1221 Deerfield Blvd.tif 0o0a
LITTLE BLOSSOMS DAYCARE
1221 DEERFIELD BLVD.
BLAIR, NE 68008
July 30, 2013
PROJECT:
The site is currently a vacant lot covered with grass. The proposed development wil I be a small daycare
building with a parking lot taking up less than half of the current vacant lot.
The site requires storm water runoff for the 100 year storm event for the proposed development must not
exceed the current 100 year runoff. The lot site is approximately 3.80 acres in size.
Wed,7 Aug 2013 14:22:53
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SITE MAP
ed,7 Aug 2013 14:22:53
TOPOGRAPHIC_SIJF?VEY
` LOT 61 OF DEERFIELD ADDITION
A REPLAT OF LOT 4, OF DEERFIELD, AN ADDITION TO THE CITY OF SLAIR
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PROPOSED IN
CONTOUR, TYP. I I_
EXISTING ((
FLOW CONTOUR, TYP,
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* SLOW
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',RUSHED � \ �� - ._.1485 �s✓
RUC110N�
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PROVIDE SILT FENCE AROUND AREA
INLET UNTIL SITE IS STABILIZED Oj
TO OWNERS SATISFACTION
PR OVIDE INLET PROT SYSTEM
ADD
AW P PREVENTION
--
N / TION PLAN/ LEGEND
ROSION C PLAN (+,7PPP PROPOSED CONTOUR
PROPOSSED CONTO OUR
30'-0"
-- X SILT FENCE
T OTAL ACRES: 3.80 EXISTING PERVIOUS COVERAGE _= 3.80 ac RUNOFF 100 YEAR EVENT:
sUB BASiN AREAS AREA FUTURE PERVIOUS COVERAGE = 5.95 ac EXISTING LOT — 3,80 ac
A — 0.30 ac LOSS OF PERVIOUS COVERAGE = 0.85 ac PRE DEVELOPED C = 0.55
B — 0.26 ac POST DEVELOPED C = 0.61
�FSTRIDGE DR. C _ 0.08 ac TIME OF CONCENTRATION C 5 MIN FOR ALL AREAS PRE DEVELOPED RUNOFF 31.6 cfs
GRADING .DISRURDEO AREA = 2.85 ac POST DEVELOPED RUNOFF 35.0 cis
GRADING UNDISTURBED AREA = 0.95 ac DETENTION REQUIRED
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Wed,7 Aug 2013 14:22:53
LITTLE BLOSv
3" I. D . SEE ARCHITECTURAL AN
PVC WATER LINE.
5 FEET BEHIND BACK OF CURB FOR EXACT BUILDIN0 N
TER UTILITY. CONTRACTOR MANHOLE E,F.E•
kT10N, RIM= 1090.00 (VERIFY EXACT ICU!
1,E.=1085,00
I ARCHITECT BEFORE
i
- PARKING LOT 100 YEAR
DETENTION AREA, TYP.
450 C.F. OF STORMWATER DETENTION
STORAGE. DEPTH LESS THAN 6"
0
-BASIN Q
AREA INLET/ DETENTION STRUCTURE
�H \ RIM = 87.40
LE. = 82.40
�C.F, STORAGE 80 C.F,
t
405 C.F. OF
STORM WATER
- - TAP EXIST. DETENTION BASIN
AREA INLET STORAGE.
DEPTH LESS AREA INL
THAN 6" RIM = 81
LE. = O
C.F.
� .F. 5TQI
--- �' TAP EXIST.
12" I.D. ADS 'N-12* STORM SEWER----
EWER AREA 'INLET
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Wed,7 Aug 2013 14:22:53
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TOTAL SITE STORM DETENTION ANALYSIS
29 0f /rGl�L U1
A. OVERALL SITE - (100 YEAR EVENT-
EXISTING CONDITIONS:
SURFACE ACRES C Tc PEAK FLOW
GRASS 3.80 .55 5 — -- JC I} )? 3 c
PAVED 0.00 0 --
TOTAL 3.80 ,55 5 y 31.6 cfc fNy
PROPOSED CONDITIONS:
S U R FACE ACRES C Tc PEAK FLOW }
GRASS 2.95 .55 5
PAVED 0.85 Q.,AS - 5 -.__—
TOTAL 3.80 f1' 5 35.0 cfc
INCREASE OFfc THEREFOR DETENTION REQUIRED. 37•
{�f - panoLp
DETENTION PROVIDED: BASIN A BASIN B
DETENTION STRUCTURE/ INLET: 80 d. 68 c,f.
ON SITE PARKING AREA: 450 c.f. 405 c.f. 1 i)/ v6 APf
TOTAL DETENTION PROVIDED = 530 c.f. 473 c.f. QQ _ ` ` 53 0 / Tu
TOTAL DETENTION REQUIRED = 505 c.f. 471 c.f. --�- -� ---
(TOTALS INCLUDE ADDITIONAL REQ71 ED DETENTION FOR 15�%� I ; ?,q�u�,',
ENTRANCE DRIVE DRAINAGE TO STRE
DESIGNER / ENGINEER/ INSPECTOR ( ' 1 -/s
BLAKEMAN ENGINEERING �„ }j� ~ - � 7 c A -_
BRAD BLAKEMAN 505"
10423 HANSEN AVE. -
OMAHA, NE 68124
402 -933 -5777 t �",�L :��
VA - ,0
1
Wed,7 Aug 2013 15:17:20
Allen Schoemaker
To: Blakeman Engineering
Cc: Phil Green (Blair, NE)
Subject: RE: Little Blossoms Day Care - Blair, N.E.
Attachments: Storm Water Mgt Plan Example Hand.8- 7- 13.pdf
Brad,
Thanks for sending me the latest version of the storm water management plan for the Little Blossoms Daycare you
developed. Unfortunately I cannot grant approval of the report you submitted due to the following deficiencies:
• It appears that the new building was left off of the calculations for new impervious area. Please include the new
building in your calculations. All that is shown is for pavement.
• The coefficient you used for pavement is 0.85. The requirement for coefficient for pavement is 0.95. Using this
higher coefficient increases the difference runoff to 5.12 cfs per my calculations. Please recalculate and
resubmit with the new calculations.
• Please submit a copy of the time of concentration.
• Please show all calculations supporting your numbers within your report.
• Please show the calculation for maximum discharge pipe size. You show a 12" pipe but is this the right diameter
of pipe for the required detention?
• 1 am concerned you are planning on using the new curb for the detention but as I have shown above there is
going to be more storm water that needs to be detained. I will need you to show how the additional storm
water water will not overtop the new curb or the inlets will need to be moved to the middle of the parking area.
Please contact me with any questions. I have once again attached a sample report from another development project in
Blair that you are free to use as a template for this project.
Director of Public Works
City of Blair
402 -426 -4191
ARS @ci.blair.ne.us
From: BlakemanEngineering [ mailto :blakemanengineering @cox.net
Sent: Monday, August 05, 2013 11:02 AM
To: Allen Schoemaker
Subject: RE: Little Blossoms Day Care - Blair, N.E.
Al,
Attached report again for your information.
Please notify Building Permit officials to release building permit for Little Blossoms.
Any further or additional comments or questions should be directed at me.
Brad
1
Wed,7 Aug 2013 15:54:10
Brad Blakeman, P.E.
Blakeman Engineering
10423 Hansen Ave.
Omaha, NE 68124
402.933.5777
http : / /www.blakemanengineering.com/
From: Allen Schoemaker [ mailto:arsCabci.blair.ne.us ]
Sent: Tuesday, July 30, 2013 9:25 AM
To: BlakemanEngineering; Howard Wolfe
Cc: Phil Green (Blair, NE)
Subject: RE: Little Blossoms Day Care - Blair, N.E.
Brad,
Please send the report.
Al
2
Wed,7 Aug 2013 15:54:10