APPROVED FIR RESUB 5-BLD2022-1556+Fire Analysis Stormkeeper Detention Chambers+8.26.2024_3.23.41_PM+4463189E
August 26, 2024
via email
cburt@southsnofire.org
Chris Burt, Deputy Fire Marshall
Fire Prevention Services
12425 Meridian Ave. S
Everett, WA 98208
275 Grandview Ave.
BLD2022-1556 Suite 300
Camp Hill, PA 17011
www.lane-enterprises.com
717.761 •8175
Fax 717. 761 • 5055
Re: Glacier Environmental, 7509 212t' Street SW, Edmonds, WA
Dear Mr. Burt:
RESUB
Approved Aug 27 2024
DFM Chris Burt
South County Fire oe es
Date: 08/27/2024
08-27-2024
RESUB 5 CIVIL PLAN REVIEW
NOTES: APPROVED WITH CONDITION.
1. CIVIL PLANS, C4.21 CROSS SECTIOP
DETAILS AND NOTES, STATES 18
INCHES MINIMUM COVER. THE LETTEI
SUBMITTED FROM LANE
ENTERPRISES WRITTEN ON 08-26-202.
STATES 21 INCHES MINIMUM COVER.
MINIMUM COVER SHALL BE 21 INCHE:
DFM BURT
Pursuant to your August 8, 2024 review comments, we have performed (2) finite element
analyses (FEA) of the SK75 chamber system for the following loading conditions at a
minimum cover of 21 inches:
HS-25 Highway Truck
40,000 pound single -axle
20,000 pound 10"x 20" wheel loads
72-inch center -to -center wheel spacing
Fire Truck Outrigger
43,000 pounds
24"x24" outrigger distribution area
16-ft center -to -center outrigger loads
The analyses were performed using CANDE (Culvert Analysis and Design), a finite element
program developed by the Federal Highway Administration. The analyses were evaluated in
accordance with the design criteria outlined in ASTM F2787 and Section 12 of the AASHTO
LRFD Bridge Design Specifications (as modified for chambers per ASTM F2418). We note that
at 21 inches of cover there is no interaction between adjacent wheels or outrigger loads.
New York
Please let this letter and following pages serve to certify that the SK75 chambers are fully
Ballston Spa
capable of meeting the above -described loading conditions using standard installation
Bath
parameters per the SK75 Installation Guide.
North Carolina
Statesville
The analyses assume that (1) the pavement is constructed to support these loads and (2)
the system subgrade has sufficient bearing capacity.
Pennsylvania
Bedford
If there are any other questions regarding this matter, please contact me at 717-599-8862.
Carlisle
King of Prussia
Pulaski
Shippensburg
Very truly yours,
Texas
Temple
Virginia
y`
Bealeton erome S. Silagyi, P.E.
Dublin Chief Engineer
Wytheville
ESOP p PLASTICS
Florida PIPE
Alachua INSTITUTE'
LANE Metal Products Division • LANE Plastic Pipe Division • LANE Fabricators Division • LANE Technical Coatings Division
GLACIER ENVIRONMENTAL, 7509 212T" STREET SW, EDMONDS, WA
CTnDNAVrCDCD CV71: CTnDNA\A/ATCD rUAKADCD CVCTCKA ECA
Figure 1. HS-25 load centered on center chamber (modeled by the five red shaded round shapes).
LRFD STRENGTH-LIN.IT RATIC•S AT STEP 6, FOR PLASTIC GROUP # 1
:)ESIGN-CRITERION
CCNTRCL
FACTORED
FACTORED
RATIO
NCDE
DEY-AND
CAPACITY
IPALUE
NxTERIAL THRUST
(psi)
33
-1690W.74
3100.00
0.540w
GLOBAL BUCF{LING
(psi)
33
-169ow.74
290w°.14
0.560w
COMBINED STRAIN
(in/in)
20
-0.01144
0.06000
0.191
LRFD SERVICE LG --, PERFORNlidCE AT STEP c, FOR PLASTIC GROUP # 1
N1,XIMUN_-TENSILE STRAIN (in/in).................... 0.003512
RATIO N-,X-TENSILE TC ALLC-WABLE.STRAIN ............ 0.07
PERCENT VERTICAL DEFLECTION ($)................... 1.29
RATIO C•F VERTICAL DEFLECTICii TO ALLOWABLE ........ 0.52
HS-25 CANDE ANALYSIS Attachment to Lane Letter Dated 08/26/2024
GLACIER ENVIRONMENTAL, 7509 212T" STREET SW, EDMONDS, WA
CTnonnvrCDCD CV7C CTnDKA\A/ATCD rUAKADCD CVCTrnn CCA
Figure 1. Fire truck outrigger load centered on center chamber (modeled by the eleven red shaded
round shapes).
LRFD STRENGTH -LIMIT R ATIC'S
AT STEP c,
FGR PLASTIC
GROUP # 1
DESIGN -CRITERION
C-32TTROL
FACTORED
FACTORED
RATIO
NODE
DEMAND
CAPACITY
VALUE
MATERIAL THRUST (psi)
34
-1723.23
3100.00
0.556
GLOBAL BUCKLING (psi)
34
-1723.23
290W6.76
0.577
DY-BINED STRAIN (in/in)
33
-0.01143
0.06000
0.190
LRFD SERVICE LOAD PERFORMANCE AT STEP 6, FOR PLASTIC GROUP # 1
MAXIMUM -TENSILE STRAIN (in/in).................... 0.004042
RATIO YAK -TENSILE TC ALLOWABLE.STRAIN ............ 0.08
PERCENT �,ERTICAL DEFLECTION (%)................... 1.61
RATIO CF TJERTI A.L DEFLECTION TO ALLC-wABLE ........ 0.64
FIRE TRUCK OUTRIGGER CANDE ANALYSIS Attachment to Lane Letter Dated 08/26/2024