Preliminary Engineering Plans Pg5to
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BLISS DRIVE
R 679.70 _m___
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FG 681.00 -------
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R 680.00
680.80 R 680.00
R 680.70
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22ND STREET
UNDERGROUND DETENTION SYSTEM
TOP OF CHAMBER=678.50
BOT OF CHAMBER=675.83
BOT OF STONE=675.33
GRADING LEGEND
EP =
EDGE OF PAVEMENT
FL =
FLOW LINE
TC =
TOP OF CURB
ME =
MATCH ELEVATION
TF =
TOP OF FOUNDATION
R =
RIM ELEVATION
TW =
TOP OF WALL
FG =
FINISHED GRADE
TS =
TOP OF STAIRS
BS =
BOTTOM OF STAIRS
RIDGE RIDGE UNE
FLOW DIRECTION
100 -YEAR OVERLAND OVERFLOW ROUTE
Before
GRAPHIC SCALE IN FEET
0 15 30 60
GRADING NOTES
1. CONTRACTOR TO VERIFY ALL EXISTING TOPOGRAPHY AND STRUCTURES ON THE
SITE AND IMMEDIATELY NOTIFY THE ENGINEER OF ANY DISCREPANCIES PRIOR
TO STARTING WORK.
2. ALL PAVEMENT SPOT GRADE ELEVATIONS AND RIM ELEVATIONS WITHIN OR
ALONG CURB AND GUTTER REFER TO FLOW LINE ELEVATIONS UNLESS
OTHERWISE NOTED.
3. ALL ELEVATIONS SHOWN DEPICT FINISHED GRADE UNLESS OTHERWISE NOTED.
GENERAL CONTRACTOR TO COORDINATE WITH EXCAVATION, LANDSCAPE AND
PAVING SUBCONTRACTORS REGARDING TOPSOIL THICKNESS FOR LANDSCAPE
AREAS AND PAVEMENT SECTION THICKNESS FOR PAVED AREAS TO PROPERLY
ENSURE ADEQUATE CUT TO ESTABLISH SUBGRADE ELEVATIONS.
4. NO EARTHEN SLOPE SHALL BE GREATER THAN 3:1, UNLESS OTHERWISE NOTED.
5. MAXIMUM SLOPE IN ACCESSIBLE PARKING SPACES AND LOADING ZONES SHALL
NOT EXCEED 2.09 IN ALL DIRECTIONS.
6. MAXIMUM RUNNING SLOPE SHALL NOT EXCEED 5% AND CROSS SLOPE SHALL
NOT EXCEED 2% ON ALL SIDEWALKS AND ACCESSIBLE ROUTES.
7. WHEN NATURAL FLOW OF DRAINAGE IS AWAY FROM CURB, CONTRACTOR TO
INSTALL REVERSE GUTTER PITCH.
8. MATCH EXISTING ELEVATIONS AT THE PROPERTY LIMITS.
�.%%- PERFORATED 6" PVC
�� '4�`x.� PIPE WITH NYLON SOCK.
v ,qtt T'. 18 i i
18" SOIL MEDIA MIX, _\ VB `; -� 4 '-s J �- "NATNE SOIL
50% SAND ti. y"'s 'K=i-� :.+J�,.>; c.. .,+a`rt'y ✓�K�r
VC (ABOVE INVERT OF
30% 0% TOPSOIL 0' M UNDERDRAIN)
(OR DISTRICT MIX) Y VD(BELOWINVERT OF
2'-3.5' OFFSET UNDERDRAIN)
WOVEN GEOTEXTILE FABRIC, '
NOT TO COVER ENTIRE
BOTTOM OF EXCAVATION
(OR CHOKING STONE PER
ENGINEER APPROVAL) SEASONALLY HIGH_. -- CA -7 COARSE AGGREGATE STORAGE BED
GROUNDWATER LEVEL WITH 4" UNDERDRAIN PERFORATED PIPE
NAVD 88) (SEE NOTE 6)
2" TO 12" STONE BEDDING
(SEE NOTE 7)
VOLUME TY_PE
-_._
;- OBSERVATION WELL, 6'
,MEDIA VOLUME
STORAGE VOLUME VOLPROVIDED
DEEP ROOTED NATIVE PLANTS, •,
PVC PIPE WITH OVERFLOW
--
1.00
VA
INSTALLED AS SPECIFIED ON PLANS.
GRATE. NON PERFORATED
..._-.UM-E --------
9,393 CF
0
USE VEGETATION TOLERANT OF WET
ABOVE SOIL MEDIA MIX 6"
- 12" ,,
SHREDDED HARDWOOD
AND DRY CUYCLES. '..
! ABOVE GROUND.
COARSE AGG. (ABOVE INVERT)
MULCH LAYER (3") (SEE NOTE 8)
VEGETATED FILTER -
W W n o
0.5 x 0.36 x V.
1,327 CF
°�
STRIP/OTHER BMPS 20%
AX.
12" DEPTH MAXIMUM
20%
VEGETATED FILTER
(SEE NOTE 9)
., I
332 CF
140.
STRIP/OTHER BMPS
SLOPE
DRAINS IN 24-08 HOURS �
SLOPE
t (SEE NOTE 9)
VA
�.%%- PERFORATED 6" PVC
�� '4�`x.� PIPE WITH NYLON SOCK.
v ,qtt T'. 18 i i
18" SOIL MEDIA MIX, _\ VB `; -� 4 '-s J �- "NATNE SOIL
50% SAND ti. y"'s 'K=i-� :.+J�,.>; c.. .,+a`rt'y ✓�K�r
VC (ABOVE INVERT OF
30% 0% TOPSOIL 0' M UNDERDRAIN)
(OR DISTRICT MIX) Y VD(BELOWINVERT OF
2'-3.5' OFFSET UNDERDRAIN)
WOVEN GEOTEXTILE FABRIC, '
NOT TO COVER ENTIRE
BOTTOM OF EXCAVATION
(OR CHOKING STONE PER
ENGINEER APPROVAL) SEASONALLY HIGH_. -- CA -7 COARSE AGGREGATE STORAGE BED
GROUNDWATER LEVEL WITH 4" UNDERDRAIN PERFORATED PIPE
NAVD 88) (SEE NOTE 6)
2" TO 12" STONE BEDDING
(SEE NOTE 7)
VOLUME TY_PE
-_._
POROSITY
,MEDIA VOLUME
STORAGE VOLUME VOLPROVIDED
O
----
SURFACE STORAGE
--
1.00
VA
-
1.00 X VA
..._-.UM-E --------
9,393 CF
0
SOIL MEDIA MIX
0.25
VB
m
0.5 x 0.25 x VB
2,072 CF
COARSE AGG. (ABOVE INVERT)
0.36
Vc
W W n o
0.5 x 0.36 x V.
1,327 CF
COARSE AGG. (BELOW INVERT)
0.36 _..
Vo
0.36 x Vo
332 CF
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TOTAL
13,123 CF
NOTES:
1. OFFSET A MINIMUM OF 10 FEET FROM FOUNDATIONS UNLESS WATERPROOFED, 20 FEET FROM SANITARY
SEWERS, 20 FEET FROM ROADWAY GRAVEL SHOULDER AND 100 FEET FROM POTABLE WATER WELLS OR
SEPTIC TANKS.
2. AVOID INSTALLATION ON SLOPES GREATER THAN 15 TO 1 AND ABOVE COMPACTED FILL.
3. WOVEN GEOTEXTILE FABRIC SHALL MEET REQUIREMENTS OF IUM MATERIAL SPECIFICATION 592
GEOTEXTILE, TABLE 1, CLASS 1, WITH AN APPARENT OPENING SIZE OF 50 MM.
4. STONE STORAGE OPTIONS ARE CA -7, DISTRICT VULCAN MIX, OR APPROVED ALTERNATE. NO RECYCLED
MATERIALS.
5. MINIMUM DISTANCE OF 2 FEET (3.5 FEET IN COMBINED SEWER AREAS) BETWEEN BOTTOM OF BMP AND
SEASONALLY HIGH GROUNDWATER LEVEL.
6. UNDERDRAINS ARE REQUIRED IN TYPICAL CLAYEY SOILS WHERE INFILTRATION RATES ARE LESS THAN
0.5 INCH/HOUR. NO MORE THAN 1 UNDERDRAIN EVERY 30 FEET ON CENTER. PROVIDE A SOIL REPORT
DOCUMENTING NATIVE INFILTRATION RATE TO FOREGO UNDERDRAINS. NO FILTER FABRIC COVER/SOCK.
7. MINIMUM UNDERDRAIN BEDDING OF 2 INCHES, MAXIMUM OF 12 INCHES.
8. MULCH LAYER SHALL BE HARDWOOD MULCH OR OTHER NON -FLOATING GROUND COVER.
9. FOLLOW THE REQUIRED PRETREATMENT MEASURES LISTED ON THE VOLUME CONTROL PRETREATMENT
MEASURES DETAIL, PAGE 17.
TECHNICAL GUIDANCE MANUAL
BIORETENTION FACILITY DETAIL
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ORIGINAL ISSUE:
11/05/2015
KHA PROJECT NO.
168403000
SHEET NUMBER
C2.0