16319_75th_Review_Checklist.xlsTESC List
Stormwater List
Complete
Incomplete
Comments
(For New Developments with > 5,000 sq ft of new impervious surface)
Stormwater Management Review Checklist
(A)
(B)
Identify slope, length, diameter & matrerial for all pipes
(C)
(D)
(E)
Catch Basin, invert elevations for all pipes
(F)
(G)
Profile storm system and show utility crossings
Label and clearly identify existing & proposed systems
(H)
Flow arrows as necessary
(I)
(J)
Other
Calculations
Project Overview Narrative
Description of predeveloped assumptions for site
Description of existing site (include area of site)
Description of post developed conditions of the site
Discuss disposition of storm water runoff before & after development
Provide map showing general location of the site & geographical features
Discuss offsite drainage impacts to the site & from the site
(K)
Description of Proposed Development
(I)
Description of Detention Requirements for Development
Description of Water Quality Requirements for Development
Predeveloped Condition Runoff Curve Number
Predeveloped Condition Time of Concentration
Post Developed Condition Runoff Control Number
Post Developed Condition Time of Concentration
Area Calculations
Predeveloped Condition Computer Model Results
Post Developed Condition Computer Model Results
Sub basin routing
Detention system assumptions
Detention system routing computer model results
Water Quality Storm Calculations
(L)
Downspouts; provide connection (w/ adequate depth) to retention
Pipe slope info versus inverts @CBs and existing pipe info
Plan View- Drainage Conveyance
Plan View & Details- Retention/ Detention (R/D) & Water Quality
Scaled drawing of R/D pond, vault or pipe, including tract boundaries
Predeveloped & Finished Grade contours, show max water elev.
Dimension all berm widths (Ponds only)
Show 2 cross-sections through pond, 1 must show control structure
Specify soils and compaction requirements for pond construction
Location and detail of emergency overflow
Rock protection details
Access road to control manhole and pond bottoms, plan & details
Provide inverts of all pipes, grates, inlets, tanks, vaults & spot elev. of pond bottom
Section and plan view of control structure
Plan View: Other
Show location, identification and dimensions of buildings, property lines, streets, alleys & easements
Show locations of structures on abutting properties within 25 feet of proposed project site.
Show section details of all retaining walls & rockeries, sections through critical portions
`
Catch Basin size/type (check size based on depth, pipe size & angles)
X
N/A
By: Blaine Chesterfield On: 3-30-07
Address: 16319 75th Place W
Need an overview and description for the existing system. Explain in detail using the previous short plat calculations how this SFR's added impervious area will fit into the existing
system's remaining capacity. In other words is there enough leftover capacity to accommodate the additional impervious area.
New calculations may not be needed if the original calculations show that the existing detention system is sized to accommodate the proposed development. Calcs will be needed if the
system is undersized or no information on the existing detention system is shown.
Same as (A)
Show the invert elevation of the existing stub from the detention system.
Need cross section detail of the proposed rockery.
Erosion & Sedimentation Control Checklist
Will work entail,
Yes
No
a Grading Permit?
a Clearing Permit?
> 500 lineal feet of trench excavation?
work in a Critical area?
If all answers to 1 are no, ESC plan not required. Otherwise continue below.
A) Separate Plan depicting ESC devices
B) Limits of disturbed area
C) Perimeter control, protection of adjacent areas
D) Existing & Proposed Contours
E) Location of construction entrance and detail
F) Identify Drainage features, streams, wetlands,seeps, swales, etc
G) Show cut & fill slopes, indicating top/bottom of slope/catch lines
H) Conveyance System
1) Locate drainage pipes, ditches, swales, cut-off trenches
2) Temporary Pipe Inverts, or minimum slope & cover
3) Grades, dimensions, location, flow direction for ditches/swales
4) Bypass details for off-site runoff
5) Locations and outlets for Dewatering systems
J) Provide ESC notes
1) Stabilization of exposed areas (verbatim by code)
2) Other measures as needed to limit sediment impacts
3) Inspection & Maintenance of ESC devices & CBs
4) Seeding, mulching, matting requirements
5) Stockpiling location & protection
6) Street sweeping
7) Construction access
8) Vehicle cleaning to prevent tracking
9) Dust Control
10) Other
K) Construction Sequence
1) Preconstruction Meeting
2) Call for Utility Locations
3) Review ESC notes
4) Flag Clearing Limits
5) Installation of ESC devices
6) CB protection
7) Grading Activities
8) Reference stabilization of exposed area requirements
9) Utility Activities
10) Removal of ESC devices only after Stabilization
11) Other
L) Other
Land disturbing activities greater than 1 acre?
X
If all answer is no, end of checklist. Otherwise continue below.
Sediment Trapping
1) Sized per DOE or King County SWM manual
2) Berm Width and Slope inside & outside slopes
3) Storage info., depth, length, width
4) Conveyance to Trapping Facility
5) Typical Section View
6) Typ. details of gravel cone, standpipe, filtering devices
7) Detail control/restrictor device location & details
8) Mulch and/or cover of berms and slopes
9) Rock check dams, spacing, sections
10) Stabilization techniques
Put all ESC components on the a single sheet or two. Do not mix with other components of the plan.
Identify the seepages an swale on the east side of the property.
Flow direction of the swale along the east side of the property.
Provide TESC Notes from city codes 18.30.050
Need to add installation note.
1.00
2.00
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1.00
2.00
3.00
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5.00