HomeMy WebLinkAboutR-43882500
00
C'7
It
i
LU
"� _j
'p w
U
> ry
U �
�W
0)
00
O 00
� O
N
N N
N
N �
O D
N
O 0
a
U_
Know what's below.
Call before you dig.
��++ T . kr
.� ��GISTEg�9
� S ONAL
05/15/2026
T A C O M A S E A T T L E
S P O K A N E T R I- C I T I E S
2215 North 30th Street, Suite 300 Tacoma, WA 98403
253.383.2422 TEL 253.383.2572 FAX www.ahbl.com WEB
*8,
* UNLESS
OTHERWISE
NOTED ON PLANS
00000000000 0000
00000000000 0000
00000000000 O O
O O O O O O O O O O O INLET/OUTFALL PIPE
O O O O O 0 10�0�T
0000000000000000
PLAN
�0
EXISTING AND/OR �-
PROPOSED GROUND�p1PE
OOC�-'�
O�O47
n0 n0 O
12" MIN. DEPTH (12"0 PIPE)
4" MIN. FACE 18" MIN. DEPTH (15"-18"0 PIPE)
QUARRY ROCK 24" MIN. (24"-36" O PIPE)
SECTION
OUTLET PROTECTION
NOT TO SCALE
ROOF DOWNSPOUT SEE
ARCHITECTURAL DETAILS.
6" PVC CAP CUT HOLE TO ALLOW
DOWNSPOUT TO PENETRATE
WITH 1/8" CLEARANCE.
6" PVC SDR 35 TYP. 2" MIN
FINISHED GRADE --\ 4" -
COORDINATE DOWNSPOUT LOCATIONS WITH I I —I I I —I 11--H
ARCHITECTURAL PLANS AND NOTCH FOOTINGS —III 12' MIN.
TO ACCOMMODATE ROOF DRAINS. _—I (—
SURFACE SEAL: NATIVE SOIL OR
OTHER LOW PERMEABILITY MATERIAL. 18" (MIN.)
4" PERFORATED RIGID DRAIN PIPE-�
REQUIRED AT LANDSCAPE AREAS
..........
(SURROUND WITH 1" ROCK)''"
2" (MIN.)
°
i
a
a a
°'
Q
a
°
4
A 4
FOOTING 6" BELOW
GRADE AT DOCKS.
REFER TO STRUCTURAL.
j BUILDING
FOUNDATION SEE
CONNECT TO 0.5% STRUCTURAL DETAILS
DETENTION SYSTEM MIN. PROVIDE FITTINGS
AS REQUIRED
NOTES:
DO NOT TIE ROOF DOWNSPOUTS TO FOOTING DRAIN.
SURFACE SEAL TO CONSIST OF 12" OF LESS PERMEABLE, SUTIABLE SOIL. SLOPE AWAY FROM BUILDING.
ROOF DOWNSPOUT AND FOOTING DRAIN
NOT TO SCALE
SOIL AMENDMENT
• SOIL RETENTION. RETAIN, IN AN UNDISTURBED STATE, THE DUFF LAYER AND NATIVE TOPSOIL TO THE MAXIMUM EXTENT PRACTICABLE. IN ANY
AREAS REQUIRING GRADING REMOVE AND STOCKPILE THE DUFF LAYER AND TOPSOIL ON SITE IN A DESIGNATED, CONTROLLED AREA, NOT
ADJACENT TO PUBLIC RESOURCES AND CRITICAL AREAS, TO BE REAPPLIED TO OTHER PORTIONS OF THE SITE WHERE FEASIBLE.
• SOIL QUALITY. ALL AREAS SUBJECT TO CLEARING AND GRADING THAT HAVE NOT BEEN COVERED BY IMPERVIOUS SURFACE, INCORPORATED
INTO A DRAINAGE FACILITY OR ENGINEERED AS STRUCTURAL FILL OR SLOPE SHALL, AT PROJECT COMPLETION, DEMONSTRATE THE
FOLLOWING:
1. A TOPSOIL LAYER WITH A MINIMUM ORGANIC MATTER CONTENT OF 10% DRY WEIGHT IN BEDS, AND 5% ORGANIC MATTER CONTENT IN
TURF AREAS, AND A PH FROM 6.0 TO 8.0 OR MATCHING THE PH OF THE UNDISTURBED SOIL. THE TOPSOIL LAYER SHALL HAVE A MINIMUM
DEPTH OF EIGHT INCHES EXCEPT WHERE TREE ROOTS LIMIT THE DEPTH OF INCORPORATION OF AMENDMENTS NEEDED TO MEET THE
CRITERIA. SUBSOILS BELOW THE TOPSOIL LAYER SHOULD BE SCARIFIED AT LEAST 4 INCHES WITH SOME INCORPORATION OF THE
UPPER MATERIAL TO AVOID STRATIFIED LAYERS, WHERE FEASIBLE.
2. MULCH PLANTING BEDS WITH 2 INCHES OF ORGANIC MATERIAL
3. USE COMPOST AND OTHER MATERIALS THAT MEET THESE ORGANIC CONTENT REQUIREMENTS:
3.a. THE ORGANIC CONTENT FOR "PRE -APPROVED" AMENDMENT RATES CAN BE MET ONLY USING COMPOST MEETING THE COMPOST
SPECIFICATION FOR BIORETENTION (REFER TO SECTION C.2.6) WITH THE EXCEPTION THAT THE COMPOST MAY HAVE UP TO 35%
BIOSOLIDS OR MANURE. THE COMPOST MUST ALSO HAVE AN ORGANIC MATTER CONTENT OF 40% TO 65%, AND A CARBON TO
NITROGEN RATIO BELOW 25:1. THE CARBON TO NITROGEN RATIO MAY BE AS HIGH AS 35:1 FOR PLANTINGS COMPOSED ENTIRELY
OF PLANTS NATIVE TO THE PUGET SOUND LOWLANDS REGION.
3.b. CALCULATED AMENDMENT RATES MAY BE MET THROUGH USE OF COMPOSTED MATERIAL MEETING "A)" ABOVE; OR OTHER
ORGANIC MATERIALS AMENDED TO MEET THE CARBON TO NITROGEN RATIO REQUIREMENTS, AND NOT EXCEEDING THE LIMITS
IDENTIFIED IN TABLE 220-B, TESTING PARAMETERS, IN WAC 173-350-220.
4. THE RESULTING SOIL SHOULD BE CONDUCIVE TO THE TYPE OF VEGETATION TO BE ESTABLISHED.
• IMPLEMENTATION OPTIONS: THE SOIL QUALITY DESIGN GUIDELINES LISTED ABOVE CAN BE MET BY USING ONE OF THE METHODS LISTED
BELOW:
1. LEAVE UNDISTURBED NATIVE VEGETATION AND SOIL, AND PROTECT FROM COMPACTION DURING CONSTRUCTION.
2. AMEND EXISTING SITE TOPSOIL OR SUBSOIL EITHER AT DEFAULT "PRE -APPROVED" RATES, OR AT CUSTOM CALCULATED RATES BASED
ON TESTS OF THE SOIL AND AMENDMENT.
3. STOCKPILE EXISTING TOPSOIL DURING GRADING, AND REPLACE IT PRIOR TO PLANTING.
4. STOCKPILED TOPSOIL MUST ALSO BE AMENDED IF NEEDED TO MEET THE ORGANIC MATTER OR DEPTH REQUIREMENTS, EITHER AT A
DEFAULT "PRE -APPROVED" RATE OR AT A CUSTOM CALCULATED RATE.
5. IMPORT TOPSOIL MIX OF SUFFICIENT ORGANIC CONTENT AND DEPTH TO MEET THE REQUIREMENTS. MORE THAN ONE METHOD MAY BE
USED ON DIFFERENT PORTIONS OF THE SAME SITE. SOIL THAT ALREADY MEETS THE DEPTH AND ORGANIC MATTER QUALITY
STANDARDS, AND IS NOT COMPACTED DOES NOT NEED TO BE AMENDED.
00
co
Cfl
O
O
N
A,
U
T
T
O
O
O
i
Ln
N
a
J
N
rr
n
R-438825