Base extracted from U.S. Geological Survey 1:7,500-scale Digital Raster Graphic (DRG), 2004

Universal Transverse Mercator projection, Zone 12

Horizontal coordinate information is referenced to the North American Datum of 1983 (NAD83)

Vertical coordinate information is referenced to the North Americal Vertical Datum of 1988 (NAD88)

Concentration of 1,4-Dioxane in Wells Sampled During 2002–2009 in the Vicinity of theTucson International Airport Area Superfund Site, Arizona

By

Fred D Tillman

2010

When this map is printed on an electronic plotter directly from digital files, dimensional calibration may vary between X and Y directions on the same plotter, and paper may change size due to atmospheric conditions; therefore, scale and proportions may not be true on plots of this map

For sale by U.S. Geological Survey, Information Services, Box 25286, Federal Center, Denver, CO 80225, or call 1-888-ASK-USGS

Available at http://pubs.usgs.gov/sim/3113

1 KILOMETER1 0.125 0.25 0.5 0.75

1 MILE1 0.125 0.25 0.5 0.75SCALE 1: 7 500 Data compiled by Fred D Tillman

Digital cartography by Fred D Tillman

Edited by J.L. Zigler; cartography by D.A. Ryan

Manuscript approved for publication January 29, 2010

INTE

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9

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9

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DREXEL RD

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VALENCIA RD VALENCIA RD

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FLAGSTAFF

PRESCOTT

PHOENIX

YUMA

TUCSONTUCSON INTERNATIONAL AIRPORT AREA

SUPERFUND SITE

U.S. DEPARTMENT OF THE INTERIORU.S. GEOLOGICAL SURVEY

SCIENTIFIC INVESTIGATIONS MAP 3113Prepared in cooperation with the

U.S. AIR FORCE CENTER FOR ENGINEERING AND THE ENVIRONMENT—RESTORATION PROGRAM MANAGMENT OFFICE

EXPLANATION

!.

!.

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Monitoring well

Supply well

Private well

Former supply well

Display All

Select well type to displayonly that well type.

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

PW020 Well Depth140 (ft)

Openingunknown

Sample collection date (20xx)

Data source

Depth of well, if known, in feet below land surface

USEPA Drinking WaterAdvisory Level of 3 ppb

1,4-dioxane concentration, in parts per billion (micrograms per liter)

USEPA Region 9 Preliminary Remediation Goal of 6.1 ppb

Well identifier

Depth of well opening, if known, in feet below land surface

Pima DEQUSGS

Data Source (See References Cited for complete source reference)

Pima DEQ Pima County Department of Environ- mental Quality (2009)Tucson Intl Airport Connestoga-Rovers & Associates (2007, 2009)Tucson Water Malcolm Pirnie, Inc. (2007, 2009)USGS Tillman (2009)

IntroductionExtensive groundwater contamination resulting from industrial activities led to the listing of the Tucson International Airport Area as a Superfund Site in 1983. Early investigations revealed elevated levels of volatile organic compounds (VOCs) including the chlorinated solvents trichloroethylene (TCE) and perchloroethy-lene (PCE) in wells in the area. Several responsible parties were identified and cleanup activities were begun in the late 1980s using technology designed for removal of VOCs. In 2002, the compound 1,4-dioxane was discovered in wells in the Tucson Airport Remediation Project (TARP) area. Since then, 1,4-dioxane has been detected throughout the TARP area, in some cases exceeding the U.S. Environmental Protection Agency (USEPA) drinking water advisory level of 3 μg/L (U.S. Environmental Protection Agency, 2006).

Purpose and ScopeThe purpose of this map is to present 1,4-dioxane temporal data from wells sampled from 2002 through 2009 in the TARP area, which shows trends in well concentrations. This map includes data from wells in the commercial and residential community in the TARP area and does not include data from wells in suspected or confirmed source areas such as Air Force Plant 44 and Tucson International Airport or from wells within treatment facilities. Data from agency reports including the U.S. Geological Survey, Pima County Department of Environmental Quality, Tucson International Airport, and Tucson Water are included on the map.

MethodsData from all wells sampled and analyzed for 1,4-dioxane in the TARP area were compiled from available sources (Appendix A at http://pubs.usgs.gov/sim/3113/). These data were plotted on time-series charts, using a value of one-half the reporting limit for all samples reported as “non-detect”. All charts utilize the same scale of data points for both the horizonal sample date and the vertical 1,4-dioxane concentration. This permits ease of comparison of concentration levels between wells. Basic well construction information of depth of well in feet below land surface and depth of well openings in feet below land surface, if available, is placed in the chart header with the local well identifier. Well construction information and well location information were obtained from the U.S. Geological Survey and the Arizona Department of Water Resources databases. Horizontal dashed lines on the charts indicate the USEPA Region 9 Preliminary Remediation Goal of 6.1 ppb (U.S. Environmental Protection Agency, 2009) and the USEPA Drinking Water Advisory Level of 3 ppb (U.S. Environmental Protection Agency, 2006). Well locations are plotted on an aerial photo of the TARP area in a Geographic Information System (GIS) using colored symbols to differentiate between monitoring, supply, former supply, and private wells. Charts are placed as closely as possible to well locations on the map, and colored arrows link the chart to the well.Wells were sampled using collection, handling, and analysis methods approved by each collecting organization (see data sources listed in explanation for informa-tion on sample collection and analysis methods). Former supply wells were sampled using disposable polyethylene bailers and were not purged prior to sample collection. While a significant mass of dissolved 1,4-dioxane is not likely to volatilize out of water under natural conditions, results from these bailed wells indicate only the concentration of 1,4-dioxane in the borehole water at the time of sampling and do not necessarily represent concentrations in the surrounding aquifer.

AcknowledgementsThe author wishes to thank Marc Herman of Pima County Department of Environmental Quality, Craig Kafura of Arizona Department of Environmental Quality, Fred Brinker of the Tucson International Airport Authority, Catherine Schladweiler of Malcolm Pirnie, Arizona Department of Water Resources, and Conestoga-Rovers and Associates for providing access to information and data used in this report. In particular, the author would like to thank Stephen Dean, Joe Huerstel, Nagieb Mussa, and Michael Dew of the City of Tucson Water Department for their continued assistance in sampling wells in the TARP area.

References CitedConestoga-Rovers & Associates, 2007, Groundwater monitoring results for 1,4-dioxane sampling, TIAA superfund site—Airport property, Tucson, Arizona:

Conestoga-Rovers & Associates, Reference No. 013711-89, 130 p.Conestoga-Rovers & Associates, 2009, Groundwater monitoring results for 1,4-dioxane sampling, TIAA superfund site—Airport property, Tucson, Arizona:

Conestoga-Rovers & Associates, Reference No. 013711-281, 12 p.Malcolm Pirnie, Inc., 2007, Tucson International Airport area Groundwater Remediation Project, semi-annual status report, September 2006 through February

2007: Malcolm Pirnie, Inc., no. 1830-086, 193 p.Malcolm Pirnie, Inc., 2009, Tucson International Airport Area Groundwater Remediation Project, semi-annual status report, March 2009 through August 2009:

Malcolm Pirnie, Inc., no. 1830-086, 202 p.Pima County Department of Environmental Quality, 2009, South-side private well monitoring program, Tucson International Airport area superfund site, Tucson,

Arizona: Pima County Department of Environmental Quality, Annual Report, April 2009, 52 p.Tillman, F.D, 2009, Results of the analyses for 1,4-dioxane of groundwater samples collected in the Tucson Airport Remediation Project area: U.S. Geological

Survey Open-File Report 2009-1196, 14 p.U.S. Environmental Protection Agency, 2006, 2006 Edition of the drinking water standards and health advisories: U.S. Environmental Protection Agency, Office of

Water, EPA 822-R-06-013, 18 p. [http://www.epa.gov/waterscience/criteria/drinking/dwstandards.pdf, last accessed August 17, 2009].U.S. Environmental Protection Agency, 2009, Regional screening levels (RSL) for chemical contaminants at superfund sites: U.S. Environmental Protection

Agency RSL Table Update, April 2009, 85 p. [http://www.epa.gov/region09/superfund/prg/pdf/composite_sl_table_bwrun_APRIL2009.pdf, last accessed August 17, 2009].

32°10'N

32°09'N

32°08'N

110°57'W110°58'W110°59'W

110°57'W110°58'W110°59'W

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32°08'N

0202468

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03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

D-7 Well Depth139 (ft)

Opening129-139 (ft)

Tucson Intl Airport

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

S-37 Well Depth112 (ft)

Opening101-110 (ft)

Tucson Intl Airport

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

S-39 Well Depth131 (ft)

Opening126-129 (ft)

Tucson Intl Airport

0202468

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03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

S-26 Well Depth126 (ft)

Opening108-123 (ft)

Tucson Intl Airport

0202468

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1,4-

DIOX

ANE

(ppb

)

06 07 08 09

EW-4 Well Depth126 (ft)

Opening109-119 (ft)

Tucson Intl Airport

EPA 7 Well Depth393 (ft)

Opening323-372 (ft)

0202468

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1,4-

DIOX

ANE

(ppb

)

06 07 08 09

USGS

0202468

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1,4-

DIOX

ANE

(ppb

)

06 07 08 09

EPA 10 Well Depth235 (ft)

Opening167-215 (ft)

Tucson WaterUSGS

0202468

10121416

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1,4-

DIOX

ANE

(ppb

)

06 07 08 09

WR-055 B Well Depth233 (ft)

Opening213-233 (ft)

Tucson WaterUSGS

0202468

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03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

WR-056 B Well Depth178 (ft)

Opening158-178 (ft)

Tucson WaterUSGS

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

WR-056 C Well Depth130 (ft)

Opening110-130 (ft)

Tucson WaterUSGS

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

WR-057 A Well Depth160 (ft)

Opening130-160 (ft)

Tucson WaterUSGS

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

WR-058 A Well Depth400 (ft)

Opening360-400 (ft)

Tucson WaterUSGS

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

WR-058 B Well Depth144 (ft)

Opening124-144 (ft)

Tucson WaterUSGS

WR-059 A Well Depth401 (ft)

Opening361-401 (ft)

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

USGS

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

WR-059 B Well Depth141 (ft)

Opening121-141 (ft)

Tucson WaterUSGS

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

WR-076 S Well Depth400 (ft)

Opening300-400 (ft)

Tucson WaterUSGS

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

WR-077 S Well Depth130 (ft)

Opening100-130 (ft)

Tucson WaterUSGS

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

WR-078 S Well Depth160 (ft)

Opening110-160 (ft)

Tucson WaterUSGS

Tucson WaterUSGS

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

WR-079 S Well Depth145 (ft)

Opening95-145 (ft)

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

WR-081 S Well Depth175 (ft)

Opening95-175 (ft)

Tucson WaterUSGS

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

WR-082 S Well Depth158 (ft)

Opening108-158 (ft)

Tucson WaterUSGS

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

WR-080 S Well Depth150 (ft)

Opening100-150 (ft)

Tucson WaterUSGS

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

WR-084 S Well Depth160 (ft)

Opening130-160 (ft)

Tucson WaterUSGS

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

WR-085 S Well Depth190 (ft)

Opening110-190 (ft)

Tucson WaterUSGS

Tucson WaterUSGS

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

WR-086 S Well Depth140 (ft)

Opening100-140 (ft)

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

WR-241 A Well Depth402 (ft)

Opening152-402 (ft)

Tucson WaterUSGS

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

WR-163 A Well Depth350 (ft)

Opening300-350 (ft)

Tucson WaterUSGS

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

WR-091 S Well Depth175 (ft)

Opening125-175 (ft)

Tucson WaterUSGS

0202468

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1,4-

DIOX

ANE

(ppb

)

06 07 08 09

WR-087 S Well Depth240 (ft)

Opening140-240 (ft)

Tucson WaterUSGS

0202468

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03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

WR-089 S Well Depth405 (ft)

Opening300-400 (ft)

Tucson WaterUSGS

0202468

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03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

WR-090 S Well Depth215 (ft)

Opening115-215 (ft)

Tucson Water020

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1,4-

DIOX

ANE

(ppb

)

06 07 08 09

WR-165 A Well Depth350 (ft)

Opening300-350 (ft)

Tucson WaterUSGS

0202468

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1,4-

DIOX

ANE

(ppb

)

06 07 08 09

WR-236 A Well Depth250 (ft)

Opening150-250 (ft)

Tucson WaterUSGS

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

WR-237 A Well Depth400 (ft)

Opening150-400 (ft)

Tucson WaterUSGS

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

WR-240 A Well Depth400 (ft)

Opening150-400 (ft)

Tucson WaterUSGS

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

WR-239 A Well Depth400 (ft)

Opening150-400 (ft)

Tucson WaterUSGS

0202468

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03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

WR-238 A Well Depth380 (ft)

Opening150-280 (ft)

Tucson WaterUSGS

0202468

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1,4-

DIOX

ANE

(ppb

)

06 07 08 09

WR-700 A Well Depth177 (ft)

Opening100-170 (ft)

Tucson WaterUSGS

PW-020 Well Depth140 (ft)

Openingunknown

0202468

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1,4-

DIOX

ANE

(ppb

)

06 07 08 09

Pima DEQUSGS

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

Pima DEQ

PW-011 Well Depth223 (ft)

Openingunknown

0202468

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03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

PW-003 Well Depthunknown

OpeningunknownPima DEQ

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

PW-012 Well Depth212 (ft)

OpeningunknownPima DEQ

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

Pima DEQ

PW-013 Well Depthunknown

Openingunknown

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

PW-014 Well Depthunknown

OpeningunknownPima DEQ 020

2468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

PW-007 Well Depth150 (ft)

OpeningunknownPima DEQ

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

R-001 A Well Depth165 (ft)

Opening110-150 (ft)

Tucson WaterUSGS

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

R-002 A Well Depth171 (ft)

Opening110-150 (ft)

Tucson WaterUSGS

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

R-003 A Well Depth169 (ft)

Opening120-155 (ft)

Tucson WaterUSGS

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

R-004 A Well Depth175 (ft)

Opening125-160 (ft)

Tucson WaterUSGS

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)06 07 08 09

R-006 A Well Depth419 (ft)

Opening180-400 (ft)

Tucson WaterUSGS

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

R-007 A Well Depth424 (ft)

Opening178-398 (ft)

Tucson WaterUSGS

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

R-008 A Well Depth426 (ft)

Opening180-400 (ft)

Tucson WaterUSGS

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

R-009 A Well Depth425 (ft)

Opening175-395 (ft)

Tucson WaterUSGS

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

SS-021 A Well Depth320 (ft)

Opening120-300 (ft)

Tucson WaterUSGS

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

SS-023 B Well Depth420 (ft)

Opening260-400 (ft)

Tucson WaterUSGS

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

R-005 A Well Depth155 (ft)

Opening100-140 (ft)

Tucson WaterUSGS

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

B-103 A Well Depth522 (ft)

Opening65-150USGS

C-066 A Well Depth743 (ft)

Opening68-743 (ft)

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

USGS

C-081 A Well Depth520 (ft)

Opening79-520 (ft)

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

USGS

C-077 A Well Depth150 (ft)

Opening50-150 (ft)

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

USGS

C-078 A Well Depth230 (ft)

Opening32-230 (ft)

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

USGS

C-064 A Well Depth189 (ft)

Opening75-165 (ft)

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

USGS

C-064 B Well Depth900 (ft)

Opening107-900 (ft)

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

USGS

0202468

10121416

03 04 05SAMPLE DATE

1,4-

DIOX

ANE

(ppb

)

06 07 08 09

PK-010 A Well Depth250 (ft)

Opening92-250

USGS