Appendix of the draft environmental impact statement for Tusayan growth: Kaibab National Forest

308 Pages·1997·15.5 MB·English

by  U.S. Forest Service

)iOcLrJj/A\ United States Appendix of the Draft
Department Of
Agriculture
Forest Environmental Impact
Service
Southwestern
Region Statement Tusayan
for
Growth
Kaibab National Forest
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Printedon recycledpaper•5/97
APPENDIX
of
DRAFT ENVIRONMENTAL
IMPACT STATEMENT
for
Tusayan Growth
Coconino County, Arizona
Lead Agency: USDA, Forest Service
Kaibab National Forest
Cooperating Agencies: USDI, Grand Canyon National Park
Coconino County
Northern Arizona Council ofGovernments
Responsible Official: Charles W. Cartwright, Jr., Regional Forester
Regional Office, Southwestern Region
NM
Albuquerque, 87102
For Further Information: R. Dennis Lund
Kaibab National Forest
800 S. 6th Street
Williams, AZ 86046
[phone]
Digitized by the Internet Archive
in 2012 with funding from
LYRASIS IVIembers and Sloan Foundation
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Introduction
This appendix includes three documents that are referenced throughout the Draft Environmental
Impact Statement for Tusayan Growth. They are:
The "Assessment of Hydrogeologic Conditions and Potential Effects of
Proposed Groundwater Withdrawal for Canyon Forest Village, Coconino
County, AZ" was produced by Errol L. Montgomery and Associates, Inc.,
Consultants in Hydrogeology. This document provides the results of the
hydrogeological study that was conducted for this analysis.
The "Tusayan Area Plan", which was adopted by the Coconino County
Board of Supervisors in June 1995, outlines policy and direction for
future development in the Tusayan area.
The "Tusayan Growth Environmental Impact Statement Economic
Analysis" was prepared by Young Nichols Gilstrap, Inc. and Warnick &
Company and provides an overview of the existing and projected future
socioeconomic condition of the areas affected by this analysis. It also
presents a study of the potential socioeconomic impacts of the alterna-
tives presented in the Draft Environmental Impact Statement.

July 5, 1996
REPORT
ASSESSMENT OF HYDROGEOLOGIC CONDITIONS AND
POTENTIAL EFFECTS OF PROPOSED GROUNDWATER WITHDRAWAL
FOR CANYON FOREST VILLAGE
COCONINO COUNTY, ARIZONA
ERROL L. MONTGOMERY & ASSOCIATES, INC.
CONSULTANTS IN HYDROGEOLOGY
7949EASTAOOMADRIVE,SUITE 100
SCOnSDALE,ARIZONA85260 [phone]
TUCSON * PHOENIX * FIAGSTAFF

ERROL L. MONTGOMERY & ASSOCIATES. INC.
July 5. 1996
REPORT
ASSESSMENT OF HYDROGEOLOGIC CONDITIONS AND
POTENTIAL EFFECTS OF PROPOSED GROUNDWATER WITHDRAWAL
FOR CANYON FOREST VILLAGE
COCONINO COUNTY, ARIZONA
ERROL L. MONTGOMERY & ASSOCIATES, INC.
CONTENTS
Page
EXECUTIVE SUMMARY
1
INTRODUCTION 9
PREVIOUS INVESTIGATIONS 11
HYDROGEOLOGIC CONDITIONS 12
STRATIGRAPHY AND HYDROGEOLOGIC CHARACTERISTICS 12
Alluvial Deposits 13
Volcanic Rocks 14
Moenkopi Formation 14
Kaibab Formation 15
Toroweap Formation 15
Coconino Sandstone 16
Hermit Formation 17
Supai Group 17
Surprise Canyon Formation 18
Redwall Limestone, Temple Butte Formation, and Muav Lime-
stone 19
Bright Angel Shale and Tapeats Sandstone 20
Precambrian Rocks 21
STRUCTURAL FEATURES 21
GROUNDWATER OCCURRENCE AND MOVEMENT 22
Recharge 23
Groundwater Occurrence in Perched Aquifers 23
Discharge from Perched Aquifer Springs 24
Groundwater Occurrence and Movement in the Redwall -Muav
Aquifer 24
Discharge from Redwall -Muav Aquifer Springs 25
Yield from Redwall -Muav Aquifer Wells 26
DRILLING TARGETS FOR WATER WELLS FOR CANYON FOREST VILLAGE 29
. .
CONCEPTUAL MODEL FOR THE REDWALL-MUAV AQUIFER SYSTEM 30
COMPUTER-BASED GROUNDWATER FLOW MODEL 33
MODEL SELECTION 33
MODEL BOUNDARIES AND GRID DESIGN 35
STEADY-STATE FLOW MODEL: INPUT PARAMETERS AND CALIBRATION
PROCEDURES 37
Groundwater Level 37
Discharge from Springs 39
Distribution of Recharge 41
Fault Interconnections 44
Results of Steady-State Simulations 46
STEADY-STATE MODEL: RESULTS OF CALIBRATION 47
Distribution of Recharge 48