HomeMy WebLinkAboutWPO202000017 Calculations 2020-07-20Project Information:
46 1161*
Project Name: Proffit Road Townhomes South
StormTecF�-
Location: Charlottesville
7.9.20
Date: 7.9.20
OelanNon-RelmNdl-Rec/,arpe
Subsurface Stormwater Management`"
Engineer: Skimp
StormTeCh RPM: JMC
MC-4500 Site Calculator
System Requirements
System Sizing
Units
Number of Chambers Required
83 each
Required Storage Volume
CF
Number of End Caps Required
10 each
Slone Porosity (Industry Standard = 40%)
40
%
Bed Size (including perimeter stone)
3,434 square feel
Stone Above Chambers (12 inch min.)
12
inches
Stone Required (including perimeter stone)
734 tons
Stone Foundation Depth (9 inch min.)
9
inches
Volume of Excavation
986 cubic yards
Average Cover over Chambers (24 inch min.)
24
inches
Non -woven Filter Fabric Required (20% Safety Factor)
1136 square yards
Bed size controlled by WIDTH or LENGTH?
LENGTH
Length of Isolator Row
75.5 feet
Limiting WIDTH or LENGTH dimension
75
feet
Woven Isolator Row Fabric (20% Safety Factor)
207 square yards
Storage Volume per Chamber
162.6
CIF
Storage Volume per End Cap
108.6
CIF
Installed Storage Volume
14,582 Cubic feet
Controlled by Length
Maximum Length =
75
feet
zo' Za
(2.13 m) (610.m)
MAX. MIN.
24
inches
_
4 rows of 17 chambers
F 12
1 row of 15 chambers
inches
Maximum Length =
Maximum Width =
75.5
46.7
feet
feet
AAA
/ 1�;(1524mm)
B0
9
inches
10m (2540 rum)
System Cost*
Quantity
Cost/Item
Total
Chambers each
83
$525.00
per chamber
$43,575.00
$300.00
End Caps each
10
per end cap
$3,000.00
$2.00
Non -woven Filter Fabric square yards 1136
per unit area
$2,271.34
Woven Filter Fabric square yards
207
$2.00
per unit area
$414.98
Manifold — estimate % of chamber cost
------
15%
of chamber cost
$6,536.25
Subtotal
$55,797.56
Other Contractor Costs*
Quantity
Cost/Item
Total
Stone tons
734
$25.00 per unit volume
$18,351.49
Excavation Cost cubic yards
986
1
$15.00 per unit volume
$14,784.69
Inlet/Outlet structures number of structures
2
$5,000. per structure
$10,000.00
Subtotal
$43,136.18
Total Material Cost
$98,933.75
Cost per cubic foot
$6.82
'This represents the estimated material and site work costs (US dollars) for
the project. Materials excluded from this estimate are conveyance pipe, pavement
design, etc. It is sways advisable to seek detailed construction costs from
local installers. Please contact STORMTECH at 888-892-2694 for additional cost
information.