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OFFSITE GRADING PLAN
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EX. 30' R.O.W.
2T ROAD SECTION
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EXISTING ROAD WIDTH VARIES -I
2.0% MIN.
1.8% &0% MAX.
EXISTING PAVEMENT
R/R'�\�
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SAWCUT EXISTING ROAD 2' FROM
EXISTING EDGE OR AS NECESSARY
CONCRETE SIDEWALK PER TO MEET MIN/MAX SLOPE.
ACHD SD-709 2.5" ASPHALT PAVEMENT
4" 3/4" MINUS ROADMIX
14" 6" MINUS PITRUN
ROLLED CURB AND
GUTTER PER ACHD SD-702
NE 4TH STREET SECTION
L SCALE NTS
!t �xr K x � z x �x x
NOTES:
1. CONSTRUCTION OF SEEPAGE BED SHALL BE PER THE LATEST VERSION OF
ACHD STORMWATER DESIGN GUIDELINES BMP 20 "SEEPAGE BED WITH
OPTIONAL CHAMBERS"
2. PERF. PIPE SHALL BE 18 INCH ADS, N-12 "SOIL TIGHT" PIPE WITH AASHTO
CLASS II PERFORATION PATTERN. INSTALL PER MANUFACTURERS
REQUIREMENTS.
3. CONTRACTOR SHALL NOTIFY THE ENGINEER IMMEDIATELY IF GROUNDWATER
IS ENCOUNTERED WITHIN 3' OF THE BOTTOM DESIGN ELEVATION FOR ANY
INFILTRATION FACILITY.
4. CONTRACTOR SHALL EXCAVATE TO 5' BELOW BOTTOM DEPTH AND HAVE
SOILS VERIFIED BY ENGINEER AND ACHD REPRESENTATIVE PRIOR TO
CONSTRUCTION OF SEEPAGE BED.
5. DEPTH TO GROUNDWATER ESTIMATED TO REMAIN GREATER THAN 16.0'
BELOW GROUND SURFACE. SEE "GROUNDWATER LETTER" PREPARED BY
MATERIALS TESTING & INSPECTION PREPARED JANUARY 22ND, 2020
6. COORDINATE WITH ACHD INSPECTION FOR PLACEMENT OF ELECTRONIC
MARKERS AT EACH CORNER OF FACILITY DURING CONSTRUCTION PRIOR TO
BACKFILLING. ACHD TO PROVIDE MARKERS.
SEEPAGE BED DETAIL
SCALE NTS
I.
I
OBSERVATION WELL PER ACHD
SD-627, WRAP PORTION IN SAND
SEDIMENT MANHOLE PERWITHWITH DRAINAGE GEOTEXTILE
OR G RATED
HS25 OR GREATER OVEN GEOTEXTILE FABRIC REQUIRED OVER TOP. -
ACHD SSEE SECTION 8202.23 FOR GEOTEXTILE REQ'S.
PERFORATION
SCHED. PER BMP 20
KEYNOTES:
SURVEY MONUMENTS TO BE RETAINED AND PROTECTED.
OEXISTING
1
CONTRACTOR SHALL HAVE A LICENSED SURVEYOR LOCATE AND MARK ALL
EXISTING MONUMENTS PRIOR TO CONSTRUCTION. ANY MONUMENT
DISTURBED BY CONSTRUCTION ACTIVITIES SHALL BE REPLACED BY A
LICENSED LAND SURVEYOR AT THE EXPENSE OF THE CONTRACTOR.
OCONTROL
POINT: #1- MCP. BABYMAG, EL. = 2596.78
O
PROPERTY LINE.
AC WIDENING/PATCH. PAVEMENT SHALL BE SP-3, 1/2" MIX,
OPROPOSED
PG-64-28, SECTION PER DETAIL 2 OR MATCH EXISTING, WHICHEVER IS
GREATER.
OAC
SAWCUT LINE. PATCH TO MATCH EXISTING PER LIMITS SHOWN.
OINSTALL
ROLLED CURB AND GUTTER PER ACHD SD-702.
OINSTALL
ATTACHED 5' SIDEWALK PER ACHD SD-709, 5" THICK CONCRETE
WITH 4" OF 3/4" MINUS CRUSHED BASE.
O
INSTALL TYPE IV CATCH BASIN PER ACHD SD-604A FOR ROLLED CURB.
O9
INSTALL SEDIMENT MANHOLE PER ACHD SD-611, RATED HS25 OR GREATER.
LID SHALL BE SOLID AND RATED FOR ADA FOOT TRAFFIC.
SEEPAGE BED PER DETAIL 3, SHEET C1.0 AND THE LATEST VERSION
OINSTALL
10
OF ACHD STORMWATER DESIGN GUIDELINES BMP 20. SEEPAGE BED TO BE
INSTALLED UNDER PROP. SIDEWALK.
NOTE:
o
CONTRACTOR SHALL VERIFY SIDEWALK
CROSS SLOPE DOES NOT EXCEED 2%.
NO TOLERANCES ALLOWED PER ACHD
INSPECTION STAFF.
SEEPAGE BED DRAINAGE CALCULATIONS
PROPOSED IMPERVIOUS CONTRIBUTING AREA
°
PARKING LOT/SIDEWALK/ROOF: 1763SF C=0.95
LANDSCAPEAREA: OSF C--0.20
TOTAL AREA= 1763SF C=0.95
STORAG E VOLUME AND DRAINAGE REQUIREMENTS
° 100YR- 1 HOUR VSTORM= (CONTRIBUTING AREA*C)*(1"/12INCH ES/FT)
100YR-1HOUR VSTORM= 140CF
MAXIMUM DRAINAGETIME= 48HOURS
SEEPAGE BED CAPACITY
SEEPAGE BED AREA = 75.0 SF 15.O' L x 5.0' W
SEEPAGE BED DEPTH = 5.00 FT
DRAIN ROCK VOLUME= 375CF
3 . DRAIN ROCK VOID RATIO = 0.4
DRAIN ROCK STORAGE VOL. = VOLUME*VOID RATIO
a
TOTAL STORAGE VOLUME= 150CF > REQUIRED, OK
INFILTRATION WINDOW CAPACITY
INFILTRATION WINDOWAREA= 75.05F 15.0' Lx 5.0' W
INFILTRATION RATE=8.OIN/HR OR0.67FT/HR
TOTAL BASIN DRAIN TIME= VSTORM/(SAND FILTER AREA * INFILTRATION RATE)
TOTAL BASIN DRAIN TIME= 3HR < REQUIRED, OK
SAND & GREASE TRAP THROAT VELOCITY
THROAT FLOW AREA= 6.8SF 1.7'Lx4.0'W
100YEARQ= 0.1CFS
THROAT VELOCITY = 0.02 FPS <0.5 MAXIMUM, OK
4 STORM CALCS,
SCALE: N�TS
5'
MIN.
SIDEWALK EL. 2597.90
12" INLET FROM
TOP OF BED EL. 2595.90
CATCH BASIN
3'
I.E. 2594.0
NON-PERF. PIPE 18" ADS N-12 PERFORATED PIP
.;
5
18" I.E. 2593.90
2' MIN. SUMP
4'g 2" ANGULAR ROCK
BOTTOM OF DRAIN ROCK EL 2590.90
ASTM C33 FILTER SAND
11.5'
NONWOVEN GEOTEXTILE FABRIC ON
�}
BOTTOM OF SAND EL. 2589.40
TOP AND SIDES. OVERLAP 12" MIN AT
1 T
SEAMS. SEE SECTION 8202.23
13'
GEOTEXTILE REQUIREMENTS.
DESIGN INFILTRATION
INSTALL 30 MIL PVC LINER ALONG
RATE = 8"/HR
12" BELOW SAND LAYER
EAST AND SOUTH SIDES.
(WILL DRAIN IN 24 HRS
(3' MIN.)
-----------WITH<i--
HIGH GROUNDWATER
NZ
15 CALL DIGLINE AT 811
BEFORE YOU DIG!
Ninw. what, below.
Cell beforeyoudig.
Drawings not to be reproduced without
written permission from
Alpha Omega Engineering LLC.
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REVISIONS
NO. DATE DESCRIPTION
PROJECT #: 22006
DATE: 02-11-22
DRAWN BY: MRL
SHEET TITLE:
OFFSITE
GRADING &
DRAINAGE
PLAN
SHEET NO.: