PZC Packet 040511Memorandum
To: Planning and Zoning Commission
From: Matt Pielsticker, Planner II
Thru: Sally Vecchio, Director of Community Development
Date: March 31, 2011
Re: Walking Mountains On-site Review of Material and Color Applications and
Roof -Mounted Solar Panels
Summary
The Final Design for the Walking Mountains Natural Science School (Mountain Discovery Center &
Field Studies Base Camp Building) was approved by the Planning and Zoning Commission on March
2, 2010. The following conditions were made a part of that approval:
1. During construction, a mock-up shall be provided onsite for the Planning and
Zoning Commission's review to ensure the acceptability of the proposed materials
and colors;
2. The applicant must receive approval for the solar panels from the Commission
prior to installation;
3. The limits of construction related disturbance must be shown in relation to the
stream setbacks near the Mountain Discovery Center (MDC), and other such
buildings, must be revised and submitted to staff for review upon submitting for a
building permit; and,
4. The proposed boardwalk materials will be reviewed and approved by the
Commission prior to construction of the proposed boardwalks.
The purpose of the site tour is to fulfill conditions #1, #2, and #4 concerning the proposed materials
and colors, and the roof -mounted solar panel design and placement, and boardwalk material.
Condition #3 was satisfied at building permit.
1. Roof Mounted Solar Panels. The applicant is proposing to install roof -mounted solar panels
on the south facing roof planes of each building. The panels are proposed to be installed
parallel to the rooflines and do not break the ridgelines of the roof to which they are mounted.
Staff finds that the installation of the roof -mounted solar panels is consistent with Sec.
7.28.100(g) Alternative Energy System Standards of the Avon Development Code. Attached to
this memorandum are documents related to the photovoltaic array design of the solar panels
(Exhibit B).
2. Color and Material. The colors and materials have been installed on the buildings as approved by
the PZC with one exception. The cementitious panels painted to match the window cladding have
been replaced with cement stucco to match the window cladding. This material is adjacent to and
between windows on each building (see photograph on pg 5). This material was changed during
construction due to concerns with the long-term durability of approved hardi-board material, as well
as the inability to obtain the product in this region.
3. Boardwalk Material. The proposed boardwalk material will be presented at the site -tour to satisfy
condition #4 of approval.
Page 1
Policy Review
The following Development Code standards apply to the review of materials and colors, and
solar energy systems.
Materials and Color Standards:
Sec. 7.28.0906) Mixed -Use and Non -Residential Design Standards
(4)Building Layout and Design
(viii) Building Materials. The means and methods of construction of new
buildings should contribute to their durability, usefulness, and compatibility. In
addition to the general requirements of §7.28.090(c)(3), the following regulations
shall apply to exterior walls on mixed-use and non-residential structures.
(A) Durability of Materials. Materials should be used that have a long life
and age well. Materials at the ground floor should be composed and
detailed in a manner that enriches the pedestrian experience. Authentic
materials are encouraged. Faux or fake materials are prohibited. New
materials, such as architectural composite panels, should not imitate
other materials, but should reflect their own identity.
(B) Masonry and stone veneer. Masonry and stone veneer walls should
be detailed as masonry bearing walls, especially at corners and windows
and door openings.
(C) Synthetic materials. The use of synthetic materials is discouraged
unless they can be shown to display the ability to age in a manner similar
to or superior to the natural materials they replace.
(D) Trim and molding. Building walls should be trimmed in wood, stone,
cast stone, precast concrete, or concrete. Foam moldings are
discouraged.
(E) Multiple materials. Two (2) or more wall materials may be combined
on one (1) fagade, but should be located one above the other with lighter
materials above more substantial materials (e.g. wood above stucco or
masonry, or stucco above masonry).
(F) Color. Materials and finishes should be composed to provide balanced
designs that are appropriate to each style and context. In general, large
areas of bright colors should be avoided, although strong accent colors
can be successfully used.
Solar Panel Standards:
Sec. 7.28.100(g) Alternative Energy System Standards
(3) Roof -Mounted Solar Collection Systems
(i) Standards. All roof -mounted solar collection systems shall comply with
the following requirements:
(A) Setbacks, Location, and Height
(1) A roof -mounted solar collection system shall not extend more
than two (2) feet above a pitched roof or six (6) feet above a flat
roof.
(2) With the exception of flat roofs, a roof -mounted solar collection
system placed on the roof shall mimic the roof pitch it is attached
to.
(3) A roof -mounted solar collection system may be located on an
April 4, 2011 PZC Meeting Page 2
accessory structure.
(4) A development proposed to have a roof -mounted solar
collection system located on the roof or attached to a structure, or
an application to establish a system on an existing structure, shall
provide a structural certification as part of the building permit
application.
Exhibit
A. Photographs of Buildings Showing Color and Material Installations.
B: Letter from Applicant, three-dimensional views, and photovoltaic specifications
April 4, 2011 PZC Meeting Page 3
EXHIBIT A
Beetle -Kill Wood Siding and Window
Zinc colored metal roofing and flashing
April 4, 2011 PZC Meeting Page 4
EXHIBIT A
Corner stucco detail
April 4, 2011 PZC Meeting Page 5
Exhibit B
SANTA BARBARA Z E H R E N V A 1 L
(805)963-6890 FAX (805)963-8102 (970)949-0257 FAX (970)949-1080
santabarbera @a zehren.com AND ASSOCIATES, INC. v a , D z e h r r n. c o n,
ARCHITECTURE • PLANNIN[ - INTERIORS
September 2, 2010
Mr. Matt Gennett
Planning Manager
Town of Avon Community Development
1 Lake Street
Avon, Colorado 81620
RE: Walking Mountains Photovoltaic Array Design — Condition of Final
Design Approval number two
Dear Matt:
The attached documents are hereby submitted to satisfy the Walking Mountains
(formerly Gore Range Natural Science School) Final Design Condition two.
Included are two three dimensional model views of the proposed photovoltaic
arrays to be located on the Mountain Discover Center (MDC) and Field Studies
Base Camp (FSBC) buildings. Also included are sheets A1.1.3, A2.1.1 and
A2.1.3 from the final construction document set. These pages show the panels
on the roof in roof plan and elevation. Finally we have also attached a cut sheet
for the actual solar PV panel that will be used.
Please let us know if you require any additional information for your review.
Sincerely,
Brian Sipes, AIA, LEED AP
Principal
Exhibit B
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SCALE: AS SHOWN
LS250 LUM CW
LS250Monocrystalline Photovoltaic Module
Uniform performance and stability under a range of light conditions
Applications Features
On -grid Residential systems 60 mono crystalline CSUN Selective Emmitter Solar Cells
On -grid Commercial Systems 18.25% cell efficiency
On -grid Utility systems Performance deviation of +/- 3%
Low degradation under high irradiance conditions
Low cell mismatch rate
Anodized aluminum alloy frame, black or clear
LmwUMC3!Fa
Electrical Specifications
Model
......................................................................:.........................................
LS 250 - 60M
Rated Power @ STC
......................................................................:.........................................
250 W
CEC Power @ PTC
...................... ................................................
226.6 W
:.........................................
Nominal Voltage
......................................................................:..................
24 V
I ......................
Open Circuit Voltage (Voc)
.................... ..................................................
37.30 V
:.........................................
Short Circuit Current (Isc)
........................................................................:.........................................
8.78 A
Peak Power Voltage (Vmp)
................... ............................................... ....:.........................................
30.10 V
Maximum Power Current (Imp)
...............................................................................................................
8.31 A
Operating Temperature
......................................................................:.........................................
-40 °C to 85 °C
Max System Voltage (UL / IEC)
................... ................... ................................
600 V / 1000 V
:.........................................
Max Series Fuse Rating
.......................................................... ............
20A
:............... ..........................
Power Tolerance
......................................................................:.........................................
t3%
Cell Efficiency
......................................................................:.........................................
18.25%
Power Density
14.30 W/ft2
Mechanical Specifications
note. m (mm/
Solar Cell
.......................................................................:.............................................................................................................................................................................
Mono-crystaline 6" x 6" (156mm x 156mm)
Number of cells
.......................................................................:.............................................................................................................................................................................
60 (6 x 10)
Internal Bypass Diodes
.......................................................................:.............................................................................................................................................................................
6
Module Dimensions
.....................................................................................................................................................................................................................................................
64.54" x 38.98" x 1.97' (1640mm x 990mm x 50mm)
Module Area
.................................... ...................................:.................................................................................................
17.48 ft2 (1.62 m2)
-- ........................................................................
Module Weight
..........................................................--.........:.........................................................................................................................--................................................
43.65 lbs (19.8 kg)
Front Glass
.......................................................................:.............................................................................................................................................................................
.13" (3.2mm) tempered glass
Cell Encapsulation
........................................................................
EVA (Ethylene-Vinyl-Acetate)..
:....................................................... ........... ................. ......... .............................................. .............. ............. ......
Frame
.......................................................................
Anodized Black / Clear Aluminium Alloy
..............................................................................................................................................................................
Output Cables
.....................................................................................................................................................................................................................................................
12 Awg. 35.4" (900 mm) MC4 Connectors
Static Load
113 PSF (5400 Pa)
Hail
..................... ........................................ ..........:...............................
Maximum Diameter 1" (25mm) at 52 mph (23 m/s)
............ ..................................................................................................................................
Warranty
...................... - —............ ................................
10 years at 90% of the rated power output, 25 years at 80% of the rated power output
:..................... ............................................................ ............. ......... ....................................................... ...............
Certifications
Safety Class II, CE, UL 1703, IEC 61215, IEC 61730-1/2
Temperature Coefficients
9
Nominal Operating Cell Temperature (NOCT)
.............................................. ......... ......... --..................
113 of (45 °C)
--...........................
8
Temperature Coefficient of Pmp
...................................................................................:..................................
-0.423 % / °C
7
Temperature Coefficient of Voc
...................................................................................
-0.115 V / °C
..................................
H 6
a
Temperature Coefficient of Isc
3.424 mA / °C
a 5
e
U 4
3
2
1
C E 0:..
250
-222
-194
-167
-139 3
oo
-111
-83
-56
-28
0 5 10 15 20 25 30 35 40 45 0
Voltage (V)
Rev 3/2010