
o

O
LO

O

o
o

"3"

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

o
o
o

LO

o
o
o

o
o
o

CO

o
o
o
CM

o
o
o

o
o
o

CO

o
o
o

CM

o
o
o

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

T—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

o

\—

O

o

o

o

O

o

O

o

O

o

o

o

O

o

O

o

O

o

O

o

o

o

o

CNJ

Z

CN

Z

CN

Z

CN

Z

CN

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CN

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CN

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CN

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CN

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CO



CO







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CO



CO



CO



CO



CO



CO



CO




-------
CD —

O)

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%
o
(/)
(/)

"3" —

— CO —

CD
TD
-Q

O

CNJ —

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

o
CM

CO

o
o

o
cm

CO
CO

o
o

o
cm

G)
CO

£=	LO

O	v-

o	o

2	CM

£=	LO

O	v-

o	o

2	CM

£=	LO

O	v-

O O
2 CM
CM

£= LO
O	v-

O O
2 CM
CO

£=	LO

O	v-

O	O

2	CM

£= LO
O	v-

O O
2 CM
LO

£= LO

O	v-

O O
2 CM
CO

£=	LO

O	v-

O	O

2	CM

O

o

03

H—<

,o

o

CO

LO
CNJ

o

CNJ

LO

CD
"O

§ °
o T~

LO

o

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

~T~

LO

O
CM

CO

o
o

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LO

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CM

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CO

o
o

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CO

o
o

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LO

o
CM
o

CO

o
o

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LO

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CM

O

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CM
CM

CO

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O

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LO

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CM
CO

CO

o
o

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o
CM

CO

o
o

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LO

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CM
LO

CO

o
o

~T"

LO

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CM
CO

CO

o
o

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CM

CO

o
o


-------
~0

%
o
(/)
cn

o

CO

LO

c\i

o

c\i

LO

Source water std = NA

Warm water aquatic life std = 468

Ag use water std = NA

CD

O P

LO

o

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

t—

o

\—

o

\—

o

\—

o

\—

O

\—

o

\—

o

\—

O

\—

O

\—

o

\—

o

O

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

C\J

2

C\J

2

C\J

2

CNj

2

CNj

2

CNj

2

CNj

2

CNj

2

CNj

2

CNj

2

CNj

2





CO



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CO



CO



CO







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CO



CO



CO



CO



CO



CO



CO



o

CO

LO
c\i

UDWQ USGS
Historical data

0)

03

H—<

,o

CD
O

o

"3"

o

CM

O
O

O

CO

O
CD

O
"3"

O
CM



NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

T—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

o

\—

o

o

o

o

O

o

O

o

O

o

o

o

O

o

O

o

O

o

o

o

o

o

o

CM

Z

CM

Z

CM

Z

CM

Z

CM

Z

CM

Z

CM

Z

CM

Z

CNJ

Z

CNJ

Z

CNJ

Z





CO



G)



O



t—



CM



CO







LO



to







CO



CO



CO







\—

































CO



CO



CO



CO



CO



CO



CO



CO



o

O
CM

O
O

O

CO

O
CD

O

O
CM

UDWQ USGS
Historical data


-------
Source water std = 50

Warm water aquatic life std = 18.4

Ag use water std = 50

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

o

c\i

LO

o

o
o

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

t—

o

\—

o

\—

o

\—

o

\—

O

\—

o

\—

o

\—

O

\—

o

\—

O

\—

o

O

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

C\J

2

C\J

2

C\J

2

CNj

2

CNj

2

CNj

2

CNj

2

CNj

2

CNj

2

CNj

2

CNj

2





CO



G)



o



t—



C\J



CO











CD







CO



CO



CO







\—

































CO



CO



CO



CO



CO



CO



CO



CO



UDWQ USGS
Historical data

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

CD —

^ —

CSJ —

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

T—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

o

\—

O

o

o

o

O

o

O

o

O

o

o

o

O

o

O

o

O

o

O

o

o

o

o

CN

Z

CN

Z

CN

Z

CN

Z

CN

Z

CN

Z

CN

Z

CN

Z

CN

Z

CN

Z

CN

Z





CO



G)



O



t—



CN



CO







LO



CO







CO



CO



CO







\—

































CO



CO



CO



CO



CO



CO



CO



CO



UDWQ USGS
Historical data


-------
GO
O

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

GO

o

0)

"O

%

0
(/)
C/)

b

1

0)

CD
o

o

CNJ
o

CD
o

o

CNJ
o

o
o

o
CM

CO

o
o

o
CM
CO
CO

o
o

o
CM
G)
CO

£=	LO

O	v-

o	o

2	CM

£=	LO

O	v-

o	o

2	CM

£=	LO

O	v-

O O
2 CM
CM

£= LO
O	v-

O O
2 CM
CO

£=	LO

O	v-

O	O

2	CM

£= LO
O	v-

O O
2 CM
LO

£= LO

O	v-

O O
2 CM
CO

£=	LO

O	v-

O	O

2	CM

O

o

LO

03

H—<

,o

I
w

LO

o

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

LO

LO

o

o
o

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

t—

o

\—

o

\—

o

\—

o

\—

o

\—

O

\—

o

\—

o

\—

O

\—

o

\—

o

o

o

o

o

o

o

o

o

o

o

o

O

o

o

o

o

o

o

o

o

o

o

CM

Z

CM

Z

CM

Z

CM

Z

CM

Z

CM

Z

CM

Z

CM

Z

CM

Z

CM

Z

CM

Z





CO



G)



o



t—



CM



CO







LO



CO







CO



CO



CO







\—

































CO



CO



CO



CO



CO



CO



CO



CO




-------
CD

H—<

0)

o
o
o
o
o

CM

O

o
o
o

LO

o
o
o
o
o

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

o
o
o
o

LO

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

t—

o

\—

o

\—

o

\—

o

\—

O

\—

o

\—

o

\—

O

\—

o

\—

O

\—

o

O

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

C\J

2

C\J

2

C\J

2

CNj

2

CNj

2

CNj

2

CNj

2

CNj

2

CNj

2

CNj

2

CNj

2





CO



G)



o



t—



C\J



CO







LO



CD







CO



CO



CO







\—

































CO



CO



CO



CO



CO



CO



CO



CO



0)

"O

%
o
(/)
C/)

b

o

C\J

o

LO

o

o
o

LO

o

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

T—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

o

\—

O

o

o

o

O

o

O

o

O

o

o

o

O

o

O

o

O

o

O

o

o

o

o

CN

Z

CN

Z

CN

Z

CN

Z

CN

Z

CN

Z

CN

Z

CN

Z

CN

Z

CN

Z

CN

Z





CO



G)



O



t—



CN



CO







LO



CO







CO



CO



CO







\—

































CO



CO



CO



CO



CO



CO



CO



CO




-------
03

H—<

|2

E

3
TO

LO
O

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

T

LO

O
CM

CO

o
CM

CO

o
o
o
o
o

-<3-

o
o
o
o
o
o

o
o
o
o
o

CD

o
o
o
o
o

CM

o
o

o
CM
CO
CO

o
o

o
CM
G)
CO

£=	LO

O	v-

o	o

2	CM

£=	LO

O	v-

o	o

2	CM

£= LO
O	v-

O O
2 CM
CM

£= LO
O	v-

O O
2 CM
CO

£=	LO

O	v-

O	O

2	CM

£= LO
O	v-

O O
2 CM
LO

£= LO

O	v-

O O
2 CM
CO

O
O

O

o

O)

(/)
p

o
V)
"O

%
o
m
m

CO

-I—'

,o

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

~T~

LO

O
CM

CO

o
o

~T"

LO

o
CM

CO
CO

o
o

~T"

LO

o
CM
G)
CO

o
o

~T"

LO

o
CM
o

CO

o
o

~r

LO

o
CM

o
o

~T"

LO

o
CM
CM

CO

o
o

~r

LO

o

CM
CO

CO

o
o

~T"

LO

o
CM

CO

o
o

~T"

LO

o
CM
LO

CO

o
o

~T"

LO

o
CM
CO

CO

o
o

~T"

LO

o
CM

CO

o
o


-------
o
+

CD
LO

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

o
+

CD —|
O

CD
O

+ 	

CD —
O
L6

o
o

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

t—

o

\—

o

\—

o

\—

o

\—

O

\—

o

\—

o

\—

O

\—

o

\—

O

\—

o

O

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

C\J

2

C\J

2

C\J

2

CNj

2

CNj

2

CNj

2

CNj

2

CNj

2

CNj

2

CNj

2

CNj

2





CO



G)



o



t—



C\J



CO







lB



CD







CO



CO



CO







\—

































CO



CO



CO



CO



CO



CO



CO



CO



Source water std = NA
• ¦ Warm water aquatic life std = NA
— Ag use water std = 100

CO —

CD -

= ^ -

CSJ -

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

T—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

O

o

o

o

O

o

O

o

O

o

o

o

O

o

O

o

O

o

O

o

o

o

o

CN

Z

CN

Z

CN

Z

CN

Z

CN

Z

CN

Z

CN

Z

CN

Z

CN

Z

CN

Z

CN

Z





CO



G)



O



t—



CN



CO







LO



CD







CO



CO



CO







\—

































CO



CO



CO



CO



CO



CO



CO



CO




-------
NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

t—

o

\—

o

\—

o

\—

o

\—

O

\—

o

\—

o

\—

O

\—

o

\—

O

\—

o

O

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

o

C\J

2

C\J

2

C\J

2

CNj

2

CNj

2

CNj

2

CNj

2

CNj

2

CNj

2

CNj

2

CNj

2





CO



G)



o



t—



C\J



CO







55



CD







CO



CO



CO







\—

































CO



CO



CO



CO



CO



CO



CO



CO



Source water std = NA
Warm water aquatic life std = 120
Ag use water std = 25000

NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

LO

£=

T—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

O

\—

o

\—

O

o

o

o

O

o

O

o

O

o

o

o

O

o

O

o

O

o

O

o

o

o

o

CN

Z

CN

Z

CN

Z

CN

Z

CN

Z

CN

Z

CN

Z

CN

Z

CN

Z

CN

Z

CN

Z





CO



G)



O



t—



CN



CO







LO



CO







CO



CO



CO







\—

































CO



CO



CO



CO



CO



CO



CO



CO



o

CO

LO
CM

T

T

UDWQ USGS
Historical data


-------
NM-UT state line
Montezuma
Sand Island
Shiprock (EPA)
Hoback (EPA)
Rain event

o
o

o
o

oo

o
o

CD

o
o

o
o

CM

o —

UDWQ

USGS

Historical data


-------
Appendix 2. Screening Value Analysis


-------
Screening Values used in Evaluation of San Juan River Water Quality Samples

Screening values are taken from Agency for Toxic Substance and Disease Registry (ATSDR) comparison values (CVs) for drinking water when available. When
ATSDR values were not available, EPA Regional Screening Levels (RSLs) for residential tap water were used. Total metal data was used for assessment of
human-health based effects. Agricultural Screening Values are derived from National Academy of Science (NAS) Water Quality Criteria, 1972 (the Blue Book).
Those guidelines are reprinted in EPA's Guidelines for the Reuse of Waters for Irrigation. Dissolved metal values were used for the assessment of agricultural use
waters. Contaminants that do not exceed screening values are not considered to pose a risk of adverse health effects. Estimated results values below the
laboratory's reporting limit are evaluated in this analysis. These results generally show low level concentrations and do not significantly affect the analysis
outcome.

Anatyte CAS # Units





Irrigation Waters (ng/L) [NASt 1972)

Utah WQ Standards for San Juan River
[Dissolved metals]

Drinking Water CY (ppb)



Health-Based
Comparison
Value for Water
Ingestion (CV)
[Total Metals]

CV Type and Source

Livestock Water (ug L)

Long-Term

Short-Term

1C

(Domestic)

3B
(warm
water
fish)
(1-hour)

3B
(warm
water
fish)
[4-day]

4

(agriculture)



Hardness

.

mgL





180 mgL (UA)













Hardness

Aluminum

7429-90-5

MgL

10.000

Child Intermediate EMEG

5,000 (NAS)

5,000

20,000



750

87



Alummum

Antimony

7440-36-0

MgL

4

Child RMEG

No Data Available

No Data Available

No Data Available









Aniimonv

Arsenic

7440-38-2

MgL

3

Child RMEG & Chronic EMEG

200 (NAS)

100

2,000

10

340

150

100

Arsenic

Barium

7440-39-3

MgL

2,000

Child Intermediate EMEG

No Data Available

No Data Available

No Data Available

1000







Barium

Bervflrum

7440-41-7

HgL

20

Child RMEG & Chronic EMEG

No Data Available

No Data Available

No Data Available

<4







Beryllium

Cadmium

7440-43-9

W'L

5

Child Intermediate EMEG

50 (NAS)

10

50

10

2

0.25

10

Cadmium

Calcium

7440-70-2

MgL



No CVs available

500,000 (UA)

No Data Available

No Data Available









Calcium

Chromium

7440-47-3

MgL

60

Child RSL, non-cancer, Cr(VI)

1,000 (NAS)

100

1,000

50

16 (VI);

11 (VI);

100

Chromium

Cobalt

7440-48-4

M*L

100

Child Intermediate EMEG

1,000 (NAS)

50

5,000









Cobalt

Copper

7440-50-8

MgL

100

Child Intermediate EMEG

500 (NAS)

200

5,000



13

9

200

Copper

Iron

7439-89-6

MgL

14.000

Child RSL. non-cancer

Limit Not Considered
Necessary- (NAS)

5,000

20,000



1000

1000



Iron

Lead

7439-92-1

MgL

15

Child non-carcinoeenic RSL

100 (NAS)

5,000

10,000

15

65

2.5

100

Lead

Maenesium

7439-95-4

MgL

-

No CVs available

250,000 (UA)

No Data Available

No Data Available









Magnesium

Manganese

7439-96-5

m*l

500

Child RMEG

Limit Not Considered
Necessary (NAS)

200

10,000









Manganese

Mohebdenum

7439-98-7

MgL

50

Child RMEG

No Data Available

10

50









Mohebdenum

Nickel

7440-02-0

MgL

200

Child RMEG

No Data Available

200

2.000



468

52



Nickel

Potassium

7440-22-4

MgL



No CVs available

No Data Available

No Data Available

No Data Available









Potassium

Selenium

7782-49-2

MgL

$0

Child RMEG

50 (NAS)

20

20

50

18.4

4.6

50

Selenium

Silver

7440-22-4

MgL

50

Child RMEG

No Data Available

No Data Available

No Data Available

50

1.6





Silver

Sodium

7440-23-5

MgL

-

No CVj available

1,000,000 (UA)

No Data Available

No Data Available









Sodium

ThaHrum

7440-28-0

MgL

0.2

Child non-carcinogenic RSL

No Data Available

No Data Av ailable

No Data Av ailable









Thallium

Vanadium

7440-62-2

MgL

100

Child Intermediate EMEG

100 (NAS)

100

1,000









Vanadium

Zinc

7440-66-6

MgL

3.000

Child Intermediate EMEG

25.000 (NAS)

2.000

10.000



120

120



Zinc

Mercury

7439-97-6

MgL

0.63

Child non-carcinogenic RSL.
elemental Hg. MgL

10 (NAS)

No Data Available

No Data Available

2



0.012



Mercury

TDS



mg/L





1200 (Utah)

500,000-1,000,000 (NAS)











PH









6.5-9 (Utah)

4.5-9 (NAS)











RMEG: ATSDR Reference Dose Media Evaluation Guide
EMEG: ATSDR Environmental Media Evaluation Guide
RSL: EPA Regional Screening Level


-------
Comparison of San Juan River Raw Water Data with Finished Drinking Water Screening Values - Total Metals



No Exceedence

|Above Screening Level



Prior to Plume Arrival



Estimated Plume Arrival



Post Plume Arrival



Aluminum

Antimony

Arsenic

Barium

Beryllium

Cadmium

Calcium

Chromium

Cobalt

Copper

Iron

Lead

Magnesium

Manganese

Mercury

Molyebdenum

Nickel

Potassium

Selenium

Silver

Sodium

Thallium

Vanadium

Zinc

Health Based Comparison Values for Water Ingestion

10,000

4

3

2,000

20

5

(blank)

60

100

14,000

15

(blank)

500

0.63

50

200

(blank)

50

(blank)

0.2

100

3,000

Monitoring
Location

Site Description

Collection
Date

Collection
Time

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

mg/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L





8/8/2015

1:23 PM

47,400

0.27

12.5

1300

3.42

1.27

336

23.9

22.8

41.4

24,800

44.5

56.3

2,320

0.077

0.76

40.5

12.2

1.09

0.27

38.6

0.41

61.2

147





8/9/2015

12:02 PM

33,900

0.499

12.3

702

2.62

0.907

108

17.4

16.8

59.3

29,400

151

20.3

1,100

0.07

1.37

23

9.04

1.07

1.09

29.8

0.38

50.5

160





8/9/2015

3:05 PM

26,700

0.573

13.5

606

2.08

0.734

92.8

14.2

13.5

63

28,600

185

17.2

942

0.063

1.58

18.2

7.53

0.97

1.34

27

0.3

41.6

172





8/9/2015

6:00 PM

24,600

0.502

10

532

1.8

0.68

86.2

13.7

12.4

47.6

24,100

111

15.8

870

0.045

1.33

16.8

7.04

0.73

0.79

26.1

0.25

37.8

138





8/9/2015

9:02 PM

31,000

0.416

9.59

554

2.25

0.632

78.8

15.5

14.7

49.7

26,500

83.5

15.3

887

0.048

1.01

18.4

7.18

0.7

0.57

29.5

0.31

41.5

137





8/10/2015

9:11 AM

39,900

0.163

11

1730

3.97

1.15

90.8

21

24.8

69.6

35,400

73.5

20.2

1,450

0.115

0.53

29.7

8.24

0.94

0.49

36.6

0.39

48.2

668





8/10/2015

2:06 PM

43,700

0.19

12.3

889

4.04

0.884

86.7

23.7

25.4

69.7

39,100

69.3

20.1

1,390

0.117

0.62

30.8

8.89

0.96

0.42

38.5

0.42

53.4

897

4954000

San Juan R @ US160 Xing in CO

8/11/2015

8:50 AM

77,000

0.216

19.9

1230

6.66

1.2

109

29.5

37

104

54,800

82.2

24.9

1,930

0.187

0.56

39.4

11.8

1.35

0.57

42.9

0.87

69.4

223





8/11/2015

1:17 PM

56,900

0.181

14.2

971

4.97

0.916

95

21.8

27.3

76.7

40,300

62.6

20

1,440

0.13

0.61

29.6

9.65

1.08

0.42

37.4

0.68

51.8

159





8/12/2015

9:50 AM

31,100

0.23

11.1

766

3.16

0.905

164

16.1

18.6

43.7

22,600

47.4

24.7

1,250

0.098

0.77

28.9

7.9

1.04

0.31

32.7

0.46

43.7

131





8/12/2015

2:04 PM

28,500

0.252

9.21

683

2.52

0.641

146

13.2

14.5

34.3

18,100

35.8

24.5

1,130

0.058

0.48

22

7.37

0.75

0.21

28.7

0.28

41.4

96.2





8/13/2015

10:01 AM

38,700

0.156

12

1110

5.62

0.941

124

14.9

28.9

79.3

31,100

66.5

22.5

1,670

0.153

0.53

28.9

8.54

1.2

0.4

45

0.58

51

177





8/14/2015

2:33 PM

44,300

0.413

12.5

918

4.89

0.984

114

23.7

27.1

70.5

39,100

64.3

22.4

1,360

0.148

0.77

34.5

10.4

1.32

0.38

54.8

0.71

60

197





8/15/2015

12:04 PM

14,200

0.279

4.7

262

1.08

0.366

68.1

8.75

6.18

18.2

12,300

17.4

12.7

368

0.03

1.13

8.78

5.16

0.63

0.14

27.7

0.19

25.7

58.9





8/16/2015

9:15 AM

9,500

0.837

4.89

358

0.94

0.302

78

6.21

5.69

14.9

10,000

15.8

13.3

338

0.028

1.23

10.3

5.78

0.86

0.35

31.2

0.23

16.1

215





8/8/2015

2:54 PM

67,300

0.395

20.2

1590

6.36

2.49

390

38.8

41.1

82.4

50,400

91.5

59.1

3,010

0.222

1.3

75.8

17.7

1.93

0.66

51.7

1.18

82.8

286





8/10/2015

10:13 AM

32,300

0.216

11.5

1960

2.72

0.707

93.7

17.3

18.3

56.4

29,700

79.3

20.1

1,130

0.072

0.83

23.5

7.45

0.9

0.52

34.6

0.28

43.8

821





8/10/2015

2:58 PM

39,100

0.228

11.8

1700

3.71

0.881

97.1

22.1

23.2

67.3

35,800

75.8

22.5

1,400

0.098

0.93

29.6

8.49

1.08

0.75

34.9

0.44

49

658





8/11/2015

9:44 AM

52,800

0.295

12.6

918

4.27

0.998

99.7

23.1

25.1

67.9

40,200

62.9

22.5

1,410

0.122

0.75

29.3

9.63

1.2

0.6

36.9

0.67

55.2

166





8/11/2015

2:20 PM

54,700

0.232

15

1060

5.16

1.04

102

24.2

29.1

80.3

44,700

70.2

24

1,570

0.137

0.65

32.4

9.47

1.23

0.45

38.6

0.73

58.4

183

4953990

San Juan R @ Town of Montezuma

8/12/2015

10:37 AM

31,500

0.247

10.2

720

3.62

0.855

108

14.7

19.5

51.7

24,400

49.1

18.4

1,190

0.078

0.45

22.7

7.04

1.06

0.48

33

0.46

38.6

131

8/12/2015

2:57 PM

35,000

0.272

10.7

725

3.97

0.916

130

17

19.5

51.4

26,500

54.1

20.5

1,120

0.112

0.4

27.7

8.29

1.12

0.31

34.5

0.56

40.8

144





8/13/2015

4:46 PM

23,700

0.156

10.1

722

3.57

0.708

127

9.33

17.3

47.9

17,800

44.3

20.8

1,270

0.103

0.68

19.3

6.73

0.95

0.31

34.2

0.32

34.2

109





8/14/2015

9:55 AM

62,000

0.443

16

1400

7.03

1.41

153

29.9

39.8

106

54,300

90.8

32.9

2,060

0.247

0.72

48.4

12.7

1.49

0.5

59.5

1.04

76.4

265





8/15/2015

11:31 AM

29,200

0.329

8.5

566

2.65

0.806

90.2

15.5

15

39.3

24,900

36.5

19.7

862

0.075

1.06

18.7

7.88

0.93

0.25

39.4

0.4

43.3

114





8/16/2015

10:02 AM

13,600

0.232

5.56

517

1.15

0.305

78.8

7.56

7.12

21.1

13,200

19.5

14.6

435

0.033

1.04

10.1

7.25

0.85

0.16

39.3

0.22

21.6

238





8/17/2015

4:07 PM

4,160

0.35

2.63

141

0.41

0.254

65.6

2.42

1.87

6.89

3,510

6.05

13.5

150

0.012

1.5

3.06

3.63

0.66

0.11

31

0.14

8.04

20.2





8/8/2015

4:19 PM

55,700

0.436

15.9

1090

5.21

1.99

252

32.4

34.3

80.8

47,800

74.7

33.8

1,700

0.158

1.75

65.8

13.3

2.14

0.63

58.8

1.29

64.7

242





8/10/2015

11:15 AM

27,000

0.3

13.2

1530

2.3

0.788

104

15.9

15.6

60

28,500

140

21.2

1,090

0.065

1.35

22.1

7.83

1

1.22

30.9

0.26

44.3

664





8/10/2015

3:58 PM

28,700

0.293

10.7

726

2.61

0.713

99.9

16.1

17.3

54.7

27,700

84.7

20.4

1,170

0.073

0.88

22.3

7.29

0.89

0.53

33.2

0.25

40.9

960





8/11/2015

10:53 AM

47,800

0.218

11.5

913

3.87

1.01

98.9

21.7

22.6

61.6

37,000

63.5

22.2

1,310

0.113

0.71

27.7

9.34

0.88

0.44

36.4

0.58

52.7

167





8/11/2015

3:01 PM

48,700

0.272

12

900

4.23

1.04

102

21

23.6

64.2

36,800

63.4

22.4

1,400

0.115

0.86

28

9.46

1.1

0.44

38.2

0.62

51.5

163

4953250

San Juan R @ Sand Island

8/12/2015

11:12 AM

45,400

0.202

14.9

971

5.16

0.94

109

20

27.9

76.7

34,600

67.4

21.9

1,670

0.128

0.34

30.3

8.43

1.1

0.38

38.4

0.57

51.4

176

8/12/2015

5:06 PM

30,600

0.259

10.3

718

3.61

0.712

90.9

13.6

19.2

53.4

23,700

49.1

17.3

1,190

0.08

0.52

21.7

6.84

0.92

0.49

33.2

0.41

38

126





8/13/2015

11:28 AM

19,300

0.215

8.77

661

2.52

0.744

168

8.79

13.6

33.6

12,900

35.6

22.8

1,190

0.06

0.86

18.8

6.83

1.11

0.45

31.6

0.29

32.9

92.7





8/14/2015

11:02 AM

66,300

0.545

16.8

1460

7.48

1.4

148

29.8

41.8

116

58,200

96

35.6

2,160

0.27

0.62

49.2

12.5

1.56

0.57

55.7

1.1

77.4

288





8/15/2015

10:30 AM

37,600

0.394

11.2

826

4.1

0.984

108

20.7

22.2

57.6

32,300

54

23.1

1,230

0.163

1.09

27.8

9.22

1.36

0.51

51

0.63

53.5

160





8/16/2015

11:06 AM

24,600

0.279

7.87

1360

2.25

0.528

86.1

13.6

12.1

33.8

23,300

31.6

18.8

642

0.063

1.1

18

7.32

1.11

0.55

39.4

0.45

32.5

632





8/17/2015

3:33 PM

10,200

0.454

5.03

300

0.97

0.286

85

6.25

5.91

17

10,200

17.2

16.7

414

0.03

1.26

10.2

5.05

0.87

0.17

31.8

0.19

17

55.5

These data are provisional and subject to change and are undergoing DWO's quality assurance and quality control procedures. Data are released in
the interest ofproviding timely data to the public. Neither DWO nor the State of Utah may be held liable for any damages resulting fi'om its use.


-------


No Exceedence

|Above Screening Level



Prior to Plume Arrival



Estimated Plume Arrival



Post Plume Arrival



Aluminum

Antimony

Arsenic

Barium

Beryllium

Cadmium

Calcium

Chromium

Cobalt

Copper

Iron

Lead

Magnesium

Manganese

Mercury

Molyebdenum

Nickel

Potassium

Selenium

Silver

Sodium

Thallium

Vanadium

Zinc

Health Based Comparison Values for Water Ingestion

10,000

4

3

2,000

20

5

(blank)

60

100

14,000

15

(blank)

500

0.63

50

200

(blank)

50

(blank)

0.2

100

3,000

Monitoring
Location

Site Description

Collection
Date

Collection
Time

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

mg/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L





5:40 PM

5:40 PM

63,400

1.31

16.3

1,540

7.23

1.5

167

29.4

41.5

103

51,900

86.7

30.6

2,800

0.18

1.3

47.8

14.4

1.43

0.56

63.9

0.84

70.5

261





11:53 AM

11:53 AM

90,800

0.171

20.6

2,300

7.61

1.53

314

43.1

40.2

72.8

43,400

82.1

57

3,230

0.142

0.65

70.9

19.7

1.37

0.4

46.1

0.62

80

843





4:44 PM

4:44 PM

80,600

0.316

22.7

1,910

6.12

1.27

254

36.8

32.8

69.8

38,100

171

49.4

2,430

0.133

0.67

58.4

18.1

1.28

1.1

52.6

0.44

83.3

815





11:31 AM

11:31 AM

111,000

0.193

22.2

2,430

8.13

1.39

259

43.5

38.5

74.3

47,300

102

57.4

2,710

0.175

0.58

64.6

22.2

1.25

0.59

57.8

0.83

88.4

209





3:43 PM

3:43 PM

56,400

0.345

13.3

1,350

5.09

1.09

150

23.5

25.3

61

35,900

75.1

30.1

1,660

0.13

0.77

34.2

11.7

0.93

0.48

41.6

0.59

57.2

168

4953000

San Juan R @ Mexican Hat US 163 Xing

12:09 PM

12:09 PM

54,700

0.775

17.5

1,350

6.77

1.17

186

23.2

33.2

80.8

37,500

82.9

33.3

2,170

0.143

0.31

38.9

10.7

1.22

0.49

44.4

0.6

63.7

190

5:50 PM

5:50 PM

71,400

0.224

22.7

2,010

8.74

1.55

282

28.5

40.1

82.4

38,600

101

47.9

3,070

0.18

0.23

51.7

14

1.53

0.54

55.6

0.63

78.5

210





12:05 PM

12:05 PM

44,700

1.9

16.5

1,450

5.44

1.25

246

18.3

25

49.5

21,600

62.5

41.9

1,840

0.127

0.68

39.2

12.5

1.59

0.52

48.8

0.43

66.1

145





11:43 AM

11:43 AM

124,000

1.14

37.2

4,320

15.2

3.74

720

51.1

59.6

84.2

46,900

166

105

5,630

0.372

0.92

111

30.4

2.41

1.11

78.6

0.99

115

270





9:43 AM

9:43 AM

63,700

1.16

16.8

1,620

7.29

1.46

207

29.8

35.5

79

45,100

86.7

40.7

2,330

0.198

0.96

47.8

14

1.57

0.63

59.6

0.86

75.5

220





11:58 AM

11:58 AM

34,300

0.18

9.96

892

2.87

0.6

111

17.1

16.3

40.2

25,600

39.4

22.6

976

0.077

0.79

24

10.6

0.97

0.19

47.6

0.42

40.5

294





3:04 PM

3:04 PM

16,800

0.698

6.85

496

2.07

0.429

92.3

8.24

9.82

24.3

13,500

27.1

18

641

0.063

1.06

14.1

6.41

0.98

0.33

38.4

0.26

26.2

72.6





2:42 PM

2:42 PM

42,900

0.144

18.4

1,760

7.39

1.47

355

15.6

32.3

68.8

23,000

83.4

49.7

2,960

0.185

0.56

35.7

11.5

1.39

0.49

52

0.41

64.3

162





2:33 PM

2:33 PM

73,900

0.377

21.7

2,040

7.21

2.22

422

33.8

35.1

59.7

34,700

89.2

63.4

2,900

0.168

1.03

62.9

17.3

1.82

0.66

59.7

0.67

84.5

198

4952940

San Juan R @ Clay Hills

2:30 PM

2:30 PM

154,000

0.281

36.6

4,170

16.6

2.88

960

55.3

63.1

93.2

54,000

175

110

5,740

0.33

0.73

110

33

2.38

0.92

82.9

1.01

116

294





2:46 PM

2:46 PM

91,000

0.175

22

2,250

8.19

1.52

253

40.5

45.4

104

64,500

105

53.5

2,850

0.228

0.62

65.8

19.5

1.88

0.48

63.3

1.12

89.8

477





1:03 PM

1:03 PM

26,200

0.544

9.76

920

3.44

0.737

132

11.3

16.2

39.4

18,300

43.8

24.3

1,240

0.098

1.04

20.8

8.96

1.11

0.54

48.6

0.41

40.7

105

These data are provisional and subject to change
the interest of providing timely data to the public.

and are undergoing DWO's quality assurance and quality control procedures. Data are released in
Neither DWO nor the State of Utah may be held liable for any damages resulting fi'om its use.


-------
Comparison of San Juan River Raw Water Data with Screening Values for Domestic Source Water - Dissolved Metals



No Exceedence

lAbove Screening

Level



Prior to Plume Arrival



Estimated Plume Arrival



Post Plume Arrival



Aluminum

Antimony

Arsenic

Barium

Beryllium

Cadmium

Calcium

Chromium

Cobalt

Copper

Iron

Lead

Magnesium

Manganese

Mercury

Molyebdenum

Nickel

Potassium

Selenium

Silver

Sodium

Thallium

Vanadium

Zinc

Utah Domestic Source Criteria

(blank)

10

1,000

4

10

(blank)

50

(blank)

15

(blank)

2

(blank)

50

(blank)

Monitoring
Location

Site Description

Collection
Date

Collection Time

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

mg/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L





8/8/2015

1:23 PM

217

0.52

1.34

222

0.04

ND

51.5

ND

0.13

2.24

95.8

ND

7.85

2.94

ND

1.87

ND

2.96

0.72

ND

32.2

ND

4.86

15.3





8/9/2015

12:02 PM

258

0.34

0.63

274

ND

ND

50.6

ND

0.08

2.48

119

ND

6.86

2.69

ND

2.01

ND

2.61

0.56

0.03

28.5

ND

1.76

18.5





8/9/2015

9:02 PM

329

0.35

0.95

341

0.04

ND

46

ND

0,14

3.47

198

0.27

6.3

4.14

ND

1.94

ND

2.38

0.54

ND

30

ND

2.07

15.4





8/10/2015

9:11 AM

172

0.46

0.99

233

ND

ND

44.6

ND

0.07

3.21

103

0.39

6.01

1.64

ND

2.03

ND

2.51

0.58

ND

34.1

ND

1.74

19.7





8/10/2015

2:06 PM

1050

0.71

1.3

220

0.09

ND

44.2

ND

0.41

3.35

732

1.04

6.02

12.8

ND

1.92

0.84

2.72

0,65

0.06

35.1

ND

3.64

18



San JuanR @ US160
Xing in CO

8/11/2015

8:50 AM

3290

0.36

1.72

451

0.1

ND

39.8

ND

0.49

4.85

1520

1.1

5.05

19

0.02

1.65

1.19

3

0.97

ND

43.7

ND

3.9

19.1

4954000

8/11/2015

1:17 PM

720

0.05

1.33

334

ND

ND

41.7

ND

0.16

3.03

366

0.27

5.11

5.1

ND

1.58

ND

2.91

0.76

ND

37

ND

2.46

14.9



8/12/2015

9:50 AM

104

0.59

0.88

178

ND

ND

52.1

ND

0.06

2.39

ND

ND

7.2

ND

ND

1.47

ND

2.79

0.78

0.03

30.3

ND

1.9

14.8





8/12/2015

2:04 PM

155

0.55

1.21

151

ND

ND

47.9

ND

0.05

2.61

ND

ND

6.97

1.82

ND

1.48

ND

2.74

0.73

ND

27.3

ND

2.87

16.5





8/13/2015

10:01 AM

257

0.16

1.25

213

0.03

ND

48.3

ND

0.12

3.67

148

0.37

6.48

3.16

ND

1.89

ND

2.87

0.86

ND

42.5

ND

2.1

21.9





8/14/2015

2:33 PM

64.8

0.42

1.7

72.3

0.04

ND

53.4

ND

0.13

3.86

ND

ND

6.61

1.8

ND

3.65

3.14

3.66

1.1

ND

52.4

0.04

4.11

ND





8/15/2015

12:04 PM

47.5

0.45

1.36

65.2

ND

ND

52.8

ND

0.05

1.35

ND

ND

7.91

ND

ND

2.25

ND

2.61

0.61

ND

25.9

ND

2.61

ND





8/16/2015

9:15 AM

54.4

1.12

0.88

179

0.04

ND

53.9

ND

ND

2.91

ND

ND

8.18

ND

ND

1.72

ND

2.54

0.6

0.19

26.1

ND

1.92

12.6





8/8/2015

2:54 PM

136

0.75

1.06

223

0.04

ND

71.5

ND

0.13

2.72

ND

ND

9.92

ND

ND

2.62

0.8

3.84

1.11

0.04

43.5

ND

2.54

21





8/10/2015

10:13 AM

218

0.66

0.94

262

ND

ND

49.8

ND

0.08

3.24

144

0.46

7.7

3.22

ND

2.03

ND

2.69

0.57

0.05

32.1

ND

2.13

17.3





8/10/2015

2:58 PM

94.5

1.31

0.93

200

0.03

ND

48.6

ND

0.06

2.48

ND

0.3

7.35

ND

ND

2.32

ND

2.59

0.61

0.25

31.8

ND

1.96

14.6





8/11/2015

9:44 AM

462

0.57

1.17

314

ND

ND

44.6

ND

0.13

2.66

227

ND

6.49

3.31

ND

1.72

ND

2.64

0,68

0.03

37.1

ND

2.21

12.9





8/11/2015

2:20 PM

1400

0.14

1.25

298

0.04

ND

44.8

ND

0.24

3.47

668

0.49

6.57

9.99

ND

1.72

0.95

2.96

0.74

ND

38.3

ND

2.73

14.3

4953990

San Juan R @ Town of

8/12/2015

10:37 AM

67.5

0.8

1.1

202

0.03

ND

48.3

ND

ND

2.49

ND

ND

7.23

ND

ND

1.66

ND

2.67

0.8

0.04

31.9

ND

1.68

13.5

Montezuma

8/12/2015

2:57 PM

375

0.82

0.91

176

ND

ND

48.9

ND

0.09

4.34

296

ND

7.5

2.28

ND

1.64

ND

2.84

0.72

0.03

33.8

ND

1.99

15.9





8/13/2015

4:46 PM

330

1.88

1.28

240

0.07

ND

49.4

ND

0.18

3.75

192

ND

8.08

5.3

ND

1.91

0.98

2.62

0,98

0.24

32.9

0.03

3.12

32.7





8/14/2015

9:55 AM

24.8

0.58

1.27

85.1

0.04

ND

55.1

ND

0.15

3.79

ND

ND

7.81

ND

ND

2.84

1.76

3.51

0.99

0.04

53

0.03

3.07

ND





8/15/2015

11:31 AM

68.1

0.64

1.58

73.6

0.04

ND

55

ND

0.24

4.38

ND

ND

8.57

3.36

ND

2.43

1.09

3.16

0.89

0.07

35.8

ND

3.54

ND





8/16/2015

10:02 AM

61.8

0.84

1.17

145

0.06

ND

57.5

ND

0.09

3.01

ND

ND

9.36

ND

ND

1.99

ND

2.96

0.67

0.28

30.3

0.05

2.16

9.78





8/17/2015

4:07 PM

27.3

0.29

1.17

80.4

ND

ND

60.2

ND

0.14

1.87

ND

ND

11.6

2.4

ND

1.97

ND

2.82

0.63

ND

29.4

ND

2.18

ND





8/8/2015

4:19 PM

214

1.38

1.03

294

0.06

ND

73.7

ND

0.12

3.86

104

ND

9.24

2.55

ND

3.3

1.01

4.11

1.43

0.12

51.2

ND

2.22

19





8/10/2015

11:15 AM

124

1.24

0.88

192

ND

ND

53.2

ND

0.07

2.07

ND

0.29

8.4

ND

ND

2.38

ND

2.86

0.69

0.25

28.4

ND

1,75

13.7





8/10/2015

3:58 PM

108

0.57

1.07

184

ND

ND

48.4

ND

0.06

1.96

ND

0.32

7.83

ND

ND

2.26

ND

2.67

0.53

ND

30.6

ND

1.89

13.2





8/11/2015

10:53 AM

684

1.18

1.23

278

0.06

ND

45.8

ND

0.17

2.87

328

ND

6.93

4.12

ND

1.92

0.78

2.72

0,69

0.27

36.8

0.03

2.55

13.7





8/11/2015

3:01 PM

158

0.27

1.01

251

ND

ND

45.3

ND

0.09

2.69

89.2

ND

6.65

ND

ND

1.85

ND

2.76

0.67

ND

36.6

ND

2.05

14.9

4953250

San Juan R @ Sand Island

8/12/2015

11:12 AM

623

1.08

1.41

205

0.05

ND

46.8

ND

0.15

3.44

310

ND

6.98

4.47

ND

1.93

ND

2.91

0.79

0.06

37.8

ND

2.61

14.5

8/12/2015

5:06 PM

605

1.78

1.43

260

0.06

ND

46.6

ND

0.16

2.98

314

ND

7.07

5.16

ND

1.81

0.91

2.79

0.78

0.15

33.5

ND

2.32

13.2





8/13/2015

11:28 AM

509

0.67

1.3

156

0.03

ND

53.6

ND

0.21

3.1

275

ND

8.21

8.9

ND

1.62

ND

2.96

0,68

ND

29.2

ND

3.65

20.4





8/14/2015

11:02 AM

ND

1.03

2.03

78.6

0.05

ND

53.2

ND

0.13

3.31

ND

ND

8.26

7.02

ND

5.31

2.38

3.27

1.08

0.19

49.5

0.13

5.88

4.87





8/15/2015

10:30 AM

95.2

1.12

1.84

83,5

0.04

ND

55.7

ND

0.09

2.27

ND

ND

8.4

ND

ND

3.93

0.82

3.46

1.06

0.28

46.7

0.05

3.45

ND





8/16/2015

11:06 AM

290

0.43

1.23

149

0.04

ND

55.8

ND

0.15

3.89

202

ND

10.2

3.94

ND

1.95

ND

2.91

0.71

0.04

36.3

ND

2.04

10.5





8/17/2015

3:33 PM

ND

0.41

1.48

87.1

ND

ND

62.4

ND

0.17

2.11

ND

ND

11.2

ND

ND

2.67

1.28

3.13

0.63

ND

30

ND

2.75

ND

These data are provisional and subject to change and are undergoing DWO's quality assurance and quality control procedures. Data are released in
the interest ofproviding timely data to the public. Neither DWO nor the State of Utah may be held liable for any damages resulting from its use.


-------


No Exceedence

lAbove Screening

Level



Prior to Plume Arrival



Estimated Plume Arrival



Post Plume Arrival



Aluminum

Antimony

Arsenic

Barium

Beryllium

Cadmium

Calcium

Chromium

Cobalt

Copper

Iron

Lead

Magnesium

Manganese

Mercury

Molyebdenum

Nickel

Potassium

Selenium

Silver

Sodium

Thallium

Vanadium

Zinc

Utah Domestic Source Criteria

(blank)

10

1,000

4

10

(blank)

50

(blank)

15

(blank)

2

(blank)

50

(blank)

Monitoring
Location

Site Description

Collection
Date

Collection Time

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

mg/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L





8/8/2015

5:40 PM

264

1.38

1.57

308

0.04

ND

49.2

ND

0.13

3.95

144

ND

5.75

2.81

ND

3.15

0.89

4.15

0.92

0.1

62.6

ND

3.13

14.2





8/10/2015

11:53 AM

325

0.38

1.94

299

ND

ND

44.6

ND

0.1

2.95

140

0.32

7.84

2.55

ND

2.43

ND

3.41

0.61

0.03

43.6

ND

7.59

17.6





8/10/2015

4:44 PM

149

1.26

1.4

265

ND

ND

44.2

ND

0.08

2.48

ND

0.32

7.87

ND

ND

2.63

ND

3.35

0.75

0.19

41.9

ND

6.67

18.5





8/11/2015

11:31 AM

907

1.42

1.98

391

0.05

ND

37.2

ND

0.18

3.13

382

ND

6.72

4.55

ND

2.46

0.85

3.29

0.78

0.21

51.3

0.04

7.82

12.4





8/11/2015

3:43 PM

1790

1.23

1.59

445

0.07

ND

43.6

ND

0.31

5.28

787

0.57

7.19

11.6

ND

1.98

1.02

3.11

0.82

0.23

41.4

0.03

4.55

17.4

4953000

San Juan R @ Mexican

8/12/2015

12:09 PM

125

1.41

1.59

245

0.03

ND

59.8

ND

0.05

3.34

ND

ND

7.86

ND

ND

2.27

ND

3.09

0.92

0.15

42.1

ND

3.07

14.2

Hat US163 Xing

8/12/2015

5:50 PM

105

2.23

1.79

185

0.09

ND

48.9

ND

0.07

3.19

ND

ND

7.22

ND

ND

2.64

ND

3.16

1.16

0.26

48.7

ND

4.34

16.1





8/13/2015

12:05 PM

293

1.61

2.06

201

ND

ND

42.6

ND

0.15

3.46

143

ND

7.21

3.54

ND

2.33

0.76

3.3

1.18

0.18

44.4

ND

7.13

19.8





8/14/2015

11:43 AM

120

1.04

2.33

157

0.04

ND

46.2

ND

0.24

5.86

ND

ND

10.5

2.43

ND

5.87

1.75

4.29

1.56

0.15

68

0.18

8.06

ND





8/15/2015

9:43 AM

135

1.04

1.7

117

0.03

ND

53.7

ND

0.58

8.56

ND

ND

9.03

7.42

ND

3.28

1.66

3.62

1.19

0.19

51.9

0.06

5.65

6.18





8/16/2015

11:58 AM

84.3

0.45

1.35

194

0.03

ND

57.7

ND

0.12

3.92

ND

ND

8.96

ND

ND

2.31

ND

3.5

0.84

0.03

40.2

ND

3.31

13.8





8/17/2015

3:04 PM

52.3

0.82

1.55

108

ND

ND

59.3

ND

0.13

2.85

ND

ND

10.3

ND

ND

2.55

1.23

3.42

0.86

0.19

37.3

0.04

3.4

ND





8/13/2015

2:42 PM

643

0.18

1.76

411

0.06

ND

52.3

ND

0.3

4.36

388

0.92

7.5

13.8

ND

2.16

1.09

3.09

0.91

ND

47

ND

4.99

19.2





8/14/2015

2:33 PM

38.5

0.32

1.89

121

ND

ND

51.1

ND

0.13

3.6

ND

ND

8.23

ND

ND

3.3

1.28

3.69

1.13

0.03

49.8

ND

5.38

ND

4952940

San Juan R @ Clay Hills

8/15/2015

2:30 PM

119

0.34

1.75

136

ND

ND

43.1

ND

0.08

2.6

ND

ND

8.99

ND

ND

4.27

0.95

3.62

1.18

ND

66.3

ND

5.48

ND





8/16/2015

2:46 PM

925

0.25

1.71

319

0.05

ND

52.7

ND

0.31

5.26

490

0.46

9.48

9.63

ND

2.78

0.84

4.17

0.91

ND

58.2

ND

5.71

20.6





8/17/2015

1:03 PM

101

0.26

1.63

132

ND

ND

53.2

ND

0.25

4.65

ND

ND

8.79

2.7

ND

2.55

1.36

3.89

0.73

ND

44.5

ND

4.83

ND

These data are provisional and subject to change
the interest of providing timely data to the public.

and are undergoing DWO's quality assurance and quality control procedures. Data are released in
Neither DWO nor the State of Utah may be held liable for any damages resulting fi'om its use.


-------
Comparison of San Juan River Raw Water Data with Screening Values for Agricultural Uses (Stock watering and Irrigation) - Dissolved
Metals



No Exceedence

lAbove Screenini

Prior to Plume Arrival



Estimated Plume Arrival

Post Plume Arrival



Al uminum

Antimony

Arsenic

Barium

Beryllium

Cadmium

Calcium

Chromium

Cobalt

Copper

Iron

Lead

Magnesium

Manganese

Mercury

Molyebdenum

Nickel

Potassium

Selenium

Silver

Sodium

Thallium

Vanadium

Zinc

Sulfphate

Total Dissolved
Solids

Livestock Water

5,000

(blank)

200

(blank)

50

500

1,000

500

(blank)

100

250,000

(blank)

10

(blank)

50

(blank)

1,000,000

(blank)

100

25,000

(blank)

1,200

Irrigation Water Short-term NAS, 1972

5,000

(blank)

100

(blank)

10

(blank)

100

50

200

5000

(blank)

200

(blank)

10

200

(blank)

20

(blank)

100

2,000

(blank)

500,000

Irrigation Water Long-term NAS, 1972

20,000

(blank)

2,000

(blank)

50

(blank)

1,000

5,000

20,000

10,000

(blank)

10,000

(blank)

50

2,000

(blank)

20

(blank)

1000

10,000

(blank)

Utah DWQ Agricultural Use Criteria 4



100

(blank)

10

(blank)

100

(blank)

200

(blank)

100

(blank)

50

(blank)

1,200

Monitoring
Location

Site Description

Collection Date

Collection Time

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

mg/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

mg/L

mg/L





8/8/2015

1:23 PM

217

0.524

1.34

222

0.04

ND

51.5

ND

0.127

2.24

95.8

ND

7.85

2.94

ND

1.87

ND

2.96

0.72

ND

32.2

ND

4.86

15.3

111

460





8/9/2015

12:02 PM

258

0.341

0.63

274

ND

ND

50.6

ND

0.0817

2.48

119

ND

6.86

2.69

ND

2.01

ND

2.61

0.56

0.0257

28.5

ND

1.76

18.5

120

400





8/9/2015

3:05 PM

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

112

350





8/9/2015

6:00 PM

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

99.1

410





8/9/2015

9:02 PM

329

0.347

0.95

341

0.04

ND

46

ND

0.139

3.47

198

0.274

6.3

4.14

ND

1.94

ND

2.38

0.54

ND

30

ND

2.07

15.4

97.3

430





8/10/2015

9:11 AM

172

0.458

0.99

233

ND

ND

44.6

ND

0.0673

3.21

103

0.391

6.01

1.64

ND

2.03

ND

2.51

0.58

ND

34.1

ND

1.74

19.7

99.7

380



San Juan R @ US 160 )$ng
in CO

8/10/2015

2:06 PM

1,050

0.711

1.3

220

0.09

ND

44.2

ND

0.407

3.35

732

1.04

6.02

12.8

ND

1.92

0.84

2.72

0.65

0.0586

35.1

ND

3.64

18

102

490

4954000

8/11/2015

8:50 AM

3,290

0.364

1.72

451

0.1

ND

39.8

ND

0.488

4.85

1520

1.1

5.05

19

0.015

1.65

1.19

3

0.97

ND

43.7

ND

3.9

19.1

100

380



8/11/2015

1:17 PM

720

0.0516

1.33

334

ND

ND

41.7

ND

0.155

3.03

366

0.27

5.11

5.1

ND

1.58

ND

2.91

0.76

ND

37

ND

2.46

14.9

99.2

290





8/12/2015

9:50 AM

104

0.586

0.88

178

ND

ND

52.1

ND

0.0614

2.39

ND

ND

7.2

ND

ND

1.47

ND

2.79

0.78

0.0252

30.3

ND

1.9

14.8

118

620





8/12/2015

2:04 PM

155

0.548

1.21

151

ND

ND

47.9

ND

0.0478

2.61

ND

ND

6.97

1.82

ND

1.48

ND

2.74

0.73

ND

27.3

ND

2.87

16.5

102

450





8/13/2015

10:01 AM

257

0.158

1.25

213

0.03

ND

48.3

ND

0.122

3.67

148

0.373

6.48

3.16

ND

1.89

ND

2.87

0.86

ND

42.5

ND

2.1

21.9

121

450





8/14/2015

2:33 PM

65

0.421

1.7

72.3

0.04

ND

53.4

ND

0.133

3.86

ND

ND

6.61

1.8

ND

3.65

3.14

3.66

1.1

ND

52.4

0.0385

4.11

ND

135

720





8/15/2015

12:04 PM

48

0.445

1.36

65.2

ND

ND

52.8

ND

0.052

1.35

ND

ND

7.91

ND

ND

2.25

ND

2.61

0.61

ND

25.9

ND

2.61

ND

106

580





8/16/2015

9:15 AM

54

1.12

0.88

179

0.04

ND

53.9

ND

ND

2.91

ND

ND

8.18

ND

ND

1.72

ND

2.54

0.6

0.186

26.1

ND

1.92

12.6

NS

980





8/8/2015

2:54 PM

136

0.747

1.06

223

0.04

ND

71.5

ND

0.13

2.72

ND

ND

9.92

ND

ND

2.62

0.8

3.84

1.11

0.0412

43.5

ND

2.54

21

195

610





8/10/2015

10:13AM

218

0.66

0.94

262

ND

ND

49.8

ND

0.0764

3.24

144

0.461

7.7

3.22

ND

2.03

ND

2.69

0.57

0.0529

32.1

ND

2.13

17.3

115

610





8/10/2015

2:58 PM

95

1.31

0.93

200

0.03

ND

48.6

ND

0.0595

2.48

ND

0.297

7.35

ND

ND

2.32

ND

2.59

0.61

0.251

31.8

ND

1.96

14.6

108

460





8/11/2015

9:44 AM

462

0.568

1.17

314

ND

ND

44.6

ND

0.127

2.66

227

ND

6.49

3.31

ND

1.72

ND

2.64

0.68

0.0307

37.1

ND

2.21

12.9

110

460





8/11/2015

2:20 PM

1,400

0.136

1.25

298

0.04

ND

44.8

ND

0.24

3.47

668

0.489

6.57

9.99

ND

1.72

0.95

2.96

0.74

ND

38.3

ND

2.73

14.3

110

620

4953990

San Juan R @ Town of

8/12/2015

10:37 AM

68

0.799

1.1

202

0.03

ND

48.3

ND

ND

2.49

ND

ND

7.23

ND

ND

1.66

ND

2.67

0.8

0.0397

31.9

ND

1.68

13.5

114

560

Montezuma

8/12/2015

2:57 PM

375

0.822

0.91

176

ND

ND

48.9

ND

0.0898

4.34

296

ND

7.5

2.28

ND

1.64

ND

2.84

0.72

0.0343

33.8

ND

1.99

15.9

123

460





8/13/2015

4:46 PM

330

1.88

1.28

240

0.07

ND

49.4

ND

0.18

3.75

192

ND

8.08

5.3

ND

1.91

0.98

2.62

0.98

0.235

32.9

0.025

3.12

32.7

125

370





8/14/2015

9:55 AM

25

0.582

1.27

85.1

0.04

ND

55.1

ND

0.146

3.79

ND

ND

7.81

ND

ND

2.84

1.76

3.51

0.99

0.0355

53

0.0272

3.07

ND

154

480





8/15/2015

11:31 AM

68

0.642

1.58

73.6

0.04

ND

55

ND

0.244

4.38

ND

ND

8.57

3.36

ND

2.43

1.09

3.16

0.89

0.0705

35.8

ND

3.54

ND

139

440





8/16/2015

10:02 AM

62

0.835

1.17

145

0.06

ND

57.5

ND

0.092

3.01

ND

ND

9.36

ND

ND

1.99

ND

2.96

0.67

0.283

30.3

0.0527

2.16

9.78

NS

1,170





8/17/2015

4:07 PM

27

0.285

1.17

80.4

ND

ND

60.2

ND

0.137

1.87

ND

ND

11.6

2.4

ND

1.97

ND

2.82

0.63

ND

29.4

ND

2.18

ND

NS

790





8/8/2015

4:19 PM

214

1.38

1.03

294

0.06

ND

73.7

ND

0.124

3.86

104

ND

9.24

2.55

ND

3.3

1.01

4.11

1.43

0.123

51.2

ND

2.22

19

226

640





8/10/2015

11:15AM

124

1.24

0.88

192

ND

ND

53.2

ND

0.0685

2.07

ND

0.287

8.4

ND

ND

2.38

ND

2.86

0.69

0.252

28.4

ND

1.75

13.7

124

370





8/10/2015

3:58 PM

108

0.574

1.07

184

ND

ND

48.4

ND

0.0556

1.96

ND

0.315

7.83

ND

ND

2.26

ND

2.67

0.53

ND

30.6

ND

1.89

13.2

118

490





8/11/2015

10:53 AM

684

1.18

1.23

278

0.06

ND

45.8

ND

0.172

2.87

328

ND

6.93

4.12

ND

1.92

0.78

2.72

0.69

0.269

36.8

0.031

2.55

13.7

114

390





8/11/2015

3:01 PM

158

0.271

1.01

251

ND

ND

45.3

ND

0.0864

2.69

89.2

ND

6.65

ND

ND

1.85

ND

2.76

0.67

ND

36.6

ND

2.05

14.9

112

360

4953250

San Juan R @ Sand Island

8/12/2015

11:12AM

623

1.08

1.41

205

0.05

ND

46.8

ND

0.154

3.44

310

ND

6.98

4.47

ND

1.93

ND

2.91

0.79

0.0594

37.8

ND

2.61

14.5

112

450

8/12/2015

5:06 PM

605

1.78

1.43

260

0.06

ND

46.6

ND

0.162

2.98

314

ND

7.07

5.16

ND

1.81

0.91

2.79

0.78

0.152

33.5

ND

2.32

13.2

109

410





8/13/2015

11:28 AM

509

0.667

1.3

156

0.03

ND

53.6

ND

0.21

3.1

275

ND

8.21

8.9

ND

1.62

ND

2.96

0.68

ND

29.2

ND

3.65

20.4

121

450





8/14/2015

11:02AM

ND

1.03

2.03

78.6

0.05

ND

53.2

ND

0.131

3.31

ND

ND

8.26

7.02

ND

5.31

2.38

3.27

1.08

0.193

49.5

0.129

5.88

4.87

146

630





8/15/2015

10:30 AM

95

1.12

1.84

83.5

0.04

ND

55.7

ND

0.085

2.27

ND

ND

8.4

ND

ND

3.93

0.82

3.46

1.06

0.276

46.7

0.0523

3.45

ND

164

540





8/16/2015

11:06 AM

290

0.425

1.23

149

0.04

ND

55.8

ND

0.146

3.89

202

ND

10.2

3.94

ND

1.95

ND

2.91

0.71

0.0426

36.3

ND

2.04

10.5

NS

1,020





8/17/2015

3:33 PM

ND

0.408

1.48

87.1

ND

ND

62.4

ND

0.172

2.11

ND

ND

11.2

ND

ND

2.67

1.28

3.13

0.63

ND

30

ND

2.75

ND

NS

930

These data are provisional and subject to change and are undergoing DWO's quality assurance and quality control procedures. Data are released in
the interest ofproviding timely data to the public. Neither DWO nor the State of Utah may be held liable for any damages resulting from its use.


-------


No Exceedence

lAbove Screenins

Prior to Plume Arrival



Estimated Plume Arrival

Post Plume Arrival



Alum inum

Antimony

Arsenic

Barium

Beryllium

Cadmium

Calcium

Chromium

Cobalt

Copper

Iron

Lead

Magnesium

Manganese

Mercury

Molyebdenum

Nickel

Potassium

Selenium

Silver

Sodium

Thallium

Vanadium

Zinc

Sulfphate

Total Dissolved
Solids

Livestock Water

5,000

(blank)

200

(blank)

50

500

1,000

500

(blank)

100

250,000

(blank)

10

(blank)

50

(blank)

1,000,000

(blank)

100

25,000

(blank)

1,200

1 rrigation Water Short-term NAS, 1972

5,000

(blank)

100

(blank)

10

(blank)

100

50

200

5000

(blank)

200

(blank)

10

200

(blank)

20

(blank)

100

2,000

(blank)

500,000

Irrigation Water Long-term NAS, 1972

20,000

(blank)

2,000

(blank)

50

(blank)

1,000

5,000

20,000

10,000

(blank)

10,000

(blank)

50

2,000

(blank)

20

(blank)

1000

10,000

(blank)

Utah DWQ Agricultural Use Criteria 4



100

(blank)

10

(blank)

100

(blank)

200

(blank)

100

(blank)

50

(blank)

1,200

Monitoring
Location

Site Description

Collection Date

Collection Time

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

mg/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

mg/L

mg/L





8/8/2015

5:40 PM

264

1.38

1.57

308

0.04

ND

49.2

ND

0.127

3.95

144

ND

5.75

2.81

ND

3.15

0.89

4.15

0.92

0.0956

62.6

ND

3.13

14.2

154

730





8/10/2015

11:53 AM

325

0.376

1.94

299

ND

ND

44.6

ND

0.102

2.95

140

0.315

7.84

2.55

ND

2.43

ND

3.41

0.61

0.0297

43.6

ND

7.59

17.6

126

590





8/10/2015

4:44 PM

149

1.26

1.4

265

ND

ND

44.2

ND

0.0789

2.48

ND

0.315

7.87

ND

ND

2.63

ND

3.35

0.75

0.193

41.9

ND

6.67

18.5

132

660





8/11/2015

11:31 AM

907

1.42

1.98

391

0.05

ND

37.2

ND

0.179

3.13

382

ND

6.72

4.55

ND

2.46

0.85

3.29

0.78

0.205

51.3

0.0362

7.82

12.4

117

980





8/11/2015

3:43 PM

1,790

1.23

1.59

445

0.07

ND

43.6

ND

0.311

5.28

787

0.569

7.19

11.6

ND

1.98

1.02

3.11

0.82

0.23

41.4

0.027

4.55

17.4

129

600

4953000

San Juan R @ Mexican Hat

8/12/2015

12:09 PM

125

1.41

1.59

245

0.03

ND

59.8

ND

0.0512

3.34

ND

ND

7.86

ND

ND

2.27

ND

3.09

0.92

0.151

42.1

ND

3.07

14.2

157

450

US 163 Xing

8/12/2015

5:50 PM

105

2.23

1.79

185

0.09

ND

48.9

ND

0.0691

3.19

ND

ND

7.22

ND

ND

2.64

ND

3.16

1.16

0.264

48.7

ND

4.34

16.1

143

470





8/13/2015

12:05 PM

293

1.61

2.06

201

ND

ND

42.6

ND

0.148

3.46

143

ND

7.21

3.54

ND

2.33

0.76

3.3

1.18

0.182

44.4

ND

7.13

19.8

135

490





8/14/2015

11:43 AM

120

1.04

2.33

157

0.04

ND

46.2

ND

0.236

5.86

ND

ND

10.5

2.43

ND

5.87

1.75

4.29

1.56

0.152

68

0.182

8.06

ND

173

760





8/15/2015

9:43 AM

135

1.04

1.7

117

0.03

ND

53.7

ND

0.575

8.56

ND

ND

9.03

7.42

ND

3.28

1.66

3.62

1.19

0.192

51.9

0.0557

5.65

6.18

191

710





8/16/2015

11:58 AM

84

0.447

1.35

194

0.03

ND

57.7

ND

0.12

3.92

ND

ND

8.96

ND

ND

2.31

ND

3.5

0.84

0.0298

40.2

ND

3.31

13.8

NS

1,380





8/17/2015

3:04 PM

52

0.817

1.55

108

ND

ND

59.3

ND

0.128

2.85

ND

ND

10.3

ND

ND

2.55

1.23

3.42

0.86

0.186

37.3

0.0425

3.4

ND

NS

880





8/13/2015

2:42 PM

643

0.18

1.76

411

0.06

ND

52.3

ND

0.3

4.36

388

0.924

7.5

13.8

ND

2.16

1.09

3.09

0.91

ND

47

ND

4.99

19.2

158

500





8/14/2015

2:33 PM

39

0.316

1.89

121

ND

ND

51.1

ND

0.125

3.6

ND

ND

8.23

ND

ND

3.3

1.28

3.69

1.13

0.0286

49.8

ND

5.38

ND

144

570

4952940

San Juan R @ Clay Hills

8/15/2015

2:30 PM

119

0.343

1.75

136

ND

ND

43.1

ND

0.0773

2.6

ND

ND

8.99

ND

ND

4.27

0.95

3.62

1.18

ND

66.3

ND

5.48

ND

159

920





8/16/2015

2:46 PM

925

0.25

1.71

319

0.05

ND

52.7

ND

0.314

5.26

490

0.458

9.48

9.63

ND

2.78

0.84

4.17

0.91

ND

58.2

ND

5.71

20.6

NS

1,480





8/17/2015

1:03 PM

101

0.263

1.63

132

ND

ND

53.2

ND

0.253

4.65

ND

ND

8.79

2.7

ND

2.55

1.36

3.89

0.73

ND

44.5

ND

4.83

ND

NS

1,020

These data are provisional and subject to change
the interest of providing timely data to the public.

and are undergoing DWO's quality assurance and quality control procedures. Data are released in
Neither DWO nor the State of Utah may be held liable for any damages resulting fi'om its use.


-------
Comparison of San Juan River Raw Water Data with Screening Values for Aquatic Life Use (Warm-water Fishery) - Dissolved Metals



No Exceedence

|Above Screening Level



Prior to Plume Arrival



Estimated Plume Arrival

Post Plume Arrival



Aluminum

Antimony

Arsenic

Barium

Beryllium

Cadmium

Calcium

Chromium

Cobalt

Copper

Iron

Lead

Magnesium

Manganese

Mercury

Molyebdenum

Nickel

Potassium

Selenium

Silver

Sodium

Thallium

Vanadium

Zinc

Utah Aquatic Life Use Criteria 1-hr

750

(blank)

340

(blank)

2

(blank)

570

(blank)

13

1,000

65

(blank)

468

(blank)

18.4

1.6

(blank)

120

Utah Aquatic Life Use Criteria 4-day

87

(blank)

150

(blank)

0.25

(blank)

74

(blank)

9

1,000

2.5

(blank)

0.01

(blank)

52

(blank)

4.6

(blank)

120

Monitoring
Location

Site Description

Collection
Date

Collection
Time

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

mg/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L





8/8/2015

1:23 PM

217

1

1

222

0.04

ND

52

ND

0.13

2.2

96

ND

8

3

ND

1.87

ND

3

0.7

ND

32

ND

5

15





8/9/2015

12:02 PM

258

0

1

274

ND

ND

51

ND

0.08

2.5

119

ND

7

3

ND

2.01

ND

3

0.6

0

29

ND

2

19





8/9/2015

9:02 PM

329

0

1

341

0.04

ND

46

ND

0.14

3.5

198

0

6

4

ND

1.94

ND

2

0.5

ND

30

ND

2

15





8/10/2015

9:11 AM

172

0

1

233

ND

ND

45

ND

0.07

3.2

103

0

6

2

ND

2.03

ND

3

0.6

ND

34

ND

2

20





8/10/2015

2:06 PM

1,050

1

1

220

0.09

ND

44

ND

0.41

3.4

732

1

6

13

ND

1.92

1

3

0.6

0

35

ND

4

18



San Juan R @ US160 Xing in
CO

8/11/2015

8:50 AM

3,290

0

2

451

0.10

ND

40

ND

0.49

4.9

1,520

1

5

19

0.02

1.65

1

3

1.0

ND

44

ND

4

19

4954000

8/11/2015

1:17 PM

720

0

1

334

ND

ND

42

ND

0.16

3.0

366

0

5

5

ND

1.58

ND

3

0.8

ND

37

ND

2

15



8/12/2015

9:50 AM

104

1

1

178

ND

ND

52

ND

0.06

2.4

ND

ND

7

ND

ND

1.47

ND

3

0.8

0

30

ND

2

15





8/12/2015

2:04 PM

155

1

1

151

ND

ND

48

ND

0.05

2.6

ND

ND

7

2

ND

1.48

ND

3

0.7

ND

27

ND

3

17





8/13/2015

10:01 AM

257

0

1

213

0.03

ND

48

ND

0.12

3.7

148

0

6

3

ND

1.89

ND

3

0.9

ND

43

ND

2

22





8/14/2015

2:33 PM

65

0

2

72

0.04

ND

53

ND

0.13

3.9

ND

ND

7

2

ND

3.65

3

4

1.1

ND

52

0.04

4

ND





8/15/2015

12:04 PM

48

0

1

65

ND

ND

53

ND

0.05

1.4

ND

ND

8

ND

ND

2.25

ND

3

0.6

ND

26

ND

3

ND





8/16/2015

9:15 AM

54

1

1

179

0.04

ND

54

ND

ND

2.9

ND

ND

8

ND

ND

1.72

ND

3

0.6

0

26

ND

2

13





8/8/2015

2:54 PM

136

1

1

223

0.04

ND

72

ND

0.13

2.7

ND

ND

10

ND

ND

2.62

1

4

1.1

0

44

ND

3

21





8/10/2015

10:13 AM

218

1

1

262

ND

ND

50

ND

0.08

3.2

144

0

8

3

ND

2.03

ND

3

0.6

0

32

ND

2

17





8/10/2015

2:58 PM

95

1

1

200

0.03

ND

49

ND

0.06

2.5

ND

0

7

ND

ND

2.32

ND

3

0.6

0

32

ND

2

15





8/11/2015

9:44 AM

462

1

1

314

ND

ND

45

ND

0.13

2.7

227

ND

6

3

ND

1.72

ND

3

0.7

0

37

ND

2

13





8/11/2015

2:20 PM

1,400

0

1

298

0.04

ND

45

ND

0.24

3.5

668

0

7

10

ND

1.72

1

3

0.7

ND

38

ND

3

14

4953990

San Juan R @ Town of

8/12/2015

10:37 AM

68

1

1

202

0.03

ND

48

ND

ND

2.5

ND

ND

7

ND

ND

1.66

ND

3

0.8

0

32

ND

2

14

Montezuma

8/12/2015

2:57 PM

375

1

1

176

ND

ND

49

ND

0.09

4.3

296

ND

8

2

ND

1.64

ND

3

0.7

0

34

ND

2

16





8/13/2015

4:46 PM

330

2

1

240

0.07

ND

49

ND

0.18

3.8

192

ND

8

5

ND

1.91

1

3

1.0

0

33

0.03

3

33





8/14/2015

9:55 AM

25

1

1

85

0.04

ND

55

ND

0.15

3.8

ND

ND

8

ND

ND

2.84

2

4

1.0

0

53

0.03

3

ND





8/15/2015

11:31 AM

68

1

2

74

0.04

ND

55

ND

0.24

4.4

ND

ND

9

3

ND

2.43

1

3

0.9

0

36

ND

4

ND





8/16/2015

10:02 AM

62

1

1

145

0.06

ND

58

ND

0.09

3.0

ND

ND

9

ND

ND

1.99

ND

3

0.7

0

30

0.05

2

10





8/17/2015

4:07 PM

27

0

1

80

ND

ND

60

ND

0.14

1.9

ND

ND

12

2

ND

1.97

ND

3

0.6

ND

29

ND

2

ND





8/8/2015

4:19 PM

214

1

1

294

0.06

ND

74

ND

0.12

3.9

104

ND

9

3

ND

3.30

1

4

1.4

0

51

ND

2

19





8/10/2015

11:15 AM

124

1

1

192

ND

ND

53

ND

0.07

2.1

ND

0

8

ND

ND

2.38

ND

3

0.7

0

28

ND

2

14





8/10/2015

3:58 PM

108

1

1

184

ND

ND

48

ND

0.06

2.0

ND

0

8

ND

ND

2.26

ND

3

0.5

ND

31

ND

2

13





8/11/2015

10:53 AM

684

1

1

278

0.06

ND

46

ND

0.17

2.9

328

ND

7

4

ND

1.92

1

3

0.7

0

37

0.03

3

14





8/11/2015

3:01 PM

158

0

1

251

ND

ND

45

ND

0.09

2.7

89

ND

7

ND

ND

1.85

ND

3

0.7

ND

37

ND

2

15

4953250

San Juan R @ Sand Island

8/12/2015

11:12 AM

623

1

1

205

0.05

ND

47

ND

0.15

3.4

310

ND

7

4

ND

1.93

ND

3

0.8

0

38

ND

3

15

8/12/2015

5:06 PM

605

2

1

260

0.06

ND

47

ND

0.16

3.0

314

ND

7

5

ND

1.81

1

3

0.8

0

34

ND

2

13





8/13/2015

11:28 AM

509

1

1

156

0.03

ND

54

ND

0.21

3.1

275

ND

8

9

ND

1.62

ND

3

0.7

ND

29

ND

4

20





8/14/2015

11:02 AM

ND

1

2

79

0.05

ND

53

ND

0.13

3.3

ND

ND

8

7

ND

5.31

2

3

1.1

0

50

0.13

6

5





8/15/2015

10:30 AM

95

1

2

84

0.04

ND

56

ND

0.09

2.3

ND

ND

8

ND

ND

3.93

1

3

1.1

0

47

0.05

3

ND





8/16/2015

11:06 AM

290

0

1

149

0.04

ND

56

ND

0.15

3.9

202

ND

10

4

ND

1.95

ND

3

0.7

0

36

ND

2

11





8/17/2015

3:33 PM

ND

0

1

87

ND

ND

62

ND

0.17

2.1

ND

ND

11

ND

ND

2.67

1

3

0.6

ND

30

ND

3

ND

These data are provisional and subject to change and are undergoing DWO's quality assurance and quality control procedures. Data are released in
the interest ofproviding timely data to the public. Neither DWO nor the State of Utah may be held liable for any damages resulting from its use.


-------


No Exceedence

|Above Screening Level



Prior to Plume Arrival



Estimated Plume Arrival

Post Plume Arrival



Aluminum

Antimony

Arsenic

Barium

Beryllium

Cadmium

Calcium

Chromium

Cobalt

Copper

Iron

Lead

Magnesium

Manganese

Mercury

Molyebdenum

Nickel

Potassium

Selenium

Silver

Sodium

Thallium

Vanadium

Zinc

Utah Aquatic Life Use Criteria 1-hr

750

(blank)

340

(blank)

2

(blank)

570

(blank)

13

1,000

65

(blank)

468

(blank)

18.4

1.6

(blank)

120

Utah Aquatic Life Use Criteria 4-day

87

(blank)

150

(blank)

0.25

(blank)

74

(blank)

9

1,000

2.5

(blank)

0.01

(blank)

52

(blank)

4.6

(blank)

120

Monitoring
Location

Site Description

Collection
Date

Collection
Time

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

mg/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L





8/8/2015

5:40 PM

264

1

2

308

0.04

ND

49

ND

0.13

4.0

144

ND

6

3

ND

3.15

1

4

0.9

0

63

ND

3

14





8/10/2015

11:53 AM

325

0

2

299

ND

ND

45

ND

0.10

3.0

140

0

8

3

ND

2.43

ND

3

0.6

0

44

ND

8

18





8/10/2015

4:44 PM

149

1

1

265

ND

ND

44

ND

0.08

2.5

ND

0

8

ND

ND

2.63

ND

3

0.8

0

42

ND

7

19





8/11/2015

11:31 AM

907

1

2

391

0.05

ND

37

ND

0.18

3.1

382

ND

7

5

ND

2.46

1

3

0.8

0

51

0.04

8

12





8/11/2015

3:43 PM

1,790

1

2

445

0.07

ND

44

ND

0.31

5.3

787

1

7

12

ND

1.98

1

3

0.8

0

41

0.03

5

17

4953000

San Juan R @ Mexican Hat

8/12/2015

12:09 PM

125

1

2

245

0.03

ND

60

ND

0.05

3.3

ND

ND

8

ND

ND

2.27

ND

3

0.9

0

42

ND

3

14

US163 Xing

8/12/2015

5:50 PM

105

2

2

185

0.09

ND

49

ND

0.07

3.2

ND

ND

7

ND

ND

2.64

ND

3

1.2

0

49

ND

4

16





8/13/2015

12:05 PM

293

2

2

201

ND

ND

43

ND

0.15

3.5

143

ND

7

4

ND

2.33

1

3

1.2

0

44

ND

7

20





8/14/2015

11:43 AM

120

1

2

157

0.04

ND

46

ND

0.24

5.9

ND

ND

11

2

ND

5.87

2

4

1.6

0

68

0.18

8

ND





8/15/2015

9:43 AM

135

1

2

117

0.03

ND

54

ND

0.58

8.6

ND

ND

9

7

ND

3.28

2

4

1.2

0

52

0.06

6

6





8/16/2015

11:58 AM

84

0

1

194

0.03

ND

58

ND

0.12

3.9

ND

ND

9

ND

ND

2.31

ND

4

0.8

0

40

ND

3

14





8/17/2015

3:04 PM

52

1

2

108

ND

ND

59

ND

0.13

2.9

ND

ND

10

ND

ND

2.55

1

3

0.9

0

37

0.04

3

ND





8/13/2015

2:42 PM

643

0

2

411

0.06

ND

52

ND

0.30

4.4

388

1

8

14

ND

2.16

1

3

0.9

ND

47

ND

5

19





8/14/2015

2:33 PM

39

0

2

121

ND

ND

51

ND

0.13

3.6

ND

ND

8

ND

ND

3.30

1

4

1.1

0

50

ND

5

ND

4952940

San Juan R @ Clay Hills

8/15/2015

2:30 PM

119

0

2

136

ND

ND

43

ND

0.08

2.6

ND

ND

9

ND

ND

4.27

1

4

1.2

ND

66

ND

5

ND





8/16/2015

2:46 PM

925

0

2

319

0.05

ND

53

ND

0.31

5.3

490

0

9

10

ND

2.78

1

4

0.9

ND

58

ND

6

21





8/17/2015

1:03 PM

101

0

2

132

ND

ND

53

ND

0.25

4.7

ND

ND

9

3

ND

2.55

1

4

0.7

ND

45

ND

5

ND

These data are provisional and subject to change
the interest of providing timely data to the public.

and are undergoing DWO's quality assurance and quality control procedures. Data are released in
Neither DWO nor the State of Utah may be held liable for any damages resulting fi'om its use.


-------