Earth Fissure Map of theChandler Heights Study Area:

Pinal and Maricopa County, ArizonaJune 2019

Arizona Geological SurveyDigital Map Series - Earth Fissure Map 1 (DM-EF-1)

version 5.0Notice The State of Arizona has made a reasonable effort to ensure the accuracy of this map when it was produced, but errors may be present and the state of Arizona does not guarantee its accuracy. The map supplements, and is not a substitute for, a professional inspection of property for defects and conditions. Introduction This is one of a series of earth fissure maps prepared by the Arizona Geological Survey (AZGS) in accordance with Ariz. Rev. Stat. § 27-152.01(3). AZGS collected location information from previously conducted earth fissure studies, reviewed available remote-sensing aerial and satellite imagery, and conducted surface site investigations throughout the study area. A reasonable effort was made to identify all earth fissures in the study area. Nonetheless, some fissures may remain unmapped as a result of one or more of the following: 1) Existing fissures may have been masked by construction or agricultural activities. 2) Incipient fissures may lack clear surface expression. 3) The surface expression of fissures changes constantly as new earth fissures develop and old

earth fissures fill in. A blank area on the map does not guarantee earth fissures are not present. However, blank areas within the study area boundary have been investigated, and no surface evidence of fissures was found as of the date of map publication. Determining the presence or absence of a fissure at any specific site may require additional mapping and/or geotechnical analysis.

Air photo base compiled from 2015, 1 meter NAIP (National Agriculture Imagery Program) digital ortho imagery. Transporation network dataset compiled by Arizona State Lands Dept. by combining the 2007 County Road Data of Maricopa, Pima, Pinal and Cochise Counties with the Census 2000 Tiger/Line Data of the remaining Counties. Map projection and blue, 1000-meter grid ticks: Universal Transverse Mercator, zone 12 North American Datum 1983 HARN References Geological Consultants Inc., 2002, Task 2 Subsurface earth fissure investigation program, Northslope

development, Pinal County, Arizona: Geological Consultants Inc. Report, Project No. 2002-153T2, 19 p.

Geological Consultants Inc., 2006, Land Subsidence and Earth Fissure Evaluation Task 1 and Task

2, Santanilla, SW Corner Riggs Road and Higley Road, Gilbert, Maricopa County, Arizona: Geological Consultants Inc. Report Project No. 2006-147, 27 p.

Geological Consultants Inc., 2006, Land Subsidence and Earth Fissure Evaluation - Task 1, Vicinity

of Hunt Highway and Thompson Road, Pinal County, Arizona: Geological Consultants Inc. Report, Project No. 06-169, 25 p.

Geological Consultants Inc., 2007, Earth fissure investigation report November 2007 update, San Tan

Heights development, Pinal County, Arizona: Geological Consultants Inc. Report, Project No. 03-168, 22 p., 2 plates.

Harris, R.C., 1994, A reconnaissance of earth fissures near Apache Junction, Chandler Heights, and

southwestern Picacho Basin: Arizona Geological Survey Open-File Report 94-11, 5 p., 2 sheets, scales 1:24,000 and 1:26,700.

Laney, R.L., Raymond, R.H., and Winikka, C.C., 1978, Maps showing water-level declines, land

subsidence, and earth fissures in south-central Arizona: U.S. Geological Survey Water-Resources Investigations Open-File Report WRI 78-0083, 2 sheets, scale 1:125,000.

NAIP Orthoimagery (1-Meter GSD), 2015, USDA-FSA-APFO Aerial Photography Field Office, Salt

Lake City, Utah.

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Arizona Geological SurveyDM-EF-1 (Chandler Heights), v. 5.0

1:24,000 Scale1 0 10.5 Miles

1 0 10.5 Kilometers

0 1000 2000 3000 4000 5000 Feet ±

0 2.5 5Miles

Arizona Geological Survey1955 East Sixth Street, PO Box 210184

Tucson, AZ 85721(520) 621-2470

www.azgs.arizona.edu

MAP LEGENDRed lines represent the location of continuous earth fissures manifested as open cracks orgullies.Orange lines represent the location of discontinuous earth fissures manifested as elongatedto circular depressions or as abbreviated or irregular linear depressions. Thesediscontinuous surface features frequently represent an incipient surface expression of anearth fissure.Yellow lines represent the location of fissures confirmed by non-AZGS personnel or clearevidence of earth fissures on aerial imagery. Traditional field investigation of these featuresby AZGS was hindered by agricultural or urban modification of the land surface.Green lines represent the approximate locations of unconfirmed earth fissures, defined asfissures which could not be confirmed by surface investigations by AZGS geologists, butwhich have been previously reported by Professional Geologists in published documents ormaps.The outline of the Study Area is shown in blue. The limits of the study area are based oninterpretation of modern and recent ground subsidence data provided by the ArizonaDepartment of Water Resources. Historical and modern aerial photos taken within thisarea were searched for anomalous lineaments. These lineaments were then investigated inthe field to determine if there was any evidence of earth fissures.

Location mapstudy area shown in blue

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