Read ESLO Elements Table_7-18-09.xls text version

y Environmentally Sensitive Lands Ordinance Definitions and Criteria

Informational Note: The following information represents updated standards and definitions for each of the environmentally sensitive resources to be addressed by the ESLO. Acknowledging existing Town of Oro Valley adopted codes, these definitions include additional detail and updaed information based on extensive input by the ESLO Technical Advisory Committee. This science-based Committee worked with the ESLO consulting team's biologists from RECON to draft defintions based on most current best practices and procedures and the best available information. For example, additional specificity regarding significant vegetation and riparian areas has been added to address acknowledged deficiencies in existing Town codes and procedures. The table also includes references to adopted General Plan policies that provide direction in determining resources to be protected. The General Plan text and maps are available online at the Town's webpage at http://www.orovalleyaz.gov/Assets/_assets/pz/pdf/GeneralPlan+061505+final.pdf

Existing General Plan or Zoning Code Language Resource Value Proposed Definition or Criteria General Plan Policy Reference Reference

1.0

Wildlife Habitat - General Plan lists areas 'occupied by specialstatus species' and partnership in implementing SDCP

Wildlife habitat will include all areas identifed as Significant Vegetation, Significant Rock Outcrops, Riparian Areass, or Wildlife Linkages.Wildlife habitat areas will also include: 1) Locations of special-status wildlife species report to AGFD HDMS 2) Pima County Conservation Land System Biological Core, Multiple Use Management Areas, and Important Riparian Areas 3) Nature Conservancy Conservation Target #18 (Tortolita Mountains) Breeding, foraging, cover, and dispersal habitat for common and 4) Priority Conservation Areas for PVS 5) Perennial or intermittent springs special-status wildlife 6) Cave, crevice, or mine shaft with a minimum cavity area of 220 cubic feet (approx 6' x 6' x6') 7) Designated Critical Habitat for ESA T&E species 8) AGFD Areas of Conservation Priorities; Species of Greatest Conservation Need; Socially & Economically Significant species. *Special-status species = SDCP Priority Vulnerable Spp. (PVS), AZ WFSC, and ESA T&E

11.2.1 11.2.3 11.2.5

Pima County SDCP, Nature Conservancy Ecoregion Assessments, Town of Marana HCP, Pinal County Open Space Plan, USGS Cave Ecology

2.0

3-Tiered Linkage: 1) AZ Wildlife Linkages Assessment (Santa Catalina-Tortolita Mountains Linkage) as backbone 2) Riparian Areas as connections across NOS, Town of Oro Valley, Arroyo Grande, and Provides for dispersal, migration, undeveloped lands in Pinal County Wildlife Linkages - Concept referenced in TOV Code Section 27.4 and genetic transfer for wildife 3) Upland linkages between Wildlife Habitat to Riparian Areass or directly to NOS and plants 4) Connection to Marana HCP linkages if appropriate 5) RTA Wildlife Linkages 4) Consider linkages to Pinal County Open Space #9 and Regional Park #7 as appropriate

11.2.9 11.2.11 AG-3

Beier et al. 2006. AZ Missing Linkages, Tucson-Tortolita-Santa Cataline Mountains Linkage Design. NAU School of Forestry, Pinal County Open Space and Trails Master Plan, Town of Marana HCP, Pima County SDCP

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TAC Meeting April 16, 2009

1

y Environmentally Sensitive Lands Ordinance Definitions and Criteria

Informational Note: The following information represents updated standards and definitions for each of the environmentally sensitive resources to be addressed by the ESLO. Acknowledging existing Town of Oro Valley adopted codes, these definitions include additional detail and updaed information based on extensive input by the ESLO Technical Advisory Committee. This science-based Committee worked with the ESLO consulting team's biologists from RECON to draft defintions based on most current best practices and procedures and the best available information. For example, additional specificity regarding significant vegetation and riparian areas has been added to address acknowledged deficiencies in existing Town codes and procedures. The table also includes references to adopted General Plan policies that provide direction in determining resources to be protected. The General Plan text and maps are available online at the Town's webpage at http://www.orovalleyaz.gov/Assets/_assets/pz/pdf/GeneralPlan+061505+final.pdf

Existing General Plan or Zoning Code Language Resource Value Proposed Definition or Criteria General Plan Policy Reference Reference

Revise and expand definitions: 1) Hydroriparian - any drainage with perennial surface water regardless of plant species composition 2) Mesoriparian - any drainage without perennial surface water but any of the following species: Arizona Walnut (Juglans major), Fremont cottonwood (Populus fremontii), Gooding willow (Salix gooddingii), Arizona sycamore (Platanus wrightii), Arizona ash (Fraxinus velutina), netleaf hackberry (Celtis reticulata), or seep willow (Baccharis salicifolia) 3) Xeroriparian - any drainage not meeting above standard but with representative vegetation volume 0.500 m3/m2 or greater - OR IF VEG VOLUME IS LESS - Storm flow magnitude of 50 cfs or greater for a 100-year event 3.1) High Xeroriparian A - Generally associated with well-developed riparian areas. The trees present are generally 16 feet to 20 feet tall or taller. The vegetative volume per unit area within this habitat type is approximately 0.850 M3/M2 with much of the volume present within the dense over-story. The diversity of species is relatively greater than that associated with Intermediate Xeroriparian B and Low Riparian C Areas. Mesquite, Desert Willow, Blue Palo Verde, and Desert Hackberry are representative tree species within High Xeroriparian A Habitat areas. 3.2) Intermediate Xeroriparian B -Typically occur along well-developed riparian areas. The principal distinction between Xeroriparian A and Xeroriparian B Habitats is that of plant size (height, trunk size, and total vegetative volume). Trees in this habitat type generally range from 6 feet to 15 feet tall. The under-story is often more extensive than Xeroriparian A Habitats due to a more open over-story canopy. Within Intermediate Xeroriparian B Habitats, the vegetative volume per unit area is typically 0.675 M3/M2. Mesquite, Ironwood, Blue Palo Verde, Catclaw Acacia, Desert Broom, and Desert Hackberry are representative of this habitat type.

Existing definitions for Riparian Habitat Chapter 31 (definitions);.

3.0

Riparian Areass - TOV Code Section 24.7 Riparian Habitat Overlay District: Defines riparian habitats based on likely species composition, general density/size, and vegetation volume

Wildlife habitat, nutrient cycling, erosion control, water quality, 3.3) Low Xeroriparian C - Typically occur along minor Riparian Areass and along the peripheral edges of major Riparian flood moderation Areass. The typical vegetative volume per unit area in this habitat type is between 0.500 and 0.675 M3/M2. Whitethorn Acacia, Catclaw Acacia, Desert Creosote Bush, Bunchgrasses, and Bursage are typically found within Low Xeroriparian C Habitats. 4) Vegetation volume will be determined using Pima County protocol (under development) CRITERIA FOR DETERMINING BOUNDARIES: 1) If Hydroriparian, Mesoriparian, or Xeroriparian (> 0.500 m3/m2): A contiguous line along the canopy margins of the predominant overstory vegetation species parallel to a riparian area, where the lateral distance between canopy margins of individuals of the predominant plant species is less than two times the height of the tallest individuals. Where the distance between canopy margins parallel to the channel are greater than two times the height of the tallest individuals, the boundary will be the top of bank of the channel. Where no top of bank is apparent, the 10-year flow event shall be used 2) Boundary between Meso and Xeroriparian habitat types - any gap between Mesoriparian indicator species of 1,000 ft or greater will indicate a transition to xeroriparian. Mesoriparian boundary will be at indicator species' canopy 3) In braided riparian systems where 'islands' may occur, these shall be included as part of the riparian area. The boundaries of parallel riparian areas separated by 200 ft or less shall be merged. 4) If Xeroriparian (< 0.500 m3/m2) with storm flow of 50 cfs or greater, the boundary will be the top of bank or the 10 year flow event where there is no discernable top of bank Criteria for determining upstream starting point of Riparian Areas (headwaters): 1) Where storm flow is 50 cfs or greater for a 100-year event

11.2.3 12.1.1

1) Handbook for Developing Watershed Plans to Restore and Protect Our Waters (Draft), October 2005, EPA 841-B-05-005 2) Center for Watershed Protection Model Ordinances 3) Regional Ordinances (Pima County, Town of Marana, City of Tucson, City of Scottsdale 4) TOV Code Chapter 17 Floodplain & Erosion Hazard Mgt

Red=Removed Blue=Added

TAC Meeting April 16, 2009

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y Environmentally Sensitive Lands Ordinance Definitions and Criteria

Informational Note: The following information represents updated standards and definitions for each of the environmentally sensitive resources to be addressed by the ESLO. Acknowledging existing Town of Oro Valley adopted codes, these definitions include additional detail and updaed information based on extensive input by the ESLO Technical Advisory Committee. This science-based Committee worked with the ESLO consulting team's biologists from RECON to draft defintions based on most current best practices and procedures and the best available information. For example, additional specificity regarding significant vegetation and riparian areas has been added to address acknowledged deficiencies in existing Town codes and procedures. The table also includes references to adopted General Plan policies that provide direction in determining resources to be protected. The General Plan text and maps are available online at the Town's webpage at http://www.orovalleyaz.gov/Assets/_assets/pz/pdf/GeneralPlan+061505+final.pdf

Existing General Plan or Zoning Code Language Resource Value Proposed Definition or Criteria Significant Vegetation - Characterized as unique plant occurrences and/or unique individual specimens that demonstrate, through the presence of certain criteria, as listed below, areas of special value to the Sonoran Desert ecosystem. (Plant Communities removed) Additional Criteria: 1) Plant species that are native to the area 2) Plants are generally healthy and will survive for five (5) or more years. 3) Noxious/Invasive species are few and not visually prominent, such as desert broom, tamarisk, mexican palo verde, and tree of heaven. 4) Grading or clearing has not substantially altered the landscape in the area. 5) Constructed non-native landscapes do not qualify as significant vegetation. General Plan Policy Reference Reference

4.0

Significant Vegetation - TOV Code Section 27.4 lists Plant Communities, Unique Plant Occurrences, and Unique Plants

OVZCR Chapter 31 #301, Significant Vegetation 1) ASDM - Biological Survey of Ironwood National Mnt 2)Turner and Funicelli. 2004. Demographic changes and epidermal browning in two protected populations of saguaro cactus (Carnegiea gigantea). Desert Plants 20(1): 16 ­ 23

4.1

Unique Plant Occurrences - General description in TOV Code Section 27.4 with examples Keystone species; Important forage plant for bats and nesting structure for cavity-nesting birds Unique Plant Occurrences are areas of vegetation that exist in contrast to the majority of the surrounding vegetative community due to either microclimates or availability of water sources. and raptors Add specific definitions: 1) Significant saguro cacti stands = 80 or more saguaro of any size occuring within 1 acre. 2) Significant ironwood tree stands = 30 percent or more average cover within a 1 acre area. 3) Significant palo verde tree stands = 50 percent or more average cover within a 1 acre area. 11.2.2

4.1.1

Significant Saguaro Stands - Listed in General Plan, but no definition

4.1.2

Significant Ironwood Stands - Listed in General Plan, but no definition

Important bird habitat

4.1.3

Significant Palo Verde Stands - No current language

Important bird habitat

4.1.4

Signficant Ocotillo Stands - No current language

Important nectar source for hummingbirds

Add specific definition: Significant ocotillo stands = 50 ocotillo of any size within a 1 acre area.

Unique Plant refers to any native tree, shrub, or cacti with extraordinary characteristics such as, but not limited to age, size, shape, form, canopy cover, or aesthetic value. Expand examples and use as specific definitions: 1) Saguaro cacti over 15 ft. tall with 2 or more arms 2) Crested saguaro cacti of any size 3) Native tree with 12 in basal caliper and over 12 ft. tall 4) Native 'nurse' tree with 3 or more saguaro cacti under or within its canopy 5) Plant listed as Threatened or Endangered under ESA or Highly Safeguarded by ADA

4.2

Unique Plant - General description in TOV Code Section 27.4 with examples.

Societal and wildlife values

OVZCR Chapter 31 #301, Significant Vegetation

Red=Removed Blue=Added

TAC Meeting April 16, 2009

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y Environmentally Sensitive Lands Ordinance Definitions and Criteria

Informational Note: The following information represents updated standards and definitions for each of the environmentally sensitive resources to be addressed by the ESLO. Acknowledging existing Town of Oro Valley adopted codes, these definitions include additional detail and updaed information based on extensive input by the ESLO Technical Advisory Committee. This science-based Committee worked with the ESLO consulting team's biologists from RECON to draft defintions based on most current best practices and procedures and the best available information. For example, additional specificity regarding significant vegetation and riparian areas has been added to address acknowledged deficiencies in existing Town codes and procedures. The table also includes references to adopted General Plan policies that provide direction in determining resources to be protected. The General Plan text and maps are available online at the Town's webpage at http://www.orovalleyaz.gov/Assets/_assets/pz/pdf/GeneralPlan+061505+final.pdf

Existing General Plan or Zoning Code Language Resource Value Proposed Definition or Criteria General Plan Policy Reference Reference Goode et al. 2004. Effects of destructive collecting practices on reptiles JWM 68(2):429-434. NO SIZE GIVEN

5.0

Significant Rock Outcrops - Listed in General Plan, but no definition.

Provides habitat and thermal Add specific definition: regulation for wildlife, particularly 1) Rock or boulder pile measuring at least 100 sq. ft. in area and a minimum 3 ft. above the surrounding ground level. reptiles 2) Scottsdale specification is 20' x 25' Community visual quality

6.0

Topography- Hillside Areas

Slope stability Community visual quality

Slope catagories mapped Current Thresholds: 15%- density requirments start 25%-triggers additional open space 33%- minimal development 1/36 ac

Hillside Development Zone - TOV Code Section 24.2 1.1.2 Consistency with current code is priority. Are new thresholds needed for AG or elsewhere?

7.0

Visual Resources - General Plan guidance and TOV Code for Scenic Corridors, Peaks, and Ridges

1) Agree-upon visual resources identified- Oracle Road and Tangerine Road Scenic Corridors- visibility mapping built from DTM; building height contour line; corridor widths (TR=300'; OR=300'; visual analysis (grading, plant palette, mitigation) Visual character of the Town 2) GP scenic corridors- 300'? (includes Calle C, First, La Canada, La Cholla, Lambert, Linda Vista, Moore, Naranja, Views from parks and corridors Palisades, Rancho Vistoso, Shannon) 3) Other protected view points- public parks and all elevations above 3,200 feet- modeling needed 4) Unique plants defined above that provide aesthetic value in addition to natural resource value 5) Exposed rock face or bedrock extending 15 ft or more above surrounding ground level

1.1.4 11.3.1 11.3.2 11.4.1

Oro Valley General Plan 2005 Digital Data- Lidar, digital terrain model- TSSW

8.0

Cultural Resources - General Plan guidance and TOV Code Section 27.2 contains site analysis requirements for records check, field surveys and mapping of resources, and mitigation plans

Utilize Nation Register of Historic Places definitions and criteria supplemented as necessary to address OV conditions. Unique archaeological, historical, Historic Preservation Commission will lead the review and acceptance of definitions, criteria and conservation targets for and cultural resources cultural resources. Extensive information from the SDCP will be incorporated in the cultural resources protection approach. Surface and subsurface hydrologic resources; water supply; Linkages and connectivity of open space/habitat areas,

10.1.2 10.1.3

9.0

Floodplains

100 year flood limits for washes of atleast 50 cfs will be used to delineate the sensitive resource area.

12.1.1

Oro Valley Floodplain Management Ordinance

Red=Removed Blue=Added

TAC Meeting April 16, 2009

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