Cochise County

1
Cochise County Board of Supervisors Public Heari
ngAugust 22, 2006 Docket Z-06-06 Rezoning 2
8 Acres from RU-4 to TR-36 Jack Farkas Katie H
ough, Applicants
2
Outline

• Provide a project overview
• Review project Water Budget and review
  Babocomari Water Budget
  
• Review conditions imposed by County staff
• Review Actions Completed On-going
• Conclusion / Summary

3
Project Overview

• 28 acres with 28 homes
• Site-built homes only
• Minimum of 1,700 sf livable
• Conforms to Babocomari Plan
• policies growth designations
• Water Conservation Measures
• Detention basins
• Landscaping w/ drought-tolerant/low-water use
  plants
  
• Turf limitations
• Hot-water recirculating
• systems low-flow fixtures
• Building envelope
• _at_ 15k sf(41.7)
• Evaporative cooling only not allowed

4
Project Overview (cont.)
5
Project Overview Combined Water Budget

• Water Conservation or
• Recharge Measures
• 4.34 af/yr
• Water Budget Offset
• 1.85 af/yr (compared to
• development _at_ RU-4)

6
Babocomari Rezonings
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Babocomari Rezonings Water Budget Offset

• Water Conservation or
• Recharge Measures
• 217 af/yr
• Water Budget Offset
• 161 af/yr (compared to
• development _at_ RU-4)

8
County Staff Conditions

• Landowners must secure an approved subdivision
  in substantial conformance
  
• with rezoning application
• Landowners must conduct Traffic Impact Analysis
  (TIA)
  
• Landowners must have development agreement in
  place specifying funding,
  
• timing and responsibility for implementing
  TIA-dictated improvements
  
• Landowners must provide a comprehensive
  hydrology report to address
  
• drainage issues on subject and adjacent
  lands
  
• Landowners shall adequately demonstrate that
  projected water consumption
  
• will not exceed threshold
• Landowners shall ensure that approved language
  is used to alert homeowners
  
• of military activities in the area

9
Actions Completed On-Going

• Applicants are members of Babocomari Development
  Association (BDA)
  
• Nonprofit organization representing 22
  landowners and 1,955 acres in Babocomari
  
• Babocomari Road Traffic Signal Improvement
  District Petition approved by
  
• Board of Supervisors on April 25, 2006
• Traffic Impact Analysis (TIA) Study concluded
• Identifies lane requirements, traffic control
  measures, signals
  
• Work session August 11, 2006 resolved remaining
  ADOT County issues
  
• Hydrology Study completed
• Includes Channel that takes 200 acres out of
  flood plain provides for linear park
  
• with multi-use path
• Working partnership with County to update FEMA
  floodplain maps

• Adequate Water Supply Study concluded
• Northern Sunrise Water Company to secure
  designation for water adequacy

10
Summary

• Recommend approval
• Water Budget Compliance achieved
• Consistent with previous approved rezonings and
  meets all criteria in
  
• Babocomari Area Plan adopted by Board of
  Supervisors on
  
• September 6, 2005.
• County conditions provide checks and balances
  during subdivision
  
• plat approval process.
• Rezoning allows opportunity for better
• Roads
• Water service and water conservation
• Utilities
• Tax base and quality of life

11
Questions?
12
BU 1 Water Conservation/Off-set Measures

• Septic System Incidental Recharge
• (Still controversial due to ADWR/ADEQ
  conflicts potential off-set of 1,868 GPD _at_ 32
  of water entering septic
  
• system)
• Mesquite Tree Removal
• Distribution of Water-Wise Info
• (Lack of study data makes conclusions
  fallible)
  
• Building Envelopes limited to 15,000 sf/lot
• Turf limitations/Low-water use plants
• (Preliminary data indicates exterior water
  savings of 42)
  
• Low-flow Water Fixtures (Applicable to current
  zoning proposed rezoning)
  
• Hot Water Recirculating Systems (Applicable to
  proposed rezoning only)
  
• Air Conditioning in lieu of Evaporative Coolers
  (Applicable to proposed rezoning only)
  
• Storm water Detention Basins (Applicable to
  proposed rezoning only)
  

13
BU 2 Water Conservation/Off-set Measures
Low-Flow Water Fixtures

• Data from Western Resources
• Advocate study Smart Water A
• Comparative Study of Urban Water
• Use Across the Southwest ,
• December 2003
• Study shows 40.5 GPDPH water
• savings by using low-flow fixtures
• (16.2 GPCD x 2.5 persons/home)
• conservative number used is 50,
• or 20 GPDPH
• If project built _at_ current zoning
• 11 homes x 20 220 GPDPH
• With approved rezoning
• 44 homes x 20 880 GPDPH
• Net Offset

14
BU 3 Water Conservation/Off-set Measures
Low-Cost, Low-Flow Water Fixtures (Home Depot)
15
BU 4 Water Conservation/Off-set Measures
Hot Water Recirculating Systems

• Data from Oak Ridge National
• Laboratory Study Water Energy
• Savings using Demand Hot Water
• Recirculating Systems in Residential
• Homes, October 2002
• Study shows 25 GPDPH water
• savings by using hot water recirculating
• systems
• With approved rezoning
• 44 homes x 25 1,100 GPDPH
• Net Offset 1,100 GPDPH

16
BU 5 Water Conservation/Off-set Measures
AC in lieu of Evaporative Coolers

• Data from University of Arizona
• Cooperative Extension Study
• Evaporative Cooler Water Use, May 1994
• Study shows evaporative cooler water
• consumption range between 96 GPDPH to
• 16 GPDPH
• Babocomari property owners shall use Air
• Conditioning Systems in lieu of
• Evaporative Coolers for cooling home
• Conservative number of 16 GPDPH water
• off-set by using Air Conditioning Systems
• With approved rezoning
• 44 homes x 16 704 GPDPH
• Net Offset 704 GPDPH

17
BU 6 Water Conservation/Off-set Measures
Storm Water Detention Basins

• Data from Southwest Hydrology article
  Predicting Groundwater Recharge Rates in
  Urbanized Watersheds, July/August 2004
  
• Article shows that pre-development
• recharge rates ranged from 0.005 - 0.015 of
• annual precipitation for unimproved wash
• Conservative number of .025 recharge rate
• used to approximate increased recharge
• capability of improved detention basin
• over unimproved wash
• Annual precipitation 16.1 inches/year, or
• 1.342 feet x 44 acres 59.05 acre-feet x
• 325,851 gal/af 19,241,501 gal/year 365
• days 52,716 x .025 recharge
• Net Offset 1,318 GPD

18
BU 7 Water Conservation/Off-set Measures
Northern Sunrise Water Rates

• Data from various studies in Colorado,
• New Mexico and California have shown a
• positive correlation between increasing
• block rate price structures and decreased
• water consumption
• Whetstone Water Improvement District
• (WWID) off-set based on higher rates as
• basis for decreased consumption of 70 GPDPH
• Northern Sunrise Water Company rates
• will be 9 - 22 higher than WWID
• If project built _at_ current zoning
• 11 homes x 70 770 GPD
• With approved rezoning
• 44 homes x 70 3080 GPD

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BU 8 Water Company Update
NSWC Application for CCN APPROVED June 29, 2006,
Document Control No. 0000056636
Rates Approved in NSWC Application for CCN APPR
OVED June 29, 2006, Document Control No.
0000056636
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BU 9 Water Company Rate Comparisons
82 GPCD (Note 2)
174 GPCD (Note 3)
122 GPCD (Note 3)

• Notes
• All consumption rates per 1,000 gallons used per
  month.
  
• Per WWID letter dated 9/29/05.
• Per ADWR Upper San Pedro AMA Review Report,
  Appendix K-1, Mar 2005
  
• NSWC rates increase 42 for usage over 10,001
  gallons per month

21
BU 10 Representative Monthly Water Bill
Comparisons

• Italicized figures in parenthesis (6.25)
  indicate cost per 1,000 gallons
  
• Strong correlation between higher rates and
  lower consumption
  
• Northern Sunrise rates 9 - 22 higher than
  Whetstone Water Improvement District
  
• Data supports continued use of off-sets for
  Babocomari Area Plan developments