Fillable COMMERCIAL SITE PLAN REQUIREMENTS (Mobile County Commission)

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COMMERCIAL SITE PLAN REQUIREMENTS (Mobile County Commission)

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BROWSE MOBILE COUNTY COMMISSION (AL) FORMS

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Assistant County Engineer
W. Bryan Kegley II, P.E., P.L.S.
Deputy Public Works Director
Richard A. Mitchell, P.E.
Engineering Manager - Design
Kimberly N. Sanderson, P.E.
Engineering Manager - Development
Matthew D. Barclift, P.E., CFM
Engineering Manager - Construction
James Vorpahl, P.E.
Traffic Manager
James D. Foster
MOBILE COUNTY PUBLIC WORKS
Mobile Government Plaza ∙ 205 Government Street ∙ Mobile, Alabama 36644-1600
Phone: (251) 574-8595 ∙ Fax: (251) 574-4722 ∙ www.mobilecountypublicworks.net
COMMERCIAL SITE PLAN REQUIREMENTS
For LAND DISTURBANCE PERMITTING
And INTERNATIONAL BUILDING CODE COMPLIANCE (106)
These items are required for the submittal of a commercial site plan. This submittal and its
subsequent satisfactory review is required for the purpose of obtaining a building permit. This
site plan will be reviewed for its impact on the Mobile County right-of-way and adherence to
stormwater requirements within the County’s MS4 Boundary (Section 10). It is the Owner and
Design Engineer's responsibility to consider the impact on adjacent private properties. These
requirements are subject to change without notice.
1. All subdivisions associated with Commercial or Residential Development within a
municipal planning commission jurisdiction (which may reach up to five (5) miles into
the County from the City Limits) and/or Mobile County’s Jurisdiction shall be approved
by that entity before the developer submits the site plan to the Mobile County
Engineering Department for review.
2. Each site plan submittal shall include a “Certification of Professional Engineering
Design For Site Plan Approval Of A Commercial Site Plan” as obtained from the County
Engineer's Office. Said certification shall have an original signature and seal of an
Alabama Licensed Professional Engineer.
3. Three (3) copies of the site plan along with one (1) copy of the Building Construction
Plan shall be submitted for every Commercial Development requesting a Building
Permit. The one (1) copy of the building construction plans shall be submitted directly to
the office of the building inspector. Site plan drawings shall bear the original seal of an
Alabama Licensed Professional Engineer.
4. A vicinity map shall be included on the site plan. Include a legal description of property.
Provide a copy of the executed lease if site is a lease situation.
5. The site plan shall clearly indicate all accesses to County roads. Maximum driveway
width at the right-of-way is 40 feet. Minimum driveway width at the right-of-way is 20
feet and minimum distance between driveways is 20 feet. Driveways will slope away
from roads a minimum of ½ in. per ft. for a minimum of 8 feet. Storm water runoff is not
allowed to enter into the travelway. There shall be adequate cover above any driveway
pipe. Only reinforced rubber gasket concrete pipe (15" min.) or reinforced ram-neck joint
arch concrete pipe can be used within the County right-of-way. If driveways are existing
then they shall be noted as existing with radii, pipe size, length & headwalls detailed on
the site plan. All accesses to County right-of-way shall be improved to match roadway
surfacing.
S i t e P l a n R e q u i r e m e n t s f o r L a n d D i s t u r b a n c e P a g e | 2
Mobile Government Plaza ∙ 205 Government Street ∙ Mobile, Alabama 36644-1600
Phone: (251) 574-8595 ∙ Fax: (251) 574-4722 ∙ www.mobilecountypublicworks.net
6. The site plan shall provide appropriate notes, details, and methods for the prevention of
sediment laden storm water runoff or eroded materials from leaving the construction site.
A grading plan shall be provided demonstrating site layout with appropriate BMP’s
shown. Reference shall be made to the Alabama Handbook for Erosion Control,
Sediment Control and Stormwater Management on Construction Sites and Urban Areas,
Current Edition. If applicable, a copy of the NPDES permit and CBMPP shall be
submitted.
7. The site plan shall have existing and proposed contours at one (1) foot intervals. The site
plan shall have all proposed site improvements detailed as to dimensions and construction
materials. All surface materials shall be clearly identified and a weighted storm water
runoff coefficient shall be determined. Existing facilities shall be noted as Existing. Only
that portion of the property that presently drains to the County right-of-way in its pre-
development state can be drained to the right-of-way after the property is developed.
8. Pre-development and post-development drainage calculations based on 10-year, 50-year
and 100-year storms, prepared and sealed by an Alabama Licensed Professional Engineer
shall be submitted with the site plan. Outside of the County’s MS4 Boundary, if any
drainage is to be connected to a County right-of-way, a detention or retention facility will
be required to hold the increase in run-off for a 10-year storm (minimum) due to the
development. The engineer shall submit calculations insuring that the detention system
will safely pass the resulting flows of the 50-year and 100-year storms. A note should be
placed on the site plan stating which entity other than the County of Mobile is responsible
for the maintenance of the detention/retention facility.
9. The site plan shall also have all existing and proposed drainage detailed. Any required
detention or retention basin shall be detailed. The control structure and outfall shall be
profiled, and an emergency relief provided. Calculations demonstrating the storage
volume, sizing of the orifice, and discharge rate are required and shall bear the original
seal of an Alabama Licensed Professional Engineer.
10. In any watershed which contains a public drinking water source, including, but not
necessarily limited to, the J. B. Converse Watershed, or any 303(d) watershed impacted
by land development, or any property located within the Mobile County MS4 Boundary,
storm water detention facilities are required. Detention criteria shall include a maximum
release rate equivalent to the 10 year storm pre-development rate. The minimum
detention capacity shall accommodate the increase in volume for a 100 year post
development storm. The Alabama Licensed Professional Engineer must certify that the
design of the Commercial Site and its storm water detention features are designed in
accord with these Requirements. Any storm water detention facility must be shown in
the plans as an area not maintained by Mobile County or the State of Alabama.
10a. The Alabama Licensed Professional Engineer must submit a plan for maintenance of any
drainage easements and storm water detention facilities. The owner of any Commercial
Site must provide a signed acknowledgment as to who (other than Mobile County or the
State) will own and maintain any such storm water detention facilities and easements, and
such owner must covenant that the maintenance responsibility will run with the land and
is enforceable by any person or entity damaged by an owner’s failure to maintain such
facilities. Where the maintenance responsibility is vested in a property owners’
association, articles of incorporation for such property owners’ association must be
S i t e P l a n R e q u i r e m e n t s f o r L a n d D i s t u r b a n c e P a g e | 3
Mobile Government Plaza ∙ 205 Government Street ∙ Mobile, Alabama 36644-1600
Phone: (251) 574-8595 ∙ Fax: (251) 574-4722 ∙ www.mobilecountypublicworks.net
submitted to the County which must state that such association has perpetual maintenance
responsibility for any such storm water detention facilities and easements, and that such
maintenance responsibility constitutes a covenant that will run with the land and is
enforceable by any person or entity damaged by an owner’s failure to maintain such
facilities. Such signed acknowledgments and articles of incorporation must be recorded
with the Judge of Probate of Mobile County prior to issuance of a Certificate of
Occupancy.
10b. Each year after initial submission of a plan for maintenance and immediately upon any
change in ownership, the owner of the Commercial Site’s storm water detention facilities
shall submit an update to the maintenance plan with a qualified professional’s statement
affirming the current operation of the facilities related to the initial and ongoing intended
purpose. If any deficiency exists, the statement shall describe the corrective actions and
the schedule for completing these actions and an application for a new permit may be
required.
11. Reference should be made to the Mobile County Flood Damage Prevention Ordinance.
Any proposed development that lies within a Special Flood Hazard Area, whether in
whole or in part, shall submit a “Permit to Develop in a Special Flood Hazard Area.”
12. The flood zone designation, community panel number, map number & date as obtained
from a Federal Emergency Management Agency Flood Insurance Rate Map dated March
17, 2010, or subsequent LOMR, shall be shown on the site plan. Flood zones (and
floodways, if established), shall be delineated on the site plan. If the commercial site
contains a flood zone designated as A1 - A30 or “AE“ zone, then the limits of the “A“
flood zone shall be delineated by physical elevations corresponding to the established
base flood elevation. If improvements which involve filling are proposed within an “A“
zone without an established base flood elevation, or an “A” zone with a B.F.E. without a
delineated floodway, the developer shall provide a flood study with the commercial site
plan submittal insuring that the proposed fill will not raise the water surface elevation
more than 1.0 foot. No improvements will be permitted within a designated floodway.
13. The Alabama Licensed Professional Engineer shall show the A.A.S.H.T.O. intersection
sight distances for each proposed intersection with an existing County maintained road.
Sites that significantly impact the existing traffic patterns shall depict the adjacent
accesses to County right-of-way.
14. A note shall be added to the site plan requiring the contractor to contact the Mobile
County Public Works Engineering Manager at 574-4030 to discuss the conditions of the
County maintained road leading to the construction site prior to performing any work
within the County maintained right-of-way.
15. All materials and workmanship proposed within a County right-of-way shall conform to
the Alabama Department of Transportation Standard Specifications for Highway
Construction, Current Edition.
16. If the site is located adjacent to a State right-of-way, a copy of the permit from the
Alabama Department of Transportation shall be supplied to the Mobile County
Engineering Department prior to approval by said Mobile County.
S i t e P l a n R e q u i r e m e n t s f o r L a n d D i s t u r b a n c e P a g e | 4
Mobile Government Plaza ∙ 205 Government Street ∙ Mobile, Alabama 36644-1600
Phone: (251) 574-8595 ∙ Fax: (251) 574-4722 ∙ www.mobilecountypublicworks.net
CERTIFICATION OF PROFESSIONAL ENGINEERING DESIGN & CONSTRUCTION
FOR SITE PLAN APPROVAL OF A COMMERCIAL SITE PLAN
I, __________________________________, a Professional Engineer registered in the
State of Alabama, Registration Number ________________, do hereby certify that the
commercial site plan for ______________________________________, that is hereby
submitted to the County Engineer has been designed under my supervision.
I further certify that the drainage system for this site development has been designed to
meet, at a minimum, the ten (10) year flood storm criteria. This design will ensure that
all drainage waters occurring during a storm of less than ten (10) year storm magnitude
will be released onto the County Right of Way or drainage easement at a rate that is less
than or equal to the rate being released onto said Right of Way or easement prior to
construction of this site as shown on the accompanying drainage calculations submitted
with this certification.
I further certify that this site has been designed in accordance with Alabama Handbook
for Erosion Control, Sediment Control and Stormwater Management on Construction
Sites and Urban Areas, Current Edition as shown on the site plans submitted to the
County Engineer.
I further certify that I will watch over and assure to the County that all site work will be
performed in accordance with the site plans submitted to the County Engineer.
I acknowledge that in the event that Certification given herein shall be determined by the
County Engineer to be grossly incorrect, the County may thereafter refuse to accept the
certification of the undersigned.
NAME _____________________________________________________
P.E. # _____________________________________________________
TITLE _____________________________________________________
FIRM _____________________________________________________
DATE _____________________________________________________
S i t e P l a n R e q u i r e m e n t s f o r L a n d D i s t u r b a n c e P a g e | 5
Mobile Government Plaza ∙ 205 Government Street ∙ Mobile, Alabama 36644-1600
Phone: (251) 574-8595 ∙ Fax: (251) 574-4722 ∙ www.mobilecountypublicworks.net
Rainfall Data for Mobile, AL
Duration
(min)
2 YR
10 YR
25 YR
50 YR
100 YR
5
6.05
8.75
9.1
10.1
11
6
5.9
8.42
9
9.9
10.9
7
5.7
8.13
8.85
9.7
10.5
8
5.4
7.86
8.5
9.5
10.2
9
5.3
7.61
8.35
9.2
10
10
5.1
7.38
8
9
9.8
11
5
7.15
7.9
8.65
9.5
12
4.9
6.95
7.75
8.5
9.2
13
4.7
6.75
7.6
8.4
9
14
4.5
6.57
7.4
8.15
8.7
15
4.4
6.4
7.1
7.9
8.5
20
3.9
5.7
6.35
7
7.5
25
3.5
5.17
5.6
6.45
6.9
30
3.2
4.75
5.1
5.75
6.3
40
2.7
4.1
4.4
4.9
5.5
50
2.4
3.61
3.8
4.4
4.7
60
2.1
3.25
3.4
3.9
4.3
120
1.3
1.85
2.2
2.4
2.7
180
0.94
1.45
1.7
1.85
2
240
0.78
1.2
1.4
1.5
1.7
300
0.65
1
1.2
1.3
1.4
360
0.57
0.9
1.1
1.15
1.3
480
0.47
0.73
0.85
0.9
1.1
600
0.4
0.62
0.75
0.83
0.9
720
0.35
0.55
0.65
0.74
0.8
1080
0.26
0.45
0.49
0.55
0.6
1440
0.23
0.35
0.4
0.45
0.5
S i t e P l a n R e q u i r e m e n t s f o r L a n d D i s t u r b a n c e P a g e | 6
Mobile Government Plaza ∙ 205 Government Street ∙ Mobile, Alabama 36644-1600
Phone: (251) 574-8595 ∙ Fax: (251) 574-4722 ∙ www.mobilecountypublicworks.net
Rainfall Data for Mobile, AL
PDS-based precipitation frequency estimates with 90% confidence intervals
(in inches/hour)
1
Duration
Average recurrence interval (years)
2
10
25
50
100
200
500
5-min
8.68
11.8
13.8
15.3
16.9
18.5
20.6
(7.20-10.4)
(9.71-14.2)
(10.9-17.1)
(11.9-19.2)
(12.6-21.7)
(13.1-24.3)
(14.0-27.8)
10-min
6.35
8.65
10.1
11.2
12.4
13.5
15.1
(5.27-7.60)
(7.11-10.4)
(8.00-12.5)
(8.68-14.1)
(9.20-15.9)
(9.62-17.8)
(10.3-20.3)
15-min
5.16
7.03
8.21
9.13
10.1
11
12.3
(4.29-6.18)
(5.78-8.47)
(6.50-10.2)
(7.06-11.4)
(7.48-12.9)
(7.82-14.5)
(8.36-16.5)
30-min
3.62
4.99
5.85
6.52
7.2
7.88
8.79
(3.00-4.33)
(4.10-6.01)
(4.64-7.25)
(5.04-8.18)
(5.36-9.23)
(5.60-10.4)
(5.99-11.8)
60-min
2.38
3.3
3.9
4.39
4.89
5.41
6.13
(1.97-2.84)
(2.71-3.97)
(3.10-4.86)
(3.40-5.52)
(3.65-6.29)
(3.85-7.13)
(4.18-8.28)
2-hr
1.47
2.05
2.44
2.76
3.09
3.44
3.93
(1.23-1.75)
(1.69-2.45)
(1.95-3.02)
(2.15-3.46)
(2.32-3.96)
(2.47-4.52)
(2.70-5.28)
3-hr
1.11
1.56
1.88
2.14
2.42
2.71
3.13
(0.932-1.32)
(1.30-1.86)
(1.51-2.33)
(1.68-2.68)
(1.82-3.09)
(1.96-3.55)
(2.16-4.20)
6-hr
0.685
0.993
1.21
1.4
1.59
1.8
2.1
(0.576-0.806)
(0.827-1.18)
(0.982-1.50)
(1.10-1.74)
(1.21-2.03)
(1.31-2.35)
(1.46-2.81)
12-hr
0.411
0.62
0.768
0.891
1.02
1.16
1.36
(0.348-0.481)
(0.519-0.729)
(0.625-0.942)
(0.706-1.10)
(0.781-1.29)
(0.850-1.51)
(0.956-1.81)
24-hr
0.243
0.372
0.464
0.542
0.626
0.716
0.844
(0.206-0.282)
(0.313-0.434)
(0.381-0.567)
(0.432-0.668)
(0.481-0.788)
(0.526-0.923)
(0.595-1.11)
2-day
0.14
0.211
0.263
0.308
0.357
0.411
0.487
(0.119-0.161)
(0.178-0.244)
(0.218-0.321)
(0.248-0.379)
(0.277-0.448)
(0.304-0.527)
(0.346-0.640)
3-day
0.101
0.152
0.189
0.221
0.255
0.292
0.346
(0.087-0.116)
(0.129-0.175)
(0.157-0.229)
(0.178-0.269)
(0.198-0.318)
(0.217-0.373)
(0.247-0.452)
4-day
0.081
0.12
0.148
0.173
0.199
0.228
0.268
(0.069-0.092)
(0.102-0.138)
(0.123-0.179)
(0.139-0.210)
(0.155-0.247)
(0.169-0.290)
(0.192-0.350)
7-day
0.053
0.075
0.091
0.105
0.12
0.137
0.161
(0.045-0.060)
(0.064-0.086)
(0.076-0.109)
(0.085-0.127)
(0.094-0.149)
(0.103-0.173)
(0.115-0.208)
PERMIT TO DEVELOP
STATE OF ALABAMA, MOBILE COUNTY
Permit No._____________ Issuance Date___________________
This permit expires ONE YEAR from the Issuance Date.
DEVELOPMENT OR SUBDIVISION NAME: _____________________________________________
DEVELOPER/CONTRACTOR: ________________________________________________
CONTACT NAME: _________________________ CONTACT NUMBER: ________________________
TYPE: (CHECK ONE) □ Minor □ Major – NPDES No. ____________
LOCATION______________________________________________________________________________________________
_______________________________________________________________________________________________________
_____County Commission Proposed Plat Approval _____Planning Commission Proposed Plat Approval _____Not Applicable
Date _______________ No. Proposed Lots _______________
Authorized Signature_________________________ Authorized County Signature__________________________
For Inspections or Complaints Call INSPECTION SERVICES at (251) 574-3507 or Email INSPECTIONS@MOBILECOUNTY.NET
THIS CARD MUST BE ON-SITE AT ALL TIMES DURING ANY CONSTRUCTION ACTIVITY.
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COMMERCIAL SITE PLAN REQUIREMENTS (Mobile County Commission)

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Completed 18 July 2020

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