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Sterling Madison Lofquist, Inc.
titrufiarr�el n fr,rt'r7,rr £erg+na c`rs
5224 Sorrth 91", Street, Phoenix, Arizona 85040
tel. (602) 438-2500 fax: (602.) 438-2505 tit #291316 www-smieng,corn
lronRidge June 3, 2016
1495 Zephyr Ave Page 1 of 51
1 layward. CA 94544
Attn, Mr. Cares' Geiger, VP New Markets, lronRidge Inc.
Subject: Ground Mounting :System — Structural Analysis — 4 Module
Clear Sir:
We have analy7.ed the subject ground mounted structure and determined that it is in compliance with the
applicable sections of the following Reference Documents -
Codes: ASCE:/SEI i-10 Min. Design Loads for Buildings & Other Structures
California Building Cade, 2016 Edition
Other: AC428, Acceptance Criteria for Modular Framing Systems Used to Support PV
IN -I ndules, dated Effective November 1, 2012 by [CC -ES
Aluminum Design Manual, 2015 Edition
1rnnRidge Exhibit ESC -0001
The structure is a simple column (pier) and beam (crass pipe) system. The piers & crass pipes are
ASTM A53 Grade B standard weight (schedule 40) steel pipes or Allied Mechanical Tubing.. please
refer to Exhibit IBX -00.01 for approved pipe geometry and material properties. The taps of the piers are
connected in the E -W direction by the crass pipes which cantilever oyer and extend past the end piers.
The cross pipes are connected by proprietary IronlRidge XR1000 Rails spanning up and down the slope
which cantilever over and extend past the top and bottom crass pipes. Thea are typically two rails per
column of modules. The modules are clamped to the rails by the lroa Ridge Module Mounting Clamps
as shown in the: attached Exhibit.
Gravity loads are transferred to the piers and foundations by the rails and cross pipes acting as simple
beams. For lateral loads the system is either a cantilever structure or, when diagonal braces are
provided, a braced frame. The ei!i'`ect of seismic loads (for .all design categories A -F) have ken
determined to be less than the effect due to "-Ind loads in all load conditions and combinations -
The pier spacing in the N -S direction is 7'-6'7. The pier spacing, in the E -W direction is selected from
load tables dclermined by the structural design for the specified slope. wind load, and snore load. The
goveming criteria for the pier spacing is either the spanning capacity ofthe cross pipes or the cantilever
capacity of the pier. Simplified Load "Cables I A_F & ?A -F are included herein for reference.
More ,comprehensive information covering all load combinations is available at the lronRidge website,
Iron[Ridge,com.
Sra rl;rig Madison L4fquist, Inc. Consulting Structural atod Forensic Engineers
IronRidge
ivlr, Carey Geiger
Groundoranting System Structural Analysis — 4 Module
Jure 3, 2016
Page 51 of 51
ldotes for Fables 3 & 4:
1. Concrete Weight = 14 pcf 1 f c i 2500 psi
2. Skin Friction per 2016 CBC 1810.3.3.1.4 & 5
3. `Fop V -V ofsoil neglected for Skin Friction
4. Snow Load = 0 psf— tabulated values are conservative for Snow Loads > 0 psf
5. * indicates special foundation required. Contact TronRidge
.6. Resistance to corrosion and/or sulfate attach, along with possible adverse effects due toexpansive
soils has not been considered in these foundation recommendations. S1v1L Engineers assumes no
li abi ] ity with regard to these items.
i. Sail classification is to be determined and verified by the end user oftWs certification letter.
The analysis assumes that the array, including the connections and associated hardware, are installed in
a workmanlike manner in accordance with the IronRidge Ground Mount Installation Manual and
generally accepted standards of construction practice. Verification of PV Module capacity to support
the loads associated with the given =ay shall be the responsibility of the Contractor or Ovaner and not
lronRidge or Starling Madison Lofquist.
Please feel free to contact me at your convenience if you have any questions.
Respectfully yours,
Tres Varner, P.E.
Design Division Manager
C
Starling Madison Lofquist, Inc. Conuutting Straetural and Forensic Engineers
-51-
GROUND MOUNT
%%� IRONRIDGE
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Project Details
Nsrne
Ham3i-183352
p ate
12 l CL201 S
Locution
Southlake. TX, 76092
ASCE code
7-10
Total modules
40
Piers
10
Modu;e
MimiDnSolar E-nergy.M,5E375aS � m)
Qoncrsie
2.33yd-
Dimensions
7.023' x 39-33' x 1-57' •[1987-UMM x 9,99 -Oren x 40,)mm)
Wind imposure
a
Total mtt;5
15,OOG kw
'Wind spated
100 Fvh
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20 psl
�vbstrucfure& Foundation
Tii1
2-5 Pipe tut ing Iiia titer
3'
S12H'Class
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Last updated by ethlan carnpos on 1 C+15119 07:58 AM Wage 1 of 5
Hamar -183352 (,#5403671
IAS 1RONRIDGE
28M.71 ouSTRIALBLVD_ H.AYWARD CA, 94545
ground fused
Sub array #1
ROWS
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Talel srauth PieFG
516411,
Total north piers
518,10-)
7olal crass pipes
2 (.657 6'y
Total pipe length
202,
Shear
920Ib5
Moment
"02tt4b5
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14'2'
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Last updated by ethan aarnpos on 10115? 19 07=58 AM Page 2 of 5
H amalr-183332 4W36711
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28357 INDUSTRIAL RI.V[%.,. HAYWARd. [�A 94545
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Last updated by ethan carnpos on 10/15+19 07:58 AM Page 3 of 5
PAIL
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Last updated by ethan carnpos on 10/15+19 07:58 AM Page 3 of 5
SLEEVE
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Hamar -183352
Crmunding Clagram
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28357 INDUSTRIAL BLVD_ HnrWARD. CA 94545
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Hamar -183352 /,� IRON RIDGE
26357 INDUSTRIAL BLVD-- HAYWARD- CA 94545
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